PAPER DE LA VNI EN LA RETIRADA DE LA VENTILACIÓ INVASIVA I FRACÀS D EXTUBACIÓ
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1 PAPER DE LA VNI EN LA RETIRADA DE LA VENTILACIÓ INVASIVA I FRACÀS D EXTUBACIÓ Dr. Miquel Ferrer UVIIR, Servei de Pneumologia, Hospital Clínic, IDIBAPS, CibeRes, Barcelona. E- mail: miferrer@clinic.ub.es Barcelona, 3 de novembre de 21
2 Withdrawal of mechanical ventilation
3 Weaning period 4-5% of total duration of ventilation Longer ventilation related to higher mortality Survival and prolonged mechanical ventilation 5,2 ventilated patients 361 ICUs Europe, North and South America Esteban A. JAMA 22; 287:345
4 Non-invasive ventilation 11.1% Patients ventilated >12 h (n=4,968) Planned extubation (n=1,649) Prior MV: 4 days Weaning: 4% of total MV Spontaneous breathing trial 62% T-piece: 71% Low levels PSV: 14% Extubated after 1 st weaning attempt 77% Needed >1 weaning attempt 23% Re-intubation rate: 12% Tracheostomy: 12.5% Median timing: 11 days Mode of ventilation: PSV: 55% ACV: 28% SIMV-PSV: 15% SIMV <2%
5 New classification of weaning Estimated 69% Estimated 31%
6 Comportamiento de la función cardio-pulmonar en el éxito de la retirada de la VM Ventilación mecánica (con presión positiva) Respiración espontánea (con presión negativa) actividad de músculos respiratorios retorno venoso Patrón respiratorio rápido y superficial demandas metabólicas (consumo O 2, producción CO 2 ) Respuesta cardiovascular adecuada ( Aporte periférico de O 2 ) Remodelado de factores intra y extrapulmonares determinantes de los gases arteriales
7 35 Respiratory rate 8 Tidal volume (ml) * * 1 3 ACV PSV SB ACV PSV SB Rapid and shallow breathing pattern during spontaneous breathing No changes in minute ventilation
8 23 PaO 2 /FiO 2 6 PaCO * 2 ACV PSV SB 45 ACV PSV SB 8 Q P T (L/min) V O 2 (mmhg) ACV PSV SB * p<.1 * p< ACV PSV SB Q T and P V O 2 increased during spontaneous breathing, preventing a fall in PaO 2
9 Mean Q * Dispersion of blood flow Dead space (% V A ) * ACV PSV SB ACV PSV SB ACV PSV SB Increase of dead space and overall lung perfusion during spontaneous breathing without changes in V A /Q mismatching
10 Retirada de la ventilación mecánica con éxito Patrón ventilatorio rápido y superficial Mínimos cambios en los factores intrapulmonares del intercambio de gases Respuesta cardiovascular adecuada: Aumento Q T, DO 2 y P V O 2 No cambios en oxigenación arterial
11 Pathophysiologic bases of weaning failure Load Capacity Increased: Breathing drive Workload Ventilatory demands Left ventricular afterload Inappropriate cardiovascular response Hyperinflation Reduced inspiratory muscle strength Rapid and shallow breathing Respiratory distress Hypercapnia-acidosis
12 Unsuccessful weaning in COPD patients Rapid and shallow breathing pattern Increased workload of respiratory muscles R INSP E DYN PEEP I Tobin MJ. Am Rev Respir Dis 1986;134: Jubran A. Am J Respir Crit Care Med 1997;155:96-15
13 Inappropriate cardiovascular response in unsuccessful weaning Increased venous return to right ventricle Large negative deflections in intrathoracic pressure Increased left ventricular afterload Fall of P V O 2 and S V O 2 Jubran A. AJRCCM 1998;158:1763 Lemaire F. Anesthesiology 1988;69:171
