[A case of systemic lupus erythematosus discovered from left heart failure due to lupus induced mitral regurgitation].

A 50-year-old female was admitted to a local hospital because of dyspnea, and diagnosed as having left heart failure secondary to mitral regurgitation. After the improvement of congestive heart failure, polyarthralgia, fever, and positive anti-nuclear antibody were pointed out. She was referred to our hospital for the further evaluation. Serological test showed anti-double stranded DNA antibodies, anti-SS-A antibodies, anti-beta 2-GPI antibodies and biological false positive for syphilis. The diagnosis of SLE has been made from the clinical signs and the serology. Therefore mitral valvular lesion of this patient was considered to be one of the symptoms of SLE. We reported a rare case in which left heart failure was a initial clinical manifestation of SLE.