[Congenital heart block in a newborn infant born to a mother with lupus erythematosus].

We report a case of a newborn with a congenital heart-block. Clinical picture began with bradycardia and heart failure from birth. The mother had a systemic lupus erythematosus in remission during pregnancy suffering a reactivation after delivery. This report deals about the greater incidence of congenital heart-block in the lupus-mother's newborns and we expose some etiopathogenic hypothesis. Also we point-out the easy clinical and electrocardiographic diagnosis that shows a third degree heart-block with atrioventricular dissociation and atrial frequency two or three times greater than ventricular. It's established the differential diagnosis among neonatal bradycardias and congenital heart-blocks. The treatment with isoproterenol was ineffective. A pacemaker was need.