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Why the sudden shock after a few days of malaise?

Dr. Smith's ECG Blog

This is a value typical for a large subacute MI, n ormal value 48 hours after myocardial infarction is associated with Post-Infarction Regional Pericarditis ( PIRP ). As already mentioned, this patient could have post-infarction regional pericarditis from a large completed MI. Hammill SC. Edwards WD.

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Chest pain followed by 6 days of increasing dyspnea -- what happened?

Dr. Smith's ECG Blog

The exception is with postinfarction pericarditis , in which a completed transmural infarct results in inflammation of the subepicardial myocardium and STE in the distribution of the infarct, and which results in increased STE and large upright T-waves. These findings together are more commonly seen with pericarditis.