Effect of previous cesarean sections on second-trimester uterine artery Doppler

Aim In this study, we investigated the effects of previous cesarean sections on uterine artery Doppler indices. Methods This prospective cohort study included 153 healthy pregnant women between 18 and 24 weeks of gestation. Seventy-three pregnant women without previous cesarean sections (control group) and 80 pregnant women with previous cesarean sections (study group) were compared in terms of uterine artery Doppler indices. Results The mean uterine artery pulsatility index (PI) MoM value was 1.18 +/- 0.40 in the study group and 1.07 +/- 0.35 in the control group (P= 0.046). The number of patients with uterine artery PI values above 95 percentile was 18 (22.5%) in the study group and 5(6.8%) in the control group (P= 0.007). The mean gestational age at birth was significantly lower in the study group (38.2 +/- 1.3 vs. 39 +/- 1.0,P < 0.001). There was no significant difference between the mean PI, resistance index (RI) and systolic/diastolic (S/D) ratio values of the uterine artery (P= 0.16, 0.11, 0.08, respectively). When the comparison was made with the number of previous cesarean sections, all three index values of the patients who had had more than two cesarean sections were found to be significantly higher. Conclusion The Doppler flow indices of the uterine artery significantly increased in patients with more than two previous cesarean sections. When evaluating uterine artery Doppler indices in pregnant women with a history of previous cesarean sections, these factors should be considered.