Protective ventilation for ALL patients
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1 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, Italy
2 Conflicts of Interest I declare NO conflicts of interest
3 PROtective VEntilation NETWORK To perform Large multicenter clinical studies, randomized controlled trials, and meta-analyses
4
5 The ARDS Lung Lower lesion alveolar-capillary membrane ρ x g x h P= 5 cmh 2 O P = 10 cmh 2 O Higher lesion alveolar-capillary membrane PaO 2 /FiO 2 > 150 PaO 2 /FiO 2 < 150 LESS EDEMA-ATELECTASIS LOWER PEEP-LOWER MORTALITY HIGHER EDEMA-ATELECTASIS HIGHER PEEP-HIGHER MORTALITY
6 Ventilator Induced Lung Injury Slutsky AS & Ranieri VM N Engl J Med 2013;369: BAROTRAUMA VOLUTRAUMA BIOTRAUMA
7 Use of Lower Tidal Volumes Benefits Patients with ARDS Putensen C. Ann Internal Med. 2009; 151:566 No Low V T at similar PEEP High V T at similar PEEP Odds ratio 1,297 patients with ARDS from 6 RCTs outcome: hospital death Brochard 116 Brower 52 13/26 12/ [ ] Brower / / [ ] Stewart /60 28/ [ ] No Low V T + high PEEP High V T + low PEEP 0.75 [ ] Odds ratio Amato 53 13/29 17/ [ ] Villar 95 17/50 24/ [ ] 0.38 [ ] [METANALYSIS]
8 LungSafe Practice of Ventilation in ICUs Worldwide Bellani G JAMA Feb 23;315(8): international observational study 2,396 patients with mild, moderate or severe ARDS V T > 8 ml/kg in 40% of patients
9 Ventilation in Intensive Care Unit patients with Uninjured Lungs Ventilation in Intensive Care Unit patients with the Acute Respiratory Distress Syndrome (ARDS) mild ARDS moderate and severe ARDS Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Tidal volume size 6 8 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight 2 RCTs [4] and 1 meta analysis [5] 2 RCTs [4] and 1 meta analysis [5]
10 Use of Lower Tidal Volumes Benefits Patients without ARDS Serpa Neto A. Intensive Care Med. 2014; 40:950 2,184 ICU patients without ARDS from 7 studies outcome: duration of ventilation [METANALYSIS]
11 Use of Lower Tidal Volumes Benefits Patients without ARDS Serpa Neto A. Crit Care Med. 2015; 43:4155 2,184 ICU patients without ARDS from 7 studies outcome: hospital stay and ARDS development [METANALYSIS]
12 Use of Lower Tidal Volumes Benefits Patients without ARDS Serpa Neto A. Crit Care Med. 2015; 43:4155 Peak pressure = cmh 2 O Plateau pressure =16-19 cmh 2 O PEEP = 5-6 cmh 2 O PaO 2 /FiO 2 = 260 mmhg Volume controlled = 51% Pressure controlled = 49%
13 RANDOMIZED CONTROLLED TRIALS PRotective VENTilation in Patients Not Fulfilling the Consensus Definition for Moderate or Severe ARDS (PReVENT-NL) Academisch Medisch Centrum - Universiteit van Amsterdam (AMC-UvA). NCT NLM Identifier: NCT Pts without moderate or severe ARDS: V T 4 6 vs ml/kg PBW Preventive Strategies in Acute Respiratory Distress Syndrome (ARDS) (EPALI) Corporacion Parc Tauli. NCT NLM Identifier: NCT Pts without ARDS: V T 6 vs. 8 ml/kg PBW A new ARDS Network trial
14 PRoVENT Practice of Ventilation in ICUs Worldwide Serpa-Neto A et al. Lancet Respir Med Nov;4(11): international observational study 1,022 patients without ARDS 7.9 [ ] ml/kg PBW V T > 8 ml/kg in 40% of patients
