Spontaneous respiratory effort during mechanical ventilation has long been recognized to improve oxygenation (1, 2), and
|
|
- Annabelle Brooks
- 5 years ago
- Views:
Transcription
1 Abstract Spontaneous respiratory effort during mechanical ventilation has long been recognized to improve oxygenation, and because oxygenation is a key management target, such effort may seem beneficial. Also, disuse and loss of peripheral muscle and diaphragm function is increasingly recognized, and thus spontaneous breathing may confer additional advantage. Reflecting this, epidemiologic data suggest that the use of partial (vs. full) support modes of ventilation is increasing. Notwithstanding the central place of spontaneous breathing in mechanical ventilation, accumulating evidence indicates that it may cause or worsen acute lung injury, especially if acute respiratory distress syndrome is severe and spontaneous effort is vigorous. This Perspective reviews the evidence for this phenomenon, explores mechanisms of injury, and provides suggestions for clinical management and future research. Keywords: mechanical ventilation; acute respiratory distress syndrome; spontaneous breathing; ventilator-induced lung injury Spontaneous respiratory effort during mechanical ventilation has long been recognized to improve oxygenation (1, 2), and because oxygenation is a key management target, such effort may seem beneficial. Also, disuse and loss of peripheral muscle and diaphragm function is increasingly recognized (3), and thus spontaneous breathing may confer additional advantage. Of course, all patients will need to transition to spontaneous effort if they are to become independent of the ventilator. Finally, epidemiologic data suggest that the use of partial (vs. full) support modes of ventilation reflecting more overall patient effort is increasing (4). Notwithstanding the central place of spontaneous breathing in mechanical ventilation, accumulating evidence indicates that this may cause or worsen acute lung injury, especially if acute respiratory distress syndrome (ARDS) is severe (5 11). This Perspective reviews the evidence for this phenomenon, explores mechanisms of injury, and provides suggestions for clinical management and future research. Spontaneous Breathing Causes Injury during Mechanical Ventilation The most direct evidence comes from experimental studies. In mechanically ventilated rabbits with established lung injury, vigorous spontaneous effort did not change plateau pressure (Pplat) but did worsen injury (8, 9). In a clinical study, strong spontaneous effort can injure not only the injured lung but also the diaphragm (12). Data from three randomized trials support this concept in demonstrating that neuromuscular blockade (to prevent spontaneous effort) results in improved lung function, and increased survival in severe ARDS (13 15). In the largest study (340 patients), early use of neuromuscular blockade in severe ARDS reduced barotrauma (4 vs. 11.7%) and mortality at 90 days (30.8 vs. 44.6%) (15). In addition, mortality in ventilated patients with severe sepsis was up to 12% lower among those who received neuromuscular blockade in the first two hospital days (16). Finally, individual case reports suggest that in pressure-targeted ventilation, spontaneous breathing will increase Vt and can be associated with barotrauma (10, 11). How Does a Spontaneous Breath Combine with a Ventilator Breath? The lung tissue stress during a tidal inhalation is the pressure distending the lung, or the transpulmonary pressure (PL) (17), that is, the difference between the airway pressure (Paw) and the pleural pressure (Ppl): PL = Paw Ppl. In positive-pressure ventilation under muscle paralysis, Paw constitutes the bulk of PL (Ppl is a minor contributor) unless chest wall compliance is seriously impaired (17, 18), and at end-inspiration is termed Pplat (19). Also, Pplat is readily recorded, whereas Ppl is not; thus, Pplat is the common indicator of inspiratory lung stress during mechanical ventilation (19). This is sufficiently accurate where changes in Ppl are minor under passive conditions; however, when spontaneous effort occurs during positivepressure ventilation, Pplat no longer approximates to PL, and because negative changes in Ppl are far greater with spontaneous effort, the risk of lung injury is increased (8, 9). Several lines of evidence support this reasoning. Although the PL (i.e., Paw Ppl) is the static pressure that holds the lung at any volume, its nature is better understood by decomposing Ppl into two parts: static and dynamic. Paw is zero (atmospheric) during spontaneous ventilation, and has a positive value during mechanical ventilation. However, Ppl is either static (e.g., at end-expiration) or dynamic (the magnitude of its change during inspiration). In the supine position, the static value of Ppl varies according to the vertical height (more negative, nondependent; more positive, dependent), and this is determined by the interaction between the shape of the lung
2 and the (slightly different) shape of the thorax, as well as by lung density and the weights of mediastinal and abdominal contents (20). A dynamic change in PL results from a change in Paw or a change in Ppl. Inspiration is driven by an increase in Paw (positive pressure) or a decrease in Ppl (spontaneous effort). In the healthy lung, changes in local Ppl, are evenly transmitted across the lung surface; this phenomenon is called fluid-like behavior (21, 22). Here, the change in PL is uniform, and therefore inflation is homogeneous across all lung regions (21, 22). This principle explains, in part, why the changes in esophageal pressure (Pes) are used as a surrogate of overall Ppl changes. In contrast, injured lungs exhibit solid-like behavior, where a nonaerated lung region impedes the rapid generalization of a local change in PL; in such cases, the lung expansion is heterogeneous (7). Superimposing a spontaneous effort onto a ventilator breath has an additive effect on the distending PL and therefore on the resulting Vt (Figure 1). Figure 1.Spontaneous effort and transpulmonary and transvascular pressures. During a mechanical breath (left), the transpulmonary pressure (Paw Ppl = PL) distending the lung is +20 (30 10); the pulmonary blood vessels are compressed by the positive-pressure breath and the transvascular pressure (Pcap Ppl) is low (assume = 2). When spontaneous effort is added (right), the PL ( = +50) is greater, thereby increasing the Vt and causing lung injury. In addition, the negative Ppl ( 20) distends the pulmonary blood vessels and increases perfusion; the transvascular pressure is greater (assume 8 20 = +28), increasing fluid shift to the interstitium. In the presence of injury, permeability (and therefore propensity to alveolar edema) is increased. Paw = airway pressure; Pcap = capillary hydrostatic pressure; Ppl = pleural pressure. [More] Mechanisms of Injury from Spontaneous Breathing There are several mechanisms whereby spontaneous breathing during mechanical ventilation may worsen lung injury. Distending Pressure and Tidal Volumes Spontaneous effort during a ventilator breath reduces Ppl and increases PL (Figure 1), and if the mechanical properties of respiratory system have not changed, the resulting Vt will be increased proportionally (17, 23); this may contribute to lung injury (10, 11). However, the increase in Vt may be less than predicted from the change in PL. There are several reasons for this discrepancy. First, if spontaneous effort causes pendelluft (see below), the local inflation is facilitated by corresponding deflation of aerated (nondependent) lung, without a significant increase in overall Vt (6, 7). Second, intrinsic positive endexpiratory pressure (PEEP) associated with high respiratory drive can lower Vt (23). Third, PL has two components: resistive (generates airflow) and transalveolar (expands alveoli). If PL measured during spontaneous breathing includes the resistive pressure due to flow (e.g., incomplete inspiration) and the resistive component of PL is high (e.g., status asthmaticus), an elevated PL would inflate the alveoli less than predicted from the PL, and the net Vt will thus be lower than predicted. However, airway (inspiratory) resistance is rarely increased in ARDS (24). Finally, if spontaneous effort worsens lung injury over time, the compliance will progressively lessen and the Vt will be less for a given PL (8, 9). Pendelluft The exchange of air from one lung region to another without causing a significant change in overall Vt (i.e., pendelluft), has been observed with spontaneous breaths during mechanical ventilation. Although first observed in a patient with ARDS, the mechanisms and