房室结四径路已有报道,但此例尤为典型。患者女,45岁,阵发性心慌3年,无心前区疼痛史。多处就医,五次静息ECG正常,血脂正常,踏车试验阴性,彩色UCG检查正常。用泰州产FD-1型多功能心脏程序刺激仪作食管心房调搏。调搏前窦性周期800ms。电极导管插入35cm,脉冲电压30V,脉宽10ms。测得SNRT1360ms,SACT120ms。再以680ms的起搏周期作S_2反向扫描,步长10ms。S_1S_2380ms时,S_2R_2间期260ms,到S_1S_2370ms时,S_2R_2间期突然延长为370ms,一次延长110ms(图1A),说明快径路阻滞,转为中速径路传导。至 Atrioventricular node path has been reported, but this case is particularly typical. Female patient, 45 years old, paroxysmal palpitation 3 years, no history of pain in the anterior region. Multiple medical treatment, resting ECG five times normal, normal blood lipids, treadmill test negative, normal color UCG examination. Taizhou FD-1-type multi-function cardiac program stimulator for esophageal atrial pacing. Sinusoidal cycle 800ms before pacing. Lead into the catheter 35cm, pulse voltage 30V, pulse width 10ms. Measured SNRT1360ms, SACT120ms. And then 680ms pacing cycle S_2 reverse scan, step 10ms. S_1S_2380ms, S_2R_2 interval of 260ms, to S_1S_2370ms, S_2R_2 interval suddenly extended to 370ms, an extension of 110ms (Figure 1A), indicating a fast track block, to transfer to the medium-speed path. to