Medical Physics Research Today is a free monthly online journal that collates and summarizes the latest research about Medical Physics, including details on medicine, radiotherapy, biomechanics, medical imaging. | ||||||||
|
Manganese dipyridoxyl-diphosphate (MnDPDP) as a viability marker in patients with myocardial infarction.Skjold A, Amundsen BH, Wiseth R, Støylen A, Haraldseth O, Larsson HB, Jynge P Department of Circulation and Medical Imaging (ISB), Faculty of Medicine, Norwegian University of Science and Technology (NTNU), Trondheim, Norway. Arne.Skjold@stolav.no PURPOSE: To evaluate contrast accumulation in left ventricular (LV) myocardium after manganese dipyridoxyl-diphosphate (MnDPDP) administration in patients with recent first time myocardial infarction. MATERIALS AND METHODS: MnDPDP (5 micromol/kg) was administered to 10 patients with recent myocardial infarction (three to 12 weeks). One slice of interest (SOI) likely to traverse the infarction was chosen, and sectorial pre- and postcontrast longitudinal relaxivity rates (R(1)) and signal changes during infusion were estimated with a fast gradient echo sequence. LV volume and wall thickening were measured in short-axis cine recordings. Infarct localization from R(1) and wall thickening data were compared by vector analyses. RESULTS: Reduced wall thickening was associated with reduced precontrast R(1) and reduced contrast enhancement. Both remote and infarcted regions showed rapid initial contrast accumulation. In remote regions, this was followed by a continuing slow increase. Mean precontrast R(1) was 0.87 +/- 0.06 second(-1) in infarcted regions and 0.96 +/- 0.03 second(-1) in remote regions (P < 0.001). Mean R(1) change over one hour was 0.24 +/- 0.07 second(-1) in infarcted regions and 0.38 +/- 0.03 second(-1) in remote regions (P < 0.0001). CONCLUSION: Remote regions showed larger increases in R(1) than infarcted regions. This is most likely due to selective and slow Mn accumulation in viable myocytes. Published 4 September 2007 in J Magn Reson Imaging, 26(3): 720-7.
© 2005-2008 Medical Physics Research Today. All Rights Reserved. |
| ||||||
