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Polysomnographic diagnoses of insomniac patients. SDB: sleep disordered breathing; SSM: sleep state misperception; ADS: alpha-delta sleep; PLM: periodic limb movement. 

Polysomnographic diagnoses of insomniac patients. SDB: sleep disordered breathing; SSM: sleep state misperception; ADS: alpha-delta sleep; PLM: periodic limb movement. 

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We conducted this study to assess the usefulness of polysomnography (PSG) in patients referred to the sleep disorders center (SDC) with chronic insomnia. Sixty-seven patients with chronic insomnia who underwent overnight polysomnography were included in the study. Clinical diagnoses were reported using the second revision of the International Class...

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... the study period, 67 patients with chronic insomnia underwent PSG. This represents 9.3% of the total performed PSGs during the study period. Only, thirteen (19.4%) visits were physician-initiated and the rest were patient-initiated. Among the physician-initiated visits, seven visits were from psychiatry, two from neurology, two from primary care and two from internal medicine. The mean age of the studied group was 43±1.5 years and males comprised 53.7%. Figure 1 demonstrates the polysomnograp- hic diagnoses of all patients. SSM (subjective insomnia) represented 40.3% of studied insomniacs. SDB, PLM, ADS and idiopathic insomnia represented 25.4%, 7.5%, 10.4% and 16.4%, respectively. Table 2 compares patients with subjective insomnia (SSM) to the rest of the group. Females were more than males in the SSM group while males were more in the non-SSM group. TST, sleep efficiency, deep sleep, and REM sleep were significantly more in the SSM group. On the other hand, SOL and arousal index were significantly less in the SSM group. In general, polysomnographic data in the SSM group were within normal limits. ...

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