14 Approaches proposed to optimize weaning Protocol-driven weaning: Daily screening of respiratory function Respiratory therapists vs physicians Pressure-support vs assist-control ventilation Daily spontaneous breathing trials Automated systems 2-3% patients can not be extubated after the first weaning attempt
15 NIV as part of a protocol-driven weaning Improvement of underlying indication for MV DAILY SCREENING of respiratory function NO Mechanical ventilation and daily screening Acceptable parameters No signs of poor tolerance EXTUBATION YES SPONTANEOUS BREATHING TRIAL Contraindications for NPPV GRADUAL WITHDRAWAL OF VENTILATORY SUPPORT Signs of poor tolerance Prolonged ventilation Consider Tracheotomy No contraindications for NPPV Chronic respiratory disease? Hypercapnia? EXTUBATION + NPPV Adapted from Esteban A. Intensive Care Med 1998;24:999
16 Difficult weaning and non-invasive ventilation
17 The addition of PEEP to non-invasive PSV resulted in additional decrease of the work of breathing
18 The improvement of respiratory blood gases is due to higher alveolar ventilation NIV attained a more efficient breathing pattern V A /Q relationships did not change
19 Non-invasive PSV in ventilator-dependent chronic respiratory patients T-piece trial Invasive-PSV Extubation Spontaneous breathing Noninvasive-PSV cmh 2 O x s/l Vitacca M. Am J Respir Crit Care Med 21;164:638 PTPdi/V TE * ** i-psv n-psv T-piece S.B. mmhg PaCO 2 i-psv n-psv T-piece
20 Prolonged weaning associated with worse outcome: No different outcomes between simple and difficult weaning Factors implicated in prolonged weaning no assessed Patients ventilated >48 h undergoing planned extubation (n=181) Simple weaning (n=81) Difficult weaning (n=67) Prolonged weaning (n=33) Characteristics and outcomes from the 3 groups Predictive factors for prolonged weaning and survival Sellares J, Ferrer M et al. Submitted
21 Is prolonged weaning clinically relevant? Hospital stay ICU mortality n=1 p=.18 p<.1 n=8 n=14 Simple weaning Difficult weaning Prolonged weaning 5 4 % % Ventilator-associated pneumonia n=12 Hospital mortality n=15 p=.5 n=13 p=.4 n=16 n=14 n= % p=.19 9-day survival Days Simple Difficult Prolonged Sellares J, Ferrer M et al. Intensive Care Med (1 st revision)
22 mmhg The problem of hypercapnia during weaning 6 Simple weaning PaCO Difficult weaning 2 Prolonged weaning Simple p=.1 Difficult Prolonged % p=.1 9-day survival Normocapnia Hypercapnia Days Independent predictors of prolonged weaning and survival Prolonged weaning Cutoff Adj. OR 95%-CI p value Heart rate SBT 15 min <.1 PaCO 2 SBT 54 mmhg Decreased 9-d survival Adj. OR 95%-CI p value Re-intubation criteria <.1 PaCO 2 during SBT Sellares J, Ferrer M et al. Intensive Care Med (1 st revision)
23 CO 2 retention and outcome of weaning Increased CO 2 retention during spontaneous breathing strongly predicts prolonged weaning and mortality Higher PaCO 2 also related with respiratory failure after extubation (OR: 1.46, p=.4) Increased PaCO 2 is amenable of medical intervention Detection of high levels of PaCO 2 implement measures to shorten weaning and avoid re-intubation (NIV!!!)
