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目的:分析早期剖宫产切口部妊娠（CSP）患者侧支供血的发生情况及影响因素。方法:本研究为多中心的病例对照研究，以郑州市第一人民医院、郑州市中心医院、郑州市第三人民医院、河南省直第三人民医院2017年1月1日至2020年6月30日219例CSP住院患者为研究对象，获取其临床资料，数字减影血管造影影像分析采用双盲法，将研究对象分为有侧支供血组和无侧支供血组，计算早期CSP侧支供血的发生率，采用多因素logistic回归模型分析早期CSP侧支供血发生的影响因素，同时比较两组患者子宫动脉栓塞术（UAE）后的临床结局情况。结果:219例早期CSP患者年龄为（32.4±5.0）岁，孕期为（51.0±10.6）d，早期CSP侧支供血发生率为12.3%（27例），发生于左侧者16例，右侧者6例，双侧者5例；共发现43条侧支供血血管，平均每患者1.59条，侧支供血血管来源以膀胱动脉最多见，占74.4%（32/43），其次为阴部内动脉，占18.6%（8/43）。多因素分析结果显示，孕周≥8周、妊娠囊最大径≥50 mm、妊娠囊呈富血供型是早期CSP侧支供血发生的影响因素，n OR值（95%n CI）分别为3.68（1.06~12.76）、7.00（1.52~32.19）、9.96（3.59~27.58），均n P0.05）。n 结论:早期CSP具有一定的侧支供血发生率，有可能对UAE的疗效及患者安全产生不利影响；孕周、妊娠囊最大径及其血管化程度在提示早期CSP侧支供血上具有一定的价值，有助于UAE过程中对妊娠囊的完全栓塞。“,”Objective:To investigate the characteristics and effect factors of collateral blood supply of patients with early trimester cesarean scar pregnancy(CSP).Methods:This study was a multicenter case-control study, with 219 inpatients with CSP in First People′s Hospital of Zhengzhou, Zhengzhou Central Hospital, Third People′s Hospital of Zhengzhou and Henan No3 Provincial People′s Hospital from January 1, 2017 to June 30, 2020 who were selected to obtain their clinical data. Double-blind method was performed in digital subtraction angiography imaging analysis. The patients were divided into collateral blood supply group and non-collateral blood supply group, and the incidence of collateral blood supply of patients with early trimester CSP was calculated. Multivariate binary logistic regression analysis was performed to find the independent risk factors of collateral blood supply of patients with early trimester CSP. As well, clinical outcomes after uterine artery embolization (UAE) were compared between the two groups.Results:A total of 219 patients with early trimester CSP have average age of (32.4±5.0) years old and average pregnancy of (51.0±10.6) days. The incidence of collateral blood supply was 12.3% (27 cases), of which16 cases were on the left, 6 on the right and 5 in both sides. A total of 43 collateral vessels were found, with 1.59 vessels per patient on average. Bladder artery was the most common source of collateral blood supply, accounting for 74.4% (32/43), followed by internal pudendal artery for 18.6% (8/43). Multivariate binary logistic regression analysis showed that gestational weeks ≥8 weeks, maximum diameter of gestational sac ≥50 mm and rich blood supply of gestational sac are independent risk factors for collateral blood supply of patients with early trimester CSP, with n OR (95%n CI) 3.68 (1.06-12.76), 7.00 (1.52-32.19)、9.96 (3.59-27.58), respectively, all n P0.05).n Conclusions:Early trimester CSP leads to a certain occurrence of collateral blood supply, which may have adverse impact on the efficacy of UAE and patient safety. Gestational weeks, the maximum diameter of gestational sac and the degree of vascularization of gestation sac have certain value in suggesting the collateral blood supply of patients with early trimester CSP, which is helpful for the complete embolization of gestational sac in the process of UAE.