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A randomized pilot study to evaluate safety and efficacy endpoints for treatment of para-hisian accessory pathways according to two different strategies of lesion formation. These patients will be divided into 2 groups with different strategies of treatment: group 1 treated with radiofrequency (RF) ablation, group 2 with cryotherapy (CRYO). The primary outcome will be the recurrence rate of accessory pathway conduction after six months of follow-up. Secondary endpoints will be immediate success and rate of permanent atrioventricular (AV) block.
study for discovering new criteria for localization of site of accessory pathway from surface ECG