Abstract
Introduction
This study evaluated the ability of T1 and T2 mapping cardiovascular magnetic resonance (CMR) to detect myocardial injury in apparently normal myocardium of patients with myocarditis.
Materials and methods
We included 20 patients with “infarct-like” acute myocarditis who had typical focal myocardial lesions on late gadolinium enhancement (LGE) images as well as 20 healthy controls. The CMR protocol consisted of a standard myocarditis protocol which was combined with T1 (modified Look-Locker inversion recovery (MOLLI) with a 3(3)5 scheme and T2 mapping (hybrid gradient- and spin-echo multi-echo sequence, GraSE). First, LGE images were used to depict focal myocardial injury and apparently normal, remote myocardium. Second, native T1, T2 and ECV values were obtained in focal lesions but also in apparently normal myocardium. Third, native T1, T2 and ECV values ≥2 standard deviations above reference values obtained in healthy volunteers were used to quantify myocardial injury in patients with myocarditis.
Results
Apparently normal myocardium had significantly higher median native T1 [1095 (1055–1148) ms] and ECV [34 (32–35) %] values compared to reference values from healthy volunteers, which were 1051 (1021–1064) ms (p < 0.01) and 26 (24–27) % (p < 0.0001). Furthermore, a nonsignificant increase in median myocardial T2 was detected in apparently normal myocardium of patients with myocarditis compared to healthy volunteers [59 (55–65) vs. 56 (54–60) ms; p = 0.18]. Consequently, the amount of myocardial injury was significantly larger on native T1 [48 (32–56) %; p < 0.01] and ECV maps [58 (50–66) %; p < 0.01] compared to LGE [14 (9–20) %].
Conclusions
Native T1 and ECV maps reveal hidden myocardial injury in normal appearing myocardium of patients with myocarditis. The amount of myocardial injury in myocarditis was underestimated by conventional LGE imaging.
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Abbreviations
- AVS:
-
Acquired voxel size
- CMR:
-
Cardiovascular magnetic resonance
- ECV:
-
Extracellular volume
- HeAT:
-
Heart analysis tool
- IQR:
-
Interquartile range
- LGE:
-
Late gadolinium enhancement
- MOLLI:
-
Modified Look-Locker inversion recovery
- RVS:
-
Reconstructed voxel size
- SFP:
-
Steady-state free precession
- T2w:
-
T2-weighted
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Christian Stehning is an employee of Philips Research Germany and Dr. Schnackenburg is an employee of Philips Healthcare Germany. The other authors do not have relationships relevant to the contents of this paper to disclose.
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Radunski, U.K., Lund, G.K., Säring, D. et al. T1 and T2 mapping cardiovascular magnetic resonance imaging techniques reveal unapparent myocardial injury in patients with myocarditis. Clin Res Cardiol 106, 10–17 (2017). https://doi.org/10.1007/s00392-016-1018-5
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DOI: https://doi.org/10.1007/s00392-016-1018-5