Which ECG change is most characteristic of an acute myocardial infarction?
ST segment elevation in affected leads
The hallmark ECG feature of acute transmural (STEMI) infarction is ST-segment elevation ≥ 1 mm (2 mm in V2–V3 for men, 1.5 mm for women) in two or more contiguous leads corresponding to the infarct territory, often with reciprocal ST depression in opposite leads.
Shortened PR with normal QRS, flattened P waves and a narrow QRS with normal rhythm are not specific for acute MI.
Hence, ST segment elevation in affected leads.
Similar Questions
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Important Questions from Introduction to Cardiovascular Diseases
Which ECG change is most commonly associated with myocardial ischemia?
A patient presents with chest pain and ST elevation in leads II, III, and aVF. According to the universal definition of MI, which coronary artery is most likely involved, and what is the ECG diagnosis?
Which segment is primarily analyzed to diagnose an ST-elevation myocardial infarction (STEMI)?
What is a typical ECG finding in patients with cerebral infarct?
In the context of CVS monitoring, which finding in myxedema patients could be explained by their ECG pattern?
