Cardiac Performance Evaluation in Patients with Muscular Dystrophy

Area of Science:

• Cardiology
• Neuromuscular Disorders
• Biomedical Engineering

Background:

• Ventriculoarterial coupling (VAC) assesses the relationship between ventricular performance and arterial stiffness.
• Muscular dystrophy (MD) is associated with various systemic complications, including cardiac involvement.

Purpose of the Study:

• To investigate if VAC is abnormal in muscular dystrophy (MD) patients.
• To determine if VAC worsens with disease progression in MD.
• To identify factors associated with abnormal VAC in MD.

Main Methods:

• Echocardiograms were used to calculate arterial elastance (Ea) and LV end-systolic elastance (Ees) in MD patients and controls.
• VAC was compared between initial and follow-up studies in MD patients.
• Regression analyses identified factors associated with VAC.

Main Results:

• MD patients exhibited significantly lower ejection fraction (EF) and Ees, and a higher VAC ratio compared to controls.
• Cardiac dysfunction worsened over the follow-up period in MD patients.
• Ambulation status was independently associated with EF and Ees at last follow-up.

Conclusions:

• Cardiac performance, measured by VAC, is impaired in MD patients and deteriorates longitudinally.
• Ambulation status is a key factor associated with cardiac dysfunction in MD.
• Findings provide mechanistic insights into cardiac dysfunction progression in MD.