Pulmonary hypertension in newly diagnosed obstructive sleep apnea-chronic obstructive pulmonary disease overlap syndrome patients attending a tertiary care centre-a cross-sectional analysis.

This study confirms that OSA patients with modest daytime level of hypoxemia and mild-moderate chronic airflow limitation have a high prevalence of PH. Chronic airway obstruction may be asymptomatic in some subjects and this stresses the necessity of pulmonary function test in OSA.