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Published on: April 10, 2014
Localising culprit artery in inferior STEMI
Ardalon Farhat-Sabet1, Alexandra Smith2, John E Atwood1
1Cardiology Service, Department of Medicine, Walter Reed National Military Medical Center, Bethesda, Maryland, USA.
Insights
Comparing ST elevation in leads II and III on ECG reliably predicts the culprit artery in inferior ST-elevation myocardial infarction (STEMI), guiding timely intervention for better patient outcomes.
Area of Science:
- Cardiology
- Medical Diagnostics
- Emergency Medicine
Background:
- ST-elevation myocardial infarction (STEMI) is a critical cardiac event.
- Inferior STEMI presents diagnostic challenges due to dual artery supply (RCA or LCx).
- Accurate culprit artery identification is crucial for timely intervention.
Purpose of the Study:
- To evaluate the diagnostic accuracy of ECG criteria for predicting the culprit artery in inferior STEMI.
- To compare ST elevation in leads II and III for localization of the occluded coronary artery.
Main Methods:
- Retrospective cohort analysis of 105 inferior STEMI patients (2008-2020).
- Analysis of 12-lead ECGs for ST elevation quantification in leads II and III.
- Correlation of ECG findings with culprit lesions identified during angiography.
Main Results:
- ST elevation in lead III > lead II showed high specificity (94%) for predicting RCA culprit lesions.
- ST elevation in lead II > lead III demonstrated high specificity (94%) for predicting LCx culprit lesions.
- Predictive values varied, with positive predictive values of 85% for RCA and 55% for LCx.
Conclusions:
- Comparison of ST elevation in leads II and III on ECG is a reliable method for predicting the culprit artery in inferior STEMI.
- This ECG-based prediction can effectively guide coronary intervention strategies.
- Improved localization aids in faster and more targeted treatment of inferior STEMI.
Background:
ST elevation myocardial infarction (STEMI) represents a cardiac emergency. Time to diagnosis, identification of culprit lesion, and intervention are important. Inferior STEMI represents a dilemma for cardiologists. The territory can be supplied by the right coronary artery (RCA) or the left circumflex coronary artery (LCx). Diagnostic algorithms have been proposed to predict the culprit artery.
Methods:
We performed a single-centre retrospective cohort analysis of all patients admitted to our hospital from 2008 to 2020 with a diagnosis of inferior STEMI. We examined the diagnostic 12 lead ECG for quantification of ST elevation in leads II and III and compared this to culprit lesion found on angiography.
Results:
There were 304 patients identified with STEMI in our database; 105 were found to have an inferior myocardial infarction by ECG criteria. Ninety-nine were included in our study with either RCA or LCx culprit lesions on angiography (82 males, 17 females). The average age of these patients was 64.9 years old. Sensitivity, specificity, positive predictive value and negative predictive value for ST elevation in lead II exceeding lead III predicting LCx culprit lesion was 0.32 (95% CI 0.13 to 0.57), 0.94 (95% CI 0.86 to 0.98), 0.55 (95% CI 0.29 to 0.78), 0.85 (95% CI 0.81 to 0.89), respectively. Sensitivity, specificity, positive predictive value and negative predictive value for ST elevation in lead III exceeding lead II predicting RCA culprit lesion was 0.94 (95% CI 0.86 to 0.98), 0.32 (95% CI 0.13 to 0.57), 0.85 (95% CI 0.81 to 0.89), 0.55 (95% CI 0.29 to 0.78), respectively.
Conclusions:
In inferior STEMI, comparison of ST elevation in leads II and III can reliably predict culprit lesion artery and guide intervention.
Subject Indexing:
Culprit artery localisation, inferior stemi, ECG.
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