We report two patients referred to 2 day stress-rest single photon emission computed
tomography for diagnosis of ischemia who elicited a transient left bundle branch block
during dipyridamole intravenous infusion. The conduction disturbance disappeared after
aminophyline infusion and became permanent during follow-up. Possible mechanisms underlying
this unusual phenomenon in the absence of myocardial ischemia are discussed.
Keywords
Dipyridamole - single photon emission computed tomography - transient left bundle
branch block
