Abstract
We performed basic study of laser irradiation for the beating atrium, to evaluate its applicability for the atrial electrical isolation. The atria of 9 mongrel dogs were irradiated with Nd-YAG laser using the contact method. The target of electrical isolation was the right atrial auricule. Irradiation was stopped when right atrial auricular electrical potential disappeared. The success of isolation was determined using postoperative electrophysiological study. Isolation was successful in 7 (820±77.5J), and unsuccessful in 2 (790±30J). Transmural coagulation necrosis of the atrial muscle was noted. In conclusion, it is possible to obtain safe atrial isolation using contact laser irradiation.
