what is AHI
what is AHI The Apnea-Hypopnea Index (AHI) is a metric used in sleep medicine to quantify the severity of sleep apnea. Sleep apnea is a sleep disorder characterized by pauses in breathing or instances of shallow or infrequent breathing during sleep. The AHI is calculated by dividing the total number of apneas and hypopneas recorded during a sleep study (polysomnography) by the total number of hours of sleep, and then multiplying by 60. The formula for AHI is: � � � = ( � � � � � � � � � � � � � � + � � � � � � � � � � � � � � � � � ) � � � � � � � � � � � � � � ( � � ℎ � � � � ) × 60 A H I = T o t a l Sl ee p T im e ( in h o u rs ) ( N u mb er o f A p n e a s + N u mb er o f Hy p o p n e a s ) × 60 Here's what each component of the formula represents: Number of Apneas: The total count of complete cessation of airflow for at least 10 seconds. During apneas, there is no airflow, and this can result in oxygen desaturation and disturbances in sleep. Number of Hypop...