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目的:分析改良的双腔微导管在冠状动脉分叉病变血流储备分数（Fractional flow reserve，FFR)测定中应用的安全性和有效性。方法:两个中心28例冠状动脉分叉病变患者分为传统技术组和新技术组，回顾性分析两组患者进行FFR检查时的射线时间、造影剂剂量及FFR相关并发症情况。结果:传统技术组16例，新技术组12例。传统技术组FFR平均射线时间（33.25±7.30）s，平均使用造影剂量（80.81±27.46）ml，显著多于新技术组的（21.17±3.33）s、（50.83±15.15）mL（两组均n P<0.05）。传统技术组有3例操作失败，出现冠脉痉挛2例；新技术组全部操作成功，未出现并发症。n 结论:有限的经验表明，在冠状动脉分叉病变主支植入支架后，应用改良的双腔微导管协助进行“关闭分支”FFR测定是一种安全、有效的方法。“,”Objective:To analyze the safety and effectiveness of application of modified double-lumen microcatheter in the measurement of fractional flow reserve(FFR) in coronary bifurcation lesions.Methods:Total of 28 patients with coronary bifurcation lesions in two centers were divided into two groups:conventional technique group(CON) and novel technique group(NOV). The fluoroscopy time, contrast dye usage and FFR-related complications of the two groups were analyzed retrospectively.Results:There were 16 cases in CON group and 12 cases in NOV group. The median time required fluoroscopy in NOV group was significantly less than that in CON group; additionally, lesser amounts of contrast dye were used in NOV group (both n P0.05).n Conclusions:Limited experience suggests that the application of modified double-lumen microcatheter in the jailed SB FFR measurement after MV stenting is a safe and technically feasible approach.