characteristics have been determined in a large-animal (pig) model (6, 7). The rapid tissue deformation results in tidal recruitment and local overstretch of the involved dependent region, as well as rapid deflation (followed by reinflation) of the corresponding nondependent region. This phenomenon occurs because the negative Ppl changes generated by diaphragmatic contraction have localized effects in dependent regions, and the Ppl changes are not uniformly transmitted (i.e., solid-like behavior) (Figure 2). Thus a large vertical pressure gradient of Ppl swings from nondependent (less negative) to dependent (more negative) regions causes pendelluft. Although pendelluft has not been proved to cause injury, the rapid inflation deflation is an injurious pattern. Figure 2.Spontaneous effort and distribution of regional ventilation and pleural pressure. Dynamic computed tomographic scan in endexpiration (left) demonstrates that the aerated lung (blue) is nondependent, while the dependent lung is densely atelectatic (red). At endinspiration during a spontaneous breath (middle), there is little change in the nondependent aerated lung (blue); the dependent lung, previously densely atelectatic (red), is now partially aerated (green/red) (i.e., tidal recruitment). The inspiratory pleural pressure traces (right), measured at the arrow tips, show the negative deflections ( swings ) in regional Ppl and global Pes during inspiration. However, the swing in regional Ppl is greater (by twofold) than the swing in Pes, indicating that diaphragm contraction results in greater distending pressure applied to the regional lung near the diaphragm, compared with the pressure transmitted to the remainder of the lung (i.e., Pes). A = anterior; HU = Hounsfield units; I = inferior; L = left; P = posterior; Pes = esophageal pressure; Ppl = pleural pressure; R = right. [More] Increased Lung Perfusion Spontaneous effort generates a more negative Ppl, which in turn increases transvascular pressure (difference between intravascular pressure and pressure outside the vessels); this distends thoracic and pulmonary vessels, and increases lung
3 perfusion (25, 26); in injured lungs it may cause edema (27). Clinical data indicate that inspiratory effort in the setting of volume-controlled ventilation (27) or upper airway obstruction (28) (i.e., no change in Vt or PL) can result in elevated transvascular pressure, thereby increasing perfusion and propensity to edema. Finally, because pulmonary edema can reduce lung compliance and increase the heterogeneity of ventilation, it can ultimately contribute to injury (29). Patient Ventilator Asynchrony Asynchrony between the patient s (spontaneous) effort and the ventilator can worsen lung injury. Double triggering is the occurrence of two consecutive inspirations after a single respiratory effort (30), and is injurious because the delivered (total) Vt is the sum of the two consecutive tidal volumes (Figure 3). Double triggering may be common (sometimes more than twice per minute) when a protective lung strategy in ARDS is facilitated by heavy sedation, and may lead to higher Vt (>150% preset Vt) (30, 31). Second, in heavily sedated patients reverse triggering (entrainment) can occur, in which the diaphragm is triggered by ventilator-driven inspiration (32). Although the mechanism of initiation is unclear, the phenomenon is identified by a slight decrease in Paw and Pes (corresponding to increased PL), and an increase in delivered Vt. The increases in PL and Vt are potentially harmful. Finally, as noted previously, inability of the patient to receive the desired Vt can result in more negative Ppl, contributing to edema and injury (see above) (27). Figure 3.Impact of double triggering on tidal volume. Double triggering occurs when a spontaneous effort triggers a (second) ventilator breath before the initial breath has been completely exhaled (arrow). The pressure time trace (top) and flow time trace (middle) demonstrate the occurrence of the additional breath but do not give a sense that both inspirations are summed; this is apparent from the volume time trace (bottom) indicating that the double triggering results in a substantially larger (potentially injurious) Vt (red) compared with regular triggering (blue). Adapted by permission from Reference 56. [More] The adverse impact of these (and other) patient ventilator asynchronies is increasingly recognized, and data from 50 ventilated patients suggest an association between increased incidence of asynchrony and higher mortality (33). Spontaneous Effort: Expiration Spontaneous effort activates expiratory (as well as inspiratory) muscles. Forced expiration shifts the diaphragm cephalad and lowers the end-expiratory lung volume; this leads to hypoxemia, and may necessitate more injurious ventilator settings (5, 34). Opioids frequently used in patients with ARDS with preserved spontaneous effort may potentially facilitate this phenomenon by increasing abdominal muscle tone (35). Lower lung volume also increases the intrinsic risk of lung injury (36), and because the volume of aerated lung is reduced (35), will increase the injury caused by a given Vt. Risk Factors for Injury Severity of ARDS Spontaneous effort added to mechanical ventilation in established experimental lung injury significantly worsens the injury if severe to begin with (8, 9); however, in mild lung injury, spontaneous effort improves function (e.g., gas exchange, lung compliance, aeration), but does not worsen injury (2, 9, 37). This pattern of susceptibility is reflected in clinical studies. In the major clinical trial examining the impact of early neuromuscular blockade in ARDS, only patients with severe disease (Pa O2 /Fi O2 < 150 mm Hg) were recruited (15); by contrast, enrollment in most trials in ARDS specifies a lesser degree of hypoxemia (Pa O2 /Fi O2 < 300 mm Hg) (38). Although the unadjusted analysis suggested benefit from neuromuscular blockade, this was significant in patients with severe disease (Pa O2 /Fi O2 < 120 mm Hg), in whom survival was increased by 13.8% (15). Of course, increased severity of ARDS is inherently linked to greater loss of lung volume, more injurious ventilator settings (Paw), and increased respiratory drive (and effort); these issues are considered individually. Loss of Lung Volume Loss of aerated lung volume has two principal effects: less lung available for tidal distension and increased force of diaphragmatic contraction. For any given Vt (or Paw), a lung with lower end-expiratory volume is inherently more susceptible to injury from tidal inflation (36, 39). With mechanical breaths, this is distributed to (and overstretches) already aerated regions (e.g., the baby lung) (40); in contrast, a spontaneous breath appears to be distributed mostly to zones of atelectatic lung, resulting in transient ( tidal ) recruitment and local volutrauma in the dependent lung (6, 7) (Figure 2). Reduced lung volume has important effects on diaphragm position and function. Cephalad displacement results in greater curvature of the diaphragm and an increase in the size of the zone of apposition (41). In addition, diaphragm fibers are lengthened, augmenting its force of contraction; this results in more negative Ppl changes to the lung surface, and it increases the positive appositional pressure to the abdominal rib cage (6, 41). Increased Respiratory Drive Greater respiratory drive is caused by several factors including hypercapnia, acidemia, hypoxemia, pain, fever, and
