Proximal vs. Distal LAD Lesions in ST-Elevation Myocardial Infarction: Insights from ECG and Coronary Angiography
Marius Rus1,2, Bianca Maria Negruțiu3, Felicia Liana Andronie-Cioara4
1Department of Medical Disciplines, Faculty of Medicine and Pharmacy, University of Oradea, 410073 Oradea, Romania.
Insights
Twelve-lead electrocardiography (ECG) effectively identifies the left anterior descending (LAD) artery in ST-segment elevation myocardial infarction (STEMI). However, proximal LAD occlusion may not significantly impact long-term outcomes with modern treatments.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Medical Technology
Background:
- Accurate identification of the culprit vessel, specifically the left anterior descending (LAD) artery, is crucial for timely intervention in ST-segment elevation myocardial infarction (STEMI).
- Electrocardiography (ECG) is a primary diagnostic tool, particularly when advanced imaging or prior clinical data are unavailable.
- This study investigates the utility of 12-lead ECG for LAD involvement detection and lesion localization, alongside the prognostic implications of proximal versus distal LAD lesions in contemporary reperfusion therapy.
Purpose of the Study:
- To assess the accuracy of 12-lead ECG in identifying LAD artery involvement in STEMI patients.
- To evaluate the ability of specific ECG patterns to predict proximal LAD occlusions.
- To compare clinical outcomes between proximal and distal LAD occlusions in the context of modern reperfusion strategies.
Main Methods:
- Analysis of data from 382 STEMI patients.
- Correlation of specific ECG findings (ST-segment elevation in aVL and aVR) with coronary angiographic results.
- Assessment of ECG predictive performance for proximal LAD lesions using sensitivity, specificity, and predictive values.
- Comparison of 30-day and 2.5-year clinical outcomes between proximal and distal LAD occlusion groups.
Main Results:
- ST-segment elevation (≥ 0.5 mm) in aVL or aVR, combined with precordial lead elevation (V2-V4), showed good sensitivity and predictive value for proximal LAD occlusion.
- No significant difference in short-term or long-term clinical outcomes was found between patients with proximal and distal LAD occlusions.
- These findings may be attributed to advancements in percutaneous coronary intervention (PCI) and pharmacotherapy.
Conclusions:
- 12-lead ECG remains a valuable tool for identifying the LAD artery and estimating lesion location in STEMI.
- The prognostic impact of proximal LAD occlusion appears diminished in the current era of advanced reperfusion therapy.
- ECG interpretation should be nuanced, guiding acute management without overemphasizing the prognostic significance of lesion location alone.
Abstract:
Background: The identification of the left anterior descending (LAD) artery as the culprit vessel in ST-segment elevation myocardial infarction (STEMI) is critical for rapid decision-making and targeted reperfusion. Electrocardiography (ECG) remains a vital diagnostic tool, especially in cases of no prior clinical or imaging data. This study evaluates the accuracy of 12-lead ECG in identifying LAD involvement and occlusion level, while examining the prognostic significance of proximal versus distal LAD lesions in the era of modern reperfusion techniques. Methods: Data from 382 patients with STEMI were analyzed, focusing on the correlation between specific ECG patterns, particularly ST-segment elevation in aVL and aVR, and coronary angiographic findings. The predictive performance of ECG in localizing proximal LAD lesions was assessed through sensitivity, specificity, and predictive values. Clinical outcomes at 30 days and 2.5 years were compared between patients with proximal and distal LAD occlusions. Results: ST-segment elevation ≥ 0.5 mm in aVL or elevation in aVR, when associated with elevation in at least two contiguous precordial leads (V2-V4), demonstrated good sensitivity and predictive value for proximal LAD occlusion. Contrary to earlier studies, no significant difference in short- or long-term clinical outcomes was observed between proximal and distal LAD occlusion groups, possibly reflecting improvements in percutaneous coronary intervention (PCI) techniques and modern pharmacotherapy. Conclusions: The 12-lead ECG remains a valuable tool for identifying LAD as the culprit artery and approximating lesion location. However, in the era of advanced reperfusion therapy, the prognostic value of proximal LAD occlusion may be less pronounced than previously thought. These findings support a nuanced interpretation of ECG in guiding acute management without overestimating the long-term prognostic weight of lesion location alone.
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