Noninvasive Programmed Stimulation Predicts Arrhythmia in Ischemic Cardiomyopathy With ICDs for Primary Prevention.

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Implantable cardioverter-defibrillators (ICDs) are crucial for preventing sudden cardiac death in ischemic cardiomyopathy (ICM) patients.
• Noninvasive programmed stimulation (NIPS) is explored as a tool to predict ventricular tachycardia (VT) or ventricular fibrillation (VF) and identify high-arrhythmic-risk patients.

Purpose of the Study:

• To assess the predictive capability of NIPS for VT/VF episodes and mortality in ICM patients post-ICD implantation for primary prevention.

Main Methods:

• Prospective, single-center study involving 50 ICM patients receiving ICD or CRT-D for primary prevention.
• NIPS performed 1-3 months post-implantation, followed by monitoring for VT/VF recurrence and mortality.

Main Results:

• Positive NIPS was found in 20% of patients.
• Over a median of 5.67 years, 16% experienced VT/VF. Positive NIPS significantly increased VT/VF risk (p=0.047) with earlier onset (0.58 vs. 4.75 years).
• NIPS did not predict mortality (p=0.45); however, elevated creatinine and NT-proBNP levels were associated with increased mortality.

Conclusions:

• NIPS positivity effectively predicts a higher risk of VT/VF episodes in ICM patients after primary prevention ICD implantation.
• NIPS is valuable for predicting arrhythmic events but not mortality in this population.
• Elevated creatinine and NT-proBNP levels are significant predictors of patient survival.