Correlation of pulmonary hypertension severity with metrics of comorbid sleep-disordered breathing.

Purpose: We performed nocturnal polysomnography in patients with pulmonary hypertension (PH) of varying etiologies to determine the association of metrics describing sleep-disordered breathing (SDB) with measures of PH severity.

Methods: Consecutive patients referred for evaluation of dyspnea on exertion and elevated pulmonary arterial pressure >30 mmHg on echocardiography, who underwent right and left heart catheterization and polysomnography, were included. Patients were not pre-selected for symptoms of sleep-disordered breathing.