A Case of Neonatal Lupus Presenting with Myocardial Dysfunction in the Absence of Congenital Heart Block (CHB): Clinical Management and Brief Literature Review of Neonatal Cardiac Lupus.

Neonatal lupus (NLE) is a rare acquired autoimmune disorder caused by transplacental passage of maternal autoantibodies to Sjogren's Syndrome A or B (SSA-SSB) autoantigens (Vanoni et al. in Clin Rev Allerg Immunol 53:469-476, 2017) which target fetal and neonatal tissues for immune destruction. The cardiac trademark of NLE is autoimmune heart block, which accounts for more than 80% of cases of complete atrioventricular heart block (AVB) in newborns with a structurally normal heart (Martin in Cardiol Young 24: 41-46, 2014). NLE presenting with cardiac alterations not involving rhythm disturbances are described in the literature, but they are rare. Here, we report a case of a neonate with high anti-SSA antibodies who developed severe ventricular dysfunction in the absence of rhythm abnormalities, endocardial fibroelastosis, and dilated cardiomyopathy (Trucco et al. in J Am Coll Cardiol 57:715-723, https://doi.org/10.1016/j.jacc.2010.09.044 , 2011), the most common cardiac presentations of NLE. The patient developed severe multiorgan dysfunction syndrome that required prolonged critical care support but fully recovered and was discharged home. We highlight the unusual clinical features of this NLE case and the importance of timely treatment of NLE allowing complete recovery of a critically ill neonate.