15 Ventilation in Intensive Care Unit patients with Uninjured Lungs Ventilation in Intensive Care Unit patients with the Acute Respiratory Distress Syndrome (ARDS) mild ARDS moderate and severe ARDS Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Tidal volume size 6 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight 2 RCTs [31,32], 1 meta analysis and 2 IPD meta analyses [17,18,33]* 2 RCTs [4] and 1 meta analysis [5] 2 RCTs [4] and 1 meta analysis [5]
16 Experimental edema due to intermittent positive pressure ventilation with high inflation pressures Protection by PEEP Webb HH, Tierney DF Am Rev Respir Dis Nov;110(5): Ventilator Induced Lung Injury Tidal Volume or PEEP? P = 14 cmh2o PEEP = 0 cmh2o P = 45 cmh2o PEEP = 10 cmh2o P = 45 cmh2o PEEP = 0 cmh2o Lower Tidal Volume & Higher PEEP Higher Tidal Volume & Lower PEEP
17 Use of Higher PEEP Benefits Patient with Moderate or Severe ARDS Briel M. et al. JAMA 2010; 303:865 2,299 ICU patients with ARDS from 3 investigations outcome: death [METANALYSIS]
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20 Permissive atelectasis to minimize VILI Rocco PR et al. Curr Opin Anaesthesiol. 2012, 25(2): Cressoni M et al. Am J Respir Crit Care Med 2014,189(2): Cressoni M et al. Anesthesiology Feb 12. [Epub ahead of print] Stress σ = ΔF/ΔS (P L )) Energy = ΔP 2 x (2 x Est) Strain ε = ΔL/L 0 (V T /EELV) Power = Energy / Time ΔP = V T /Cst,rs = V T /EELV Healthy lungs Intensity = Power/Area Higher Dishomogeneities Less VILI with Less Stress, Strain, P, Power, Intensity
21 Biological Impact of Transpulmonary Driving Pressure in Experimental Acute Respiratory Distress Syndrome Samary CS et al. Anesthesiology Aug;123(2):
22 Biological Impact of Transpulmonary Driving Pressure in Experimental Acute Respiratory Distress Syndrome Samary CS et al. Anesthesiology Aug;123(2):
23 Biological Impact of Transpulmonary Driving Pressure in Experimental Acute Respiratory Distress Syndrome Samary CS et al. Anesthesiology Aug;123(2):
24 Ventilator-related causes of lung injury: The mechanical power Gattinoni L et al. Intensive Care Med 2016;42: % Increase in Power TV Flow P RR Power rs = * RR * V * (P peak ½ * P) PEEP % Increase in Equation Motion Components
25 Power and Biological Markers in Experimental ARDS Samary CS et al. Anesthesiology Nov;125(5):
26 The Biological Effects of Higher and Lower PEEP in Pulmonary and Extrapulmonary ALI with IAH Santos CL et al. Crit Care Jun 13;18(3):R121
27 Volutrauma leads to higher lung inflammation than atelectrauma in experimental ARDS Guldner A et al. Crit Care Med Sep;44(9):e V ml VOLUTRAUMA vs ATELECTRAUMA Comparable Tidal Volume and Driving Pressure * = C dyn UIP P 3ml/kg ATELECTRAUMA C dyn VOLUTRAUMA LIP 3ml/kg P cm H 2 O P
28 Volutrauma leads to higher lung inflammation than atelectrauma in experimental ARDS Guldner A et al. Crit Care Med Sep;44(9):e Static strain is more injurious than dynamic strain!
29 PEEP and Lymphatic drainage Pelosi P, Rocco PRM, de Abreu MG (Crit Care 2018 in press)
30 Recruitment (g) Aeration and Recruitment in ALI/ARDS at end- expiration and end-inspiration Gattinoni, Pelosi et al. Am J Respir Crit Care Med 1995; 151: ± 1.8 ** Plateau Pressure (cmh 2 O) 26 ± 1.4 End Expiration End Inspiration ** 31 ± 1.8 ** PEEP (cmh 2 O) 38 ± ± 3.2
31 PEEP of 15 cmh 2 O does not reduce lung inhomogeneities in ARDS Cressoni M et al. Intensive Care Med Mar 10. [Epub ahead of print] The clinical question is: Atelectrauma is less harmful than volutrauma due to a further increase of PEEP?
