PMC6008001_01
Polysomnography test. Paradoxical bradycardia and 5.5 s asystole in REM sleep stage
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fig1
Index (AHI) 1.8 events/h). Importantly, episodes of bradycardia were documented only during phasic events of REM sleep (Fig. 1).
Sleep-time heart rate variability analysis by Poincare plot illustrates an increased parasympathetic activity in REM sleep stage and sympathetic overactivity during the rest of the day
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fig2
REM sleep phase compared to wakefulness, and NREM sleep stages 1-3 (Fig. 2). REM sleep-related bradyarrhythmia syndrome was diagnosed.