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T1 mapping is abnormal before decline in EF in patients with Becker and Duchenne muscular dystrophy
Journal of Cardiovascular Magnetic Resonance volume 15, Article number: P149 (2013)
Patients with Duchenne muscular dystrophy (DMD) develop cardiomyopathy (CM) at an earlier age compared to Becker muscular dystrophy (BMD), but the age of onset within each diagnosis is variable. A method to predict CM onset associated with dystrophinopathy could alter therapeutic approaches and improve outcomes. Shortened post-contrast T1 relaxation times are an early marker of myocardial fibrosis and are abnormal in patients with DMD as described in our previous work. To our knowledge, T1 mapping has not been evaluated in BMD patients. We hypothesized that patients with BMD would also have abnormal T1 times and that these abnormalities would precede LV dysfunction.
Twenty-six CMR scans from these 2 dystrophinopathy populations (N=5 BMD and N=21 DMD) were compared with 10 CMR scans from control patients without cardiovascular disease. T1 maps were created from the Look-Locker sequence, obtained 10 minutes after gadolinium injection, using MRMap. Using MatLab, T1 times were obtained for every voxel in 6 standard myocardial segments in the short axis at the level of the papillary muscles. Mean T1 times were compared between BMD, DMD and controls using a Kruskal Wallis test. A subset of patients with normal LVEF and dystrophinopathy (BMD or DMD) was compared to controls using a Mann-Whitney U test.
The mean age of patients was 25.4 ± 8.1 years in the BMD group, 15.7 ± 4.3 years in the DMD group, and 16.9 ± 1.3 years in controls. One patient with BMD and 13 patients with DMD had LVEF < 55%. Two patients from both BMD and DMD had LV dilatation. BMD and DMD patients had significantly shorter mean post-contrast T1 compared with controls (BMD: 355 ms, 95% CI (314, 395), DMD:357 ms, 95% CI (323, 390), control: 420 ms, 95% CI (389, 451), p=0.035) (Figure 1). The subset of BMD and DMD patients and normal LVEF also had a significant decrease in post-contrast T1 when compared to controls (-52.4 ms, 95% CI (-7.2, -97.5), p=0.018) (Figure 2).
Myocardial post-contrast T1 relaxation times in BMD and DMD are significantly shorter than in controls. They remain significantly decreased in the subset of patients with normal LVEF, suggesting that CMR may have prognostic utility in detecting subclinical myocardial damage associated with loss of dystrophin prior to a decline in LVEF. Further longitudinal study is necessary to evaluate whether T1 times can predict future onset of CM in BMD and DMD.
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Soslow, J.H., Damon, B.M., Burnette, W.B. et al. T1 mapping is abnormal before decline in EF in patients with Becker and Duchenne muscular dystrophy. J Cardiovasc Magn Reson 15, P149 (2013). https://doi.org/10.1186/1532-429X-15-S1-P149
- Duchenne Muscular Dystrophy
- Myocardial Fibrosis
- Duchenne Muscular Dystrophy
- Duchenne Muscular Dystrophy Patient
- Prognostic Utility