Redistribution of thallium

Myocardial thallium-201 activity in normal and ischemic dog myocardium. Serial determination of myocardial thallium-201 activity (expressed as percent of initial normal activity) in 27 dogs is measured after 20 minutes of coronary artery occlusion and before reflow. Near equalization of thallium-201 activity in normal and previously ischemic myocardial regions appears by four hours after reperfusion.