Related Experiment Video
Updated: Aug 19, 2026
Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index
Published on: January 8, 2020
Development of a risk score for intramyocardial hemorrhage in elderly STEMI patients after primary PCI: a
Rui Wang1, Cuijun Hao1, Jiaqi Liu2
1Department of Cardiology, The First Affiliated Hospital of Hebei North University, Zhangjiakou, China.
Insights
Intramyocardial hemorrhage (IMH) is common in elderly STEMI patients post-PCI. A new risk score (IMH-RS) effectively predicts IMH risk using factors like renal function and coronary disease, aiding early stratification.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Diagnostic Imaging
Background:
- Intramyocardial hemorrhage (IMH) is a significant complication in ST-segment elevation myocardial infarction (STEMI) patients undergoing primary percutaneous coronary intervention (PCI).
- Predicting IMH is crucial for risk stratification and guiding management in elderly STEMI patients.
Purpose of the Study:
- To identify independent risk factors for IMH in elderly STEMI patients post-primary PCI.
- To develop and validate a clinical risk score (IMH-RS) for predicting IMH in this patient population.
Main Methods:
- Retrospective observational study of 232 elderly STEMI patients undergoing primary PCI.
- Cardiac magnetic resonance (CMR) imaging used to classify patients into IMH and non-IMH groups.
- Multivariate logistic regression analysis to identify independent predictors; development and internal validation of the IMH-RS.
Main Results:
- The incidence of IMH was 33.2%.
- Independent predictors identified: renal insufficiency, left anterior descending artery involvement, door-to-balloon time >45 min, triple-vessel disease, elevated B-type natriuretic peptide, and reduced left ventricular ejection fraction.
- The developed IMH-RS demonstrated good discrimination (AUC=0.82) and effectively stratified patients into low, intermediate, and high-risk groups.
Conclusions:
- IMH is prevalent in elderly STEMI patients after primary PCI and associated with specific clinical and procedural factors.
- The IMH-RS is a novel, practical bedside tool for early risk stratification, integrating multiple risk factors.
- This score can guide targeted management strategies to mitigate microvascular injury in high-risk patients.
Objective:
This study aimed to identify independent risk factors for intramyocardial hemorrhage (IMH) and develop a clinical risk score for predicting IMH in elderly patients with ST-segment elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention (PCI).
Methods:
We conducted a single-center retrospective observational study of 232 consecutive elderly patients (≥60 years) with STEMI who underwent primary PCI between August 2020 and August 2024 and completed cardiac magnetic resonance (CMR) imaging 3-7 days post-procedure. Patients were classified into IMH (n = 77) and non-IMH (n = 155) groups based on CMR findings. Clinical, laboratory, angiographic, and procedural data were collected. Univariate and multivariate logistic regression analyses were performed to identify independent predictors. A risk score (IMH-RS) was developed and validated internally.
Results:
The incidence of IMH was 33.2% (77/232). Multivariate logistic regression identified the following independent predictors: renal insufficiency (OR = 2.95, 95% CI: 1.41-6.18, P = 0.004), left anterior descending artery involvement (OR = 2.01, 95% CI: 1.02-3.97, P = 0.044), door-to-balloon time >45 min (OR = 2.55, 95% CI: 1.36-4.78, P = 0.003), triple-vessel disease (OR = 6.12, 95% CI: 2.51-14.88, P < 0.001), elevated B-type natriuretic peptide (per 100 pg/L increase: OR = 1.25, 95% CI: 1.05-1.49, P = 0.012), and reduced left ventricular ejection fraction (per 1% increase: OR = 0.94, 95% CI: 0.91-0.97, P < 0.001). An integer-based risk score (IMH-RS) ranging from 0 to 10 was developed, demonstrating good discrimination (AUC = 0.82, 95% CI: 0.77-0.87) and effectively stratifying patients into low- (12.5% IMH), intermediate- (38.2%), and high-risk (68.9%) groups (P < 0.001).
Conclusion:
IMH is common in elderly STEMI patients after primary PCI and is independently associated with renal dysfunction, extensive coronary disease, delayed reperfusion, and markers of myocardial injury. The IMH-RS score, derived from a comprehensive integration of patient comorbidities, coronary anatomy, procedural timing, and myocardial injury severity, represents a novel and practical bedside tool for early risk stratification. This integrative approach provides a more holistic risk assessment than individual predictors alone. The score may guide targeted management strategies to mitigate microvascular injury.
