New Modes to Enhance Synchrony & Dietrich Henzler MD, PhD, FRCPC Division of Critical Care
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1 New Modes to Enhance Synchrony & Dietrich Henzler MD, PhD, FRCPC Division of Critical Care
2 Disclosure Conflicts of Interest Research Grants & Payments (cost reimbursements, speaker fees) Draeger Medical Air Liquide Hamilton Medical Hospira Fresenius Kabi
3 Petty TL Chest Jun;67(6):630-1.
4 The patient should not be unduly burdened, nor should the medical team rely on a ventilator set at the progressively lower rate to forestall disaster if the patient is not ready. Petty TL Chest Jun;67(6):630-1.
5 The patient should not be unduly burdened, nor should the medical team rely on a ventilator set at the progressively lower rate to forestall disaster if the patient is not ready. Discontinuation from ventilation requires no Petty TL Chest Jun;67(6):630-1.
6 Closed loop ventilation Intermittent Mandatory Ventilation 1975 Pressure Support Ventilation 1981 Proportional Assist Ventilation 1992 Automatic tube compensation 1994 Neurally Adjusted Ventilator Assist 1999 Adaptive Support Ventilation 1994 Smart Care 2004
7 Physiologic Breathing control Central controller Pons, medulla Input Output Sensors Chemoreceptors Lung, peripheral Effectors Respiratory muscles
8 Mechanical Breathing Cycle Inspiration Expiration Tidal volume Brain Phrenic nerve Airflow Diaphragm activation Lung expansion Diaphragm contraction
9 Mechanical Breathing Cycle Inspiration Hering- Breuer Expiration Brain Tidal volume Phrenic nerve Phrenic nerve Airflow Diaphragm activation Deflation Diaphragm de-activation Lung expansion Diaphragm contraction Airflow Diaphragm relaxation
10 Mechanical Breathing Cycle Inspiration Hering- Breuer Expiration Brain Tidal volume Phrenic nerve Phrenic nerve Airflow Diaphragm activation Deflation Diaphragm de-activation Lung expansion Diaphragm contraction Airflow Diaphragm relaxation
11 Mechanical Breathing Cycle Inspiration Hering- Breuer Expiration Brain Tidal volume Phrenic nerve Phrenic nerve Airflow Diaphragm activation Deflation Diaphragm de-activation Lung expansion Diaphragm contraction Airflow Diaphragm relaxation
12 Inspiratory Dyssynchrony Trigger delay Ineffective trigger wasted effort Auto-trigger Double trigger Inappropriate response Overshoot undersupport Colombo D. Crit Care Med 2011; 39:
13 1 Pdi Paw Flow 1. Start of patient effort 2. Generation of negative pressure / flow 3. Ventilator sensing (DT, triggering delay) 4. Ventilator action (DI, inspiratory delay)
14 1 2 Pdi Paw Flow 1. Start of patient effort 2. Generation of negative pressure / flow 3. Ventilator sensing (DT, triggering delay) 4. Ventilator action (DI, inspiratory delay)
15 1 2 3 Pdi Paw Flow DT 1. Start of patient effort 2. Generation of negative pressure / flow 3. Ventilator sensing (DT, triggering delay) 4. Ventilator action (DI, inspiratory delay)
16 Pdi Paw Flow DT 1. Start of patient effort 2. Generation of negative pressure / flow 3. Ventilator sensing (DT, triggering delay) 4. Ventilator action (DI, inspiratory delay) DI
17 Pdi Paw Flow DT 1. Start of patient effort 2. Generation of negative pressure / flow 3. Ventilator sensing (DT, triggering delay) 4. Ventilator action (DI, inspiratory delay) DI
18 Inspiratory Dyssynchrony Trigger delay Ineffective trigger wasted effort Autotrigger Double trigger Inappropriate response Overshoot undersupport Colombo D. Crit Care Med 2011; 39:
19 Inspiratory Dyssynchrony Trigger delay Ineffective trigger wasted effort Autotrigger Double trigger Inappropriate response Overshoot undersupport Colombo D. Crit Care Med 2011; 39:
20 Expiratory Dyssynchrony
21 Expiratory Dyssynchrony Premature termination Insufficient support Tachypnoea, rapid shallow breathing
