Mounsey J P, Griffith M J, McComb J M
Department of Cardiology, Freeman Hospital, Newcastle Upon Tyne, United Kingdom.
J Cardiovasc Electrophysiol. 1994 May;5(5):432-7. doi: 10.1111/j.1540-8167.1994.tb01182.x.
We report radiofrequency ablation of a Mahaim fiber in a patient with wide complex supraventricular tachycardia. Pathway potentials from the lateral aspect of the right AV groove were recorded, which were distinct from the His potential. During atrial pacing, decremental properties of the fiber were demonstrated, which resulted in prolongation of the interval between the atrial electrogram and the Mahaim pathway potential. The pathway potentials, preexcitation, and tachycardia disappeared after a single application of radiofrequency energy, after which the patient has remained free of palpitations. Mapping of a Mahaim fiber by identifying pathway potentials thus allowed accurate localization and successful ablation with minimal energy. We therefore suggest that, where possible, recording of such Mahaim potentials may be the optimal technique for Mahaim fiber localization.
我们报告了1例宽QRS波室上性心动过速患者Mahaim纤维的射频消融治疗。记录到右房室沟外侧的通道电位，其与希氏束电位不同。心房起搏时，显示该纤维具有递减特性，导致心房电图与Mahaim通道电位之间的间期延长。单次应用射频能量后，通道电位、预激和心动过速消失，此后患者未再有心悸发作。通过识别通道电位对Mahaim纤维进行标测，从而能够以最小能量实现精确定位和成功消融。因此，我们建议，在可能的情况下，记录此类Mahaim电位可能是Mahaim纤维定位的最佳技术。
