Neonatal lupus: fetal myocarditis progressing to atrioventricular block in triplets

We report a case of neonatal lupus syndrome (NLS) in an in vitro fertilization induced triplet pregnancy. Echocardiographicsigns of myocarditiswere evident at the 21st week of gestation(w.g.) in twin I, with a subsequentdevelopmentof a complete atrioventricular(AV) block at the 25th w.g.; twin III also displayed echocardiographic signs of myocarditis at the same time. Treatment with dexamethasone (4mg/day) was started at the 25th w.g. A complete echocardiographicregression of the myocarditis signs was achieved, while AV block was unaffected.Caesarian section was performed at the 31.5 w.g. after a premature rupture of the membranes. Complete AV block was confirmed in twin I with a heart rate of 51beats/min that required a pacemaker implant 40 days after. Twin III developed a first-degree AV block that switched to a periodic second-degreeblock later, while twin II displayed only liver enzyme abnormalities.