title: Periodic variation in A-V conduction time: the 'supernormal' phase of A-V conduction. A study in differential dual A-V pathway conductivity and refractoriness.
mesh_terms: D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged; D012032:Refractory Period, Electrophysiological; D009435:Synaptic Transmission