Abstract
Introduction: Acute ST - segment elevation myocardial infarction is one of the acute coronary syndrome, posing an increased risk of mortality and incidence of cardiac events despite significant advances in treatment modalities. Early risk stratification in patients with acute ST - segment elevation myocardial infarction is essential for optimizing treatment. The QRS - T angle in the frontal plane of the surface electrocardiogram is one of the signs that has been and is being proven to have a role in assessing and predicting the severity of patients with acute ST-segment myocardial infarction.
Objectives: 1: To investigate the QRS - T angle on surface electrocardiography in patients with acute ST segment elevation myocardial infarction. 2: To explore the relationship and correlation between the QRS - T angle on surface electrocardiography with serum high-sensitive Troponin T levels, left ventricle ejection fraction, Killip classification, and arrhythmia status in patients with acute ST-segment elevation myocardial infarction.
Subjects and methods: A cross-sectional descriptive study was conducted on 109 patients diagnosed with acute ST-segment elevation myocardial infarction at the Emergency Department of Cardiology and Intervention, Hue Central Hospital, from February
6, 2023, to January 15, 2024. Results: The mean age of the study population was 65.76 ± 11.5 years, with 56.9% of patients aged ≥ 65 years and 67.0% being male. The optimal cut-off value of the f(QRS - T) angle in our study was 84.500, which had a prognostic value in patients with ST-elevation acute myocardial infarction with a sensitivity of 80.0% and a specificity of 63.5% with an area under the curve of 0.78. The mean value of the f(QRS - T) angle was statistically significantly higher in the group with Killip classification II - IV, intermediate to high TIMI - STEMI risk stratification, reduced left ventricle ejection fraction, and arrhythmia status compared to equivalent subgroups. We observed an inverse correlation between the f(QRS - T) angle and left ventricle ejection fraction (LVEF) with r = - 0.36 and p < 0.001. There was a relationship and correlation between the f(QRS - T) angle and left ventricle ejection fraction, Killip classification, and arrhythmia status.
Conclusion: The optimal cut-off value of the f(QRS - T) angle is 84.500, which defines the boundary value of the f(QRS - T) angle for predicting severity in patients with acute ST-segment elevation myocardial infarction. There is a relationship and correlation between the f(QRS - T) angle and left ventricle ejection fraction, arrhythmia status, Killip classification, and TIMI risk stratification for patients with ST-segment myocardial infarction.
| Published | 2025-06-25 | |
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| Issue | Vol. 15 No. 3 (2025) | |
| Section | Original Articles | |
| DOI | 10.34071/jmp.2025.3.2 | |
| Keywords | Nhồi máu cơ tim cấp có ST chênh lên, góc f(QRS - T), phân tầng nguy cơ, mức độ nặng Acute ST-segment elevation myocardial infarction, f(QRS - T) angle, risk stratification, severity |
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Copyright (c) 2025 Hue Journal of Medicine and Pharmacy
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