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Effects of Nocturnal Hemodialysis on Melatonin Rhythm and Sleep-Wake Behavior: An Uncontrolled Trial.

BACKGROUND:
End-stage renal disease and its treatment are associated with sleep disturbances such as deterioration of the circadian sleep-wake pattern. Melatonin rhythm, which has an important role in this pattern, is disturbed. The nocturnal melatonin surge is absent in this population. Whether nocturnal in-center hemodialysis changes melatonin and sleep-wake rhythms is unknown.

STUDY DESIGN:
A nonrandomized uncontrolled trial. Patients served as their own controls.

SETTING & PARTICIPANTS:
Thirteen daytime hemodialysis patients (median age, 58 years; 5 women) from our hospital receiving conventional daytime hemodialysis 3 times weekly for 3 to 4 hours each session.
INTERVENTIONS: Six months of treatment with nocturnal in-center dialysis 4 nights/wk with 8-hour sessions. OUTCOMES &

MEASUREMENTS:
At baseline, while still on conventional hemodialysis therapy, polysomnography was performed, sleep questionnaires were filled out, and melatonin concentration in saliva was obtained. After 6 months of in-center nocturnal hemodialysis, all measurements were repeated.

RESULTS:
After 6 months of in-center nocturnal hemodialysis, polysomnography showed significant improvements in sleep efficiency (P = 0.05) and stage 3/4 sleep (P = 0.03) in comparison to t = 0. Trends in improvement of rapid-eye-movement sleep, awake time, and oxygen saturation were seen after 6 months of in-center nocturnal hemodialysis therapy. Sleep questionnaires showed a trend in improved sleep quality and daytime function. Patients were less exhausted during the daytime. The nocturnal melatonin surge was partially restored.

LIMITATIONS:
Small sample size and a nonrandomized uncontrolled study design.

CONCLUSIONS:
Patients after 6 months of in-center nocturnal hemodialysis had significant improvements in subjective and objective sleep parameters and partially restored nocturnal melatonin rhythm.

Fonte Medline

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