![]() ![]() ![]() RDI measures not only apneas and hypopneas, but a third category, RERAs, or respiratory effort related arousals. However, for people with other sleep breathing concerns, such as upper airway resistance syndrome (UARS), RDI is one way to understand how problems with sleep breathing even without apneas or hypopneas can result in problematic sleep overall. This is less commonly discussed among sleep apnea patients because AHI is such a clear metric for understanding their disorder’s severity. RDI stands for Respiratory DisturbanceIndex (some people call it the Respiratory Distress Index). Together, the combination of both is referred to as “respiratory events.”Įxample: A person who has 50 apneas and 75 hypopneas over 6 hours’ time (360 minutes) has an AHI of 21.Īn AHI score of 21 means the patient has been shown to have, on average, 21 respiratory events per hour, which means they are likely to be diagnosed with moderate sleep apnea by their sleep specialist. This number tells them how many times (on average) they stop breathing during the night as they sleep as the result of apnea (complete obstruction of the upper airway) and hypopnea (partial obstruction of the upper airway). This is the more commonly understood term among obstructive sleep apnea (OSA) patients. So what is the difference between AHI and RDI? What is AHI?ĪHI stands for Apnea-Hypopnea Index. However, there are two which are of particular interest for those who have sleep breathing disorders.ĪHI and RDI both measure the quality of your breathing during sleep, but they technically count on different aspects of breathing in order to arrive at their numbers. FAST FACTS: How to make sense of your sleep study: AHI versus RDIĪll of them matter, to be sure. ![]()
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