Prenatal Diagnosis and Postnatal Outcomes of Persistent Left Superior Vena Cava Associated With Mild Narrow Aorta A Cohort Study

Purpose-To explore prenatal ultrasonic features and prognosis of persistent left superior vena cava (PLSVC) complicated with mild narrow aorta. Materials and Methods-A retrospective study was conducted involving 1348 fetuses diagnosed with PLSVC prenatally between January 2016 and December 2019. Forty-five fetuses with PLSVC associated with mild narrow aorta were selected from the cohort as study group and 79 fetuses with isolated PLSCV were recruited randomly as control group. All clinical and ultrasound results, including images and parameters of cardiac structures, were reviewed retrospectively. General conditions, ultrasound (US) measurements, and fetal prognosis were compared between the groups. Results-Aorta valve diameter (AOD), Z-score of aorta valve (AOD(z-score)), aortic isthmus diameter (AOIsD), and pulmonary diameter (PAD)/AOD were significantly different in study group than control group no matter in the second or third trimester. Thirty-eight fetuses in study group were born with favorable outcomes after long-term follow-up. A total of 13.16% (5/38) remain mild narrow aorta and 3 of them showed smaller left ventricle after 3 years follow up. Prenatal AOD(z-score) in infants remains mild narrow aorta after 2 years aged was higher than ones' aorta return to normal (P = .01), especially when AOD(z-score) >1.725. Moreover, when prenatal ratio of AOIsD/left subclavian artery was <1.12, it was more likely that the aorta would remain mildly narrow at age 2. Conclusion-Fetuses diagnosed with PLSVC with mild narrow aorta had favorable prognosis. AOD(z-score) and AOIsD/left subclavian artery may be two predictors that reveal the risk of a mildly narrowed aorta remaining after birth.