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REM sleep and bradyarrhythmia episodes in rats
K Otsuka1, T Kawakami, H Saito
1Department of Medicine, Tokyo Women's Medical College, Daini Hospital, Ku, Japan.
Journal of Electrocardiology
|July 1, 1989
Summary
Rapid eye movement (REM) sleep events are closely linked to bradyarrhythmia in rats. Increased REM density correlated with higher bradyarrhythmia incidence, suggesting a significant association.
Area of Science:
- Neuroscience
- Cardiology
- Sleep Medicine
Background:
- Bradyarrhythmia, characterized by slow heart rate, can occur during sleep.
- Rapid eye movement (REM) sleep is a distinct sleep stage with unique physiological characteristics.
Purpose of the Study:
- To investigate the relationship between REM sleep phasic events and bradyarrhythmia in Wistar rats.
- To determine if REM density influences the occurrence of bradyarrhythmia.
Main Methods:
- Continuous monitoring of ECG, EEG, and EOG in five male Wistar rats for 6 days.
- Classification of sleep states (alertness, slow-wave sleep, paradoxical sleep) and measurement of REM density.
- Categorization of bradyarrhythmias into short (<5 sec) and long (>5 sec) durations.
Main Results:
- Bradyarrhythmia incidence was significantly higher during paradoxical sleep (22.4%) compared to alertness (0.35%) and slow-wave sleep (0.03%).
- A strong correlation was observed between REM density and bradyarrhythmia episodes, with 78.5% of episodes linked to REM bursts.
- Latency between REM bursts and bradyarrhythmia varied by type: 2.17 sec for long and 3.78 sec for short episodes.
Conclusions:
- The study suggests a close association between REM sleep phasic events and the occurrence of bradyarrhythmia.
- REM density appears to be a significant factor contributing to bradyarrhythmia during sleep.