24 Clinical advantages of the early removal of the ETT Communication Patient comfort Effective cough Mucociliary clearance Sinus drainage Sedation Nosocomial infection/vap Work of breathing Adapted from Noninvasive Positive Pressure Ventilation, NS Hill ed., Futura Pub 21
25 When to use NIV during withdrawal of mechanical ventilation? Weaning failure (difficult and prolonged) Early extubation Respiratory failure after extubation: Management Prevention
26 NPPV in COPD and early extubation One failed weaning attempt (within 48 h of MV) Mean PaCO 2 : mmhg, mean pha: Patients who could not be weaned from MV Days % 6-d weaning success p<.1 1 n=22 8 n= NIV Standard MV duration 3 ICU stay p<.5 p< NIV Standard NIV Standard % 2 1 n= NIV Pneumonia ICU survival n=7 1 p<.1 p<.1 8 n=18 3 n=23 Standard % Standard weaning NIV NIV Standard Nava S. Ann Intern Med 1998;128:721
27 NPPV in ACRF and single weaning failure Single failed weaning attempt Mean PaCO 2 : 6-64 mmhg, mean pha: Duration of endotracheal mechanical ventilation 3-day reduction of ETMV No changes in major clinical outcomes Small sample size Girault C. Am J Respir Crit Care Med 1999;16:86
28 NIV during persistent weaning failure Failed weaning attempts for 3 consecutive days 77% chronic respiratory (6% COPD) Mean PaCO 2 : mmhg 25 Mean pha: % Nosocomial pneumonia p=.42 n=5 NIV n=13 Control Ferrer M et al. Am J Respir Crit Care Med 23;168:7 Tracheostomy p<.1 n=13 n=1 NIV Control Duration of intubation 1 p= NIV Standard ICU Survival n=19 NIV p=.45 n=13 Control 1 Successfully weaned patients % p=.2 NIV Control Duration of ventilation (days) day survival NIV Control p=
29 BMJ. 29 May 21;338:b1574. doi: /bmj.b1574 Meta-analysis of 12 RCTs Extubation with immediate NPPV vs weaning using IPPV
30 NIV during difficult weaning Primary end-point: Shortening weaning Secondary end-points: Decreasing complications associated to prolonged MV and mortality Currently available RCTs: Nearly all with chronic respiratory disorders and hypercapnia Frequent cardiac co-morbidity Limited number of patients: Overall 53 in 12 trials, but Only 3 trials in high quartile peer-review journals (126 patients) Future multicentre RCTs? France, 2 inclusions
31 Clinical relevance of extubation failure
32 Incidence and outcome of re-intubation Incidence: 6-23% planned extubations Crude mortality rate: 12-68% Independent risk factor for: Nosocomial pneumonia Increased mortality Increased length of stay Torres A. Am J Respir Crit Care Med 1995;152:137 Epstein SK. Chest 1997;112:186
33 Patients ventilated >12 h (n=4,968) Non-invasive ventilation 11.1% Planned extubation (n=1,649) Prior MV: 4 days Weaning: 4% of total MV Spontaneous breathing trial 62% Extubated after 1 st weaning attempt 77% Needed >1 weaning attempt 23% Re-intubation rate: 12%
34 Effect of failed extubation on the outcome of mechanical ventilation Hospital mortality 5 p<.1 25 ICU stay p<.1 4 Hospital stay p< % 3 2 Days Extubation success Extubation failure Independent predictors of death Epstein SK. Chest 1997;112:186
35 Time from extubation to re-eti -12 h Incidence Mortality h h h % Time to re-eti was an independent predictor of mortality
36 Predicting extubation outcome Better prediction Shorter duration of MV Delay of extubation Advance of extubation Risks derived from prolonged ventilation Risks derived from reintubation Is there an optimal rate of post-extubation failure? Test accuracy may be less important if NIV is effective for extubation failure
37 Respiratory failure Heart failure Aspiration-excess secretions Upper airway obstruction Encephalopathy Causes potentially responding to NIV accounted for half of reintubations and had high mortality Mortality Incidence Other %
38 When can NIV be used after extubation? Respiratory failure after extubation: Management (late use) Prevention (early use
