To study the clinical treatment decisions of fetal superventricular tachycardia (SVT).

By analyzing retrospectively the ultrasound outcomes of 45 566 pregnant women who had systematic ultrasound examination in The Third Affiliated Hospital of Guangzhou Medical University from January 2011 to December 2015, we found that there were 59 cases (3.62‰) diagnosed with arrhythmia through fetal echocardiography and M-mode ultrasonography, including 12 cases of fetal superventricular tachycardia. Among these 12 cases, 3 cases of persistent superventricular tachycardia were given propafenone hydrochloride, metoprolol and digoxin medication respectively, while the other 9 cases were given expectation treatment.

Among the 3 cases of medicine treatment, the patient with fetal edema chose to terminate the pregnancy after treatment failure; the other 2 cases had effective outcome that fetuses were healthy. Among the 9 cases with expectation treatment, one case had intrauterine fetal death at gestational week of 13^th week, one patient occurred inevitable abortion at gestational week of 18^th week and 6 days, one patient performed cesarean delivery at gestational week of 35^th week and 6 days because of complete placenta previa, the remaining 6 cases had favorable prognosis and delivered at term.

Without fetal edema, fetuses of paroxysmal SVT got well through expectant management. The fetuses of persistent SVT without edema could recover sinus rhythm through drug therapy. While fetuses of persistent SVT complicated with severe edema, drug treatment effect is poor.