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J Am Coll Cardiol. 2016 Apr 19;67(15):1800-1811. doi: 10.1016/j.jacc.2016.02.013.

Comprehensive Cardiac Magnetic Resonance Imaging in Patients With Suspected Myocarditis: The MyoRacer-Trial.

Author information

1
Department of Internal Medicine/Cardiology, University of Leipzig-Heart Center, Leipzig, Germany. Electronic address: Philipp.Lurz@gmx.de.
2
Department of Diagnostic and Interventional Radiology, University of Leipzig-Heart Center, Leipzig, Germany.
3
University Heart Center Luebeck, University of Schleswig-Holstein, Medical Clinic II (Cardiology, Angiology, Intensive Care Medicine), Luebeck, Germany; German Centre for Cardiovascular Research (DZHK), Partner Site Hamburg/Kiel/Lübeck, Luebeck, Germany.
4
Department of Internal Medicine/Cardiology, University of Leipzig-Heart Center, Leipzig, Germany.
5
Department of Electrophysiology, University of Leipzig-Heart Center, Leipzig, Germany.
6
Department of Molecular Pathology, University Hospital Tuebingen, Tuebingen, Germany.

Abstract

BACKGROUND:

Data suggest that T1 and T2 mapping have excellent diagnostic accuracy in patients with suspected myocarditis. However, the true diagnostic performance of comprehensive cardiac magnetic resonance (CMR) mapping versus endomyocardial biopsy (EMB) has not been determined.

OBJECTIVES:

This study assessed the performance of CMR imaging, including T1 and T2 mapping, compared with EMB in an unselected, consecutive patient cohort with suspected myocarditis. It also examined the potential role of CMR field strength by comparing 1.5-T versus 3.0-T imaging.

METHODS:

Patients underwent biventricular EMB, cardiac catheterization (for exclusion of coronary artery disease), and CMR imaging on 1.5- and 3-T scanners. The CMR protocol included current standard Lake Louise criteria (LLC) for myocarditis as well as native T1, calculation of extracellular volume fraction (ECV), and T2 mapping (only on 1.5-T). Patients were divided into 2 groups according to symptom duration (acute: ≤14 days vs. chronic: >14 days).

RESULTS:

A total of 129 patients underwent 1.5-T imaging. In patients with acute symptoms, native T1 yielded the best diagnostic performance as defined by the area under the curve (AUC) of receiver-operating curves (0.82) followed by T2 (0.81), ECV (0.75), and LLC (0.56). In patients with chronic symptoms, only T2 mapping yielded an acceptable AUC (0.77). On 3.0-T, AUCs of native T1, ECV, and LLC were comparable to 1.5-T with no significant differences.

CONCLUSIONS:

In patients with acute symptoms, mapping techniques provide a useful tool for confirming or rejecting the diagnosis of myocarditis and are superior to the LLC. However, only T2 mapping has acceptable diagnostic performance in patients with chronic symptoms. (Magnetic Resonance Imaging in Myocarditis [MyoRacer]; NCT02177630).

KEYWORDS:

endomyocardial biopsy; extracellular volume; mapping; myocardial inflammation

PMID:
27081020
DOI:
10.1016/j.jacc.2016.02.013
[Indexed for MEDLINE]
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