Implantable cardioverter-defibrillator elective generator replacement: a procedure for all?

Area of Science:

• Cardiology
• Medical Devices
• Prognostics

Background:

• Implantable cardioverter-defibrillators (ICDs) are crucial for managing life-threatening arrhythmias.
• Estimating mortality risk in patients undergoing elective ICD generator replacement (GR) is essential for treatment decisions.
• Several risk stratification scores exist, but their utility in the specific context of ICD GR needs validation.

Purpose of the Study:

• To validate and compare six existing risk stratification scores for predicting mortality in patients undergoing elective ICD GR.
• To assess the overall outcomes, including all-cause mortality and appropriate ICD therapies, following ICD GR.

Main Methods:

• A cohort of 223 patients with dilated cardiomyopathy undergoing elective ICD GR was retrospectively analyzed.
• Six pre-existing risk scores were evaluated for their ability to predict post-discharge all-cause mortality.
• Statistical methods included receiver-operating characteristic (ROC) curves and integrated discrimination improvement (IDI) index for score comparison.

Main Results:

• The Bilchick score demonstrated the highest prognostic utility for predicting all-cause mortality (AUC = 0.813 ± 0.038, p < 0.001).
• The Bilchick score outperformed other scores in risk reclassification (IDI and relative IDI).
• Predictors of post-GR ICD therapy included pre-GR appropriate ICD therapy, male gender, and atrial fibrillation history.

Conclusions:

• Existing risk scores, particularly the Bilchick score, are valuable tools for predicting mortality risk in patients undergoing ICD GR.
• These scores can help identify patients unlikely to benefit from continued ICD therapy due to high inherent mortality risk.
• Risk stratification aids in personalized treatment strategies for patients with implantable cardioverter-defibrillators.