22 Expiratory Dyssynchrony Premature termination Insufficient support Tachypnoea, rapid shallow breathing Delayed termination Airflow obstruction Patient fighting the ventilator
23 1 EAdi Paw 1. Start of electrical diaphragmatic activity / patient effort 2. End of patient breath 3. End of ventilator breath expiratory sensitivity - timed ending Flow
24 1 2 EAdi Paw 1. Start of electrical diaphragmatic activity / patient effort 2. End of patient breath 3. End of ventilator breath expiratory sensitivity - timed ending Flow
25 1 2 3 EAdi Paw 1. Start of electrical diaphragmatic activity / patient effort 2. End of patient breath 3. End of ventilator breath expiratory sensitivity - timed ending Flow
26 Clinical consequences Instability Pulmonary Added work of breathing Patient fighting the ventilator, desaturation Hemodynamically Need for sedation Delirium ICU length of stay, mortality
27 Clinical consequences 24% of patients (n=62, mech.vent.>24h)exhibited asynchrony index >10% Modes investigated PSV, A/C Thille A et al. Intensive Care Med 2006; 32:
28 Characteristics of new modes Triggering Minimize delay Appropriate support Adjust ventilation to need Adjust support to minimize WoB Adjust support to demand
29 Breathing Cycle Tidal volume Airflow Inspiration Brain Phrenic nerve Diaphragm activation Hering- Breuer Fixed Settings Frequent adjustments required Deflection Expiration Phrenic nerve Diaphragm de-activation Lung expansion Diaphragm contraction Airflow Diaphragm relaxation
30 Automated Tube Compensation P res = R Flow Fabry B. Technol Health Care 1994; 1:
31 Automated Tube Compensation P res = R PS Flow Fabry B. Technol Health Care 1994; 1:
32 Automated Tube Compensation P res = R PS overcompensation Flow Fabry B. Technol Health Care 1994; 1:
33 Automated Tube Compensation P res = R PS Undercompensation overcompensation Flow Fabry B. Technol Health Care 1994; 1:
34 Automated Tube Compensation P res = R Appropriate setting Undercompensation PS overcompensation Flow Fabry B. Technol Health Care 1994; 1:
35 ATC Application Calculation of added WoB (tube resistance) depending on inner diameter and length (Rohrer s Eq.) DPett [mmh 2 O] ΔP ETT = K 1 +K inspiration expiration V [L/sec] Fabry B. Technol Health Care 1994; 1:
36 ATC clinical studies Cross-over study in 12 surgical pts. Ready to wean ATC vs. PS 7 cmh 2 O vs. T-Piece Measurement of WoB and PTP Kuhlen R et al. European J Anaesthesiology 2003; 20: 10 16
37 ATC - Conclusions ADVANTAGES Unloads from added work of breathing Facilitates electronic extubation LIMITATIONS Uses fixed assumptions according to tube size No consideration of changes in tube resistance No no adjustments for change in patient airway resistance Clinically not effective
38 Proportional Assist Ventilation - Flow and/or volume PAV normal Disease Instantaneous effort Younes M. Am Rev Respir Dis 1992, 145:
39 Proportional Assist Ventilation - l Spontaneous breathing» Pmus = Pres + Pel Flow and/or volume PAV normal Disease Instantaneous effort» Pmus = R RS + V E RS Younes M. Am Rev Respir Dis 1992, 145:
40 Proportional Assist Ventilation - l Spontaneous breathing» Pmus = Pres + Pel Flow and/or volume PAV normal Disease Instantaneous effort l» Pmus = R RS + V E RS Supported spontaneous breathing» Pmus + P AW = Pres + Pel» Pmus + P AW = R + V T E Pmus = R + V T E P AW Equation of motion Younes M. Am Rev Respir Dis 1992, 145:
41 PAV application P = R + V T E (R-FA) + V T (E-VA) Normal R RS = 2 mbar/l/s E RS = 10 mbar/l COPD R RS = 10 mbar/l/s E RS = 10 mbar/l
42 PAV application P = R + V T E (R-FA) + V T (E-VA) Normal R RS = 2 mbar/l/s E RS = 10 mbar/l Normal Patient COPD R RS = 10 mbar/l/s E RS = 10 mbar/l Pmus = 2 + V T 10 Pmus = 10 + V T 10 Example Flow = 2 L/s V T = 0.5 L 9 mbar 25 mbar!!