32 1. Increased capillary pressure 2. Impeded drainage (compression thoracic duct) PEEP RV LV PEEP PEEP P v plasma capillaries edema Lymph flow (thoracic duct) Courtesy Prof Hedenstierna
33 Impact of acute hypercapnia and augmented PEEP on right ventricle function in ARDS Dessap AM et al Intensive Care Med (2009) 35: Boufferace K et al. Current Opinion in Critical Care 2011,17:30 35
34 PEEP in ARDS The Lung Safe Study Bellani G et al. JAMA Feb , 315 (8): PEEP was relatively low (12 cmh 2 O or lower) independently from ARDS severity Hypoxemia was treated by increasing FiO 2 Severe ARDS 8.4 cm H 2 O
35 PEEP: High vs Low - RCTs 60-day mortality (%) P = 0.29 ALVEOLI LOVS EXPRESS N = 545 N = 983 N = 767 Low PEEP P = 0.17 P = 0.22 High PEEP
36 Effect of Lung Recruitment and Titrated Positive End-Expiratory Pressure (PEEP) vs Low PEEP on Mortality in Patients With ARDS Costa Leme A et al. JAMA Apr 11;317(14): PEEP 12 vs 16 cmh 2 O
37 The Funeral for Positive End-Expiratory Pressure better known as PEEP It was a dream for generations of anesthesiologists and intensivists PEEP Rest in Peace
38 Lung Recruitability Is Better Estimated According to the Berlin Definition of ARDS at Standard 5 cm H 2 O PEEP: A Retrospective Cohort Study Caironi P. et al. Crit Care Med 2015; 43: PEEP 5-8 cmh 2 O PEEP 8-12 cmh 2 O PEEP cmh 2 O
39 Bedside Selection of PEEP in Mild, Moderate, and Severe Acute Respiratory Distress Syndrome Chiumello D. et al. Crit Care Med 2014; 42: SatO PaO mmhg No routine RMs!
40 Prone position homogenizes aeration and ventilation at low PEEP Supine 7 6 Lung inflation Lung Height (%) Gattinoni, Pelosi et al. Anesthesiology 1991; 74(1):15-23 Prone PEEP = 10 cmh 2 O P/F<150 mmhg while on F I O 2 >0.60; Guerin C. et al. N Engl J Med Jun 6;368(23):
41 Ventilation in Intensive Care Unit patients with Uninjured Lungs Ventilation in Intensive Care Unit patients with the Acute Respiratory Distress Syndrome (ARDS) mild ARDS moderate and severe ARDS Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Tidal volume size 6 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight 2 RCTs [31,32], and 1 3 meta analyses meta analysis [17,18,33]* and 2 IPD meta analyses [17,18,33]* evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] Level of PEEP 5 10 cm H 2 O Level of PEEP 10 cm H 2 O but < 15cmH 2 O 3 RCTs [7,8,9] and 1 IPD meta analysis [10] 4 RCTs [7,8,9] and 1 IPD meta analysis [10]
42 In non ARDS patients lower VT + lower PEEP are associated with a shorter length of ICU stay Guo L et al. Critical Care (2016) 20:226 Serpa Neto A et al. Ann Intensive Care Dec;6(1):109 MD <0 favors strategy A (Low V T /Low PEEP)
43 Associations between PEEP and outcome of patients without ARDS at onset of ventilation:a systematic review and meta-analysis of randomized controlled trials Serpa Neto et al. Ann. Intensive Care (2016) 6:109 Low PEEP = 2.0 ± 2.8 cmh 2 O High PEEP = 9.7 ± 4.0 cmh 2 O High PEEP: No effect on duration of MV Lower rate of ARDS (high I 2 )
44 PRoVENT Practice of Ventilation in ICUs Worldwide Serpa-Neto A et al. Lancet Respir Med Nov;4(11): international observational study 1,022 patients without ARDS PEEP > 5 cmh 2 O in 60-40% of patients
45 Ventilation During General Anesthesia for Surgery Ventilation in Intensive Care Unit patients with Uninjured Lungs Ventilation in Intensive Care Unit patients with the Acute Respiratory Distress Syndrome (ARDS) mild ARDS moderate and severe ARDS Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Tidal volume size 6 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight 2 RCTs [31,32], and 1 3 meta analyses meta analysis [17,18,33]* and 2 IPD meta analyses [17,18,33]* evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] Level of PEEP (<10 cmh 2 O)?? Level of PEEP 5 10 cm H 2 O Level of PEEP 10 cm H 2 O but < 15cmH 2 O Convincing RCT evidence is lacking 1 meta analysis 3 RCTs [7,8,9] and 1 IPD meta analysis [10] 3 RCTs [7,8,9] and 1 IPD meta analysis [10]
