Pacemaker catheter-induced systolic murmur.

Extracardiac sounds secondary to cardiac pacing are well known, but the murmurs originating in the heart after pacemaker insertion are rare. A patient who developed musical systolic murmur following temporary transvenous endocardial pacemaker insertion is described. It is concluded that the murmur was produced by vibrations caused by the pacing catheter and the tricuspid valve or some other intracardiac structure.