耳鼻咽喉科外来のめまい患者における, めまい自覚症状と睡眠時間の関係

抄録

　 Sleep disorder is a significant comorbidity in patients with dizziness and negatively impacts the patients' quality of life. Dizziness is reported as a risk factor for insomnia. The purpose of this study was to clarify the relationships among self-perceived dizziness handicap, postural balance, and sleep duration in outpatients with dizziness visiting otolaryngology clinics. Toward this end, we reviewed the medical charts of 59 outpatients with dizziness at our otolaryngology clinic and statistically analyzed the data. The results of logistic regression analysis adjusted for sex, age, and medication use (benzodiazepines) revealed that higher total scores (per 10-point increment) on the Dizziness Handicap Inventory (DHI) were significantly associated with sleep durations of 8 hours or longer (1.6 [1.2-2.2], odds ratio [95% confidence interval]). No association was observed between postural balance (velocity of the path length with the eyes closed on posturography) and the sleep duration (0.63 [0.3-1.1]). Receiver Operating Characteristic curve analysis identified a DHI total score of 52 as the optimal cutoff point to identify patients with a predicted sleep duration of ≥ 8 hrs, with a sensitivity of 58% and specificity of 83% (0.72 [0.57-0.87], Area Under the Curve [95% confidence interval]). Both our data and previous reports suggest that higher self-perceived dizziness handicap is associated with a decreased duration of deep sleep as well as a longer duration of sleep as a result of poor sleep quality.