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Cardiac dysfunction with Becker muscular dystrophy

M Saito1, H Kawai, M Akaike

  • 1First Department of Internal Medicine, School of Medicine, University of Tokushima, Japan.

American Heart Journal
|September 1, 1996
PubMed
Summary
This summary is machine-generated.

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Becker muscular dystrophy (BMD) patients show distinct cardiac abnormalities, including higher preejection/ejection time ratios and increased left ventricular dimensions compared to Duchenne muscular dystrophy (DMD) patients and healthy controls. These findings suggest a predisposition to dilated cardiomyopathy and mitral regurgitation in BMD.

Area of Science:

  • Cardiology
  • Neurology
  • Genetics

Background:

  • Becker muscular dystrophy (BMD) and Duchenne muscular dystrophy (DMD) are X-linked neuromuscular disorders affecting cardiac function.
  • Cardiac involvement is a significant concern in muscular dystrophies, impacting patient prognosis.

Purpose of the Study:

  • To compare cardiac function in patients with BMD, DMD, and healthy controls.
  • To investigate the specific cardiac manifestations and potential mechanisms leading to cardiomyopathy in BMD.

Main Methods:

  • Cardiac function assessment in 21 BMD patients, 43 DMD patients, and 37 healthy controls.
  • Utilized electrocardiography (ECG) and echocardiography to evaluate myocardial damage, ventricular dimensions, and mitral valve function.
  • Correlated cardiac findings with dystrophin gene locus deletions.

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Main Results:

  • Myocardial damage in BMD patients was predominantly observed in the lateral wall.
  • The preejection period to ejection time ratio was significantly higher in BMD patients (0.37 ± 0.07) compared to DMD patients (0.28 ± 0.05) and controls (0.23 ± 0.04).
  • BMD patients exhibited age-related increases in left ventricular dimensions and mitral annular size; 66.7% of BMD patients with cardiac failure showed mitral regurgitation.

Conclusions:

  • Cardiac dysfunction in BMD differs from DMD, characterized by a higher preejection/ejection time ratio and a propensity for dilated cardiomyopathy with mitral regurgitation.
  • Prolonged workload on the myocardium due to slower motor progression in BMD may contribute to cardiac pathology.
  • No direct correlation was found between the specific deleted dystrophin gene locus and the severity of cardiac failure.