Spontaneous breathing efforts. Laurent Brochard
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1 Spontaneous breathing efforts during ARDS ventilation Laurent Brochard
2 Conflicts of interest Our clinical research laboratory has received research grants for clinical research projects from the following companies: Maquet (NAVA) Covidien (PAV+) Dräger (SmartCare) General Electric (FRC) Respironics (NIV) Fisher Paykel (Optiflow)
3 Timing Chest Imaging a Origin of Edema Oxygenation b Acute Respiratory Distress Syndrome Within 1 week of a known clinical insult or new/worsening respiratory symptoms Bilateral opacities not fully explained by effusions, lobar/lung collapse, or nodules Respiratory failure not fully explained by cardiac failure or fluid overload; Need objective assessment (e.g., echocardiography) to exclude hydrostatic edema if no risk factor present Mild Moderate Severe 200<PaO 2 /FiO 2 < <PaO with 2 /FiO 2 <200 PaO 2 /FiO2<100 PEEP or CPAP with with 5 cmh 2 O c PEEP 5 cmh 2 O PEEP 5 cmh 2 O a Chest X-ray or CT Scan b If altitude higher than 1000m,correction factor should be made as follows: PaO 2 /FiO 2 x (barometric pressure/760) c This may be delivered non-invasively in the Mild ARDS group
4 Increasing Intensity of Intervention Ferguson N et al ICM 2012 ECMO ECCO 2 -R NIV Low Moderate PEEP Higher PEEP HFO Neuromuscular Blockade Prone Positioning Low Tidal Volume Ventilation Increasing Severity of Lung Injury Mild ARDS Moderate ARDS Severe ARDS PaO 2 /FiO 2
5 Why is spontaneous breathing desirable? Preserve Respiratory Muscle Function (avoid VIDD) Improve VA/Q and Regional Ventilation Levine S et al. N Engl J Med 2008;358:
6 PNO 4% vs 12% Papazian L. NEJM 2010
7 Modes of ventilation Controlled MV Assist Control? Bilevel Pressure Ventilation? Pressure Support ventilation?
8 Volume Assist-Control Flow (L/sec) Paw (cm H 2 O) Pes (cm H 2 O) Akouniamaki E et al CHEST in press
9 Presure Assist-Control Paw (cm H2O) Flow (L/sec) EAdi (µv) Akouniamaki E et al CHEST in press
10 Entrainment: reverse triggering Akouniamaki E et al CHEST in press
11 Spontaneous Breathing (CPAP) Not BiPap!! PCV
12
13 Assist-control Ventilation Volume vs. Pressure-targeted modes: what s the difference? Volume-control: TransPulmonary Pressure is controlled Pressure-control: TransPulmonary Pressure is NOT controlled
14
15 High and low Paw with APRV/BIPAP (white squares) and ACV (black circles). Daily ratio of PaO2 to FiO2 (grey columns cases and white columns controls)
16 Outcomes of patients included in the matched-case study Gonzales ICM 2010
17 Pressure-Preset Modes No i-synchronization APRV Partial i-synchronization BIPAP, DuoPAP, BiVent, Bilevel, etc. Full i-synchronization BIPAPassist,, BiPAP PS Assist Pressure controlled, etc. Akoumianaki E et al. ESICM 2012
18 VT (ml) VT (ml) VT (ml) VT change in the presence of spontaneous breaths according to i-synchronization 6ml/kg/IBW No spontaneous breaths time (sec) 10 ml/kg/ibw 6 ml/kg/ibw Fully i-synchronized modes 10 ml/kg/ibw 6 ml/kg/ibw 4 ml/kg/ibw Non Non i-synchronized i-synchronized modes modes
19 METHODS: settings Artificial lung settings C Rrs : 30ml/cmH 2 O R Rrs : 5 cmh 2 O/lt/min P mus : -10 cmh 2 O RR: 20, 30 br/min Ti: 0.8 sec Ventilator settings PAW insp : 30 cmh 2 O PEEP : 15 cmh 2 O RR: 15/min I:E ratios: 1:3 and 3:1
20 Tidal volume (ml) Coefficient of variation (%) RESULTS: I:E 1/3, RR No i-synchronization Partial i- Synchronization PS 0 Partial i- Synchronization PS 15 Full i-synchronization Tidal volume Coefficient of variation
21 Tidal volume (ml) Coefficient of variation (%) RESULTS: I/E 3:1, RR No i-synchronization Partial i-synchronization PS 0 Partial i-synchronization PS 15 Full i-synchronization 0 Tidal volume Coefficient of variation
22 Bench study: preliminary conclusions In the presence of spontaneous breathing the same settings across different Pressure-Preset modes lead to different values of V T, Ptp and breathing variability As i-synchronization increases, VT and Ptp increase while variability decreases These effects of i-synchronization are less pronounced at higher I:E ratio Clinicians should be aware that i-synchronization may be harmful when high VT is undesirable (ARDS)
23 JAMA 2008
24 BIPAP APRV (EXPRESS) at H24: Target sedation based on (SB) as a %of total Vmn total Delta Pressure for Vt 6 ml/kg
25 Patient DATA Trends
26 The mode of ventilation allowing SB may depend on the stage/severity of ARDS Early: controlled with NMBA, (no entrainment?) At 48h: non synchronous pressure targeted ventilation («APRV») Later: synchronous pressure targeted ventilation («Assist Pressure Control, Pressure Support Ventilation»)
27 Thank you!
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