43 PAV application P = R + V T E (R-FA) + V T (E-VA) Normal R RS = 2 mbar/l/s E RS = 10 mbar/l Normal Patient COPD R RS = 10 mbar/l/s E RS = 10 mbar/l Pmus = 2 + V T 10 Pmus = 10 + V T 10 Example Flow = 2 L/s V T = 0.5 L 9 mbar 25 mbar!! FA = 8 mbar/l/s, VA = 0 mbar/l P = (10-8) + V (10-0)
44 PAV application P = R + V T E (R-FA) + V T (E-VA) Normal R RS = 2 mbar/l/s E RS = 10 mbar/l Normal Patient ARDS R RS = 2 mbar/l/s E RS = 40 mbar/l Pmus = 2 + V T 10 Pmus = 2 + V T 40 Example Flow = 2 L/s V T = 0.5 L 9 mbar 24 mbar!! FA = 0 mbar/l/s, VA = 30 mbar/l Pmus = (2-0) + V (40-30)
45 PAV application ADVANTAGES Effective unloading of WoB Adjust to patient demand Improves patientventilator synchrony No trigger delay/ ineffective efforts LIMITATIONS runaway phenomenon Relies on measurement of R and E (difficult in spontaneous breathing) Needs to be adjusted to changes in R and E
46 PAV outcomes: sleep and Patient-ventilator interaction and sleep in mechanically ventilated patients: PAV vs. PS: 13 med-surg. Patients 22 days on MV, crossover. PAV arousals from 16 to 9/h (p<0.02) pat-vent. asynchrony Arousals /h and asynchrony /h correlate with each other (p<0.005) and with WoB Bosma K Crit Care Med 2007; 35:
47 PAV outcomes: sleep and Patient-ventilator interaction and sleep in mechanically ventilated patients: PAV vs. PS: 13 med-surg. Patients 22 days on MV, crossover. PAV arousals from 16 to 9/h (p<0.02) pat-vent. asynchrony Arousals /h and asynchrony /h correlate with each other (p<0.005) and with WoB Bosma K Crit Care Med 2007; 35:
48 PAV outcomes: Mechanical ventilation and weaning PAV with load-adjustable gain factors (PAV+) vs. PS in critically ill patients: 208 pts, 36h mech vent., Randomized for 48h. failure rate by 10% (OR 0.45) pat-vent. Dyssynchrony (5.6 vs. 29%) No difference in weaning success Xirouchaki ICM 2008; 34:
49 PAV outcomes: Mechanical ventilation and weaning PAV with load-adjustable gain factors (PAV+) vs. PS in critically ill patients: 208 pts, 36h mech vent., Randomized for 48h. failure rate by 10% (OR 0.45) pat-vent. Dyssynchrony (5.6 vs. 29%) No difference in weaning success Xirouchaki ICM 2008; 34:
50 Neurally Adjusted Ventilator Sinderby C. Nat Med 1999, 5:
51 Neurally Adjusted Ventilator Sinderby C. Nat Med 1999, 5:
52 NAVA - Application Invasive ventilation Noninvasive ventilation
53 NAVA - Application Invasive ventilation Noninvasive ventilation
54 NAVA - Application Invasive ventilation Noninvasive ventilation
55 NAVA - Application Invasive ventilation Noninvasive ventilation
56 NAVA - Application Invasive ventilation Noninvasive ventilation
57 NAVA application ADVANTAGES Effective unloading of WoB Adjust to patient demand In- / expiratory trigger Improves patientventilator synchrony No trigger delay/ ineffective efforts LIMITATIONS Additional enteral tube Trigger signal may be disturbed
58 NAVA - Outcomes Delisle et al. Annals of Intensive Care 2011, 1:42 Piquilloud et al. Intensive Care Med 2011; 37: Clement et al. Intensive Care Med 2011; 37:
