Influence Of Body Mass Index On The Apnea/hypopnea Index Of OSAHS Patients

Objective To investigate the influence of body mass index(BMI) on the apnea/hypopnea index(AHI) of patients with obstructive sleep apnea/hyponea syndrome (OSAHS).Mothods Patients with OSAHS were monitored by polysomnography continuously within seven hours. AHI changing between different body position was compared, and was regarded as good response when the ratio of AHI (that of lateral decubitus position/that of supine position) was less than 50%. AHI improvement during sleep body position changing between different BMI groups were compared.Results 80.8% of patients (21/26) in the group of normal BMI showed good response to body position changing,while only 58.1% (36/62) in the group of little-middle obesity and 27.3% (9/33) in the group of heavy obesity respectively, with significant difference to normal BMI group(P<0.05). Conclusion AHI improvements during sleep body position changing between different BMI groups were negative correlation to the BMI in patients with OSAHS.