Key result
Retrograde left bundle branch invasion is thought to cause functional LBBB during AV nodal tachycardia.
This case report highlights retrograde invasion into the left bundle branch as a mechanism for functional left bundle-branch block during AV nodal tachycardia.
Suggests retrograde invasion sustains functional LBBB in AV nodal tachycardia; hypothesis-generating observation requiring validation.
A description is given of a patient with an atrioventricular nodal tachycardia with left aberrant conduction changing into nonaberrant conduction after a ventricular premature beat. Functional left bundle-branch block by retrograde invasion into the left bundle branch is thought to be responsible for this phenomenon.
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Wellens et al. (1968) studied this question. Retrograde invasion into the left bundle branch is thought to cause functional left bundle-branch block, explaining left aberrant conduction during atrioventricular nodal tachycardia.
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