Maternal Outcomes Associated with Delayed Cord Clamping in Hypertensive Disorders of Pregnancy: A Cross-Sectional Study.

Delayed umbilical cord clamping (DCC) is widely recommended for neonatal benefit; however, concerns persist among professionals that DCC may increase the risk of postpartum hemorrhage. There is a higher risk of postpartum hemorrhage in women with hypertensive disorders of pregnancy (HDP). We aimed to evaluate the association between umbilical cord clamping timing and maternal blood loss in term pregnancies, including those complicated by HDP. We conducted a cross-sectional study of women delivering at three major hospitals in Almaty, Kazakhstan (August 2020-March 2021). The primary outcome was maternal blood loss. Secondary outcomes included hemoglobin (Hb) and red blood cell (RBC) change from pre-delivery to discharge. Multivariable models were adjusted for maternal age, parity and hypertension category. Two hundred and seven women were analyzed (early cord clamping ≤ 60 (ECC) n = 21; delayed cord clamping 60-119 s (DCC60s) n = 161; delayed cord clamping ≥ 120 s (DCC120s) n = 25). Baseline characteristics were similar across groups except for hypertension distribution. Median blood loss did not differ significantly (255-260 mL; p = 0.9128). Adjusted models confirmed no association between clamping category and blood loss (RoM: ECC vs. DCC60s 0.97; 95% CI 0.93-1.01; DCC120s vs. DCC60s 1.01; 95% CI 0.96-1.07). Among term births in Almaty, including HDP-affected pregnancies, delayed umbilical cord clamping was not associated with increased maternal blood loss or hematologic decline. These findings indicate that DCC does not appear to increase maternal bleeding risk in high-risk obstetric populations and are broadly in line with current international recommendations. Further prospective research is warranted to evaluate specific subgroups, including severe preeclampsia.