Abstract
In a patient with Fallot's triology showing rate-dependent 21 A-V conduction, administration of isoprenaline always resulted in the appearance of atrial reciprocal beating. Analysis of the mechanism of atrial reciprocal rhythm in the case strongly suggests an electrophysiological explanation for the 2:1 A-V conduction present, based on the operation of concealed atrial reciprocation. The presence of functional longitudinal dissociation of the A-V pathway of congenital nature is postulated.
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