[Effect of intravenous vitamin C on sleep quality in hemodialysis patients]

ABSTRACT

Poor sleep quality is common among hemodialysis patients and can potentially predict morbidity, mortality and quality of life in these patients. On the other hand, hemodialysis patients are encountered with vitamin C deficiency. The purpose of this study was to determine the effect of intravenous vitamin C on sleep quality in hemodialysis patients. In this double blind randomized clinical trial, 60 qualified hemodialysis patients were gone under investigation in Sari a city located in North of Iran during 2010. Patients randomly allocated in two equal intervention and control groups. The main measured outcome was the Pittsburg sleep quality index [PSQI] which consists of seven components. At the end of each hemodialysis session, Intervention group received vitamin C vial [500mg/5cc] intravenously, three times a week for 8 weeks and control group received normal saline in a same way. Data were collected at pretreatment and after two months of treatment. Data were analyzed by Independent t test, Paired t test, Wilcoxon and Chi-Square tests. The result indicated that the sleep quality improves significantly in vitamin C group but not in control group [P<0.001]. Vitamin C caused significant improvement in subjective sleep quality, sleep latency, habitual sleep efficiency and sleep disturbances in intervention group [p<0.05]. Also, Global PSQI score of intervention group had a greater improvement than control group. Moreover vitamin C caused significant improvement in subjective sleep quality, sleep latency, habitual sleep efficiency and sleep disturbances in intervention group after treatment [p< 0.05]. This study showed that intravenous vitamin C can effectively improve sleep quality in hemodialysis patients