59 NAVA - Outcomes NAVA improves the quality of sleep over PSV in terms of REM sleep (17% vs. 5%), fragmentation index (16 vs. 40/h) and ineffective efforts (0 vs. 24/h) in nonsedated adult ICU pts. (n=14) Delisle et al. Annals of Intensive Care 2011, 1:42 Piquilloud et al. Intensive Care Med 2011; 37: Clement et al. Intensive Care Med 2011; 37:
60 NAVA - Outcomes NAVA improves the quality of sleep over PSV in terms of REM sleep (17% vs. 5%), fragmentation index (16 vs. 40/h) and ineffective efforts (0 vs. 24/h) in nonsedated adult ICU pts. (n=14) NAVA improves patient ventilator interaction in 22 pts. with ALI(P/F 190 mmhg) and asynchrony, ineffective efforts, trigger delay and auto-triggering, but increased RR and double triggering. Delisle et al. Annals of Intensive Care 2011, 1:42 Piquilloud et al. Intensive Care Med 2011; 37: Clement et al. Intensive Care Med 2011; 37:
61 NAVA - Outcomes NAVA improves the quality of sleep over PSV in terms of REM sleep (17% vs. 5%), fragmentation index (16 vs. 40/h) and ineffective efforts (0 vs. 24/h) in nonsedated adult ICU pts. (n=14) NAVA improves patient ventilator interaction in 22 pts. with ALI(P/F 190 mmhg) and asynchrony, ineffective efforts, trigger delay and auto-triggering, but increased RR and double triggering. Neurally triggered breaths reduce trigger delay, improve ventilator response times, and may decrease work of breathing in children and during noninvsive ventilation. Delisle et al. Annals of Intensive Care 2011, 1:42 Piquilloud et al. Intensive Care Med 2011; 37: Clement et al. Intensive Care Med 2011; 37:
62 Comparison NAVA vs. PAV?? No compartive clinical studies available
63 Adaptive Support Ventilation - Pressure control / assist mode There is an optimum for V A to minimize work of breathing - RR - Tidal volume Otis et al., J Appl Physiol 1950; Meade et al. J Appl Physiol 1960; Campbell et al. Respir Care Clin N Am. 2001; 3:425-40
64 ASV - Outcomes Sulzer CF et al. Anesthesiology 2001 Dec; 95: Tassaux D, Critical Care Med 2002 Apr; 30: Arnal et al. Intensive Care Medicine 2008 Jan; 34(1): Dongelmans et al. Anesth Analg 2010;111:961 7
65 ASV - Outcomes Several studies on weaning post cardiac surgery, only 1 (ASV vs. SIMV) showed mechanical ventilation 4 h (median) Sulzer CF et al. Anesthesiology 2001 Dec; 95: Tassaux D, Critical Care Med 2002 Apr; 30: Arnal et al. Intensive Care Medicine 2008 Jan; 34(1): Dongelmans et al. Anesth Analg 2010;111:961 7
66 ASV - Outcomes Several studies on weaning post cardiac surgery, only 1 (ASV vs. SIMV) showed mechanical ventilation 4 h (median) ASV improves patient-ventilator interaction (vs. SIMV) Sulzer CF et al. Anesthesiology 2001 Dec; 95: Tassaux D, Critical Care Med 2002 Apr; 30: Arnal et al. Intensive Care Medicine 2008 Jan; 34(1): Dongelmans et al. Anesth Analg 2010;111:961 7
67 ASV - Outcomes Several studies on weaning post cardiac surgery, only 1 (ASV vs. SIMV) showed mechanical ventilation 4 h (median) ASV improves patient-ventilator interaction (vs. SIMV) Ventilation in ALI/ARDS is possible, but Failure in 20% (Pinsp > 35 mbar) 25% pts. V T > 8.8 ml PBW Sulzer CF et al. Anesthesiology 2001 Dec; 95: Tassaux D, Critical Care Med 2002 Apr; 30: Arnal et al. Intensive Care Medicine 2008 Jan; 34(1): Dongelmans et al. Anesth Analg 2010;111:961 7
