What is a classic ECG finding in pericarditis?

In cases of pericarditis, a classic finding on the ECG is low-voltage, diffuse ST-segment elevation. This is due to the inflammation of the pericardial sac, which often leads to a distinct pattern of ST-segment elevations that occur integrally across multiple leads rather than being localized to one specific region.

The ST-segment elevation seen in pericarditis is typically concave in shape and is accompanied by PR-segment depression, which can further aid in distinguishing it from other conditions like myocardial infarction, where the ST elevations are more localized and often associated with reciprocal changes. The presence of low voltage in the QRS complexes can also indicate the fluid accumulation seen in more advanced cases or associated effusions.

This characteristic ECG finding helps clinicians identify pericarditis and differentiate it from other cardiac issues, making it a highly relevant point in both diagnosis and management of the condition.