Uterine artery ascending branch ligation significantly reduces postpartum hemorrhage in placenta previa cesarean sections
Background
Postpartum hemorrhage (PPH) remains a leading cause of maternal morbidity and mortality worldwide. Patients undergoing cesarean section (CS) for placenta previa are at particularly high risk due to the abnormal placental implantation and increased vascularity, often leading to substantial blood loss. Current standard-of-care often relies on uterotonic agents like oxytocin to promote uterine contraction and reduce bleeding. However, these methods may not always be sufficient for high-risk cases, highlighting a critical need for additional effective interventions to prevent severe PPH.
Study Design
A retrospective cohort study evaluated the efficacy of ascending uterine artery ligation (AUAL) in preventing PPH. The study enrolled 103 patients with placenta previa who underwent CS with concurrent AUAL. A matched control group of 134 patients with placenta previa received CS with specialized uterotonic agents (without AUAL). All participants in both groups received intraoperative and postoperative oxytocin administration. Primary endpoints included 24-hour postpartum blood loss volume and postoperative hemoglobin concentration. Numerical Rating Scale (NRS) assessed postoperative abdominal pain.
Results
No significant differences were observed between the AUAL and control groups for maternal age, gestational age, parity, uterine involution rate, or puerperal fever (P > 0.05). However, the AUAL group demonstrated significantly lower total 24-hour postpartum blood loss.
The AUAL group's blood loss averaged 495.3 ± 159.9 ml, a 23.6% reduction compared to the control group's 648.1 ± 246.8 ml (P < 0.001). This was accompanied by a smaller reduction in postoperative hemoglobin in the AUAL group (12.8 ± 5.5 g/L vs. 16.8 ± 6.8 g/L, P < 0.001). Conversely, the AUAL group experienced a significantly longer operative time (1.9 ± 0.4 h vs. 1.7 ± 0.5 h, P = 0.025) and reported more severe postoperative abdominal pain.
Key Findings
- AUAL reduced 24-hour postpartum blood loss by 152.8 ml (23.6%) compared to controls (P < 0.001).
- Postoperative hemoglobin reduction was significantly less in the AUAL group (12.8 ± 5.5 g/L vs. 16.8 ± 6.8 g/L, P < 0.001).
- AUAL increased operative time by 0.2 hours (P = 0.025).
- AUAL was associated with more severe postoperative abdominal pain.
Why It Matters
This study suggests that ascending uterine artery ligation (AUAL) is an effective surgical adjunct to significantly reduce postpartum hemorrhage in high-risk cesarean sections for placenta previa. For clinicians managing these complex cases, integrating AUAL into the surgical protocol could substantially improve maternal outcomes by minimizing blood loss and the need for transfusions. While AUAL increases operative time and postoperative pain, the benefit of reduced hemorrhage may outweigh these drawbacks, particularly in settings where blood products are scarce or for patients with specific risk factors for severe bleeding. This offers a tangible surgical strategy to enhance patient safety during a critical obstetric procedure.
postpartum hemorrhage
placenta previa
cesarean section
uterine artery ligation
maternal health
obstetrics