Abstract
Object
This study has two objectives: (1) to compare the kinetics of low diffusion P846 with Gd-DOTA using inversion recovery echo planar (IR-EPI) magnetic resonance (MR) imaging and (2) to determine the potential of P846 in defining myocardial viability in hearts subjected to various injuries using T1-weighted spin echo (T1-SE).
Materials and methods
Rats were subjected to (1) occlusive infarcts (n = 16), (2) reperfused ischemic injuries (n = 8) or (3) reperfused infarcts (n = 16). A dose of 0.05 mmol/kg P846 was compared to 0.1 mmol/kg Gd-DOTA. IR-EPI and T1-SE images were obtained during 60 min. T1, ΔR1 and ΔR1 ratio were measured on IR-EPI. Infarct extents were evaluated on T1-SE and compared with histochemical staining.
Results
Blood ΔR1 was higher at 5 min after P846 (6.36 ± 0.32 s−1) than after Gd-DOTA (1.30 ± 0.14 s−1; P < 0.001). With P846, occlusive infarcts appeared as a hypoenhanced region surrounded by a hyperenhanced rim that lasted for 60 min. The increase in the ΔR1 ratio value was slower after P846 than with Gd-DOTA in the reperfused infarcts, suggesting low diffusion/convection of P846. Gd-DOTA homogenously enhanced both occlusive and reperfused infarcts at 30 min.
Conclusion
P846 provides better contrast and extended discrimination between occlusive and reperfused infarcts compared with Gd-DOTA. The gadolinium dose could be reduced with P846.
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Drs. Philippe Robert PhD, Claire Corot PhD are employees at Guerbet Group, Paris, France. Preliminary data were reported at the Joint Annual Meeting’s ISMRM-ESMRMB, Berlin, Germany, May 2007.
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Jacquier, A., Bucknor, M., Do, L. et al. P846, a new gadolinium based low diffusion magnetic resonance contrast agent, in characterizing occlusive infarcts, reperfused ischemic myocardium and reperfused infarcts in rats. Magn Reson Mater Phy 21, 207–218 (2008). https://doi.org/10.1007/s10334-008-0112-8
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DOI: https://doi.org/10.1007/s10334-008-0112-8