46 Driving Pressure ( P,rs) Bluth T et al. Curr Opin Anaesthesiol Jun;29(3): V'aw ml/s Vol ml P = Pplat,rs PEEP = V 200 T /Cst = V T /EELV Paw cmh2o PEEPtot Pplat Time (s) P,rs
47 Driving pressure and survival in the ARDS c Amato MBP, et al. N Engl J Med 2015;372:747-55
48 LungSafe Practice of Ventilation in ICUs Worldwide Bellani G JAMA Feb 23;315(8): ,396 pts with mild, moderate or severe ARDS
49 IPD Metaanalysis of studies in ARDS patients Receiving ELS Serpa-Neto A et al Intensive Care Med Nov;42(11): c 653 patients from 12 studies RR for hospital death median settings in the first 3 days V T, ml/kg PBW PEEP, cm H 2 O Pplat, cm H 2 O ΔP, cm H 2 O ALL N = 653 ECMO N = 545 RR [95% CI] (p value) for hospital death 0.97 [ ] (p = 0.602) 0.97 [ ] (p = 0.249) 1.03 [ ] (p = 0.298) 1.07 [ ] (p = 0.004) 0.94 [ ] (p = 0.294) 0.97 [ ] (p = 0.323) 1.03 [ ] (p = 0.308) 1.06 [ ] (p = 0.029) ECCO 2 R N = [ ] (p = 0.817) 0.92 [ ] (p = 0.125) 0.94 [ ] (p = 0.454) 1.19 [ ] (p = 0.009) adjusted for risk of death, age and severity of ARDS [METANALYSIS]
50 Ventilation in Intensive Care Unit patients with Uninjured Lungs Ventilation in Intensive Care Unit patients with the Acute Respiratory Distress Syndrome (ARDS) mild ARDS moderate and severe ARDS Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Tidal volume size 6 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight 2 RCTs [31,32], and 1 3 meta analyses meta analysis [17,18,33]* and 2 IPD meta analyses [17,18,33]* evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] Level of PEEP (< 10 cmh 2 O)?? Level of PEEP 5 10 cm H 2 O Level of PEEP 10 cm H 2 O but < 15cmH 2 O Convincing RCT evidence is lacking 1 meta analysis 3 RCTs [7,8,9] and 1 IPD meta analysis [10] 3 RCTs [7,8,9] and 1 IPD meta analysis [10] Low driving pressure (< 13cmH 2 O) Low driving pressure (< 13cmH 2 O) suggestion comes from several studies and 1 IPD meta analysis [10] suggestion comes from several studies and 1 IPD meta analysis [10]
51 PRoVENT Practice of Ventilation in ICUs Worldwide Serpa-Neto A et al. Lancet Respir Med Nov;4(11): international observational study 1,022 patients without ARDS Driving pressure associated with mortality
52 PRoVENT Practice of Ventilation in ICUs Worldwide Serpa-Neto A et al. Lancet Respir Med Nov;4(11): international observational study 1,022 patients without ARDS P 10.0 [6.0-13] cm H 2 O P > 12 cmh 2 O in 30-40% of patients
53 Ventilation in Intensive Care Unit patients with Uninjured Lungs Ventilation in Intensive Care Unit patients with the Acute Respiratory Distress Syndrome (ARDS) mild ARDS moderate and severe ARDS Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Tidal volume size 6 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight 2 RCTs [31,32], and 1 3 meta analyses [17,18,33]* and 2 IPD meta analyses [17,18,33]* evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] Level of PEEP (<10 cmh 2 O)?? Level of PEEP 5 10 cm H 2 O Level of PEEP 10 cm H 2 O but < 15cmH 2 O Convincing RCT evidence is lacking 1 meta analysis 3 RCTs [7,8,9] and 1 IPD meta analysis [10] 3 RCTs [7,8,9] and 1 IPD meta analysis [10] Driving pressure (< 13cmH 2 O) studies are lacking Low driving pressure (< 13cmH 2 O) suggestion comes from several studies and 1 IPD meta analysis [10] Low driving pressure (< 13cmH 2 O) suggestion comes from several studies and 1 IPD meta analysis [10]
54 LungSafe Practice of Ventilation in ICUs Worldwide Bellani G JAMA Feb 23;315(8): Pplat and Mortality in ARDS international observational study 2,396 patients with mild, moderate or severe ARDS
55 Plateau pressure or Driving Pressure and Survival in the ARDS Villar J et al. Crit Care Med Mar 1 [Epub ahead of print]
56 LungSafe Practice of Ventilation in ICUs Worldwide Bellani G JAMA Feb 23;315(8): ,396 pts with mild, moderate or severe ARDS
57 LungSafe Potentially modifiable factors contributing to outcome from ARDS Laffey GC et al. Intensive Care Med 2016 (Epub Ahead of Print) 2,396 pts with mild, moderate or severe ARDS Higher PEEP, lower plateau and driving P, & lower respiratory rate are associated with better survival from ARDS
