Predictive Score for Identifying Survival and Recurrence Risk Profiles in Patients Undergoing Ventricular Tachycardia Ablation
Key result
Survival tree analysis identifies distinct risk groups predicting ~65% survival for high-risk VT ablation patients.
- n=1,251
Why the study?
The effect of concurrent risk factors for arrhythmia recurrence and mortality following VT ablation had not been assessed, precluding risk estimation in patients with multiple comorbidities.
Can a Survival Tree-based predictive score identify distinct risk profiles for mortality and recurrence in patients undergoing ventricular tachycardia ablation?
Population
1251 patients undergoing VT ablation
Comparison
16 demographic, clinical, and procedure-related variables evaluated via Survival Tree analysis
Design
Derivation and internal validation study using Survival Tree analysis
Authors
Discussion
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Member takes
Implication
May support risk stratification after VT ablation; hypothesis-generating and requires prospective validation before clinical use.
Key Points
- Identify specific risk groups for all-cause mortality and ventricular tachycardia recurrence using survival tree analysis to evaluate concurrent risk factors.
- Evaluated 16 demographic, clinical, and procedure-related variables across 1,251 patients undergoing ventricular tachycardia ablation using a recursive partitioning algorithm.
- Assessed survival and time to recurrence across generated groups using log-rank tests and internally validated the survival trees using random forest analysis.
- Left ventricular ejection fraction, implantable cardioverter defibrillator/cardiac resynchronization therapy, and prior ablation were the top hierarchical predictors for recurrence; ejection fraction, prior ablation, and electrical storm best predicted mortality.
- Risk stratification separated patients into three distinct groups: survival rates were 65.0% (high-risk), 84.0% (medium-risk), and 97.2% (low-risk).
- Freedom from ventricular tachycardia recurrence was 52.1% in the high-risk group, 72.4% in the medium-risk group, and 88.4% in the low-risk group.
Study Design
Type
Cohort (n=1,251)
Structured PICO
Can a Survival Tree-based predictive score identify distinct risk profiles for mortality and recurrence in patients undergoing ventricular tachycardia ablation?
P
Population
1251 patients undergoing ventricular tachycardia (VT) ablation
I
Intervention
Survival Tree (ST) analysis-based predictive score using 16 demographic, clinical, and procedure-related variables
O
Outcome
Mortality and ventricular tachycardia (VT) recurrencehard clinical
A novel Survival Tree-based decisional model effectively stratifies patients undergoing VT ablation into three distinct risk groups for mortality and arrhythmia recurrence based on factors like LVEF, prior ablation, and device presence.
Cite This Study
Vergara et al. (2018) conducted a cohort in Ventricular tachycardia (n=1,251). Survival Tree (ST) analysis risk stratification was evaluated on Mortality and VT recurrence. A Survival Tree analysis identified three distinct risk groups for patients undergoing VT ablation, with survival rates of 65.0%, 84.0%, and 97.2% in the high-, medium-, and low-risk groups.