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Critical Care
Published in: Critical Care 2/2011

01-04-2011 | Editorial

When pressure does not mean volume? Body mass index may account for the dissociation

Authors: Vito Fanelli, Marco V Ranieri

Published in: Critical Care | Issue 2/2011

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Abstract

Low tidal volume (VT 6 ml/predicted body weight) pressure limited (plateau pressure <30 cmH2O) protective ventilation as proposed by the ARDS Network was associated with an improvement in mortality and is considered the gold standard for acute respiratory distress syndrome (ARDS) ventilation strategies. Limiting plateau pressure minimizes ventilator-induced lung injury by reducing the trans-pulmonary pressure, which is the real alveolar distending pressure. However, in the presence of chest wall elastance impairment, as observed in obese patients, plateau pressure underestimates the trans-pulmonary pressure and derecrutiment at low distending pressure could occur. Moreover, low tidal volume to keep plateau pressure <30 cmH2O could be associated with large differences compared to measured total lung capacity. Quantitative bedside techniques that are able to measure lung volumes together with trans-pulmonary pressure could expand our chances to tailor mechanical ventilation in ARDS patients.
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Metadata
Title
When pressure does not mean volume? Body mass index may account for the dissociation
Authors
Vito Fanelli
Marco V Ranieri
Publication date
01-04-2011
Publisher
BioMed Central
Published in
Critical Care / Issue 2/2011
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/cc10077

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