A 60-year-old male was admitted for a 2-day history of newly documented repeated severe chest pain lasting 10–15 min.

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There exist four stages of pericarditis :
Stage 1 – diffuse concave ST elevation and PR depression in all leads (reciprocal ST depression and PR elevation in aVR),  
Stage 2 – normalisation of ST changes; generalised T wave flattening (1 to 3 weeks),  
Stage 3 – flattened T waves become inverted (3 to several weeks) and
Stage 4 – ECG returns to normal or persistence of T-wave inversions (several weeks onwards). Spodick’s

How can you differentiate between Pericarditis and STEMI:  
1) STE in pericarditis are concave; in AMI - convex or horizontal,  
2) STE in pericarditis - diffuse; in AMI - localised,  
3) Pericarditis - PR depression; AMI - Q waves,  
4) Pericarditis - inversion of T waves appear after normalising of ST segment; AMI - T wave inversion appears with STE ECG manifestation.
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