期刊
MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE
卷 25, 期 5, 页码 369-379出版社
SPRINGER
DOI: 10.1007/s10334-012-0304-0
关键词
Cardiovascular magnetic resonance; Myocardial infarction; T-2*; LGE; Mouse; Fibrosis; Hemorrhage
资金
- Netherlands Heart Foundation (NHS) [2006B066, 2010T001]
- Netherlands Heart Institute (ICIN)
- Dutch Technology Foundation STW, Applied Science Division of NWO
- Ministry of Economic Affairs [07952]
Imaging of myocardial infarct composition is essential to assess efficacy of emerging therapeutics. T (2) (*) mapping has the potential to image myocardial hemorrhage and fibrosis by virtue of its short T (2) (*) . We aimed to quantify T (2) (*) in acute and chronic myocardial ischemia/reperfusion (I/R) injury in mice. I/R-injury was induced in C57BL/6 mice (n = 9). Sham-operated mice (n = 8) served as controls. MRI was performed at baseline, and 1, 7 and 28 days after surgery. MRI at 9.4 T consisted of Cine, T (2) (*) mapping and late-gadolinium-enhancement (LGE). Mice (n = 6) were histologically assessed for hemorrhage and collagen in the fibrotic scar. Baseline T (2) (*) values were 17.1 +/- A 2.0 ms. At day 1, LGE displayed a homogeneous infarct enhancement. T (2) (*) in infarct (12.0 +/- A 1.1 ms) and remote myocardium (13.9 +/- A 0.8 ms) was lower than at baseline. On days 7 and 28, LGE was heterogeneous. T (2) (*) in the infarct decreased to 7.9 +/- A 0.7 and 6.4 +/- A 0.7 ms, whereas T (2) (*) values in the remote myocardium were 14.2 +/- A 1.1 and 15.6 +/- A 1.0 ms. Histology revealed deposition of iron and collagen in parallel with decreased T (2) (*) . T (2) (*) values are dynamic during infarct development and decrease significantly during scar maturation. In the acute phase, T (2) (*) values in infarcted myocardium differ significantly from those in the chronic phase. T (2) (*) mapping was able to confirm the presence of a chronic infarction in cases where LGE was inconclusive. Hence, T (2) (*) may be used to discriminate between acute and chronic infarctions.
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