68 ASV application ADVANTAGES Permits gradual withdrawl of mechanical ventilatory support? Effect in reduced physician availability LIMITATIONS Increases in tidal volume No proof of concept for underlying theorem (minimize WoB)
69 NeoGanesh (Smart Care TM ).. Patient Monitor Ventilator in PSV Patient Monitor Alarms.. Control Control Patient Input Automatedpressure support OutputAutomatedWeaning RR, TV, EtCO 2 Automated Automatic Weaning System Processing Made in Créteil JF Lellouche, Universite Laval, QC
70 Example of Weaning with «SmartCare» Automated reduction of the PSV level Level of Pressure support (cmh 2O) Minimum level of PS Message: «separation from ventilator» PEEP must be 5 cmh 2 O «Automated SBT» EX TU BA TI ON Time (h:min)
71 SmartCare does it work? Lellouche et al, AJRCCM 2006,174:
72 SmartCare does it work? Lellouche et al, AJRCCM 2006,174:
73 SmartCare does it work? Lellouche et al, AJRCCM 2006,174:
74 SmartCare does it work? Randomized Controlled Trial Medical patients 102 patients included Rose L et al. Intensive Care Med 2008; 34:1788 Schaedler D. AJRCCM 2009;
75 SmartCare does it work? Randomized Controlled Trial Medical patients 102 patients included Rose L et al. Intensive Care Med 2008; 34:1788 Schaedler D. AJRCCM 2009;
76 SmartCare does it work? Randomized Controlled Trial Medical patients 102 patients included Rose L et al. Intensive Care Med 2008; 34:1788 Schaedler D. AJRCCM 2009;
77 SmartCare - Outcomes WEAN pilot study Co-PI: K.Burns/F.Lellouche RCT PILOT/ FEASABILITY SmartCare vs written weaning protocols 8 Centers Primary outcome acceptance of weaning protocols
78 OUTCOME DATA Variables Protocol Weaning (n=43) Automated Weaning (n=51) p-value Time to first extubation, days median (25-75) 4 (2-12) 3 (2-5) 0.02 Time to first successful extubation, days median (25-75) 5 (3-19) 4 (2-7) 0.10 Reintubation, n (%) 11 (25.5%) 9 (17.7%) 0.35 Patients with prolonged ventilation (>21 days), n (%) 6 (18.2%) Ever had tracheostomy, n (%) 15 (34.9%) 8 (16%) 0.04 Total duration of intubation, days median (25-75) 10.5 (8, 17.5) 12 (6, 25) 0.37 Duration of ICU stay, days median (25-75) 9 (5, 25) 7 (5, 14) 0.13 Duration of Hospitalization, days median (25-75) 31.5 ( ) 22 (14, 33) 0.19 ICU death, n (%) 9 (20.9%) 9 (17.7%) 0.69
79 Conclusions
80 Conclusions Although there is a physiologic rational, there is no certainty that better synchrony translates into better patient outcomes
81 Conclusions Although there is a physiologic rational, there is no certainty that better synchrony translates into better patient outcomes New modes of ventilation provide better synchrony and have the potential to shorten the weaning phase with less physician attendence
82 Conclusions Although there is a physiologic rational, there is no certainty that better synchrony translates into better patient outcomes New modes of ventilation provide better synchrony and have the potential to shorten the weaning phase with less physician attendence Factors unclear: Who, When, how?
83 Thank you!
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