报告两例预激综合征患者系一家中两姐妹，均有严重发作性室上性心动过速，药物不能有效控制，行心腔内电生理检查诊断为右后间隔旁道，其姐姐仅有逆传，而其妹妹既有前传，又有逆传，但以逆传为主，在Ｘ线透视下，用射频消融（功率３０Ｗ，阻抗９６～１０５），１０ｓ内均成功阻断旁道的逆传及前传，经静脉点滴异丙肾上腺素及程序刺激不能诱发，随访３～６个月无心动过速发作。 Report two cases of pre-excitation syndrome in patients with a family of two sisters, have severe paroxysmal supraventricular tachycardia, the drug can not be effectively controlled by intracardiac electrophysiological examination of the right posterior septum, the diagnosis of its sister only Reverse, while his sister both prequel, but also reverse, but to reverse the main X-ray fluoroscopy (power 30W, impedance 96 ~ 105), within 10s have successfully blocked the bypass Adverse and prequel, intravenous infusion of isoproterenol and procedural stimulation can not be induced, followed up for 3 to 6 months without tachycardia attack.