The complete atrioventricular (AV) heart block is a rare complication in the course of systemic lupus erythematosus. We describe a case of a young woman with systemic lupus erythematosus and lupus cardiomyopathy who was admitted into our hospital with a syncopal attack showing on the electrocardiogram a paroxysmal complete AV heart block. The syncopal attack was resolved with a pacemaker implantation.