Stage I (with PR segment abnormalities):

Look for widespread ST segment elevation with concomittant PR depression in the same leads. The PR segment in aVR sticks above the baseline like a knuckle, reflecting atrial injury.

Differentiating pericarditis from early repolarization:

Only lead V6 is used. If A/B > 25%, suspect pericarditis. If A/B < 25%, suspect early repolarization.

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