Abstract
This retrospective cohort study investigates the risk factors and beta-human chorionic gonadotropin (β-hCG) trends in patients with ruptured tubal ectopic pregnancies (EPs) despite methotrexate (MTX) treatment. All patients receiving MTX for sonographically confirmed tubal EPs at our fertility center between 2004 and 2014 were included. Baseline demographics and β-hCG trends of patients with EP rupture after MTX were compared to patients with resolved EPs after MTX. One-hundred-thirty-seven patients with EPs were treated with MTX during the study duration; 27 experienced EP rupture and 110 EP resolution. There was no difference in the baseline demographics or β-hCG levels on the day of MTX between the groups. Patients with ruptured EPs after MTX had higher β-hCG levels on day-4 (1223.9 ± 243.5 vs. 1111.2 ± 179.7 mIU/mL; p < .001) and day-7 (1156.9 ± 206.2 vs. 872.4 ± 690.2 mIU/mL; p < .001). The odds of EP rupture compared to EP resolution was 6.2 (95% CI 2.1–19.1), 13.7 (95% CI 4.8–38.9), and 3.0 (95% CI 1.2–7.2) times higher when the change in β-hCG levels was <5% between day-7 vs. day of MTX, day-7 vs. day-4, and day-4 vs. day of MTX, respectively. Our results demonstrate that ruptured tubal EPs despite MTX have <5% change in β-hCG levels between the day of MTX and day-4 or day-7 after MTX.
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