Cardiac asynchrony in Duchenne muscular dystrophy

Area of Science:

• Cardiology
• Genetics
• Neuromuscular Disorders

Background:

• Duchenne muscular dystrophy (DMD) is an inherited disorder affecting muscle, frequently leading to heart failure.
• The prevalence and characteristics of systolic dyssynchrony in DMD patients are not well-documented.
• Left ventricular (LV) dysfunction is a known complication, but its association with asynchrony requires further investigation.

Purpose of the Study:

• To evaluate the prevalence of left ventricular dysfunction in adult DMD patients.
• To assess the incidence of systolic asynchrony, both inter-ventricular and intra-ventricular, in this population.
• To explore the relationship between LV ejection fraction (EF) and the presence of systolic asynchrony.

Main Methods:

• Electrocardiography and echocardiography were performed on 48 adult DMD patients.
• Systolic asynchrony was assessed using echocardiography-Doppler and tissue Doppler imaging.
• Patients' ages ranged from 20 to 37 years.

Main Results:

• Left ventricular ejection fraction (EF) varied widely, with a median of 43%.
• Inter-ventricular asynchrony was observed in 11.9% of patients with EF < 35% and 2.6% with EF > 35%.
• Intra-ventricular asynchrony was present in 6% of patients with EF < 35%.

Conclusions:

• DMD patients exhibit a high prevalence of left ventricular dysfunction.
• Systolic ventricular asynchrony appears to be a common finding in DMD, particularly in those with significantly reduced LV function (EF < 35%).
• These findings highlight the importance of cardiac monitoring in DMD management.