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Image of PSVT with two alternate CL. HV interval (yellow arrow) and VA interval (red arrow) were the same. AH interval was 207 ms when AVRT conducted the fast pathway (bule arrow). The fast pathway could not react to the return of VA conduction because of its refractory period. Therefore AVRT conducted the slow pathway, and its interval was 247 ms (green arrow). FP: fast pathway, SP: slow pathway, AP: accessory pathway
