Apnea hypopnea index ahi the ahi is the number of apneas or hypopneas recorded during the study per hour of sleep. An ahi of 30 or more events per hour children are less likely to have sleep apnea episodes. Pin On Sleepmatters These breathing events are also known as the apnea hypopnea index or ahi. Sleep apnea per hour . How many apneas per hour is normal. If the baseline ahi on the sleep study is quite high such as 100 events per hour even 10 events per hour may represent a significant improvement. This diagram shows what a normal healthy sleep with cpap treatment can look like. Distinguishing sleep apnea from normality the current definition of sleep apnea is 5 or more airflow drops per hour of sleep. 30 or more sleep apnea events per hour is classified as severe sleep apnea. Csa is usually due to an instability in the body s feedback mechanisms that control respiration. Based on the ahi the severity of osa is classified as follows. If you have minimal events y...