Sleep Disordered Breathing in Precapillary Pulmonary Hypertension: Effect of CPAP Treatment

Inclusion Criteria: * minimum 18 years old * diagnosed with PAH or non-operable CTEPH or operated CTEPH with peristent pulmonary hypertension * diagnosis of PAH based on cardiac catherisation * diagnosis of CTEPH confirmed by contrast-enhanced spiral chest CT, pulmonary angiography and V/Q scintigraphy * recent diagnosis of sleep disordered breathing (polysomnography realized within 3 months before inclusion showing AHI above 15) stable clinical condition for at least 3 months before inclusion as defined by NYHA and a walking distance difference within 10% of the previous 3 months and no change in medical therapy during this 3 months Exclusion Criteria: * congenital heart disease * moderate and severe restrictive or obstructive pulmonary disease with a TLC and a FEV1\<60% of the predicted value * BMI 35kg/m2 or more * patients already treated with CPAP * patients with severe sleepiness (epworth sleepiness scale from 18 to 24/24)