Key result
Two patients with dizziness or syncope and prolonged HV intervals demonstrated Wenckebach block in the bundle branch system, either at rest or during atrial pacing.
Case Report (n=2)
The report highlights the occurrence of Wenckebach block in the distal conduction system in patients with trifascicular disease presenting with syncope or dizziness.
May indicate infra-Hisian Wenckebach as a mechanism in symptomatic trifascicular disease; leaves open need for prospective validation.
Summary: Two patients presented with dizziness or syncope and electrocardiographic evidence of intraventricular and/or atrioventricular conduction abnormalities. Both had prolonged HV intervals at rest indicating trifascicular disease. Wenckebach block in the bundle branch system was present in one patient at rest and in the other during atrial pacing. The significance of these findings are discussed.
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Hunt et al. (1974) conducted a case report in Wenckebach block in the distal conduction system (n=2). Wenckebach block in the bundle branch system was evaluated on Electrocardiographic evidence of conduction abnormalities. Two patients with dizziness or syncope and prolonged HV intervals demonstrated Wenckebach block in the bundle branch system, either at rest or during atrial pacing.
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