39 NPPV for post-extubation respiratory distress 81 patients Mixed population: Cardiac: 35% Respiratory: 32% (COPD 11%!!!!) % Methods.... After the first year, patients with an acute exacerbation of COPD were excluded because the randomized trial evidence strongly supported the use of NPPV for these patients and because NPPV was therefore applied when these patients developed respiratory distress n=28 NPPV Re-IT n=29 Standard Hospital survival n=27 n=29 NPPV Standard Keenan SP. JAMA 22;287:3238
40 NPPV in the management of post-extubation failure 221 patients Mixed population: COPD 1%!!!! % Re-ETI n=55 n= Time to re-eti (hours, median) p= % 2 ICU mortality p=.38 n=3 n=15 NIV Control NIV Control NIV Control Esteban A. N Engl J Med 24;35:2452
41 NPPV in the management of post-extubation failure Standard medical therapy These patients could be reintubated or crossed over to NIV if they met the predefined criteria for reintubation.. % 6 4 Re-IT ICU mortality p=.12 n=44 3 n=62 n=31 p=.31 2 n=12 2 NPPV Standard 1 NPPV Standard Esteban A. N Engl J Med 24;35:2452
42 When can NIV be used after extubation? Respiratory failure after extubation: Management (late use) Prevention (early use
43 (Crit Care Med 25; 33: ) Randomised clinical trial Successful weaning trial (33% COPD) At high-risk for RF after extubation % p=.27 n=4 Re-IT n=12 ICU mortality NIV Standard NIV Standard NIV independently associated to reduced risk for RF after extubation p=.64 n=3 n=9 % ICU mortality n=1 p<.1 n=2 Re-ETI No re-eti Re-IT strongly predicted mortality
44 Successful weaning trial (36% COPD or chronic bronchitis) Risk factors for RF after extubation % Extubation failure 4 p=.22 n=13 NIV n=27 Control % p=.429 % (n=113) 9-day survival Overall population p=.397 (n=162) Days p=.6 NIV group Control group No hypercapnia Hypercapnia Days % (n=49) Days
45 7% COPD or chronic bronchitis Successful weaning trial, hypercapnia while on spontaneous breathing % Respiratory failure after extubation 5 p< n=8 NIV n=25 Control % day survival p= Days NIV group Control group
46 Why? Control group NIV group AJRCCM Control group Lancet 29 NIV group Time from extubation (hours)
47 Severely obese patients NIV 48 h after extubation, compared with historically matched controls (n=62+62) % Respiratory failure p=.3 n=6 n= ICU length of stay p<.1 NIV Control Hosp. mortality p=.17 n=8 n=15 Hypercapnic patients during SBT Hospital mortality p=.3 n=4 n=11
48 Why such different outcomes in RF after extubation? Studies on prevention 1. Prophylactic NIV immediately after extubation 2. Higher proportions of chronic respiratory disorders (39% and 51%) 3. Ventilator specifically designed for NIV with high performance 4. Long-term experience (>1 yr) in clinical use and research with NIV 5. Scheduled periods of NIV delivery after extubation Studies on treatment 1. Therapeutic NIV after RF after extubation developed 2. Lower proportions of chronic respiratory disorders (COPD: 1-11%) 3. Ventilators with less performance or no specific ventilator 4. Minimal required experience with NIV of 1 year in both studies 5. After 4-12 h, no subsequent continuous delivery of NIV Nava S. Crit Care Med 25;32:2465 Ferrer M. Am J Respir Crit Care Med 26;173:164 Ferrer M. Lancet 29;374:182 Keenan SP. JAMA 22;287:3238 Esteban A. N Engl J Med 24;35:2452
49 Limitations of NIV in withdrawal of MV Main reasons for NIV failure Lack of co-operation, agitation Excessive secretions Hemodynamic instability Decreased consciousness (not hypercapnic) Protection of airways Tracheostomy?
50 NIV and respiratory failure after extubation Hypercapnia during spontaneous breathing trial is consistently associated with poor outcome In non-selected patients, NIV does not improve outcome of post-extubation failure and may be harmful In selected patients at high risk of re-intubation, it helps in preventing post-extubation failure Benefits of NIV in survival restricted to patients with hypercapnic respiratory failure
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