This study was performed to evaluate the characteristics of penile erection during midazolaminduced sedation after nocturnal sleep deprivation (NSD) and to determine the effect of NSD on erectile episodes in healthy, sexually functional young men. This procedure might possibly prove to be a brief office-based method of assessing whether erectile dsyfunction is psychogenic or biogenic. Nineteen volunteers between the ages of 20 and 29 years participated in this study. We measured the morning penile erection after midazolam (3-5 mg) administration intravenously and all subjects completed 42 tests. Of 42 test, 28 tests revealed erectile episodes, wereas no erectile episodes were observed in 14 tests. Nocturnal sleep deprivation rate was significantly higher in tests with erectile episodes than in tests without erectile episode (P ¼ 0.030). Test order or duration of test was not different between two test results. Number of erectile episodes (r ¼ 0.374, P ¼ 0.015), tip radial rigidity (r ¼ 0.412, P ¼ 0.007), base radial rigidity (r ¼ 0.366, P ¼ 0.017) and tip tumescence (r ¼ 0.447, P ¼ 0.003) correlated with the degree of NSD. When we determined whether NSD was discriminative with regard to erectile episodes, the area under the receiver operating characteristic curve was calculated at 0.705 (95% confidence interval, 0.527-0.883; P ¼ 0.032) for the possibility of erectile episodes. Nocturnal sleep deprivation might recover the inhibited rapid eye movement sleep during midazolam-induced sedation. Our findings suggest that erection monitoring during midazolam-induced sedation after NSD may be convenient. However, validation of midazolaminduced morning penile tumescence monitoring with a large population is mandatory.
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