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Becker and Duchenne Muscular Dystrophy (BMD, DMD) are associated with myocardial fibrosis and abnormal cardiac energetics even in the presence of normal left ventricular ejection fraction
Journal of Cardiovascular Magnetic Resonance volume 12, Article number: O92 (2010)
BMD and DMD are X-linked abnormalities of dystrophin associated with a high rate of cardiomyopathy and eventual cardiac death. Previous magnetic resonance spectroscopy (MRS) studies have shown impaired energetics that did not correlate with echocardiographic abnormalities. Early detection of myocardial disease is clinically important in commencing heart failure therapy.
Therefore this prospective study was performed to assess cardiac function, fibrosis and energy metabolism in patients with BMD and DMD with normal left ventricular function.
Patients with BMD or DMD (n = 10) (age 39 ± 12 yrs) and normal left ventricular ejection fraction (LVEF 65.5 ± 4.3%; mean ± one standard deviation), and 10 matched healthy volunteers (age 40 ± 16 yrs) (LVEF 69.3 ± 5.3%) were scanned using a Siemens Tim Trio 3 T (Erlangen, Germany). 31P MRS was used to measure the cardiac phosphocreatine to adenosine triphosphate ratio (PCr/ATP) in the mid ventricular septum1. Anatomical and functional imaging was performed in all subjects and late gadolinium enhancement (LGE) imaging was performed in the patient group only.
The cardiac PCr/ATP ratio in the BMD/DMD patients was significantly lower than the age matched controls (BMD/DMD 1.53 ± 0.13 vs. normal controls 2.09 ± 0.13; p < 0.001, Figures 1 and 2). Myocardial fibrosis as detected by LGE was detected in all BMD/DMD patients, with preponderance for the basal inferolateral wall only (4/10), lateral wall only (3/10), and basal inferolateral and lateral walls (3/10). LGE was quantified using QMASS 7.0 (Medis, Inc.) software with a threshold of 4 standard deviations above unaffected myocardium (LGE/total mass 16.4 ± 8.9%).
BMD and DMD are characterised by myocardial fibrosis and abnormal cardiac energetics even in the absence of left ventricular systolic dysfunction. These findings suggest incipient cardiomyopathy is more prevalent in this patient population than previously thought.
Tyler DJ, Emmanuel Y, Cochlin LE, Hudsmith LE, Holloway CJ, Neubauer S, Clarke K, Robson MD: Reproducibility of 31P cardiac magnetic resonance spectroscopy at 3 T. NMR in biomedicine. 2009, 22 (4): 405-13. 10.1002/nbm.1350.
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Suttie, J.J., Dass, S., Karamitsos, T.D. et al. Becker and Duchenne Muscular Dystrophy (BMD, DMD) are associated with myocardial fibrosis and abnormal cardiac energetics even in the presence of normal left ventricular ejection fraction. J Cardiovasc Magn Reson 12 (Suppl 1), O92 (2010). https://doi.org/10.1186/1532-429X-12-S1-O92
- Muscular Dystrophy
- Late Gadolinium Enhancement
- Myocardial Fibrosis
- Duchenne Muscular Dystrophy
- Left Ventricular Systolic Dysfunction