OBJECTIVESTo investigate the clinical situation and pregnancy outcome of pregnant women with pulmonary arterial hypertension (PAH).METHODSA retrospective analysis was conducted on 125 pregnant women with varying degrees of PAH who were treated in the Department of Obstetrics and Gynecology of the First Affiliated Hospital of the University of Science and Technology between January 2016 and January 2023. The patients were divided into the mild group (58 cases), the moderate group (42 cases), and the severe group (25 cases) based on the pulmonary artery systolic blood pressure (PASBP) measurements. Mild was considered as PASBP 30-49 mmHg, moderate as PASBP 50-79 mmHg, and severe as PASBP ≥80 mmHg. The clinical data, cardiac function grade, etiology, and pregnancy outcome of the pregnant women with different degrees of severity of PASBP were analyzed.RESULTSOut of the 125 cases, the primary cause of PAH was congenital heart disease in 46 cases, followed by idiopathic heart disease in 32 cases, preeclampsia in 30 cases, rheumatic heart disease in 10 cases, and perinatal cardiomyopathy in 7 cases. A significant correlation was observed between the severity of PAH and the cardiac function grade, indicating that higher PASBP levels were associated with worse cardiac function (New York Heart Association functional classification system) (p < .05). Most deliveries were conducted via cesarean section, predominantly under intraspinal anesthesia. It was found that as the severity of PAH increased, there was a corresponding escalation in the incidence of adverse outcomes, including preterm birth, neonatal asphyxia, the need for intensive-care-unit transfer for both mothers and newborns, maternal death, perinatal death, extended postoperative hospital stay, and increased hospital expenses (p < .05).CONCLUSIONSThe higher the pulmonary artery pressure, the worse the prognosis and outcome in pregnant patients with severe PAH.