What EKG changes are most commonly seen in pericarditis?

In pericarditis, the most characteristic electrocardiogram (EKG) changes are ST segment elevations in multiple leads, often accompanied by a depression of the PR segment. The ST elevation is typically concave and can be seen in many leads, reflecting the inflammation of the pericardium. This widespread ST elevation distinctively differentiates pericarditis from other conditions like myocardial infarction, which typically shows ST elevation in specific leads related to the affected myocardial territory.

The depression of the PR segment seen in pericarditis is due to the inflammation involving the pericardium and potentially affecting the atria, leading to changes in atrial conductance. This combination of findings is a classic presentation in the setting of acute pericarditis and helps clinicians in making an accurate diagnosis.

Other options, such as ST depression or the appearance of Q waves, are not typical for pericarditis and would suggest different pathologies. Normal sinus rhythm can be present in many cardiac conditions, but it does not provide the specific diagnostic information that the characteristic ST elevation and PR segment depression offer in this context. Understanding these specific EKG changes is crucial for the diagnosis and management of patients with pericarditis.