Decreased Delta-Sleep and Plasma Delta-Sleep-Inducing Peptide in Patients with Cushing Syndrome

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Abstract
To evaluate the sleep disturbances of patients with Cushing syndrome and to examine the relationship between the sleep disturbances and plasma levels of delta-sleep-inducing peptide-like immunoreactivity (DSIP-LI), we performed three polysomnographic/endocrinological studies in patients with Cushing syndrome. In study 1, polysomnography was studied in 12 patients and 12 matched normal volunteers. In addition, DSIP-LI was measured every 30 min for 24 h in 9 patients with Cushing syndrome and 12 normal volunteers. The percentage of time spent in delta sleep (stages 3 and 4) was significantly reduced in patients with Cushing syndrome (5.8 ± 1.4%; mean ± SEM) compared to normal volunteers (14.0 ± 2.5%) (p

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