4 pulmonary and systemic inflammation all of which are common in ARDS, and to a greater extent in more severe disease. If respiratory neuromuscular function is intact, then increased drive translates into stronger diaphragm contraction and larger swings of Ppl. This has been demonstrated in laboratory studies, in which spontaneous effort (and negative deflections in Pes) was greater in more severe lung injury (9). Stronger spontaneous effort is linearly related to larger degrees of pendelluft, as well as greater tidal recruitment and local volutrauma (6, 7). In addition, strong spontaneous effort can injure not only the injured lung but also the diaphragm (12). Enhanced respiratory drive also impacts on patient ventilator interaction. For example, double triggering (breath stacking) is more frequent in patients with higher respiratory drive (42); thus, in more severe disease tidal volumes significantly larger than intended may be delivered. It is possible (although not proven) that increased respiratory drive explains in part why spontaneous ventilation worsens injury in severe (but not mild) ARDS, because the increased drive results in greater swings in Ppl and these occur at a higher rate. Injurious Ventilator Settings Mechanical ventilation in more severe ARDS usually provides higher Pplat and driving pressure (43), and this is probably due to lower respiratory system compliance. When spontaneous effort is added to a higher Pplat, the resultant PL would be injuriously high, reflecting the higher Pplat plus the added negative Ppl (9). Driving pressure predicts survival in ARDS, but the initial analysis excluded patients with spontaneous effort (18). Conventional calculation of driving pressure takes into account measurement of (positive) airway pressures only (i.e., Pplat PEEP), and not any contribution from Ppl. However, in the presence of spontaneous effort, two different types of pressure are combined to inflate the respiratory system: positive airway pressure (i.e., Pplat PEEP) applied by the ventilator, and the negative change in Ppl generated by respiratory muscles. In this case, the true driving pressure across the respiratory system should be calculated as Pplat PEEP + ΔPpl; thus spontaneous effort preserved in severe ARDS would increase considerably the true driving pressure (9), especially if spontaneous effort is prolonged. Conventional calculation of driving pressure (using an end-inspiratory hold) can be accurately performed provided spontaneous effort has ended before the end of inspiration, and muscle relaxation has occurred (44). It is likely that higher driving pressure due to added spontaneous effort will be associated with greater injury. In severe ARDS, Pplat may remain elevated (e.g., >30 cm H 2 O) even after the reduction of Vt to low levels (e.g., 4 ml kg 1 ); in such cases, decreasing PEEP to lower Pplat (15), this may increase spontaneous effort and driving pressure, and with spontaneous breathing, may also increase the severity of pendelluft (6). Benefits of Spontaneous Effort Added to Mechanical Ventilation Spontaneous breathing during mechanical ventilation has been recommended for more than four decades because of important short-term benefits (1, 2, 45). Diaphragm Muscle Tone Controlled mechanical ventilation (i.e., no spontaneous breathing) induces diaphragmatic muscle dysfunction and atrophy (3). This is a serious problem, especially for subsequent weaning; it is detectable in patients within as little as 18 hours (3), and can be ameliorated by preservation of spontaneous effort (46). Cardiovascular Effects Whereas positive-pressure ventilation reduces transvascular pressure and ventricular preload (elevated intrathoracic pressure) (47), as well as reducing ventricular afterload, spontaneous respiration does the opposite. Increased preload and afterload might reduce cardiac output where ventricular function is impaired; this may be important in ARDS where impaired right ventricular function is present in 30% of patients (48). The net effect of spontaneous effort on cardiac output reflects a balance of intrathoracic pressure, baseline ventricular filling, and the ventricular contractile function. Pulmonary Function Spontaneous breathing increases aeration in dependent lung (37), as well as increasing lung perfusion (see below) (49). Thus intrapulmonary shunt is reduced and V.V./Q.Q. matching and oxygenation increased (1, 2, 49). Indeed, spontaneous breathing is considered to be the least invasive means to maintain lung recruitment (5). Although diaphragm movement effectively recruits the lungs, diaphragmatic tone is also important. Continuous phrenic nerve stimulation during general anesthesia (i.e., deep sedation, healthy lungs) lessens the development of atelectasis because transmission of abdominal pressure to the pleural space is impeded by the increased diaphragmatic tone (50). Benefit from addition of spontaneous breathing has been described in several clinical and laboratory studies, where improved oxygenation is consistently reported; however, in each of these studies the lung injury was mild (modest impairment of oxygenation, low Paw) (1, 2, 9, 37, 49). These data may be the basis for recommendations to preserve
5 spontaneous breathing in patients with mild ARDS (45). Outcome In addition to reports of physiological benefit associated with spontaneous ventilation, Putensen and colleagues reported reduced length of intensive care unit stay (2). However, experimental and clinical data suggest a common theme. In severe ARDS, avoidance of spontaneous effort reduces injury (9) and improves outcome (15). By contrast, in milder disease, the presence of spontaneous effort has little impact on outcome, but may prevent worsening of lung injury, improve pulmonary function (1, 2, 9, 37, 49), and in some patients, reduce duration of mechanical ventilation (2). Detection of Spontaneous Effort Spontaneous effort is usually apparent by observing spontaneous breaths (i.e., chest movement or ventilator waveforms) that are out of sequence with the ventilator breaths. In addition to the timing, it is usually possible to observe the patient effort, which is apparent from accessory muscle use. Although indirect, additional signs of respiratory distress, such as anxiety or nasal flaring, indicate a high likelihood of independent respiratory effort. Standard ventilator monitoring will confirm increased respiratory rate (above the ventilator set rate), and demonstrate negative deflection in Paw at the start of inspiration, as well as higher minute ventilation, Vt, and inspiratory flow. It will help us to evaluate whether respiratory drive is vigorous over the appropriate range (e.g., respiratory rate > 35 breaths/min, Vt > 8 ml/kg). Importantly, airway occlusion pressure (i.e., P0.1) can represent a more precise respiratory drive measurement than respiratory rate, Vt, and minute ventilation (51). A high value of P0.1 was observed in the early stage of acute respiratory failure as reflecting vigorous spontaneous effort, but its value decreased as conditions of patients improved (52). Such standard ventilator monitoring is helpful to detect high respiratory drive and, if necessary, further monitoring including esophageal balloon manometry or electrical impedance topography (EIT) will be considered to evaluate PL or ventilation pattern. Thus, detection of spontaneous effort is usually straightforward. However, three aspects of spontaneous breathing during mechanical ventilation might not be appreciated. First, Pes, which is considered to reflect changes in overall Ppl, might not reliably detect changes in regional Ppl in the injured lung. Because atelectatic or consolidated lung regions are solid-like, they poorly transmit dynamic regional changes in Ppl and changes in local Ppl at dependent lung might be underestimated by changes in Pes (7). Thus, esophageal manometry may underestimate spontaneous effort if the lung overlying the diaphragm is densely consolidated or atelectatic (Figure 2). Second, spontaneous breathing often leads to better oxygenation, and this may be interpreted by the clinician as an improvement in the patient s status rather than recognized as a potential contributor to worsening lung injury (i.e., tidal recruitment and local volutrauma in the dependent lung). Third, pendelluft cannot be detected by standard monitoring of airway flow, Paw, or Pes, and can be reliably detected only by EIT (accessible) or dynamic CT (less accessible). Approach to Management Minimize Spontaneous Effort The definitive way to prevent harm from spontaneous effort is to use neuromuscular blockade. Papazian and colleagues demonstrated that early (and short-term) use of neuromuscular blockade reduced mortality and barotrauma in severe ARDS (15). Because most physiological parameters were similar in both groups, the presence of spontaneous effort seems to have been responsible for the difference in outcome (i.e., lung injury); however, the specific mechanism is uncertain. When using neuromuscular blockade it is important to avoid awareness, provide sufficient analgesia, and detect and manage potentially lethal causes of dyspnea (e.g., endotracheal tube displacement). Providing adequate sedation and analgesia (and perhaps buffering acidosis) may reduce breathing effort; indeed, spontaneous effort can be successfully reduced by maintaining normal Pa CO2 during extracorporeal support (53). In addition, because increased lung volume flattens the curvature of the diaphragm, the diaphragmatic fiber length is lessened and its force of contraction reduced (41). Thus, optimal recruitment may reduce spontaneous effort and lessen pendelluft (6). Tidal Volume Limitation of Vt might reduce effort-associated lung injury, but this is difficult to accomplish where spontaneous effort is vigorous, especially with pressure-preset modes. If respiratory effort is great, restriction to a small Vt by means of volumecontrolled ventilation can cause the patient to develop highly negative Ppl with forced inspiration, and this can contribute to increased pulmonary edema (see above) and increased frequency of double triggering (27, 30, 31). Limitation of Vt might fail to protect for additional reasons. A ventilator breath is introduced through already aerated lung, thus inflating already aerated lung and the atelactatic lung that borders the aerated lung. In contrast, a spontaneous effort may be introduced largely through atelectatic lung; because this exhibits solid-like behavior, the impact of the diaphragmatic effort may be in part restricted to this atelectatic lung, causing pendelluft and contributing less to the overall Vt (Figure 2). However, the usefulness of Vt limitation during spontaneous effort is unproven. Ventilator Mode
