Obstructive Sleep Apnea Summary

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A 35 year old gentleman was referred for suspicion of obstructive sleep apnea (OSA). His past medical history included two episodes of stroke at ages 27 and 34 years with no residual neurological deficits in association with a patent foramen ovale which was surgically closed 6 months prior to the visit to our clinic. His sleep history included snoring, witnessed apneas and spontaneous arousals described by his wife with no difficulty in resuming sleep. He described feeling fatigued and sleepy in the mornings. His Epworth Sleepiness Score was 9 and Mallampati score was 2. A diagnostic sleep study showed a mild obstructive sleep apnea with an overall apnea-hypopnea index (AHI) of 14.4 events/hr and mild periodic limb movements during sleep with an index of 14.1 events/hr. Interestingly, when he was in the right lateral position, his AHI was 87 events/hr compared to only 17 events/hr on the left side and 6 events/hr while supine. He spent 22 minutes on his right side all of which was spent in stages N1 and N2 sleep. The figure below shows an epoch from the polysomnogram (PSG) recording demonstrating 2 obstructive hypopneas as indicated by the out-of-phase chest and abdominal movements on respiratory inductance plethysmography, accompanied by arousals from sleep while in the right lateral position.…show more content…
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