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Pulmonary hypertension in patients with severe obstructive sleep apnea

Abstract Thirty‐seven patients (35 men and two women) with obstructive sleep apnea–hypopnea syndrome (OSAHS) without any known cardiovascular and lung diseases were examined by Doppler echocardiography. Eight of the 37 (21.6%) patients experienced daytime pulmonary hypertension (PH), and all of them had severe OSAHS with an apnea–hypopnea index of > 30. The study suggested that one‐third of patients with severe OSAHS had daytime PH.