Over-hydration is a significant and modifiable independent predictor of OSA severity in dialysis patients with excessive daytime sleepiness, particularly in peritoneal dialysis patients, suggesting active volume management should be considered a primary therapeutic target.
OSA was highly prevalent among dialysis patients with excessive daytime sleepiness, present in 75% of participants.
AHI severity correlated significantly with over-hydration status in the overall OSA group.
Over-hydration was identified as an independent predictor of AHI severity in all dialysis patients via multiple linear regression.
Dialysis vintage was an additional independent predictor of AHI severity specifically in peritoneal dialysis patients.
Typical OSA symptoms such as snoring did not significantly differ based on OSA presence or severity in dialysis patients.
The Epworth Sleepiness Scale was evaluated as a potentially useful screening tool for OSA risk in dialysis patients.
This research suggests that fluid overload — having too much water retained in the body — is a key, potentially treatable factor that worsens obstructive sleep apnea (OSA) in patients on dialysis for kidney failure. The study followed 40 dialysis patients who reported excessive daytime sleepiness and found that three-quarters of them had OSA confirmed by a sleep monitoring test. Among those patients, the more over-hydrated they were, the more severe their sleep apnea tended to be. This relationship was especially strong in patients on peritoneal dialysis, for whom the length of time on dialysis also mattered. An important practical finding was that common OSA warning signs like snoring were not reliably different between patients who had OSA and those who did not, making it harder to identify at-risk patients based on typical symptoms alone. Instead, the researchers found that a simple questionnaire called the Epworth Sleepiness Scale — which asks patients how likely they are to doze off in various situations — may be a useful first step for identifying dialysis patients who should be tested for sleep apnea. This research suggests that managing fluid levels more aggressively in dialysis patients — using objective body composition measurements to guide treatment — could potentially reduce the severity of sleep apnea in this population. Because fluid overload is a modifiable condition, this finding points toward a practical therapeutic target that could improve both sleep quality and overall health outcomes for people with end-stage kidney disease.
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Upload Your LabsPark S, Heo C, Park B, Ko J, Park K, Lee J, et al.. (2026). Over-hydration as a key modifiable predictor of obstructive sleep apnea severity in dialysis patients with daytime sleepiness.. Medicine. https://doi.org/10.1097/MD.0000000000050524