6 First, in patient ventilator asynchrony, double triggering is frequently observed during volume-controlled ventilation (30, 31). Switching to ventilator mode with better patient ventilator interaction such as pressure support may better reduce the frequency of double triggering than increasing sedatives and analgesia (31). Thus, it is important to adapt the ventilator mode to patients to decrease patient ventilator asynchrony. Second, the presence of spontaneous effort while using inspiratory synchronization (e.g., assist-control, pressure support), is likely to cause high PL because each spontaneous breath will initiate and augment the corresponding positive pressure from the ventilator. In contrast, during nonsynchronized ventilation (e.g., airway pressure release ventilation), a spontaneous breath will infrequently combine with a ventilator breath; when not combined (the usual case), the ventilator and spontaneous volumes are not added and the Vt or PL therefore is not increased (54). However, use of nonsynchronized modes has not been associated with improved outcome (55). Optimal Lung Recruitment Lung recruitment and maintenance with adequate PEEP increases compliance, thereby lessening driving pressure for a given Vt. Moreover, optimal lung recruitment can reduce the intensity of respiratory drive (as reflected in reduced negative swings in Pes) (6). Recruitment also lessens the degree of solid-like behavior of the lung, and could mitigate injury from spontaneous effort because solid-like behavior contributes to inhomogeneous inflation, and causes underestimation by Pes of swings in Ppl and development of pendelluft (7). Theoretically, optimal recruitment could facilitate benefit from spontaneous breathing (e.g., preservation of muscle tone, less sedation or paralysis), while minimizing injury. Conclusions There are protective and deleterious consequences of spontaneous breathing during mechanical ventilation in ARDS. Accumulating evidence has revealed that the net impact depends on the severity of lung injury. Ventilator strategies allowing spontaneous breathing and mechanical ventilation with muscle paralysis during ARDS should both be integrated into management strategies. Restoration of ventilated fluid-like lung may be key to preventing the deleterious effects of spontaneous breathing and to render Pes a more accurate reflector of local lung stress. References 1. Stock MC, Downs JB, Frolicher DA. Airway pressure release ventilation. Crit Care Med1987;15: Putensen C, Zech S, Wrigge H, Zinserling J, Stüber F, Von Spiegel T, Mutz N. Long-term effects of spontaneous breathing during ventilatory support in patients with acute lung injury. Am J Respir Crit Care Med 2001;164: Levine S, Nguyen T, Taylor N, Friscia ME, Budak MT, Rothenberg P, Zhu J, Sachdeva R, Sonnad S, Kaiser LR, et al. Rapid disuse atrophy of diaphragm fibers in mechanically ventilated humans. N Engl J Med 2008;358: Esteban A, Frutos-Vivar F, Muriel A, Ferguson ND, Peñuelas O, Abraira V, Raymondos K, Rios F, Nin N, Apezteguía C, et al. Evolution of mortality over time in patients receiving mechanical ventilation. Am J Respir Crit Care Med 2013;188: Marini JJ. Spontaneously regulated vs. controlled ventilation of acute lung injury/acute respiratory distress syndrome. Curr Opin Crit Care 2011;17: Yoshida T, Roldan R, Beraldo MA, Torsani V, Gomes S, De Santis RR, Costa EL, Tucci MR, Lima RG, Kavanagh BP, et al. Spontaneous effort during mechanical ventilation: maximal injury with less positive end-expiratory pressure. Crit Care Med 2016;44:e678 e Yoshida T, Torsani V, Gomes S, De Santis RR, Beraldo MA, Costa EL, Tucci MR, Zin WA, Kavanagh BP, Amato MB. Spontaneous effort causes occult pendelluft during mechanical ventilation. Am J Respir Crit Care Med 2013;188:
7 8. Yoshida T, Uchiyama A, Matsuura N, Mashimo T, Fujino Y. Spontaneous breathing during lung-protective ventilation in an experimental acute lung injury model: high transpulmonary pressure associated with strong spontaneous breathing effort may worsen lung injury. Crit Care Med2012;40: Yoshida T, Uchiyama A, Matsuura N, Mashimo T, Fujino Y. The comparison of spontaneous breathing and muscle paralysis in two different severities of experimental lung injury. Crit Care Med 2013;41: Leray V, Bourdin G, Flandreau G, Bayle F, Wallet F, Richard JC, Guérin C. A case of pneumomediastinum in a patient with acute respiratory distress syndrome on pressure support ventilation. Respir Care 2010;55: Medline 11. Sasidhar M, Chatburn RL. Tidal volume variability during airway pressure release ventilation: case summary and theoretical analysis. Respir Care 2012;57: Goligher EC, Fan E, Herridge MS, Murray A, Vorona S, Brace D, Rittayamai N, Lanys A, Tomlinson G, Singh JM, et al. Evolution of diaphragm thickness during mechanical ventilation: impact of inspiratory effort. Am J Respir Crit Care Med 2015;192: Gainnier M, Roch A, Forel JM, Thirion X, Arnal JM, Donati S, Papazian L. Effect of neuromuscular blocking agents on gas exchange in patients presenting with acute respiratory distress syndrome. Crit Care Med 2004;32: Forel JM, Roch A, Marin V, Michelet P, Demory D, Blache JL, Perrin G, Gainnier M, Bongrand P, Papazian L. Neuromuscular blocking agents decrease inflammatory response in patients presenting with acute respiratory distress syndrome. Crit Care Med 2006;34: Papazian L, Forel JM, Gacouin A, Penot-Ragon C, Perrin G, Loundou A, Jaber S, Arnal JM, Perez D, Seghboyan JM, et al.; ACURASYS Study Investigators. Neuromuscular blockers in early acute respiratory distress syndrome. N Engl J Med 2010;363: Steingrub JS, Lagu T, Rothberg MB, Nathanson BH, Raghunathan K, Lindenauer PK. Treatment with neuromuscular blocking agents and the risk of in-hospital mortality among mechanically ventilated patients with severe sepsis. Crit Care Med 2014;42: Akoumianaki E, Maggiore SM, Valenza F, Bellani G, Jubran A, Loring SH, Pelosi P, Talmor D, Grasso S, Chiumello D, et al.; PLUG Working Group (Acute Respiratory Failure Section of the European Society of Intensive Care Medicine). The application of esophageal pressure measurement in patients with respiratory failure. Am J Respir Crit Care Med 2014;189: Amato MB, Meade MO, Slutsky AS, Brochard L, Costa EL, Schoenfeld DA, Stewart TE, Briel M, Talmor D, Mercat A, et al. Driving pressure and survival in the acute respiratory distress syndrome. N Engl J Med 2015;372: Slutsky AS. Mechanical ventilation: American College of Chest Physicians consensus conference. Chest 1993;104: Agostoni E. Mechanics of the pleural space. Physiol Rev 1972;52: Medline 21. D Angelo E, Agostoni E. Continuous recording of pleural surface pressure at various sites. Respir Physiol 1973;19:
