Abstract
Apnea–Hypopnea Index. AHI <5—Normal, Snoring, or Upper Airway Resistance Syndrome (UARS). AHI 5–15—Mild Sleep Apnea. AHI 15–30—Moderate Sleep Apnea. AHI >30—Severe Sleep Apnea. Sleep Syndromes: Snoring. Upper airway resistance syndrome: daytime hypersomnolence, normal PSG. Obstructive sleep apnea syndrome: daytime hypersomnolence. Apnea and hypopnea (AHI >5). Definitions: Apneic event: cessation of ventilation for 10 s or longer leading to an arousal. Hypopneic event: a decrease in airflow of 30 % with a 4 % decrease in oxygen saturation or a 50 % decrease in airflow with a 3 % decrease in oxygen saturation. Respiratory effort-related arousal (RERA): absence of apnea–hypopnea with a 10 s or more duration of progressive negative esophageal pressure leading to an arousal or microarousal. Apnea Index (AI): number of apneas in an hour period. Respiratory distress index (RDI): number of apneas, hypopneas, and Rera’s in an hour. No longer used in defining sleep apnea
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Olarte, L., Lin, F.Y. (2014). Sleep-Disordered Breathing and Obstructive Sleep Apnea. In: Lin, F., Patel, Z. (eds) ENT Board Prep. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8354-0_9
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