Key result
Pacemaker implantation reveals unidirectional retrograde VA conduction in congenital complete AV block.
Why the study?
Retrograde VA conduction status in patients with congenital complete AV block undergoing dual chamber pacemaker implantation was previously considered absent but requires assessment due to risk of pacemaker mediated tachycardia.
Case Report (n=1)
Retrograde VA conduction can be present in patients with congenital complete AV block, necessitating its assessment during dual chamber pacemaker implantation to prevent pacemaker-mediated tachycardia.
May warrant VA conduction testing during dual-chamber implantation in congenital AV block; single case leaves open broader applicability.
Retrograde ventriculoatrial (VA) conduction is documented at the time of dual chamber pacemaker implantation in a 36-year-old patient with congenital complete atrioventricular (AV) block. Programmed ventricular stimulation with stimuli of increasing prematurity demonstrated a lack of decremental conduction via a unidirectional retrograde pathway. Because retrograde VA conduction has been associated with pacemaker mediated endless loop tachycardia, the status of retrograde conduction should be assessed in all patients undergoing dual chamber pacemaker implantation, including those with congenital complete AV block who have previously been considered to have no conductive tissue between atria and ventricles.
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Zilo et al. (1991) conducted a case report in Congenital complete atrioventricular (AV) block (n=1). Programmed ventricular stimulation was evaluated on Retrograde ventriculoatrial (VA) conduction. Retrograde ventriculoatrial conduction via a unidirectional retrograde pathway was documented in a 36-year-old patient with congenital complete AV block during pacemaker implantation.
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