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Cardiac refractory periods (RP) and the filtering properties (FP) of the A-V node (AVN) were investigated in isolated perfused rabbit hearts. It was found that: (1) the AVN effective RP was shorter than the atrial functional RP in most cases; (2) the AVN conduction curve was always smooth. The results suggest that the AVN of the rabbit heart may not have the FP or any dual atrioventricular pathways...
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