The aim of this work was to estimate excessive somnolence and frequency of episodes of dozing off during driving a car in patients with obstructive sleep apnea. Result of questionnaire and polysomnographic investigations were analysed in a group of 503 patients. Mean age for the whole group was 49.2 +/- 9.7 of years, BMI 32.1 +/- 1.4 kg/m2 and the value for apnea and hypopnea index 45.4 +/- 24.8. Excessive somnolence during driving was reported by 49.1% of patients. 31.2% of the group notified at least one episode of falling asleep while driving a car. Sleepy drivers (group A) were significantly younger (46.5 +/- 9.2 vs 50 +/- 9.8 years) and had higher values of BMI (34.1 +/- 7 vs 31.1 +/- 5.5 kg/m2) than the others (group B) Results of polysomnographic investigation showed more severe sleep apnea in the group A. Mean value of AHI for this group was 52.5 +/- 26.1 vs 41.6 +/- 23.5 in the group B. Besides, somnolence in many other practical situations was more often considered as a serious problem in the group A.
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