Abstract

A 42 years old man was introduced to our hospital with suspicion of obstructive sleep apnea syndrome (OSAS). He was not obese but had a chief complaint of excessive daytime sleepiness. A polysomnography showed an apnea-hypopnea index (AHI) of 46.3/hr and an arousal index of 47.9/hr, he therefore was diagnosed as severe OSAS. The first laboratory examination showed high level of creatine kinase (2912 U/l), which lead to the detection of primary hypothyroidism (TSH 138.4 IU/ml, FT3 0.45pg/ml, FT4 0.12ng/dl).

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