The aim of the present study was to investigate the effects of CPAP (continuous positive airway pressure) support on myocardial energetics in patients with CHF (congestive heart failure). CPAP has been shown to decrease left ventricular afterload and to produce favourable short- and long-term haemodynamic and neurohormonal benefits in CHF patients. The mechanisms responsible for these actions are not completely understood. We measured the haemodynamic and myocardial metabolic response to the acute (10 min) application of CPAP in CHF patients. Myocardial VO2 (O2 consumption) and VCO2 (CO2 production) were measured by simultaneous arterial and coronary sinus blood sampling. The application of CPAP resulted in a significant decrease in left ventricular stroke work (97±12 to 83±9 g·m; P<0.05) and myocardial VO2 (0.32±0.03 to 0.25±0.01 ml of O2/beat; P<0.05). Myocardial mechanical efficiency, however, was unchanged. CPAP application decreases myocardial work and VO2. This effect on myocardial energetics could account for some of the favourable effects of CPAP in CHF patients.
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Research Article|
June 01 2004
Continuous positive airway pressure decreases myocardial oxygen consumption in heart failure
David M. KAYE;
*Wynn Department of Metabolic Cardiology, Baker Heart Research Institute, St Kilda Rd Central, Melbourne, VIC 8008, Australia
†Department of Cardiovascular Medicine, Alfred Hospital, Commercial Rd, Prahran, VIC 3181, Australia
Correspondence: Professor David M. Kaye (e-mail [email protected]).
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Darren MANSFIELD;
Darren MANSFIELD
‡Department of Respiratory Medicine Alfred Hospital, Commercial Rd, Prahran, VIC 3181, Australia
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Matthew T. NAUGHTON
Matthew T. NAUGHTON
‡Department of Respiratory Medicine Alfred Hospital, Commercial Rd, Prahran, VIC 3181, Australia
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Publisher: Portland Press Ltd
Received:
August 08 2003
Revision Received:
December 23 2003
Accepted:
February 03 2004
Accepted Manuscript online:
February 03 2004
Online ISSN: 1470-8736
Print ISSN: 0143-5221
© 2004 The Biochemical Society
2004
Clin Sci (Lond) (2004) 106 (6): 599–603.
Article history
Received:
August 08 2003
Revision Received:
December 23 2003
Accepted:
February 03 2004
Accepted Manuscript online:
February 03 2004
Citation
David M. KAYE, Darren MANSFIELD, Matthew T. NAUGHTON; Continuous positive airway pressure decreases myocardial oxygen consumption in heart failure. Clin Sci (Lond) 1 June 2004; 106 (6): 599–603. doi: https://doi.org/10.1042/CS20030265
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