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Cardiac asystole post-exercise: a report of two cases
M P van den Berg1, H J Crijns, T R Bouwmeester
1Department of Cardiology, Thoraxcenter, University Hospital Groningen, The Netherlands.
International Journal of Cardiology
|October 1, 1995
Summary
Post-exercise cardiac asystole in two patients was linked to high vagal tone. This suggests excessive rebound vagotonia, not just vasovagal response, may cause this cardiac event.
Area of Science:
- Cardiology
- Autonomic Nervous System Function
Background:
- Post-exercise cardiac asystole is a rare event.
- Investigating the underlying mechanisms of exercise-induced cardiac events is crucial for patient management.
Observation:
- Two patients presented with reproducible cardiac asystole immediately following exercise.
- Standard cardiac evaluations, including structural assessments and autonomic function tests (head-up tilt), revealed no abnormalities.
Findings:
- Electrophysiologic testing and 24-hour Holter monitoring demonstrated high vagal tone in both patients.
- Heart rate variability analysis indicated a significant parasympathetic influence post-exercise.
Implications:
- The findings challenge the sole attribution of post-exertional asystole to vasovagal syncope.
- Excessive rebound vagotonia may be an independent or contributing factor to exercise-induced cardiac asystole.
- Further research is warranted to elucidate the role of vagal tone in post-exertional cardiovascular events.