阵发性心房颤动患者心房肌波长指数的特点

Characteristic of Atrial Wavelength Indices in Patients With Paroxysmal Atrial Fibrillation

采用波长指数（WLI）=心房功能不应期×（电极间距／心房除极时限）公式计算心房内希氏束（His）、冠状静脉窦口（CSO）、冠状静脉窦中部（CSm）三个部位的WLI，探讨阵发性心房颤动（简称房颤）患者心房肌WLI的特点。观察对象为8例患者，有房颤病史2日～11年。其中6例进行了导管射频消融改良房室结控制快速心室率治疗。8例改良前His、CSO、CSm等处所测的WLI分别为3．95±0．71，1．23±0．26，1．29±0．24cm，6例改良后分别为4．06±0．75，1．43±026，1．32±0．26cm，与对照组相应的三个部位的WLI（5．56±0．71，1．83±0．27，1．92±0．82cm）分别相比，P均＜0．001；改良前、后三个部位的WLI分别相比无显著变化，P＞0．5。认为心房肌WLI／小者容易发生房颤。

The method,wavelength index (WLI)=atrial functional refractory period × (interpolar distance/dura-tion of atrial activation),was used to calculate WLIs at endomyocardial sites of His bundle,coronary sinus orifice,middle coronary sinus, to investigate the characteristic of WLI in paroxysmal atrial fibrillation (PAF). Eight pa-tients (6 males,2 females) with histroy of PAF form 2 days to 11 years were accepted electrophysiological exami-nation. Modification of atrioventricular node(AVN) at middle or inferior posterior part of Koch' s triangle by ra-diofrequency energy in six of those patients. Thirty patients with atrioventricular node reentrant tachycardia,with-out history of atrial fibrillation (AF) or inducible PAF,were selected as control group. WLIs at the three sites inpatients with PAF were significantly shorter than control group. WLIs were not significantly changed after AVNmodification than be fore. It is concluded that the shorter are WLIs,the more easily does AF occur.