A case study of a pregnant patient with a congenital heart block accompanied by left isomerism and uncontrolled type 2 diabetes who was treated successfully with ritodrine.

We present a case study of a patient with a congenital heart block associated with a left isomerism that was diagnosed during the 26th week of gestation. The mother had type 2 diabetes mellitus that was difficult to control during the early stages of the pregnancy. A fetal echocardiogram revealed an atrioventricular dissociation, with an atrial rate of 120 bpm and a ventricular rate of 55 bpm. Subsequent examinations also revealed a left isomerism in the fetus. To increase the fetal heart rate, a continuous intravenous infusion of ritodrine was administered. The fetal ventricular rate rapidly increased to 65 bpm. The pregnancy successfully continued until term and a female infant weighing 3,182 g was born via a cesarean section. A subsequent surgery was performed to provide the infant with a permanent cardiac pacemaker, and notably, the child is now 4 months of age and her growth has been within the normal range.