title: Cardiac asystole post-exercise: a report of two cases.
abstract: Two patients are described with reproducible cardiac asystole post-exercise. No structural heart disease was demonstrable. At autonomic function testing no abnormal responses were noted. Also, head-up tilt tests were normal. However, electrophysiologic testing and heart rate variability during 24-h Holter monitoring were indicative of a high vagal tone in both patients. The findings suggest that post-exertional asystole may not be due solely to a vasovagal mechanism; excessive rebound vagotonia per se may also play a role.
authors.affiliation: Department of Cardiology, Thoraxcenter, University Hospital Groningen, The Netherlands.
authors.forename: M P
authors.initials: MP
authors.lastname: van den Berg
authors.forename: H J
authors.initials: HJ
authors.lastname: Crijns
authors.forename: T R
authors.initials: TR
authors.lastname: Bouwmeester
authors.forename: A J
authors.initials: AJ
authors.lastname: Smit
authors.forename: K I
authors.initials: KI
authors.lastname: Lie
mesh_terms: D000328:Adult; D001146:Arrhythmia, Sinus / Q000209:etiology; D001281:Atrial Fibrillation / Q000209:etiology; D001919:Bradycardia / Q000209:etiology; D015716:Electrocardiography, Ambulatory; D006323:Heart Arrest / Q000209:etiology* / Q000503:physiopathology; D006801:Humans; D008297:Male; D005082:Physical Exertion / Q000502:physiology*; D015203:Reproducibility of Results; D013575:Syncope / Q000209:etiology / Q000503:physiopathology; D014630:Vagus Nerve / Q000503:physiopathology; D014666:Vasomotor System / Q000503:physiopathology