Correlation between AHI and right ventricular diastolic function in patients with obstructive sleep apnea syndromeJunfang Li 1, MD, PhD, Changhong Lu2, MD, Zhibin Wang 1, MD, PhD1, Department of Echocardiography, Qingdao University Affiliated Hospital, Qingdao, 266001,China2, Department of Heart Center, Qingdao Fuwai Cardiovascular Hospital, Qingdao, 266034,ChinaCorresponding author: Zhibin Wang, Department of Echocardiography, Qingdao UniversityAffiliated Hospital, No. 16, Jiangsu Road, Qingdao 266001, China