The video will explain about AHI by Dr. K K Aggarwal, President Heart Care Foundation of India and Group Editor in Chief MEDtalks. Apnea–Hypopnea Index is measured to indicate the severity of sleep apnea. He will explain the parameters of the study and the values according to the saturation levels. If AHI is more than 5 and is symptomatic then he needs treatment. And if the AHI is more than 15, then he needs treatment.