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Manganese dipyridoxyl‐diphosphate (MnDPDP) as a viability marker in patients with myocardial infarction
Author(s) -
Skjold Arne,
Amundsen Brage H.,
Wiseth Rune,
Støylen Asbjørn,
Haraldseth Olav,
Larsson Henrik B.W.,
Jynge Per
Publication year - 2007
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.21065
Subject(s) - medicine , myocardial infarction , thickening , infarction , cardiology , magnetic resonance imaging , nuclear medicine , radiology , chemistry , polymer science
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 μmol/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. J. Magn. Reson. Imaging 2007;26:720–727. © 2007 Wiley‐Liss, Inc.