What is obstructive sleep apnea?

OSA, sleep interruption due to repetitive upper airway narrowing or collapse. Breathing events seen during sleep testing (apneas or hypopneas) may be divided by total sleep seen with apnea-hypopnea Index (AHI) AHI [5-14] / hour -->mild OSA AHI [15-30] / hour -->moderate OSA AHI >30 / hour --> severe OSA But sleepiness degree is not always correlated with AHI