Tidal lung hysteresis to interpret PEEP-induced changes in compliance in ARDS patients

被引：11

作者：

Mojoli, Francesco ^{[1
,2
]}

Pozzi, Marco ^{[2
]}

Arisi, Eric ^{[2
]}

Mongodi, Silvia ^{[2
]}

Orlando, Anita ^{[2
]}

Maggio, Giuseppe ^{[2
]}

Marzani, Federico Capra ^{[2
]}

Brochard, Laurent ^{[3
,4
]}

机构：

[1] Univ Pavia, Dept Clin Surg Diagnost & Pediat Sci, Unit Anesthesia, Pavia, Italy

[2] Fdn IRCCS Policlin S Matteo, Anesthesia & Intens Care, Pavia, Italy

[3] Unity Hlth Toronto, Li Ka Shing Knowledge Inst, Keenan Ctr Biomed Res, Toronto, ON, Canada

[4] Univ Toronto, Interdept Div Crit Care Med, Toronto, ON, Canada

来源：

CRITICAL CARE | 2023年 / 27卷 / 01期

关键词：

PEEP setting; Decremental PEEP trial; Tidal recruitment; Lung hysteresis; Lung recruitability; Pressure-volume curves; END-EXPIRATORY PRESSURE; RECRUITMENT; INJURY; VENTILATION; UNITS;

D O I：

10.1186/s13054-023-04506-6

中图分类号：

R4 [临床医学];

学科分类号：

1002 ; 100602 ;

摘要：

BackgroundIn ARDS, the PEEP level associated with the best respiratory system compliance is often selected; however, intra-tidal recruitment can increase compliance, falsely suggesting improvement in baseline mechanics. Tidal lung hysteresis increases with intra-tidal recruitment and can help interpreting changes in compliance. This study aims to assess tidal recruitment in ARDS patients and to test a combined approach, based on tidal hysteresis and compliance, to interpret decremental PEEP trials.MethodsA decremental PEEP trial was performed in 38 COVID-19 moderate to severe ARDS patients. At each step, we performed a low-flow inflation-deflation manoeuvre between PEEP and a constant plateau pressure, to measure tidal hysteresis and compliance.ResultsAccording to changes of tidal hysteresis, three typical patterns were observed: 10 (26%) patients showed consistently high tidal-recruitment, 12 (32%) consistently low tidal-recruitment and 16 (42%) displayed a biphasic pattern moving from low to high tidal-recruitment below a certain PEEP. Compliance increased after 82% of PEEP step decreases and this was associated to a large increase of tidal hysteresis in 44% of cases. Agreement between best compliance and combined approaches was accordingly poor (K = 0.024). The combined approach suggested to increase PEEP in high tidal-recruiters, mainly to keep PEEP constant in biphasic pattern and to decrease PEEP in low tidal-recruiters. PEEP based on the combined approach was associated with lower tidal hysteresis (92.7 +/- 20.9 vs. 204.7 +/- 110.0 mL; p < 0.001) and lower dissipated energy per breath (0.1 +/- 0.1 vs. 0.4 +/- 0.2 J; p < 0.001) compared to the best compliance approach. Tidal hysteresis >= 100 mL was highly predictive of tidal recruitment at next PEEP step reduction (AUC 0.97; p < 0.001).ConclusionsAssessment of tidal hysteresis improves the interpretation of decremental PEEP trials and may help limiting tidal recruitment and energy dissipated into the respiratory system during mechanical ventilation of ARDS patients.

引用

页数：10

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