Source: www.aafp.org
Acute Pericarditis Electrocardiographic Changes

Stage l: Diffuse, concave ST-segment elevation 

Stage II: ST segments normalize, J point returns to baseline, T-wave amplitude begins to decrease, PR-segment depression begins to appear 

Stage Ill: Symmetric, diffuse T-wave inversions 

Stage IV: Changes normalize or T-wave inversions may become permanent 

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