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July 10, 2026Kardiologia PolskaOpen Access

Predicting 3-year mortality after myocardial infarction in a structured care program: A comparative analysis of Cox regression and machine learning models

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Why the study?

Do machine learning models improve the prediction of 3-year all-cause mortality compared to Cox regression in patients after myocardial infarction?

Population

965 patients enrolled in a structured post-myocardial infarction care program between 2018 and 2022, with…

Comparison

Machine learning models using baseline clinical… vs Cox proportional hazards regression model

Design

Cohort

Follow-up

3 years

Key result

Machine learning models did not outperform Cox regression in predicting 3-year all-cause mortality after myocardial infarction (AUC 0.712-0.738 vs 0.742; P=0.59).

Authors

CSCyntia Szymańska-ŁyczkowskaRDR DankowskiJFJulita Fedorowicz

Discussion

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Member takes

Overview

ML models offer no advantage over Cox regression for post-MI mortality prediction in moderate cohorts; leaves open utility with larger datasets or richer predictors.

Key Points

  • The study aims to compare Cox regression and machine learning models for predicting 3-year mortality after myocardial infarction.
  • Retrospective cohort study of 965 patients in a structured post-MI care program with 3-year follow-up.
  • Development cohort (n=740) and validation cohort (n=225) created to analyze model performance.
  • Cox regression and three ML models (Random Forest, XGBoost, Random Survival Forest) were developed using clinical variables.
  • 13% of patients died during the follow-up period (n=126).
  • Cox model showed an AUC of 0.742, while Random Survival Forest was 0.738, Random Forest 0.727, and XGBoost 0.712 (P=0.59).
  • Random Survival Forest achieved the lowest Brier score of 0.105, but no ML model outperformed Cox regression.

Study Design

Type

Cohort (n=965)

Structured PICO

Do machine learning models improve the prediction of 3-year all-cause mortality compared to Cox regression in patients after myocardial infarction?

P
Population
965 patients enrolled in a structured post-myocardial infarction care program between 2018 and 2022, followed for 3 years.
E
Exposure
Machine learning models (Random Forest, XGBoost, and Random Survival Forest) using baseline clinical variables
C
Comparator
Cox proportional hazards regression model
O
Outcome
3-year all-cause mortalityhard clinical

Main Result

p-value: p=0.59

Machine learning models did not outperform traditional Cox proportional hazards regression for predicting 3-year mortality in a moderate-sized post-MI cohort.

Limitations

  • Moderate-sized real-world cohort with limited predictors
  • Requires external validation in independent cohorts before clinical implementation

Cite This Study

Szymańska-Łyczkowska et al. (2026) conducted a cohort in myocardial infarction (n=965). Machine learning models vs. Cox proportional hazards regression was evaluated on 3-year all-cause mortality (p=0.59). Machine learning models did not outperform Cox regression in predicting 3-year all-cause mortality after myocardial infarction (AUC 0.712-0.738 vs 0.742; P=0.59).

synapsesocial.com/papers/6a508ea56eeac72a437a1731https://doi.org/10.33963/v.phj.113620
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