After a physical examination, your doctor might order one or more tests to confirm that you have myocarditis and determine its severity. Tests to diagnose myocarditis might include: Electrocardiogram (ECG or EKG). This quick and painless test shows your heart's electrical patterns and can detect abnormal heartbeats.

How does myocarditis appear on ECG?

The ECG findings most commonly seen in myocarditis are: Sinus tachycardia. Diffuse T wave inversions. ST segment elevation without reciprocal depression.

Can ECG detect heart inflammation?

An ECG can show inflammation, as well as localize the area of the heart that is inflamed. In the setting of heart muscle inflammation, an ECG commonly shows extra beats (extrasystole) and/or an accelerated heartbeat.