A novel risk model for predicting potentially life-threatening arrhythmias in non-ischemic dilated cardiomyopathy...

Area of Science:

• Cardiology
• Clinical Risk Stratification
• Electrophysiology

Background:

• Non-ischemic dilated cardiomyopathy (DCM) poses a risk of sustained ventricular arrhythmias (SVA) and sudden cardiac death (SCD).
• Current guidelines rely on left-ventricular ejection fraction (LV-EF) for prophylactic implantable cardioverter-defibrillator (ICD) implantation, which may lead to overtreatment or missed diagnoses.
• Individualized risk stratification is needed for DCM patients.

Purpose of the Study:

• To develop and validate a clinical risk calculator for individualized risk stratification of DCM patients.
• To improve decision-making for primary prophylactic ICD implantation in non-ischemic DCM.
• To reduce overtreatment and ensure appropriate patient selection for ICDs.

Main Methods:

• A multi-center European study (DETECTIN-HF) included 1393 DCM patients.
• A Cox proportional hazards model was developed and internally validated using cross-validation.
• The model incorporated seven clinical parameters: sex, history of non-sustained ventricular tachycardia, syncope, family history of cardiomyopathy, QRS duration, LV-EF, and atrial fibrillation history. Late gadolinium enhancement (LGE) was an optional eighth parameter.

Main Results:

• During a mean follow-up of 57.0 months, 13.8% of patients experienced an arrhythmic event.
• The model demonstrated good calibration (slope 0.97) and discrimination (C-index 0.72).
• The model identified patients for ICD implantation, achieving similar protection as current guidelines but with 15% fewer implantations.

Conclusions:

• The developed DCM-SVA risk model effectively stratifies risk using accessible clinical data.
• This tool can enhance decision-making for primary SCD prevention in non-ischemic DCM.
• The model is expected to reduce overtreatment with ICDs in this patient population.