Dysrhythmia update. Differential diagnosis of supraventricular tachycardia in an elderly man.

An 82-year-old man was admitted to the hospital with a narrow complex tachycardia. This article presents his case history, examples of the dysrhythmia, and a differential diagnosis approach to identifying the source of the tachycardia. The mechanism of the tachycardia is described and diagrammed and the follow-up care of the patient presented.