Would pericarditis show on ekg?

Ecg: The ECG findings associated with pericarditis are diffuse st segment elevation in all the leads. It is a usual but not universal finding when pericarditis is present.

Possible : St elevations in multiple leads is suggestive but some have it without dramatic findings on ekg.

Usually, not always: There are usually ekg findings in pericarditis, which generally vary over time: 1- initially, there may be diffuse st segment elevation, often with pr segment depression & sometimes with diffuse low voltages 2- days later the st segments may normalize & t wave flattening appears 3- ~2 weeks later, you may see t wave inversion in the inferior & lateral leads 4- weeks later the t waves normalize.

Sometimes: It may sometimes show on ECG depending on how severe.