Baseline cardiac power output >0.60 W predicts rapid walking recovery to 5,500 ft by day 20, while ≤0.60 W indicates gradual improvement to 3,800 ft by day 50 during Impella 5.5 prehabilitation.
Does baseline cardiac power output predict functional recovery trajectories in cardiogenic shock patients undergoing Impella 5.5 prehabilitation for heart transplant?
Baseline cardiac power output effectively stratifies functional recovery trajectories in cardiogenic shock patients on Impella 5.5 support, enabling individualized prehabilitation strategies prior to heart transplant.
Absolute Event Rate: 0% vs 0%
Introduction: Impella 5.5 enables ambulatory mechanical circulatory support for heart transplant candidates, but predictors of successful prehabilitation are poorly understood. Cardiac power output (CPO), the hydraulic work of the heart, is a powerful indicator in cardiogenic shock. We hypothesized that baseline CPO would predict individualized functional recovery phenotypes during Impella 5.5-supported prehabilitation in heart transplant candidates. Methods: We conducted a retrospective cohort study of 82 cardiogenic shock patients supported with Impella 5.5 for heart transplant listing from April 2022 to September 2024. CPO was calculated as (mean arterial pressure × cardiac output)/451 and dichotomized at 0.60 W based on established prognostic thresholds. Daily walking distance was monitored during support duration. Longitudinal trajectories were analyzed using linear mixed-effects models with restricted cubic splines to allow for non-linear recovery patterns. Results: Mean age was 54.9±13.1 years with 83% male patients. Early rapid recovery from 600-700 feet to 5,000-5,500 feet by day 20, followed by plateau was shown by high CPO patients (>0.60 W, n=47). Progressive, persistent improvement from 1,300-1,500 feet to 3,700-3,800 feet by day 45-50 without plateau was shown by low CPO patients (≤0.60 W, n=35). Mixed-effects models confirmed significant non-linear trajectories in both CPO strata (p< 0.001). High CPO patients achieved superior peak functional capacity but plateaued early, while low CPO patients demonstrated sustained adaptive capacity over time. Conclusions: Baseline cardiac power output effectively stratifies heart transplant candidates into distinct functional recovery phenotypes during Impella 5.5 prehabilitation. High CPO predicts rapid early improvement followed by plateau, while low CPO indicates continued gradual improvement. These findings enable individualized prehabilitation approaches and can help optimize resource allocation in patients awaiting heart transplant with temporary mechanical circulatory support.
Patel et al. (Sun,) reported a other. Baseline cardiac power output >0.60 W predicts rapid walking recovery to 5,500 ft by day 20, while ≤0.60 W indicates gradual improvement to 3,800 ft by day 50 during Impella 5.5 prehabilitation.
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