Key result
Two cases demonstrated a Wenckebach form of exit conduction between an electrical pacemaker and the ventricular myocardium, manifesting with increasing latency and ultimate stimulus failure.
Case Report (n=2)
Wenckebach exit block from a pacemaker to the ventricle manifests as increasing stimulus-to-QRS latency followed by dropped beats and indicates an adverse prognosis.
Wenckebach exit block signals adverse prognosis in paced patients; case reports leave open whether latency monitoring improves outcomes.
Two cases which exhibited a Wenckebach form of exit conduction between an electrical pacemaker and the ventricular myocardium are presented. This manifests with increasing latency (stimulus to QRS intervals) and ultimate stimulus failure (block). The cycle then repeats itself. The QRS duration also increases progressively within each cycle. The phenomenon connotes an adverse prognosis. Several postulates regarding the mechanism are discussed.
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Klein et al. (1976) conducted a case report in Wenckebach phenomenon between electric pacemaker and ventricle (n=2). Electrical pacemaker was evaluated on Wenckebach form of exit conduction. Two cases demonstrated a Wenckebach form of exit conduction between an electrical pacemaker and the ventricular myocardium, manifesting with increasing latency and ultimate stimulus failure.
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