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Published in: Intensive Care Medicine 11/2009

01-11-2009 | Original

Impact of acute hypercapnia and augmented positive end-expiratory pressure on right ventricle function in severe acute respiratory distress syndrome

Authors: Armand Mekontso Dessap, Cyril Charron, Jérôme Devaquet, Jérôme Aboab, François Jardin, Laurent Brochard, Antoine Vieillard-Baron

Published in: Intensive Care Medicine | Issue 11/2009

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Abstract

Purpose

To evaluate the effects of acute hypercapnia induced by positive end-expiratory pressure (PEEP) variations at constant plateau pressure (P plat) in patients with severe acute respiratory distress syndrome (ARDS) on right ventricular (RV) function.

Methods

Prospective observational study in two academic intensive care units enrolling 11 adults with severe ARDS (PaO2/FiO2 <150 mmHg at PEEP >5 cmH2O). We compared three ventilatory strategies, each used for 1 h, with P plat at 22 (20–25) cmH2O: low PEEP (5.4 cmH2O) or high PEEP (11.0 cmH2O) with compensation of the tidal volume reduction by either a high respiratory rate (high PEEP/high rate) or instrumental dead space decrease (high PEEP/low rate). We assessed RV function (transesophageal echocardiography), alveolar dead space (expired CO2), and alveolar recruitment (pressure–volume curves).

Results

Compared to low PEEP, PaO2/FiO2 ratio and alveolar recruitment were increased with high PEEP. Alveolar dead space remained unchanged. Both high-PEEP strategies induced higher PaCO2 levels [71 (60–94) and 75 (53–84), vs. 52 (43–68) mmHg] and lower pH values [7.17 (7.12–7.23) and 7.20 (7.16–7.25) vs. 7.30 (7.24–7.35)], as well as RV dilatation, LV deformation and a significant decrease in cardiac index. The decrease in stroke index tended to be negatively correlated to the increase in alveolar recruitment with high PEEP.

Conclusions

Acidosis and hypercapnia induced by tidal volume reduction and increase in PEEP at constant P plat were associated with impaired RV function and hemodynamics despite positive effects on oxygenation and alveolar recruitment (ClinicalTrials.​gov #NCT00236262).
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Metadata
Title
Impact of acute hypercapnia and augmented positive end-expiratory pressure on right ventricle function in severe acute respiratory distress syndrome
Authors
Armand Mekontso Dessap
Cyril Charron
Jérôme Devaquet
Jérôme Aboab
François Jardin
Laurent Brochard
Antoine Vieillard-Baron
Publication date
01-11-2009
Publisher
Springer-Verlag
Published in
Intensive Care Medicine / Issue 11/2009
Print ISSN: 0342-4642
Electronic ISSN: 1432-1238
DOI
https://doi.org/10.1007/s00134-009-1569-2

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