Cardiac features of Emery-Dreifuss muscular dystrophy caused by lamin A/C gene mutations

Area of Science:

• Cardiology
• Genetics
• Neurology

Background:

• Mutations in the lamin A/C (LMNA) gene are linked to dilated cardiomyopathy, atrioventricular conduction disturbances, and sudden death.
• The cardiac manifestations in patients initially diagnosed with Emery-Dreifuss muscular dystrophy (EDMD) due to LMNA mutations are not well-characterized.

Purpose of the Study:

• To investigate the spectrum of cardiac disease in patients with an initial diagnosis of EDMD caused by LMNA gene mutations.

Main Methods:

• Evaluation of 10 consecutive EDMD patients with LMNA mutations.
• Methods included medical interviews, physical examinations, ECG, echocardiograms, 24-h Holter monitoring, and electrophysiological testing/cardiac catheterization when indicated.

Main Results:

• Cardiac disease was identified in 8 out of 10 patients.
• Manifestations included supraventricular and ventricular arrhythmias, atrioventricular conduction disorders, dilated, non-dilated, and restrictive cardiomyopathies.
• Sudden death occurred despite pacemaker implantation.

Conclusions:

• Cardiac disease is prevalent in EDMD patients with LMNA mutations.
• The spectrum of cardiac disease encompasses arrhythmias, conduction abnormalities, cardiomyopathies, and a risk of sudden death.
• These findings highlight the importance of cardiac monitoring in EDMD patients with LMNA mutations.