Muscle Pathology Associated With Cardiac Function in Duchenne Muscular Dystrophy

Area of Science:

• Biomedical Engineering
• Cardiology
• Neuromuscular Disorders

Background:

• Duchenne muscular dystrophy (DMD) is a progressive genetic disorder leading to muscle degeneration.
• Cardiac involvement is a major cause of mortality in DMD patients.
• Early detection of cardiac dysfunction is crucial for managing DMD.

Purpose of the Study:

• To compare muscle fibrosis progression across different body sites in DMD patients.
• To investigate the relationship between cardiac function and muscle fibrosis in DMD.
• To identify potential predictors of cardiac dysfunction in DMD.

Main Methods:

• Echocardiography and elastography were used to assess cardiac function and muscle fibrosis.
• Twenty-one non-ambulant male DMD patients were included.
• Spearman rank correlation coefficients analyzed relationships between cardiac function and muscle elasticity.

Main Results:

• Abdominal and quadriceps muscle fibrosis was more pronounced than medial gastrocnemius fibrosis.
• Rectus abdominis muscle fibrosis negatively correlated with left ventricular ejection fraction.
• Abdominal muscle fibrosis was the only skeletal muscle fibrosis significantly correlated with cardiac dysfunction.

Conclusions:

• Abdominal muscle fibrosis is a significant predictor of cardiac dysfunction in DMD.
• Fibrosis in respiratory muscles also associates with cardiac dysfunction, suggesting their utility as clinical predictors.