8 22. Minh VD, Friedman PJ, Kurihara N, Moser KM. Ipsilateral transpulmonary pressures during unilateral electrophrenic respiration. J Appl Physiol 1974;37: Medline 23. Rittayamai N, Katsios CM, Beloncle F, Friedrich JO, Mancebo J, Brochard L. Pressure-controlled vs volume-controlled ventilation in acute respiratory failure: a physiology-based narrative and systematic review. Chest 2015;148: Pesenti A, Pelosi P, Rossi N, Virtuani A, Brazzi L, Rossi A. The effects of positive end-expiratory pressure on respiratory resistance in patients with the adult respiratory distress syndrome and in normal anesthetized subjects. Am Rev Respir Dis 1991;144: Mauri T, Yoshida T, Bellani G, Goligher EC, Carteaux G, Rittayamai N, Mojoli F, Chiumello D, Piquilloud L, Grasso S, et al.; PLeUral pressure working Group (PLUG Acute Respiratory Failure section of the European Society of Intensive Care Medicine). Esophageal and transpulmonary pressure in the clinical setting: meaning, usefulness and perspectives. Intensive Care Med2016;42: Eckstein JW, Hamilton WK. Changes in transmural central venous pressure in man during hyperventilation. J Clin Invest 1958;37: Kallet RH, Alonso JA, Luce JM, Matthay MA. Exacerbation of acute pulmonary edema during assisted mechanical ventilation using a lowtidal volume, lung-protective ventilator strategy. Chest 1999;116: Oswalt CE, Gates GA, Holmstrom MG. Pulmonary edema as a complication of acute airway obstruction. JAMA 1977;238: Perlman CE, Lederer DJ, Bhattacharya J. Micromechanics of alveolar edema. Am J Respir Cell Mol Biol 2011;44: Pohlman MC, McCallister KE, Schweickert WD, Pohlman AS, Nigos CP, Krishnan JA, Charbeneau JT, Gehlbach BK, Kress JP, Hall JB. Excessive tidal volume from breath stacking during lung-protective ventilation for acute lung injury. Crit Care Med 2008;36: Chanques G, Kress JP, Pohlman A, Patel S, Poston J, Jaber S, Hall JB. Impact of ventilator adjustment and sedation-analgesia practices on severe asynchrony in patients ventilated in assist-control mode. Crit Care Med 2013;41: Akoumianaki E, Lyazidi A, Rey N, Matamis D, Perez-Martinez N, Giraud R, Mancebo J, Brochard L, Marie Richard JC. Mechanical ventilation induced reverse-triggered breaths: a frequently unrecognized form of neuromechanical coupling. Chest 2013;143: Blanch L, Villagra A, Sales B, Montanya J, Lucangelo U, Luján M, García-Esquirol O, Chacón E, Estruga A, Oliva JC, et al. Asynchronies during mechanical ventilation are associated with mortality. Intensive Care Med 2015;41: Coggeshall JW, Marini JJ, Newman JH. Improved oxygenation after muscle relaxation in adult respiratory distress syndrome. Arch Intern Med 1985;145:
9 35. Kallos T, Wyche MQ, Garman JK. The effects of Innovar on functinal residual capacity and total chest compliance in man. Anesthesiology 1973;39: Gattinoni L, Pesenti A. The concept of baby lung. Intensive Care Med 2005;31: Wrigge H, Zinserling J, Neumann P, Defosse J, Magnusson A, Putensen C, Hedenstierna G. Spontaneous breathing improves lung aeration in oleic acid induced lung injury. Anesthesiology2003;99: Ranieri VM, Rubenfeld GD, Thompson BT, Ferguson ND, Caldwell E, Fan E, Camporota L, Slutsky AS; ARDS Definition Task Force. Acute respiratory distress syndrome: the Berlin Definition. JAMA2012;307: Terragni PP, Rosboch G, Tealdi A, Corno E, Menaldo E, Davini O, Gandini G, Herrmann P, Mascia L, Quintel M, et al. Tidal hyperinflation during low tidal volume ventilation in acute respiratory distress syndrome. Am J Respir Crit Care Med 2007;175: Tsuchida S, Engelberts D, Peltekova V, Hopkins N, Frndova H, Babyn P, McKerlie C, Post M, McLoughlin P, Kavanagh BP. Atelectasis causes alveolar injury in nonatelectatic lung regions. Am J Respir Crit Care Med 2006;174: Pengelly LD, Alderson AM, Milic-Emili J. Mechanics of the diaphragm. J Appl Physiol1971;30: Medline 42. Thille AW, Rodriguez P, Cabello B, Lellouche F, Brochard L. Patient ventilator asynchrony during assisted mechanical ventilation. Intensive Care Med 2006;32: Bellani G, Laffey JG, Pham T, Fan E, Brochard L, Esteban A, Gattinoni L, van Haren F, Larsson A, McAuley DF, et al.; LUNG SAFE Investigators; ESICM Trials Group. Epidemiology, patterns of care, and mortality for patients with acute respiratory distress syndrome in intensive care units in 50 countries. JAMA 2016;315: Bellani G, Grasselli G, Teggia-Droghi M, Mauri T, Coppadoro A, Brochard L, Pesenti A. Do spontaneous and mechanical breathing have similar effects on average transpulmonary and alveolar pressure? A clinical crossover study. Crit Care 2016;20: Güldner A, Pelosi P, Gama de Abreu M. Spontaneous breathing in mild and moderate versus severe acute respiratory distress syndrome. Curr Opin Crit Care 2014;20: Sassoon CS, Zhu E, Caiozzo VJ. Assist-control mechanical ventilation attenuates ventilator-induced diaphragmatic dysfunction. Am J Respir Crit Care Med 2004;170: Qvist J, Pontoppidan H, Wilson RS, Lowenstein E, Laver MB. Hemodynamic responses to mechanical ventilation with PEEP: the effect of hypervolemia. Anesthesiology 1975;42: Repessé X, Charron C, Vieillard-Baron A. Right ventricular failure in acute lung injury and acute respiratory distress syndrome. Minerva Anestesiol 2012;78:
10 Medline 49. Neumann P, Wrigge H, Zinserling J, Hinz J, Maripuu E, Andersson LG, Putensen C, Hedenstierna G. Spontaneous breathing affects the spatial ventilation and perfusion distribution during mechanical ventilatory support. Crit Care Med 2005;33: Hedenstierna G, Tokics L, Lundquist H, Andersson T, Strandberg A, Brismar B. Phrenic nerve stimulation during halothane anesthesia: effects of atelectasis. Anesthesiology 1994;80: Conti G, Antonelli M, Arzano S, Gasparetto A. Measurement of occlusion pressures in critically ill patients. Crit Care 1997;1: Herrera M, Blasco J, Venegas J, Barba R, Doblas A, Marquez E. Mouth occlusion pressure (P0.1) in acute respiratory failure. Intensive Care Med 1985;11: Mauri T, Grasselli G, Suriano G, Eronia N, Spadaro S, Turrini C, Patroniti N, Bellani G, Pesenti A. Control of respiratory drive and effort in extracorporeal membrane oxygenation patients recovering from severe acute respiratory distress syndrome. Anesthesiology 2016;125: Richard JC, Lyazidi A, Akoumianaki E, Mortaza S, Cordioli RL, Lefebvre JC, Rey N, Piquilloud L, Sferrazza Papa GF, Mercat A, et al. Potentially harmful effects of inspiratory synchronization during pressure preset ventilation. Intensive Care Med 2013;39: González M, Arroliga AC, Frutos-Vivar F, Raymondos K, Esteban A, Putensen C, Apezteguía C, Hurtado J, Desmery P, Tomicic V, et al. Airway pressure release ventilation versus assist-control ventilation: a comparative propensity score and international cohort study. Intensive Care Med2010;36: Robinson BR, Blakeman TC, Toth P, Hanseman DJ, Mueller E, Branson RD. Patient ventilator asynchrony in a traumatically injured population. Respir Care 2013;58: Correspondence and requests for reprints should be addressed to Brian P. Kavanagh, M.B., Department of Critical Care Medicine, Hospital for Sick Children, 500 University Avenue, Toronto, ON, M5G 1X8 Canada. brian.kavanagh@utoronto.ca
CRITICAL CARE PERSPECTIVE
FIFTY YEARS OF RESEARCH IN ARDS Spontaneous Breathing during Mechanical Ventilation Risks, Mechanisms, and Management Takeshi Yoshida 1,2,3,4, Yuji Fujino 4, Marcelo B. P. Amato 5, and Brian P. Kavanagh
More informationIncidence of dyssynchronous spontaneous Breathing Effort, breath-stacking and reverse triggering in early ARDS. - The BEARDS project -
Incidence of dyssynchronous spontaneous Breathing Effort, breath-stacking and reverse triggering in early ARDS - The BEARDS project - Scientific committee: Tai Pham Martin Dres Irene Telias Tommaso Mauri
More informationSpontaneous breathing: a double-edged sword to handle with care
Review Article Page 1 of 11 Spontaneous breathing: a double-edged sword to handle with care Tommaso Mauri 1,2, Barbara Cambiaghi 3, Elena Spinelli 2, Thomas Langer 1, Giacomo Grasselli 1,2 1 Department
More informationMonitoring Respiratory Drive and Respiratory Muscle Unloading during Mechanical Ventilation
Monitoring Respiratory Drive and Respiratory Muscle Unloading during Mechanical Ventilation J. Beck and C. Sinderby z Introduction Since Galen's description 2000 years ago that the lungs could be inflated
More informationHow ARDS should be treated in 2017
How ARDS should be treated in 2017 2017, Ostrava Luciano Gattinoni, MD, FRCP Georg-August-Universität Göttingen Germany ARDS 1. Keep the patient alive respiration circulation 2. Cure the disease leading
More informationProtective ventilation for ALL patients
Protective ventilation for ALL patients PAOLO PELOSI, MD, FERS Department of Surgical Sciences and Integrated Diagnostics (DISC), San Martino Policlinico Hospital IRCCS for Oncology, University of Genoa,
More informationVentilatory Management of ARDS. Alexei Ortiz Milan; MD, MSc
Ventilatory Management of ARDS Alexei Ortiz Milan; MD, MSc 2017 Outline Ventilatory management of ARDS Protected Ventilatory Strategy Use of NMB Selection of PEEP Driving pressure Lung Recruitment Prone
More informationTranspulmonary pressure measurement
White Paper Transpulmonary pressure measurement Benefit of measuring transpulmonary pressure in mechanically ventilated patients Dr. Jean-Michel Arnal, Senior Intensivist, Hopital Sainte Musse, Toulon,
More informationARDS Assisted ventilation and prone position. ICU Fellowship Training Radboudumc
ARDS Assisted ventilation and prone position ICU Fellowship Training Radboudumc Fig. 1 Physiological mechanisms controlling respiratory drive and clinical consequences of inappropriate respiratory drive
More informationPrepared by : Bayan Kaddourah RN,MHM. GICU Clinical Instructor
Mechanical Ventilation Prepared by : Bayan Kaddourah RN,MHM. GICU Clinical Instructor 1 Definition Is a supportive therapy to facilitate gas exchange. Most ventilatory support requires an artificial airway.
