Cardiac Recovery During Long-Term Left Ventricular Assist Device Support

Area of Science:

• Cardiology
• Medical Devices
• Regenerative Medicine

Background:

• Left ventricular assist device (LVAD) research programs focusing on cardiac recovery are scarce, making recovery a rare event in multi-center registries.
• Identifying patients suitable for cardiac recovery post-LVAD implantation remains a significant clinical challenge.

Purpose of the Study:

• To evaluate the incidence of cardiac recovery in patients undergoing LVAD implantation with a specific bridge-to-recovery (BTR) strategy.
• To develop and validate a predictive model for cardiac recovery in LVAD recipients.

Main Methods:

• Analysis of LVAD recipients from the Interagency Registry for Mechanically Assisted Circulatory Support (INTERMACS).
• Comparison of cardiac recovery rates between BTR and non-BTR patients.
• Development and external validation of a weighted recovery predictive score (I-CARS) using the Utah Cardiac Recovery (UCAR) program cohort.

Main Results:

• Cardiac recovery occurred in 1.3% of 15,138 INTERMACS patients, with a significantly higher incidence (11.2%) in the BTR group compared to the non-BTR group (1.2%).
• Key independent predictors of recovery included younger age, non-ischemic cardiomyopathy, shorter time since diagnosis, absence of ICD, normal creatinine, and smaller LVEDD.
• The I-CARS score demonstrated high predictive accuracy (c-index: 0.85) and was well-validated in the UCAR cohort (AUC: 0.94).

Conclusions:

• The incidence of cardiac recovery is substantially higher when an a priori bridge-to-recovery strategy is employed.
• The developed I-CARS tool effectively stratifies patients based on their likelihood of achieving cardiac recovery after LVAD implantation.
• Further large-scale studies are necessary to comprehensively evaluate post-explantation outcomes in patients who achieve cardiac recovery.