Arquivos Brasileiros de Cardiologia
Print version ISSN 0066-782X
AZEVEDO, João Carlos Moreno de et al. Effects of the continuous positive airway pressure on the airways of patients with chronic heart failure. Arq. Bras. Cardiol. [online]. 2010, vol.95, n.1, pp. 115-121. Epub June 11, 2010. ISSN 0066-782X. http://dx.doi.org/10.1590/S0066-782X2010005000068.
BACKGROUND: Heart failure can present with asymptomatic dysfunction at decompensation, with limitations and decrease in the productive capacity. The Continuous Positive Airway Pressure (CPAP) is a non-pharmacological means to decrease afterload. OBJECTIVE: To analyze the effects of CPAP (10 cmH2O), for 30 days in patients with chronic heart failure. METHODS: We assessed 10 patients with heart failure (6 males, 4 females) of several etiologies, with a mean age of 54 ± 14 years, with a BMI of 21 ± 0.04 kg/m2. The therapy was applied for 60 min., 5 times a week for 30 days, during the daytime. The echocardiogram and the ergospirometry were analyzed, before and 30 days after the therapy. RESULTS: There was a 19.59% increase in the left ventricular ejection fraction (LVEF): 23.9 ± 8.91 vs 27.65 ± 9.56%; p = 0.045. At the ergospirometry, the exercise time (ET) showed a significant increase from 547 ± 151.319 vs 700 ± 293.990 sec., p = 0.02; oxygen consumption (VO2) was 9.59 ± 6.1 vs 4.51 ± 2.67 ml.kg-1.min.-1, p = 0.01, whereas the carbon dioxide production (VCO2) at rest (9.85 ± 4.38 vs 6.44 ± 2.88 ml.kg-1.min.-1, p = 0.03) decreased. CONCLUSION: The CPAP resulted in an increase in the LVEF and ET, decreased the oxygen consumption and the carbon dioxide production at rest.
Keywords : Continuous positive airway pressure; heart failure; echocardiography; oxygen consumption.