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[Relation between electrocardiography and coronary angiography findings in the infarct stage]
Insights
Electrocardiograms reliably identify the infarct-related artery in acute myocardial infarction. Specific ECG patterns correlate with Left Anterior Descending (LAD) or Right Coronary Artery (RCA) blockages, aiding diagnosis.
Area of Science:
- Cardiology
- Diagnostic Imaging
Context:
- Acute myocardial infarction (AMI) diagnosis requires timely identification of the occluded coronary artery.
- Early electrocardiography (ECG) is crucial for guiding treatment decisions in AMI.
Purpose:
- To correlate electrocardiographic abnormalities with the infarct-related artery identified by coronary arteriography in patients with AMI.
- To assess the reliability of early ECG findings in localizing coronary artery occlusions.
Summary:
- 152 AMI patients had ECGs and coronary arteriography. ST elevation correlated with Left Anterior Descending (LAD) or Right Coronary Artery (RCA) occlusions.
- ST depression suggested Left Circumflex (CX) artery involvement. Specific ECG patterns predicted anterior, inferior, or posterior wall MI related to LAD, RCA, or CX arteries.
- ECG reliably localized LAD occlusions, even with subtotal blockages, and identified non-classical patterns in 56% of CX artery occlusions.
Impact:
- Early ECG interpretation aids in pinpointing the specific coronary artery responsible for AMI.
- This correlation can optimize reperfusion strategies and improve patient outcomes.
- The study validates the use of standard ECG for early localization of infarct-related arteries in AMI.
Abstract:
One hundred and fifty-two patients underwent cardiac catheterization and coronary arteriography within 6.3 +/- 6.0 hours from onset of acute myocardial infarction. All had a standard 12-lead electrocardiogram recorded within 1.5 hours of cardiac catheterization. The electrocardiographic abnormalities present were correlated with the infarct related artery as determined by coronary arteriography. ST segment elevation was the most common finding in patients with the left anterior descending (LAD), or right coronary artery (RCA) as the infarct related artery. ST segment depression was the most common abnormality in patients with left circumflex artery (CX) as the infarct related artery. A typical pattern of anterior acute myocardial infarction was seen in 93% of all patients with the LAD as the infarct related artery. A typical pattern of acute inferior myocardial infarction was seen in 53% of all patients with RCA or CX narrowing taken as one group. The pattern of true posterior or posterolateral wall acute myocardial infarction in the absence of typical changes in the inferior leads was highly specific and predictive of CX narrowing. In contrast, the pattern of an inferior wall myocardial infarction, in the absence of true posterior or lateral wall changes, was highly specific and predictive of right coronary artery narrowing. Fifty-six percent of patients with CX artery as the infarct related artery presented with non-classical electrocardiographic abnormalities. The electrocardiographic pattern in patients with subtotal occlusions were similar to those of patients with total occlusions. Thus the electrocardiogram obtained in the first few hours of acute myocardial infarction is reliable in localizing the LAD as the infarct related artery.(ABSTRACT TRUNCATED AT 250 WORDS)