摘要
Objective To assess the effects of Dy DTPA BMA (sprodiamide) on ex vivo MR imaging of reperfused acute myocardial infarction Methods Eighteen dogs were subjected to 2 hour coronary artery occlusion followed by 24 hour reperfusion Dysprosium chelate (Dy DTPA BMA) was injected into 16 dogs Twenty minutes before their sacrifice Two dogs did not receive the contrast medium and were used as controls Excised hearts were imaged on T2 weighted spin echo sequence (T2W SE) and T2 * weighted gradient recalled echo sequence (T2 *W GRE), then sectioned and double perfused for planimetric comparison Results Dy DTPA BMA induced myocardial signal loss was detected on T2W SE and on T2 *W GRE images The signal loss was observed at the subendocardial location of the myocardial wall inducing an apparent enlargement of the left ventricle cavity and a thinning appearance of the anterior myocardial wall Conclusions Myocyte necrosis diminishes the potency of dysprosium to cause MR imaging signal intensity loss in reperfused myocardial infarction Pre infarcted myocardium with potentially reversible viability may be responsible for the effect of the contrast medium
Objective To assess the effects of Dy DTPA BMA (sprodiamide) on ex vivo MR imaging of reperfused acute myocardial infarction Methods Eighteen dogs were subjected to 2 hour coronary artery occlusion followed by 24 hour reperfusion Dysprosium chelate (Dy DTPA BMA) was injected into 16 dogs Twenty minutes before their sacrifice Two dogs did not receive the contrast medium and were used as controls Excised hearts were imaged on T2 weighted spin echo sequence (T2W SE) and T2 * weighted gradient recalled echo sequence (T2 *W GRE), then sectioned and double perfused for planimetric comparison Results Dy DTPA BMA induced myocardial signal loss was detected on T2W SE and on T2 *W GRE images The signal loss was observed at the subendocardial location of the myocardial wall inducing an apparent enlargement of the left ventricle cavity and a thinning appearance of the anterior myocardial wall Conclusions Myocyte necrosis diminishes the potency of dysprosium to cause MR imaging signal intensity loss in reperfused myocardial infarction Pre infarcted myocardium with potentially reversible viability may be responsible for the effect of the contrast medium
