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[Comparison of the changes in the QRS complex of the ECG with data from a pathologicoanatomic study in acute
Insights
Electrocardiography (ECG) can indicate myocardial infarction (MI) location and size. However, accurately estimating necrosis depth and correlating ECG findings with infarct volume remains challenging in macrofocal MI.
Area of Science:
- Cardiology
- Medical Imaging
- Clinical Electrophysiology
Background:
- Acute myocardial infarction (MI) involves myocardial necrosis, impacting cardiac function.
- Electrocardiography (ECG) is a primary tool for diagnosing and assessing MI.
- Understanding the relationship between ECG changes and infarct characteristics is crucial for patient management.
Purpose of the Study:
- To compare electrocardiographic (ECG) and anatomic data in patients with acute myocardial infarction (MI).
- To investigate QRS-complex changes in macrofocal MI.
- To establish the correlation between ECG data and the volume of infarcted myocardium.
Main Methods:
- Retrospective analysis of 74 patients diagnosed with acute myocardial infarction.
- Comparison of electrocardiographic (ECG) findings with anatomic data derived from myocardial infarction assessment.
- Evaluation of QRS-complex morphology, duration, and amplitude in relation to infarct characteristics.
Main Results:
- Subendocardial and transmural anterior wall necrosis consistently showed QS on ECG.
- Transmural posterior wall necrosis correlated with QR, Qr, or qR patterns in 86% of cases.
- Increased infarct area correlated with prolonged Q wave duration, increased Q/R ratio, and decreased R wave amplitude, but no significant linear correlation was found with Q wave amplitude or the number of leads showing infarction.
Conclusions:
- Estimating the depth of myocardial necrosis using ECG data alone presents significant difficulties.
- While infarct size correlates with specific ECG parameters (Q wave duration, Q/R ratio, R wave amplitude), precise volume correlation remains elusive.
- ECG provides valuable insights into MI location but has limitations in quantifying necrosis depth and exact infarct volume.
Abstract:
A comparison of electrocardiographic and anatomic data was made in 74 patients with acute myocardial infarction with the purpose of investigating QRS-complex changes in macrofocal myocardial infarction, and establishing the correlation between ECG data and the volume of the infarcted myocardium. It has been shown that subendocardial and transmural necrosis of the anterior wall of the left ventricle was in all cases reflected on ECG by QS, while transmural necrosis of the posterior wall was associated in 86% of the cases with the presence of QR, Qr or qR on ECG. Thus, the estimation of myocardial necrosis depth by ECG data is difficult. An increase in myocardial necrosis area is paralleled by an increase in Q wave duration, in Q/R ratio value, and by a decrease in R wave amplitude. There was no significant linear correlation between the volume of necrosis area and the amplitude of Q wave of the number of ECG leads in which signs of myocardial infarction were detected.