Arrhythmias in dilated cardiomyopathy.

Area of Science:

• Cardiology
• Electrophysiology
• Heart Failure Research

Background:

• Dilated cardiomyopathy (DCM) is a significant cause of heart failure.
• Ventricular arrhythmias are a known complication of DCM.
• The prognostic implications of complex ventricular arrhythmias in DCM require further elucidation.

Purpose of the Study:

• To assess the prevalence of ventricular arrhythmias in patients with DCM.
• To investigate the correlation between complex ventricular arrhythmias and hemodynamic indices of ventricular dysfunction.
• To evaluate the prognostic significance of complex ventricular arrhythmias in DCM patients.

Main Methods:

• 24-hour electrocardiographic monitoring in 65 DCM patients.
• Assessment of hemodynamic indices including ejection fraction and cardiac index.
• Follow-up for mortality over a mean period of 30 months.

Main Results:

• 95.4% of patients exhibited ventricular arrhythmias; 80% had complex forms (multiform/paired extrasystoles, ventricular tachycardia).
• Complex ventricular arrhythmias were associated with significantly lower ejection fraction (31.9% vs. 41.1%) and cardiac index (2.9 vs. 3.5 L/min/m²).
• Mortality was higher in patients with complex ventricular arrhythmias during follow-up.

Conclusions:

• Complex ventricular arrhythmias are highly prevalent in DCM and linked to impaired ventricular function.
• The presence of ventricular tachycardia and complex extrasystoles suggests a poorer prognosis in DCM.
• The role of antiarrhythmic therapy in managing these arrhythmias and improving outcomes in DCM remains to be determined.