More informationMechanical Ventilation in Adults with Acute Respiratory Distress Syndrome Summary of the Experimental Evidence for the Clinical Practice Guideline
Mechanical Ventilation in Adults with Acute Respiratory Distress Syndrome Summary of the Experimental Evidence for the Clinical Practice Guideline Lorenzo Del Sorbo 1, Ewan C. Goligher 1, Daniel F. McAuley
More informationVentilator Waveforms: Interpretation
Ventilator Waveforms: Interpretation Albert L. Rafanan, MD, FPCCP Pulmonary, Critical Care and Sleep Medicine Chong Hua Hospital, Cebu City Types of Waveforms Scalars are waveform representations of pressure,
More informationHow to improve patient-ventilator synchrony
White Paper How to improve patient-ventilator synchrony Waveform analysis and optimization of ventilator settings Anita Orlando, MD, Servizio di Anestesia e Rianimazione I, Fondazione IRCCS Policlinico
More informationInterpretation of the transpulmonary pressure in the critically ill patient
Review Article Page 1 of 12 Interpretation of the transpulmonary pressure in the critically ill patient Michele Umbrello 1, Davide Chiumello 1,2 1 UOC Anestesia e Rianimazione, Ospedale San Paolo ASST
More informationRecognizing and Correcting Patient-Ventilator Dysynchrony
2019 KRCS Annual State Education Seminar Recognizing and Correcting Patient-Ventilator Dysynchrony Eric Kriner BS,RRT Pulmonary Critical Care Clinical Specialist MedStar Washington Hospital Center Washington,
More informationIMPLEMENTATION AT THE BEDSIDE
CLINICAL EVIDENCE GUIDE IMPLEMENTATION AT THE BEDSIDE Puritan Bennett PAV+ Software Utilization of the PAV+ software has been demonstrated to reduce asynchrony and improve respiratory mechanics. 2 Yet,
More informationAPRV for ARDS: the complexities of a mode and how it affects even the best trials
Editorial APRV for ARDS: the complexities of a mode and how it affects even the best trials Eduardo Mireles-Cabodevila 1,2, Siddharth Dugar 1,2, Robert L. Chatburn 1,2 1 Respiratory Institute, Cleveland
More informationINTRODUCTION The effect of CPAP works on lung mechanics to improve oxygenation (PaO 2
2 Effects of CPAP INTRODUCTION The effect of CPAP works on lung mechanics to improve oxygenation (PaO 2 ). The effect on CO 2 is only secondary to the primary process of improvement in lung volume and
More informationAPRV: An Update CHLOE STEINSHOUER, MD PULMONARY & SLEEP CONSULTANTS OF KANSAS 04/06/2017
APRV: An Update CHLOE STEINSHOUER, MD PULMONARY & SLEEP CONSULTANTS OF KANSAS 04/06/2017 Disclosures No conflicts of interest Objectives Attendees will be able to: Define the mechanism of APRV Describe
More informationHigher PEEP improves outcomes in ARDS patients with clinically objective positive oxygenation response to PEEP: a systematic review and meta-analysis
Guo et al. BMC Anesthesiology (2018) 18:172 https://doi.org/10.1186/s12871-018-0631-4 RESEARCH ARTICLE Open Access Higher PEEP improves outcomes in ARDS patients with clinically objective positive oxygenation
More informationRecruitment Maneuvers and Higher PEEP, the So-Called Open Lung Concept, in Patients with ARDS
Zee and Gommers Critical Care (2019) 23:73 https://doi.org/10.1186/s13054-019-2365-1 REVIEW Recruitment Maneuvers and Higher PEEP, the So-Called Open Lung Concept, in Patients with ARDS Philip van der
More informationOxygenation Failure. Increase FiO2. Titrate end-expiratory pressure. Adjust duty cycle to increase MAP. Patient Positioning. Inhaled Vasodilators
Oxygenation Failure Increase FiO2 Titrate end-expiratory pressure Adjust duty cycle to increase MAP Patient Positioning Inhaled Vasodilators Extracorporeal Circulation ARDS Radiology Increasing Intensity
More informationUPMC Critical Care
UPMC Critical Care www.ccm.pitt.edu Cardiovascular insufficiency with Initiation and Withdrawal of Mechanical Ventilation Michael R. Pinsky, MD, Dr hc Department of Critical Care Medicine University of
More informationRegional distribution of transpulmonary pressure
Review Article Page 1 of 8 Regional distribution of transpulmonary pressure Pedro Leme Silva 1, Marcelo Gama de Abreu 2 1 Laboratory of Pulmonary Investigation, Carlos Chagas Filho Institute of Biophysics,
More informationRefresher Course MYTHS AND REALITY ABOUT LUNG MECHANICS 5 RC 2. European Society of Anaesthesiologists FIGURE 1 STATIC MEASUREMENTS
European Society of Anaesthesiologists Refresher Course S AND ABOUT LUNG MECHANICS 5 RC 2 Anders LARSSON Gentofte University Hospital Copenhagen University Hellerup, Denmark Saturday May 31, 2003 Euroanaesthesia
More informationPrinciples of Mechanical Ventilation
47 Principles of Mechanical Ventilation Jonathan E. Sevransky, MD, MHS Objectives Understand the indications for treatment with mechanical ventilation Describe ventilator strategies that will minimize
More informationComputed tomography in adult respiratory distress syndrome: what has it taught us?
Eur Respir J, 1996, 9, 155 162 DOI: 1.1183/931936.96.95155 Printed in UK - all rights reserved Copyright ERS Journals Ltd 1996 European Respiratory Journal ISSN 93-1936 SERIES 'CLINICAL PHYSIOLOGY IN RESPIRATORY
More informationDr. Yasser Fathi M.B.B.S, M.Sc, M.D. Anesthesia Consultant, Head of ICU King Saud Hospital, Unaizah
BY Dr. Yasser Fathi M.B.B.S, M.Sc, M.D Anesthesia Consultant, Head of ICU King Saud Hospital, Unaizah Objectives For Discussion Respiratory Physiology Pulmonary Graphics BIPAP Graphics Trouble Shootings
More informationManagement of refractory ARDS. Saurabh maji
Management of refractory ARDS Saurabh maji Refractory hypoxemia as PaO2/FIO2 is less than 100 mm Hg, inability to keep plateau pressure below 30 cm H2O despite a VT of 4 ml/kg development of barotrauma
More informationEffect of peak inspiratory pressure on the development. of postoperative pulmonary complications.
Effect of peak inspiratory pressure on the development of postoperative pulmonary complications in mechanically ventilated adult surgical patients: a systematic review protocol Chelsa Wamsley Donald Missel
More informationRecent Advances in Respiratory Medicine
Recent Advances in Respiratory Medicine Dr. R KUMAR Pulmonologist Non Invasive Ventilation (NIV) NIV Noninvasive ventilation (NIV) refers to the administration of ventilatory support without using an invasive
More informationTroubleshooting of Nursing Practice for Mechanically Ventilated Patients
Troubleshooting of Nursing Practice for Mechanically Ventilated Patients *1 Dr. Hanan Mohammed Mohammed, 2 Dr. Abeer El-Said Hassan 1 Assistant Professor of Medical-Surgical Nursing Department, Faculty
More informationVentilator ECMO Interactions
Ventilator ECMO Interactions Lorenzo Del Sorbo, MD CCCF Toronto, October 2 nd 2017 Disclosure Relevant relationships with commercial entities: none Potential for conflicts within this presentation: none
More information1. When a patient fails to ventilate or oxygenate adequately, the problem is caused by pathophysiological factors such as hyperventilation.
Chapter 1: Principles of Mechanical Ventilation TRUE/FALSE 1. When a patient fails to ventilate or oxygenate adequately, the problem is caused by pathophysiological factors such as hyperventilation. F
More informationLandmark articles on ventilation
Landmark articles on ventilation Dr Shrikanth Srinivasan MD,DNB,FNB,EDIC Consultant, Critical Care Medicine Medanta, The Medicity ARDS AECC DEFINITION-1994 ALI Acute onset Bilateral chest infiltrates PCWP
More informationARDS and Lung Protection
ARDS and Lung Protection Kristina Sullivan, MD Associate Professor University of California, San Francisco Department of Anesthesia and Perioperative Care Division of Critical Care Medicine Overview Low
More informationThe new ARDS definitions: what does it mean?
The new ARDS definitions: what does it mean? Richard Beale 7 th September 2012 METHODS ESICM convened an international panel of experts, with representation of ATS and SCCM The objectives were to update
More informationACUTE RESPIRATORY DISTRESS SYNDROME (ARDS) Rv
ACUTE RESPIRATORY DISTRESS SYNDROME (ARDS) Rv.8.18.18 ACUTE RESPIRATORY DISTRESS SYNDROME (ARDS) SUDDEN PROGRESSIVE FORM OF ACUTE RESPIRATORY FAILURE ALVEOLAR CAPILLARY MEMBRANE BECOMES DAMAGED AND MORE
More informationORIGINAL RESEARCH. Effect of Tidal Volume Size and Its Delivery Mode on Patient Ventilator Dyssynchrony. Abstract
Effect of Tidal Volume Size and Its Delivery Mode on Patient Ventilator Dyssynchrony Juan B. Figueroa-Casas 1 and Ricardo Montoya 2 1 Division of Pulmonary and Critical Care Medicine, Texas Tech University
More informationSub-category: Intensive Care for Respiratory Distress
Course n : Course 3 Title: RESPIRATORY PHYSIOLOGY, PHYSICS AND PATHOLOGY IN RELATION TO ANAESTHESIA AND INTENSIVE CARE Sub-category: Intensive Care for Respiratory Distress Topic: Acute Respiratory Distress
More informationNew Modes and New Concepts In Mechanical Ventilation
New Modes and New Concepts In Mechanical Ventilation Prof Department of Anesthesia and Surgical Intensive Care Cairo University 1 2 New Ventilation Modes Dual Control Within-a-breath switches from PC to
More informationPatient Asynchrony and Its Impact on Patient Outcome
Patient Asynchrony and Its Impact on Patient Outcome 5-14-18 CSRC Bob Kacmarek PhD, RRT Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts Conflict of Interest Disclosure Robert
More informationProportional Assist Ventilation (PAV) (NAVA) Younes ARRD 1992;145:114. Ventilator output :Triggering, Cycling Control of flow, rise time and pressure
Conflict of Interest Disclosure Robert M Kacmarek Unconventional Techniques Using Your ICU Ventilator!" 5-5-17 FOCUS Bob Kacmarek PhD, RRT Massachusetts General Hospital, Harvard Medical School, Boston,
More informationAnalyzing Lung protective ventilation F Javier Belda MD, PhD Sº de Anestesiología y Reanimación. Hospital Clinico Universitario Valencia (Spain)
Analyzing Lung protective ventilation F Javier Belda MD, PhD Sº de Anestesiología y Reanimación Hospital Clinico Universitario Valencia (Spain) ALI/ARDS Report of the American-European consensus conference
More informationNoninvasive respiratory support:why is it working?
