Which ECG finding most reliably indicates myocardial ischemia rather than established myocardial infarction?
Reversible ST segment deviation without pathological Q waves
Reversible ST-segment deviation without pathological Q waves (typically ST depression or transient elevation that resolves with rest or nitrates) reflects demand ischaemia without completed infarction — i.e. myocardial ischaemia only.
Fixed deep T-wave inversion over days, deep Q waves in contiguous leads, and persistent ST elevation with loss of R waves are all markers of established myocardial infarction, so they do not distinguish ischaemia from infarction.
Hence, Reversible ST segment deviation without pathological Q waves.
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 ECG change is most characteristic of an acute myocardial infarction?
Which segment is primarily analyzed to diagnose an ST-elevation myocardial infarction (STEMI)?
What is a typical ECG finding in patients with cerebral infarct?
