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Unilateral hemidiaphragm weakness is associated with positional hypoxemia in REM sleep
Marcel A Baltzan1, Adrienne S Scott, Norman Wolkove
1Mount Sinai Hospital Center and the Department of Epidemiology and Biostatistics, McGill University, Montreal, Canada. marc.baltzan@clinepi.mcgill.ca
Summary
Patients with unilateral diaphragmatic paralysis (UDP) experience significant oxygen desaturations during REM sleep, particularly when sleeping in certain positions. These findings highlight position-dependent hypopneas in UDP patients during sleep.
Area of Science:
- Pulmonology
- Sleep Medicine
- Respiratory Physiology
Background:
- Unilateral diaphragmatic paralysis (UDP) can cause varied respiratory symptoms and reduced lung function.
- This study investigates polysomnographic respiratory characteristics in UDP patients without obstructive sleep apnea.
Observation:
- Five UDP patients underwent clinical investigation, lung function tests, and nocturnal polysomnography.
- Respiratory events were scored, and sleep characteristics were analyzed by sleep-wake stage and body position.
- Data were compared to five age, gender, and BMI-matched controls.
Findings:
- Three patients exhibited significant awake lung restriction (mean FVC 72% predicted).
- All patients showed prolonged hypopneas with significant desaturation during REM sleep, especially when supine or on the unaffected side.
- Saturation levels were consistently lower in UDP patients compared to controls across all sleep stages and positions.
Implications:
- UDP patients exhibit position-dependent hypopneas during REM sleep, leading to frequent desaturations.
- These findings underscore the importance of sleep position in managing respiratory compromise in UDP.
- Further research may explore interventions to mitigate sleep-related hypoxemia in this population.
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