Background: Preeclampsia is a pregnancy-related hypertensive disorder that greatly increases maternal and perinatal morbidity and mortality, especially in primigravida women. L-arginine, a nitric oxide precursor, may enhance endothelial function and reduce blood pressure. This study investigates its effectiveness in preventing preeclampsia among primigravida women at increased risk.
Methods: This one-year quasi-experimental study included 100 primigravida women (aged 18–40, at 13 weeks’ gestation) with a family history of hypertensive disorders. Participants were randomly divided into two groups of 50. Group A received 1,000 mg of L-arginine daily plus standard antenatal care; Group B received standard care only. Follow-up occurred every four weeks until delivery, monitoring blood pressure, urine protein, and side effects. Outcomes included preeclampsia, maternal, and neonatal complications. Statistical analysis used t-tests and Chi-square tests.
Results: The incidence of preeclampsia was lower in the intervention group (12%) than in the control group (28%), though this difference did not reach statistical significance (P=0.06). Mean gestational age at delivery was significantly higher in the intervention group (37.70±1.52 vs. 36.04±2.24 weeks; P<0.001), with considerably lower rates of preterm birth (34% vs. 74%; P<0.001) and higher birth weight (2,916.02±455.11 vs. 2,735.24±424.49 g; P=0.04). Vaginal delivery was more frequent (80% vs. 60%; P=0.04), and blood pressure at delivery was significantly lower (P<0.001). No serious adverse effects were reported.
Conclusion: L-arginine supplementation as a routine antenatal care appears to be a safe and effective approach to lowering the risk of preeclampsia in primigravida women. Its early use may provide a valuable, non-pharmacological preventive strategy within standard prenatal care practices
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