Noninvasive respiratory support:why is it working? Paolo Pelosi Department of Surgical Sciences and Integrated Diagnostics (DISC) IRCCS San Martino IST University of Genoa, Genoa, Italy ppelosi@hotmail.com
More informationReview Article. Interactive Physiology in Critical Illness : Pulmonary and Cardiovascular Systems. Introduction
310 Indian Deepak J Physiol Shrivastava Pharmacol 2016; 60(4) : 310 314 Indian J Physiol Pharmacol 2016; 60(4) Review Article Interactive Physiology in Critical Illness : Pulmonary and Cardiovascular Systems
More informationPatient-Ventilator Synchrony and Impact on Outcome
Variables Controlled during Mechanical Ventilation Patient-Ventilator Synchrony and Impact on Outcome 9-30-17 Cox Bob Kacmarek PhD, RRT Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
More informationC h a p t e r 1 4 Ventilator Support
C h a p t e r 1 4 Ventilator Support Shirish Prayag Ex. Hon. Asst. Prof of Medicine, BJ Medical College and Sassoon Hospital, Pune; Chief Consultant in Internal Medicine and Critical Care, Shree Medical
More informationHandling Common Problems & Pitfalls During. Oxygen desaturation in patients receiving mechanical ventilation ACUTE SEVERE RESPIRATORY FAILURE
Handling Common Problems & Pitfalls During ACUTE SEVERE RESPIRATORY FAILURE Pravit Jetanachai, MD QSNICH Oxygen desaturation in patients receiving mechanical ventilation Causes of oxygen desaturation 1.
More informationARDS: an update 6 th March A. Hakeem Al Hashim, MD, FRCP SQUH
ARDS: an update 6 th March 2017 A. Hakeem Al Hashim, MD, FRCP SQUH 30M, previously healthy Hx: 1 week dry cough Gradually worsening SOB No travel Hx Case BP 130/70, HR 100/min ph 7.29 pco2 35 po2 50 HCO3
More informationPhysiology to Improve RCTs
Physiology to Improve RCTs Brian Kavanagh Hospital for Sick Children University of Toronto 1 Conflicts of Interest No financial conflict of interest with the subject matter of this talk Where s the Interest
More informationClose down the lungs and keep them resting to minimize ventilator-induced lung injury
Pelosi et al. Critical Care (2018) 22:72 https://doi.org/10.1186/s13054-018-1991-3 REVIEW Close down the lungs and keep them resting to minimize ventilator-induced lung injury Paolo Pelosi 1*, Patricia
More informationThe use of proning in the management of Acute Respiratory Distress Syndrome
Case 3 The use of proning in the management of Acute Respiratory Distress Syndrome Clinical Problem This expanded case summary has been chosen to explore the rationale and evidence behind the use of proning
More informationBi-Level Therapy: Boosting Comfort & Compliance in Apnea Patients
Bi-Level Therapy: Boosting Comfort & Compliance in Apnea Patients Objectives Describe nocturnal ventilation characteristics that may indicate underlying conditions and benefits of bilevel therapy for specific
More informationReview Clinical review: Biphasic positive airway pressure and airway pressure release ventilation Christian Putensen 1 and Hermann Wrigge 2
Critical Care December 2004 Vol 8 No 6 Putensen and Wrigge Review Clinical review: Biphasic positive airway pressure and airway pressure release ventilation Christian Putensen 1 and Hermann Wrigge 2 1
More informationMechanical Ventilation 1. Shari McKeown, RRT Respiratory Services - VGH
Mechanical Ventilation 1 Shari McKeown, RRT Respiratory Services - VGH Objectives Describe indications for mcvent Describe types of breaths and modes of ventilation Describe compliance and resistance and
More informationTracking lung recruitment and regional tidal volume at the bedside. Antonio Pesenti
Tracking lung recruitment and regional tidal volume at the bedside Antonio Pesenti Conflicts of Interest Maquet: Received research support and consultation fees Drager: Received research support and consultation
More informationOutline. Basic principles of lung protective ventilation. The challenging areas. Small tidal volumes Recruitment
ARDS beyond 6/kg Gordon D. Rubenfeld, MD MSc Professor of Medicine, University of Toronto Chief, Program in Trauma, Emergency, and Critical Care Sunnybrook Health Sciences Centre Outline Basic principles
More informationMechanical ventilation in the emergency department
Mechanical ventilation in the emergency department Intubation and mechanical ventilation are often needed in emergency treatment. A ENGELBRECHT, MB ChB, MMed (Fam Med), Dip PEC, DA Head, Emergency Medicine
More informationSimulation of Late Inspiratory Rise in Airway Pressure During Pressure Support Ventilation
Simulation of Late Inspiratory Rise in Airway Pressure During Pressure Support Ventilation Chun-Hsiang Yu MD, Po-Lan Su MD, Wei-Chieh Lin MD PhD, Sheng-Hsiang Lin PhD, and Chang-Wen Chen MD MSc BACKGROUND:
More informationProne Position in ARDS
Prone Position in ARDS Rich Kallet MS RRT FAARC, FCCM Respiratory Care Services San Francisco General Hospital University of California, San Francisco, Case Study A 39 yo F admitted to SFGH TICU s/p hanging,
More informationAPPENDIX VI HFOV Quick Guide
APPENDIX VI HFOV Quick Guide Overall goal: Maintain PH in the target range at the minimum tidal volume. This is achieved by favoring higher frequencies over lower P (amplitude). This goal is also promoted
More informationNIV use in ED. Dr. Khalfan AL Amrani Emergency Resuscitation Symposium 2 nd May 2016 SQUH
NIV use in ED Dr. Khalfan AL Amrani Emergency Resuscitation Symposium 2 nd May 2016 SQUH Outline History & Introduction Overview of NIV application Review of proven uses of NIV History of Ventilation 1940
More informationRespiratory Physiology
Respiratory Physiology Dr. Aida Korish Associate Prof. Physiology KSU The main goal of respiration is to 1-Provide oxygen to tissues 2- Remove CO2 from the body. Respiratory system consists of: Passages
More informationEffects of the use of neuromuscular blocking agents on acute respiratory distress syndrome outcomes: A systematic review
Effects of the use of neuromuscular blocking agents on acute respiratory distress syndrome outcomes: A systematic review Samantha Paramore, AG-ACNP BC ABSTRACT Background and purpose: Acute respiratory
More informationThe Influence of Altered Pulmonarv
The Influence of Altered Pulmonarv J Mechanics on the Adequacy of Controlled Ventilation Peter Hutchin, M.D., and Richard M. Peters, M.D. W ' hereas during spontaneous respiration the individual determines
More informationPulmonary & Extra-pulmonary ARDS: FIZZ or FUSS?
Pulmonary & Extra-pulmonary ARDS: FIZZ or FUSS? Dr. Rajagopala Srinivas Senior Resident, Dept. Pulmonary Medicine, PGIMER, Chandigarh. The beginning.. "The etiology of this respiratory distress syndrome
More informationComparison of automated and static pulse respiratory mechanics during supported ventilation
Comparison of automated and static pulse respiratory mechanics during supported ventilation Alpesh R Patel, Susan Taylor and Andrew D Bersten Respiratory system compliance ( ) and inspiratory resistance
More information11 th Annual Congress Turkish Thoracic Society. Mechanical Ventilation in Acute Hypoxemic Respiratory Failure
11 th Annual Congress Turkish Thoracic Society Mechanical Ventilation in Acute Hypoxemic Respiratory Failure Lluis Blanch MD PhD Senior Critical Care Center Scientific Director Corporació Parc Taulí Universitat
More informationWhat s New About Proning?
