Institute of Geriatric Cardiology, Chinese People's Liberation Army General Hospital, Beijing 100853, China.
Chin Med J (Engl). 2012 Jan;125(1):16-20.
Atrioventricular nodal reentrant tachycardia (AVNRT) is one of the most common paroxysmal supraventricular tachyarrhythmias. The aim of the study was to prospectively compare the characteristics of radiofrequency catheter ablation of AVNRT guided by a magnetic navigation system with the conventional procedure.
Patients with AVNRT diagnosed by electrophysiological tests were randomized into two groups. In the conventional technique group (CMT), a common 4-mm-tip quadrapolar temperature-controlled ablation catheter was used. In the magnetic navigation system guidance group (MNS), a magnetic 4-mm-tip quadrapolar temperature-controlled ablation catheter was used. The following parameters were collected and compared between the two groups: ablation procedure time, patient fluoroscopy time, operator fluoroscopy time, energy delivery numbers, maximal energy per deployment, success rate, complication rate and operative cost.
Forty patients were enrolled and randomized into CMT and MNS groups. The age, gender, tachycardia history and basic cardiovascular diseases of the two groups were comparable (P > 0.05). All procedures were conducted successfully without complications. No tachycardia recurred during the follow-up period of (9.3 ± 2.6) months. In the MNS group, the patient and operator fluoroscopy times ((11.5 ± 4.3) min, (4.2 ± 1.5) min), energy delivery numbers (3.2 ± 0.9), and maximal energy per deployment ((16.9 ± 3.4) W) were shorter or lower than those of the CMT group ((14.3 ± 6.2) min, (13.6 ± 3.5) min, 6.3 ± 2.1, (23.7 ± 1.3) W, respectively) (P < 0.05). But the operative cost for the MNS group was higher than that of the CMT group (P < 0.01).
Magnetic navigation system guided radiofrequency catheter ablation of AVNRT has the advantages of shorter fluoroscopy time and lower energy delivery numbers and maximal energy per deployment compared to the present conventional ablation technique.
房室结折返性心动过速（AVNRT）是最常见的阵发性室上性心动过速之一。本研究旨在前瞻性比较磁导航系统引导与传统方法指导下射频导管消融房室结折返性心动过速的特征。
经电生理检查诊断为 AVNRT 的患者被随机分为两组。在传统技术组（CMT）中，使用普通的 4 毫米尖端四极温度控制消融导管。在磁导航系统引导组（MNS）中，使用磁 4 毫米尖端四极温度控制消融导管。收集并比较两组以下参数：消融程序时间、患者透视时间、术者透视时间、能量输送次数、每次部署的最大能量、成功率、并发症发生率和手术费用。
40 例患者入组并随机分为 CMT 和 MNS 组。两组患者的年龄、性别、心动过速病史和基础心血管疾病均无差异（P>0.05）。所有手术均成功完成，无并发症发生。随访期间（9.3±2.6）个月无心动过速复发。在 MNS 组中，患者和术者透视时间（（11.5±4.3）min，（4.2±1.5）min）、能量输送次数（3.2±0.9）和每次部署的最大能量（（16.9±3.4）W）均低于 CMT 组（（14.3±6.2）min，（13.6±3.5）min，6.3±2.1，（23.7±1.3）W）（P<0.05）。但 MNS 组的手术费用高于 CMT 组（P<0.01）。
与目前的常规消融技术相比，磁导航系统引导射频导管消融 AVNRT 具有透视时间更短、能量输送次数和每次部署的最大能量更低的优点。
