 In an attempt to yield further insight into this subject, we undertook a multicentre study to analyze the role of CPAP therapy optimal vs sham in the LVEF and in other cardiac measurements in patients with CHF.Aim. We evaluated in a randomized multicentre placebo sham-CPAP controlled study the effect of CPAP treatment on the left ventricle ejection fraction LVEF among other cardiological related variables. 