Moderator band calcification masquerading infrahisian conduction system disease

Abstract

Relationship between moderator band (MB) calcification and infrahisian conduction system disease has not been described in the world literature so far. We report a case of a 74-year old male presenting with recurrent cardiogenic syncope 6 times is the last 2 months.He had echocardiographic evidence of dense moderator band calcification.Electrophysiology study revealed a His-Ventricular(HV) interval of 100 msec suggestive of significant infrahisian conduction system disease.He was put on a dual chamber pacemaker and he had no further episode of syncope during the follow up. Our description is unique and the first in the world literature that dense MB calcification in echocardiography may be an indirect clue to the presence of severe infrahisian conduction system disease.

Keywords

• band
• calcification
• conduction
• disease
• infrahisian
• moderator
• system