During acute myocardial infarction which of the following changes occurs in the ECG ?

Flattened T wave

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Depressed ST segment

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Elevated ST segment

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Increased length of PR interval

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Solution

The correct option is B Elevated ST segment
A) T wave is never flat. It is either positive, negative or biphasic.
B) Depressed ST segment indicates ischemia. Ischemia is the inadequate blood supply to an organ or part of the body, especially the heart muscles
C) In a myocardial infarction at first, large peaked T waves are observed, followed by ST elevation.
D) An increase in the length of PR interval indicates a first-degree heart block.
So the correct answer is 'Elevated ST segment'.

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