How are respiratory effort–related arousals (RERAs) measured in the evaluation of obstructive sleep apnea (OSA)?

Updated: Sep 15, 2020
  • Author: Himanshu Wickramasinghe, MD, MBBS; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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A reliable and valid way to measure RERAs is with the use of a nasal cannula and pressure transducer. Results obtained with this transducer are reliable. With regard to the diagnosis of OSA, this method does not differ from esophageal manometry in a clinically significant manner. With either method, the respiratory disturbance index (RDI) is greater than 5 and the normal RDI cutoff is greater than 15.

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