Bartter's syndrome, supraventricular tachycardia, mitral valve prolapse, and asthma: a therapeutic challenge.

A 25-year-old man with acquired Bartter's syndrome, mitral valve prolapse, and supraventricular tachycardia secondary to a low atrial focus was diagnosed with asthma. The unique aspects of managing these coexisting diseases are evaluated. Calculation of free-water clearance in the diagnosis of Bartter's syndrome and the etiology and characteristics of the syndrome are discussed.