Each pause can last for a few seconds to a few minutes and they happen many times a night. Apnea hypopnea index ahi measures sleep apnea severity. 10 Worthy Cool Ideas How To Stop Snoring Immediately Home Sleep apnea is a serious sleep disorder that occurs when a person s breathing is interrupted during sleep people with untreated sleep apnea stop breathing repeatedly during their sleep sometimes. What is ahi with sleep apnea . It is generally expressed as the number of events per hour. The test can show if you have sleep apnoea and how severe it is. The apnea hypopnea index ahi is a scale that tells whether you have a sleep disorder called apnea and if so how serious it is. There may be a choking or snorting sound as breathing resumes. The apneas pauses in breathing must last for at least 10 seconds and be associated with a decrease in blood oxygenation. The use of continuous positive airway pressure cpap is appropriate for mild moderate or severe sleep apnea. Sl...