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A Silent Killer: Left Main Coronary Artery Disease in Gastrointestinal Bleed
Hesham Afify1, Volodymyr Oliynyk2, Floyd Burke3,4
1Internal medicine, University of Central Florida/HCA Healthcare Graduate Medical Education, Orlando, USA.
Insights
Left main coronary artery disease (LMCAD) prediction is crucial for patient outcomes. Specific ECG patterns, like ST elevation in lead aVR, can indicate LMCAD but require careful interpretation to distinguish from other serious conditions.
Area of Science:
- Cardiology
- Diagnostic Electrocardiography
Background:
- Left main coronary artery disease (LMCAD) affects nearly 5% of patients undergoing angiography and poses a high risk of cardiovascular events.
- Accurate prediction of LMCAD is vital for selecting appropriate treatment strategies.
Observation:
- Typical electrocardiogram (ECG) findings suggestive of LMCAD include ST elevation in lead aVR (aVR-STE) greater than 0.5 mV, often with ST depression in other leads.
- ST elevation in aVR (aVR-STE) is linked to poorer outcomes, necessitating vigilant monitoring.
Findings:
- While aVR-STE can indicate LMCAD, it is not exclusively diagnostic of acute left main coronary artery occlusion (LMCA).
- aVR-STE can also be associated with severe triple-vessel disease or diffuse subendocardial ischemia.
Implications:
- Distinguishing LMCAD from other conditions presenting with aVR-STE is critical for timely and effective intervention.
- Further evaluation is warranted for patients with aVR-STE to determine the underlying cause and guide management.
Abstract:
Left main coronary artery disease (LMCAD) is defined as more than 50% angiographic arterial narrowing and has been demonstrated in nearly 5% of all patients undergoing coronary angiography. It carries an extremely high risk for cardiovascular morbidity and mortality as it impacts more than two-thirds of the left ventricle. Prediction of LMCAD in the right clinical setting is important for the selection of the proper treatment strategies. Typical ECG characteristics are ST elevation (STE) in lead augmented vector right (aVR-STE) of more than 0.5 mV accompanied by ST depression (STD) notably in leads I, II, and V4-6 or STE in aVR ≥ V1. Furthermore, the presence of aVR-STE is associated with worse outcomes and careful evaluation and close monitoring are warranted. However, not every aVR-STE is an acute occlusion of the left main coronary artery (LMCA), as acute occlusion is a catastrophic event. aVR-STE can also be associated with severe triple-vessel disease or diffuse subendocardial ischemia.
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