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目的：探讨房室旁道患者房室结的电生理特性。方法：40倒房室旁道患者被分为显性预激组（Ⅰ组）与隐匿性房室旁道组（Ⅱ组），18例房性心动过速、心房扑动患者或不明原因心悸者为对照组，在射频消融术后行心内电生理检查，分别测量用药（美托洛尔及阿托品）前、后窦性心律周期长度（SCL）、AH或HV间期、房室阻滞周长（AVBCL）、房室结有效不应期（AVNERP）、室房阻滞周长（VABCL）及空房有效不应期（VAERP）。结果：用药前：Ⅰ、Ⅱ两组之AH间期均较对照组明显缩短，而VABCL及AVERP则较对照组明显延长；用药后：Ⅰ、Ⅱ两组之VABCL及VAERP仍较对照组延长（P＜0．05），而3组之SCL则均较用药前明显缩短，其余指标变化不显著。结论；房室旁道患者VABCL及VAERP较对照组明显延长，而显性预激与隐匿性房室旁道患者房室结电生理特性差异不显著。
Objective: To explore the electrophysiological characteristics of atrioventricular node in patients with atrioventricular canal. Methods: 40 patients with APA were divided into two groups: dominant pre-excitation group (group Ⅰ) and occult paraventricular bypass group (group Ⅱ), 18 patients with atrial tachycardia, atrial flutter or unexplained palpitation (Control group) undergoing cardiac electrophysiology examination after radiofrequency catheter ablation and measuring the length of sinus rhythm (SCL), AH or HV interval, and atrioventricular block before and after treatment (metoprolol and atropine) AVBCL, AVNERP, VABCL and VAERP. Results: Before treatment, the duration of AH in both groups was significantly shorter than that in control group, but VABCL and AVERP were significantly longer than those in control group. After treatment, the levels of VABCL and VAERP in groups Ⅰ and Ⅱ were still longer than those in control group P <0.05), while the SCL of the three groups were significantly shorter than before treatment, the other indicators did not change significantly. Conclusions: VABCL and VAERP in patients with atrioventricular bypass were significantly longer than those in control subjects, but there was no significant difference in the electrophysiological characteristics of atrioventricular node in patients with dominant pre-excitation and occult AVP.