1 What s New About Proning? J. Brady Scott, MSc, RRT-ACCS, AE-C, FAARC Director of Clinical Education and Assistant Professor Department of Cardiopulmonary Sciences Division of Respiratory Care Rush University
More informationJournal Club American Journal of Respiratory and Critical Care Medicine. Zhang Junyi
Journal Club 2018 American Journal of Respiratory and Critical Care Medicine Zhang Junyi 2018.11.23 Background Mechanical Ventilation A life-saving technique used worldwide 15 million patients annually
More informationRespiratory insufficiency in bariatric patients
Respiratory insufficiency in bariatric patients Special considerations or just more of the same? Weaning and rehabilation conference 6th November 2015 Definition of obesity Underweight BMI< 18 Normal weight
More informationThe baby lung became an adult
Intensive Care Med (2016) 42:663 673 DOI 10.1007/s00134-015-4200-8 REVIEW Luciano Gattinoni John J. Marini Antonio Pesenti Michael Quintel Jordi Mancebo Laurent Brochard The baby lung became an adult Received:
More informationEffects of patient positioning on respiratory mechanics in mechanically ventilated ICU patients
Review Article Page 1 of 9 Effects of patient positioning on respiratory mechanics in mechanically ventilated ICU patients Mehdi Mezidi 1,2, Claude Guérin 1,2,3 1 Service de réanimation médicale, Hôpital
More informationARDS Management Protocol
ARDS Management Protocol February 2018 ARDS Criteria Onset Within 1 week of a known clinical insult or new or worsening respiratory symptoms Bilateral opacities not fully explained by effusions, lobar/lung
More informationSurviving Sepsis Campaign. Guidelines for Management of Severe Sepsis/Septic Shock. An Overview
Surviving Sepsis Campaign Guidelines for Management of Severe Sepsis/Septic Shock An Overview Mechanical Ventilation of Sepsis-Induced ALI/ARDS ARDSnet Mechanical Ventilation Protocol Results: Mortality
More informationRespiratory Mechanics
Respiratory Mechanics Critical Care Medicine Specialty Board Tutorial Dr Arthur Chun-Wing LAU Associate Consultant Intensive Care Unit, Pamela Youde Nethersole Eastern Hospital, Hong Kong 17 th June 2014
More information2016 Year in Review: Noninvasive Ventilation
2016 Year in Review: Noninvasive Ventilation Thomas Piraino RRT Introduction NIV Compared With High-Flow Nasal Cannula Immunocompromised Patients Postextubation in Patients at Risk of Extubation Failure
More informationLung Recruitment Strategies in Anesthesia
Lung Recruitment Strategies in Anesthesia Intraoperative ventilatory management to prevent Post-operative Pulmonary Complications Kook-Hyun Lee, MD, PhD Department of Anesthesiology Seoul National University
More informationThe Vigileo monitor by Edwards Lifesciences supports both the FloTrac Sensor for continuous cardiac output and the Edwards PreSep oximetry catheter
1 2 The Vigileo monitor by Edwards Lifesciences supports both the FloTrac Sensor for continuous cardiac output and the Edwards PreSep oximetry catheter for continuous central venous oximetry (ScvO2) 3
More informationFrankfurt, January
Frankfurt, January 12-13 2018 Frankfurt, January 12-13 2018 SMART ORGANIZING AND SCIENTIFIC COMMITTEE M. Antonelli, G. Bellani, A. Braschi, G. Conti, L. Gattinoni, A. Pesenti, M. Quintel, F. Raimondi,
More informationVentilation: Theory and Practice
AACN Clinical Issues Volume 12, Number 2, pp. 234 246 2001, AACN Airway Pressure Release Ventilation: Theory and Practice P. Milo Frawley, RN, MS,* and Nader M. Habashi, MD Airway pressure release ventilation
More informationEsophageal and transpulmonary pressure in the clinical setting: meaning, usefulness and perspectives
Intensive Care Med (2016) 42:1360 1373 DOI 10.1007/s00134-016-4400-x REVIEW Esophageal and transpulmonary pressure in the clinical setting: meaning, usefulness and perspectives Tommaso Mauri1, Takeshi
More informationCardiorespiratory Interactions:
Cardiorespiratory Interactions: The Heart - Lung Connection Jon N. Meliones, MD, MS, FCCM Professor of Pediatrics Duke University Medical Director PCVICU Optimizing CRI Cardiorespiratory Economics O2:
More informationAPRV Ventilation Mode
APRV Ventilation Mode Airway Pressure Release Ventilation A Type of CPAP Continuous Positive Airway Pressure (CPAP) with an intermittent release phase. Patient cycles between two levels of CPAP higher
More informationDriving pressure: a marker of severity, a safety limit, or a goal for mechanical ventilation?
Bugedo et al. Critical Care (2017) 21:199 DOI 10.1186/s13054-017-1779-x VIEWPOINT Driving pressure: a marker of severity, a safety limit, or a goal for mechanical ventilation? Guillermo Bugedo *, Jaime
More informationBreathing life into new therapies: Updates on treatment for severe respiratory failure. Whitney Gannon, MSN ACNP-BC
Breathing life into new therapies: Updates on treatment for severe respiratory failure Whitney Gannon, MSN ACNP-BC Overview Definition of ARDS Clinical signs and symptoms Causes Pathophysiology Management
More informationVentilator Dyssynchrony - Recognition, implications, and management
Ventilator Dyssynchrony - Recognition, implications, and management Gavin M Joynt Dept of Anaesthesia & Intensive Care The Chinese University of Hong Kong Dyssynchrony Uncoupling of mechanical delivered
More informationSeminar. Current Concepts
Seminar Current Concepts In ARDS What I think is possible to cover in 40 minutes- Definition Management Ventilatory strategies Conventional LPV Rescue therapy Non Ventilatory strategies Definition and
More informationFAILURE OF NONINVASIVE VENTILATION FOR DE NOVO ACUTE HYPOXEMIC RESPIRATORY FAILURE: ROLE OF TIDAL VOLUME
FAILURE OF NONINVASIVE VENTILATION FOR DE NOVO ACUTE HYPOXEMIC RESPIRATORY FAILURE: ROLE OF TIDAL VOLUME Guillaume CARTEAUX, Teresa MILLÁN-GUILARTE, Nicolas DE PROST, Keyvan RAZAZI, Shariq ABID, Arnaud
More informationCapnography Connections Guide
Capnography Connections Guide Patient Monitoring Contents I Section 1: Capnography Introduction...1 I Section 2: Capnography & PCA...3 I Section 3: Capnography & Critical Care...7 I Section 4: Capnography
More informationCompetency Title: Continuous Positive Airway Pressure
Competency Title: Continuous Positive Airway Pressure Trainee Name: ------------------------------------------------------------- Title: ---------------------------------------------------------------
More informationThe Prone Position Eliminates Compression of the Lungs by the Heart
The Prone Position Eliminates Compression of the Lungs by the Heart RICHARD K. ALBERT and ROLF D. HUBMAYR Medical Service, Denver Health Medical Center, and Department of Medicine, University of Colorado
More informationARDS A Brief Overview. Lucas Pitts, M.D. Assistant Professor of Medicine Pulmonary and Critical Care Medicine University of Kansas School of Medicine
ARDS A Brief Overview Lucas Pitts, M.D. Assistant Professor of Medicine Pulmonary and Critical Care Medicine University of Kansas School of Medicine Outline Definition of ARDS Epidemiology of ARDS Pathophysiology
More informationMonitor the patients disease pathology and response to therapy Estimate respiratory mechanics
Understanding Graphics during Mechanical Ventilation Why Understand Ventilator Graphics? Waveforms are the graphic representation of the data collected by the ventilator and reflect the interaction between
More informationInstellen van beademingsparameters bij de obese pa3ent. MDO Nynke Postma
Instellen van beademingsparameters bij de obese pa3ent MDO 19-1- 2015 Nynke Postma 1. Altered respiratory mechanics in obese pa@ents 2. Transpulmonary pressure 3. Titra@ng PEEP 4. Titra@ng @dal volume
More informationMechanical Ventilation in COPD patients
Mechanical Ventilation in COPD patients Θεόδωρος Βασιλακόπουλος Καθηγητής Πνευμονολογίας-Εντατικής Θεραπείας Εθνικό & Καποδιστριακό Πανεπιστήμιο Αθηνών Νοσοκομείο «ο Ευαγγελισμός» Adjunct Professor, McGill
More informationMultiple organ. support
ICU MANAGEMENT & PRACTICE Intensive care - Emergency Medicine - Anaesthesiology VOLUME 18 - ISSUE 1 - spring 2018 SPECIAL SUPPLEMENTS Hamilton Medical symposium: Optimising patient-ventilator synchronisation
More informationPart 2 of park s Ventilator and ARDS slides for syllabus
Part 2 of park s Ventilator and ARDS slides for syllabus Early Neuromuscular Blockade Question 4 The early use of cis-atracurium in severe ARDS is: A. Contraindicated in patients with diabetes B. Associated
More informationBiomedical engineer s guide to the clinical aspects of intensive care mechanical ventilation
https://doi.org/10.1186/s12938-018-0599-9 BioMedical Engineering OnLine REVIEW Open Access Biomedical engineer s guide to the clinical aspects of intensive care mechanical ventilation Vincent J. Major
More information