Pericarditis typically shows diffuse, concave ST elevation across multiple territories without reciprocal depression, often with PR depression; left bundle branch block alters baseline QRS/ST morphology enough that standard STEMI criteria do not reliably apply, requiring modified criteria (e.g., Sgarbossa criteria) in the appropriate clinical context; early repolarization shows a stable, often high-take-off ST elevation pattern, typically in younger patients, without the dynamic evolution seen in true infarction.
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