Journal Article

Combination of external chest wall oscillation with continuous positive airway pressure

S. E. Scholz, J. Sticher, G. Häufler, M. Müller, O. Böning and G. Hempelmann

in BJA: British Journal of Anaesthesia

Published on behalf of the British Journal of Anaesthesia

Volume 87, issue 3, pages 441-446
Published in print September 2001 | ISSN: 0007-0912
Published online September 2001 | e-ISSN: 1471-6771 | DOI: https://dx.doi.org/10.1093/bja/87.3.441
Combination of external chest wall oscillation with continuous positive airway pressure

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We studied the effects of continuous positive airway pressure (CPAP) on pulmonary gas exchange during external chest wall oscillation (ECWO), and the relationship with obesity, in nine patients with normal body weight (group ‘N’) and 10 obese patients (group ‘O’). During ECWO with CPAP 5, PaCO2 decreased in group ‘O’ (6.0 (sd 0.8) to 5.6 (0.5) kPa, P<0.05), whereas it increased in group ‘N’ at all levels (P<0.01). Arterial Po2 (P<0.001) was greater and PaCO2 (P<0.01) less in group ‘N’ during CPPV and ECWO plus CPAP. We also compared the haemodynamic effects of ECWO plus CPAP with those of continuous positive pressure ventilation (CPPV). ECWO plus CPAP and CPPV were applied for 30 min to 6 ASA III patients. Cardiac output (CI 2.7 (0.5) vs 2.1 (0.2) litre min–1 m–2, P<0.05) and stroke volume (SVI 49 (9) vs 32 (6) ml m–2, P<0.05) were greater during ECWO plus CPAP than with CPPV. ECWO is less effective in obese individuals than in those with normal body weight, and the effect of CPAP in overweight individuals is small.

Br J Anaesth 2001; 87: 441–6

Keywords: Keywords: airway, pressure; lung, gas exchange; complications, obesity; ventilation

Journal Article.  4747 words. 

Subjects: Anaesthetics

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