Sick sinus syndrome: 21 years follow-up.

A case of sick sinus syndrome, which was originally diagnosed during 1958, had an extensive followup for over 20 years by several clinicians. He showed a wide spectrum of associated rhythm disorders includ-tng sinus irregularity, extrasystoles, paroxysmal supraventricular tachycardia and Wenkebach's phenomenon. He remained physically fit and active, and did not require active medications, and died in an air crash.