A study on the timing of uterine artery embolization followed by pregnancy excision for cesarean scar pregnancy: a prospective study in China

Background Cesarean scar pregnancy (CSP) remains a sporadic and special form of ectopic pregnancy in which the fertilized ovum is implanted on a previous cesarean scar within 12 weeks. This study aims to evaluate the optimal time interval between uterine artery embolization (UAE) and curettage modalities in order to provide the best clinical outcomes. Methods From January 2018 to December 2020, we recruited 61 patients with CSP. They were randomly divided into two groups depending on whether the time interval between UAE and dilatation and curettage (D&C) requires additional hospitalization: 31 patients received prophylactic UAE followed by D&C on the same day (0-12 h; group A) and 30 patients need hospitalization (12-72 h; group B). The clinical characteristics, diagnostic data, and outcomes of the two groups were compared and analyzed. Results A total of 59 (96.72%) cases had responded well to the first treatment. One patient in each arm undergone retreatment, but none of the 61 patients needed additional hysterectomy. There was no considerable relationship between the two groups with respect to the intraoperative hemorrhage during D&C, serum index (containing beta-hCG, hemoglobin, CRP, and D-dimer) on the first day after D&C, side effects (containing fever and abdominal pain), renal, hepatic, and coagulation function, time of CSP residual mass disappearance, and hospitalization cost. The time of serum beta-hCG resolution after surgery was 41.22 +/- 14.97 days in group A and 66.67 +/- 36.64 days in group B (P = 0.027), and group A treatment resulted in a shorten hospital stay as compared with group B (4.81 +/- 2.74 days vs. 6.80 +/- 2.14 days, P < 0.001). However, the average hourly serum beta-hCG decrease rate within 24 h and the leukocytes on the first day after D&C in group B were superior than in group A (P < 0.050). Conclusion For patients with CSP, UAE followed by D&C on the same day (0-12 h) appears to have more advantages in hospitalization and recovery time, while the long time interval (12-72 h) may have a lower risk of inflammation and a more rapid decrease in serum beta-hCG level within 24 h after D&C surgery. The treatment of CSP should be individualized based on the conditions of patients.