Abstract
Intravenous dipyridamole was given for routine thallium-201 myocardial perfusion imaging. The patient developed chest discomfort followed by cardiovascular collapse with sinus arrest and a nodal escape rhythm at 28 beats per minute. He was rapidly resuscitated without adverse sequelae. A reversible posteroinferior perfusion defect and proximal right coronary artery occlusion were found. Symptomatic bradycardia after dipyridamole may be mediated by ischaemia.
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