- Paper Report
- Open Access
BiPAP and the relief of CHF symptoms
- Michael Baram1
© Biomed Central Ltd 2001
- Published: 21 February 2001
In CHF, there are three goals to ventilatory support: to improve oxygenation; to decrease work of breathing; and to improve left ventricular function. BiPAP is a commonly used form of respiratory support in CHF. This study uses echocardiography to study hemodynamic effects of BiPAP in patients with depressed cardiac function.
. Of the 18 patients who volunteered, 14 tolerated BiPAP and completed the study
. Patients were used as their own control. All data were calculated as a change from their own baselines
. Patients underwent a baseline echocardiogram, then received BiPAP for 1 h at a setting of 5 cm of water inspiratory pressure and 3 cm of expiratory pressure
. After 1 h of BiPAP a second echocardiogram was performed. Finally, 1 h after BiPAP was discontinued, the echocardiogram was repeated a third time
Symptoms, cardiac output, end diastolic volume, pulses, and respiratory rate all improved after one hour of BiPAP. This was confirmed by echocardiogram. Although this study addresses more acute respiratory effects, it raises interesting questions about long term BiPAP use. Given that 1 h post-BiPAP there was still some improved cardiac output and decreased end-diastolic volume, what would the residual effects be of longer term BiPAP use? If improvements were seen after 1 h, what would the effect of overnight BiPAP be? Could overnight BiPAP decrease CHF symptoms during the day? Could BiPAP be used to treat CHF as well as sleep apnea?