Myocardial perfusion imaging is indicated in some patients who are unable to perform treadmill exercise because of orthopedic or other problems. In such patients the cardiac effect of exercise stress can be simulated by the intravenous administration of a coronary vasodilator such as Dipyridamole (Persantine) or Adenosine. The imaging of the heart proceeds as described in the “Exercise Myocardial Perfusion Imaging” procedure, except an intravenous injection of Dipyridamole or Adenosine replaces the treadmill exercise portion of the test.
Since caffeine alters the efficacy of the test, it is essential that no coffee, tea or caffeine containing beverages or medications be consumed after midnight prior to the test.