Published in:
01-10-2003 | Original
Helium-oxygen reduces work of breathing in mechanically ventilated patients with chronic obstructive pulmonary disease
Authors:
Marc Gainnier, Jean-Michel Arnal, Patrick Gerbeaux, Stéphane Donati, Laurent Papazian, Jean-Marie Sainty
Published in:
Intensive Care Medicine
|
Issue 10/2003
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Abstract
Objective
To evaluate whether helium-oxygen mixture reduces inspiratory work of breathing (WOB) in sedated, paralyzed, and mechanically ventilated patients with acute exacerbation of chronic obstructive pulmonary disease (COPD).
Design and setting
Open, prospective, randomized, crossover study in the medical intensive care unit in a university hospital.
Patients and participants
23 patients admitted for acute exacerbation of COPD and mechanically ventilated.
Measurements
Total WOB (WOBt), elastic WOB (WOBel), resistive WOB (WOBres), and WOB due to PEEPi (WOBPeepi) were measured. Static intrinsic positive end expiratory pressure (PEEPi), static compliance (Crs), inspiratory resistance (Rins), inspiratory (tinsp) and expiratory time constant (texp) were also measured. These variables were compared between air-oxygen and helium-oxygen mixtures.
Results
WOBt significantly decreased with helium-oxygen (2.34±1.04 to 1.85±1.01 J/l, p<0.001). This reduction was significant for WOBel (1.02±0.61 J/l to 0.87±0.47, p<0.01), WOBPeepi (0.77±0.38 J/l to 0.54±0.38, p<0.001), and WOBres (0.55±0.19 J/l to 0.44±0.24, p<0.05). PEEPi, Rins, tinsp and texp significantly decreased. Crs was unchanged.
Conclusions
Helium-oxygen mixture decreases WOB in mechanically ventilated COPD patients. Helium-oxygen mixture could be useful to reduce the burden of ventilation.