58 Ventilation in Intensive Care Unit patients with Uninjured Lungs Ventilation in Intensive Care Unit patients with the Acute Respiratory Distress Syndrome (ARDS) mild ARDS moderate and severe ARDS Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Tidal volume size 6 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight 2 RCTs [31,32], and 1 3 meta analyses meta analysis [17,18,33]* and 2 IPD meta analyses [17,18,33]* evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] Level of PEEP (< 6 cmh 2 O)?? Level of PEEP 5 10 cm H 2 O Level of PEEP 10 cm H 2 O but < 15cmH 2 O Convincing RCT evidence is lacking 1 meta analysis 3 RCTs [7,8,9] and 1 IPD meta analysis [10] 3 RCTs [7,8,9] and 1 IPD meta analysis [10] Driving pressure (< 13cmH 2 O) studies are lacking Driving pressure (< 13cmH 2 O) Pplat (< cmh 2 O) suggestion comes from several studies and 1 IPD meta analysis [10] Driving pressure (< 13cmH 2 O) Pplat (< cmh 2 O) suggestion comes from several studies and 1 IPD meta analysis [10]
59 Management and Outcome of Mechanically Ventilated in Patients after Cardiac Arrest Sutherasan Y et al. Crit Care May 8;19:215 Factors associated with ARDS 1) Higher (> 17 cmh 2 O) plateau pressure (odds ratio 1.12, 95% CI interval 1.04 to 1.21) Factors associated with ICU acquired pneumonia 1) Higher tidal volume (odds ratio 1.003, 95% CI to 1.01) 2) Higher (>5 cmh 2 O) applied PEEP levels (odds ratio 0.89, 95% CI 0.80 to 0.99)
60 PRoVENT Practice of Ventilation in ICUs Worldwide Serpa-Neto A et al. Lancet Respir Med Nov;4(11): international observational study 1,022 patients without ARDS Pplat 15.0 [ ] cm H 2 O Pplat > 17 cmh 2 O in 30-40% of patients
61 Ventilation During General Anesthesia for Surgery Ventilation in Intensive Care Unit patients with Uninjured Lungs Ventilation in Intensive Care Unit patients with the Acute Respiratory Distress Syndrome (ARDS) mild ARDS moderate and severe ARDS Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Protective ventilation includes: Tidal volume size 6 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight Tidal volume size 6 8 ml/kg predicted body weight 2 RCTs [31,32], and 1 3 meta analyses meta analysis [17,18,33]* and 2 IPD meta analyses [17,18,33]* evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] evidence 2 RCTs comes [4] and from 1 meta analysis 2 RCTs [4] and [5] 1 meta analysis [5] Level of PEEP (< 6 cmh 2 O)?? Level of PEEP 5 10 cm H 2 O Level of PEEP 10 cm H 2 O but < 15cmH 2 O Convincing RCT evidence is lacking 1 meta analysis 3 RCTs [7,8,9] and 1 IPD meta analysis [10] 3 RCTs [7,8,9] and 1 IPD meta analysis [10] Driving pressure (< 13cmH 2 O) Plateau pressure (< 17 cmh 2 O)?? studies are lacking Driving pressure (< 15 cmh 2 O) Pplat (< cmh 2 O) suggestion comes from several studies and 1 IPD meta analysis [10] Driving pressure (< 15 cmh 2 O) Pplat (< cmh 2 O) suggestion comes from several studies and 1 IPD meta analysis [10]
62 Practice of Ventilation in ARDS Bellani G JAMA Feb 23;315(8):
63 Practice of Ventilation in ICUs Serpa-Neto A et al. Lancet Respir Med Nov;4(11):
64 Permissive Atelectasis in ALL MV patients Pelosi P, Rocco PRM, de Abreu MG (Crit Care 2018 in press) Expiration Inspiration
65 Permissive Atelectasis! Less is More P = Pplat,rs PEEP = V T /Cst = V T /EELV V T / P Energy = ( P) 2 / (2 x Est) Pplat Energy Power Power = Energy / Time (RR) PEEP Regional Intensity = Power / Surface
66 Permissive Atelectasis! Less is More P = Pplat,rs PEEP = V T /Cst = V T /EELV V T / P Energy = ( P) 2 / (2 x Est) Pplat Energy Power In ARDS patients PEEP based on lower PaO 2 /FiO 2 Table PRONE POSITION! PEEP Power = Energy / Time (RR) Regional Intensity = Power / Surface
67 JUST DO IT! Protective Mechanical Ventilation In ALL patients LOWER IS BETTER...ALSO PEEP in severe ARDS!
Difficult Ventilation in ARDS Patients
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