High Frequency Ventilation. Neil MacIntyre MD Duke University Medical Center Durham NC USA
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1 High Frequency Ventilation Neil MacIntyre MD Duke University Medical Center Durham NC USA
2 High frequency ventilation Concept of ventilator induced lung injury and lung protective ventilatory strategies Why HFOV may be an important lung protective strategy: Gas transport mechanisms Airway (and alveolar) pressure profiles Outcome data
3 High frequency ventilation Concept of ventilator induced lung injury and lung protective ventilatory strategies Why HFOV may be an important lung protective strategy: Gas transport mechanisms Airway (and alveolar) pressure profiles Outcome data
4 Preventing Overdistention and Under-Recruitment Injury Lung Protective Ventilation V O L U M E Add PEEP Limit VT Pressure Limit Distending Pressure
5 PEEP = 5 mbar Pinsp = 40 mbar
6 Lung Protective Ventilator Strategies V zone of derecruitment and atelectasis zone of overdistension "safe" window volutrauma UIP LIP atelectrauma P
7 High frequency ventilation Concept of ventilator induced lung injury and lung protective ventilatory strategies Why HFOV may be an important lung protective strategy: Gas transport mechanisms Airway (and alveolar) pressure profiles Outcome data
8 High frequency ventilation Breathing frequencies > normal. In adult bpm. Need special devices: Jets Oscillators Small tidal volumes (usually smaller than anatomic dead space) Gas transport by non-convective mechanisms
9
10
11 Mechanisms of gas transport when Vt << Vd A turbulent gas wavefront will disperse forward (Taylor dispersion). An oscillating column of gas in a branched system will have the center move distal and the periphery move proximal ( coaxial flow ) In distal lung regions, vibrating gas will facilitate molecular diffusion Pendelluft action
12
13 HFV gas transport mechanisms
14 When Vt << Vd, the conventional V A = f x (Vt - Vd) makes no sense. An alternate formula is thus necessary:
15 Airway pressures damped with HFOV Inside machine Endotracheal tube Alveolar regions
16 HFV CPAP with a wiggle Overdistend Protected Under-recruit
17
18 HFV CPAP with a wiggle Overdistend CAN HFV RAISE THIS? Protected Under-recruit
19 Can the injury threshold of cm H2O be raised if applied slowly enough? Injury Scores: Hi = 12.5, Low = 2.1 Slo flow = 1.9
20
21 HFV CPAP with a wiggle Overdistend CAN HFV RAISE THIS? Protected Under-recruit
22 High frequency ventilation Concept of ventilator induced lung injury and lung protective ventilatory strategies Why HFOV may be an important lung protective strategy: Gas transport mechanisms Airway (and alveolar) pressure profiles Outcome data
23 RCTs: HFV vs CV in pediatric/neonatal patients Author Device Patients Main outcomes (HFV vs CV) Kinsella HFO 205 PPHN Improved PO2 (with NO) Gerstman HFO 125 RDS Improved PO2, lower chronic dz Clark HFO 79 RDS Fewer treatment failures with HFO Clark HFO 83 RDS Less chronic dz Carlo HFJV 42 RDS No difference Keszler HFJV 130 RDS Less chronic dz Keszler HFO 144 PIE Faster PIE resolution, better survival HIFI HFO 673 RDS More IVH with HFO Johnson HFO 400 RDS No difference Courtney HFO 500 RDS Less chronic dz
24 HFV vs CV: Adults Author Device Patients Design Main outcomes (HFV vs CV) Carlon HFJV 300 ARF RCT Lower PeakP, same survival MacIntyre HFJV 58 ARF Xover Lower PeakP, same PO2 Gluck HFJV 90 ARDS Xover Lower PeakP, better PO2 Forte HFO 18 ARDS Xover Same gas exchange Mehta HFO 24 ARDS Xover Better PO2, higher meanp
25 HFV: CPAP with a wiggle MOAT Trial*: pts ARDS - RCT - HFO v CV - HFO mean P +5 Rate 300 bpm I:E 1:3 - CV Vt 10/kg IBW *Derdak. AJRCCM 2002
26 P = 0.057
27 HFV in ALI/ARDS: 2010 Meta-analysis From the Canadian EBM group 8 RCTs (6 more since meta-analysis of 2004) 419 pediatric and adult patients (n= ) 6/8 <48hrs of ARDS Initial settings: 4-10Hz, 3-5 cm H2O mean P above conventional Control: 5/8 ARDSnet BMJ 2010; 340:2327
28 Mortality BMJ 2010; 340:2327
29 Treatment Failure BMJ 2010; 340:2327
30 BMJ 2010; 340:2327
31 HFV in ALI/ARDS: 2010 Meta-analysis Key results from 6 peer reviewed studies: Mortality reduced (RR 0.77, P=0.03), 5/6 trials + Treatment failures (RR 0.67, P=0.04), 5/6 trials + Barotrauma (RR 0.68, P=0.2) Physiology: Consistently better PaO2/FiO2 BMJ 2010; 340:2327
32 OSCAR 29 hospitals, 20 with no HFO experience 795 pts meeting ARDS criteria Novalung R100 (Metran) never used before Initial: 10 Hz, mean P = plateau + 5 Control encouraged to use ARDSnet 30 day mortality 41.7% (HFO) vs 41.1% (CV) NEJM 2013
33 OSCILLATE 41 hospitals, many with no HFO experience 548 pts meeting ARDS criteria (75 already on HFO and excluded) Sensormedics 3100b (CareFusion) Initial: RM, then 30; Up to 10Hz Control: Protocolized LOVS/ARDSnet In hospital mortality: 47% (HFO) vs 35% (CV) NEJM 2013
34 Comparing Trials Meta Analysis OSCAR OSCILLATE Age Baseline P/F Initial HFO P 5+CVm (25) 5+CVm (27) 31 Vasoactive needs HFO mortality 39* CV mortality * Note: Mortality in 4188 ventilated ARDS patients with new Berlin criteria: Mild (P/F ) 24-32%; Moderate (P/F ) 29-34% Severe (P/F <100) 42-48% JAMA 2012;307:2526
35 OSCAR and OSCILLATE Trials 2 large RCTs OSCAR equivalent, OSCILLATE suggested harm Concerns (both): HFO expertise low (majority had never used HFO) Best candidates excluded (75 subjects in OSCILLATE on HFO) Concerns (OSCILLATE) High Paw protocol in setting of high vasopressor use My take: Should not expose pts with adequate lung protection on CV to risks of HFO (fluid balance, NMBs) Clinician skill important especially with high mean P and hemodynamic compromise Still a reasonable rescue strategy
36 HFV in the adult -when to use? Suggested criteria - when lung protection cannot be provided with conventional strategies: Pplat (corrected for Ccw) > 30 FiO2 > Earlier rather than later
37
38 PaCO2 (mmhg) ph Time after start of HFOV (h) Time after start of HFOV (h) Oxygenation Index Time after start of HFOV (h)
39 High frequency ventilation Concept of ventilator induced lung injury and lung protective ventilatory strategies Why HFOV may be an important lung protective strategy: Gas transport mechanisms Airway (and alveolar) pressure profiles Outcome data
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