ECG findings of rheumatic or viral myocarditis are relatively non‐specific and may include:
- AV conduction disturbances, ranging from PR prolongation to complete AV dissociation.
- Low QRS voltages (5 mm or less in all limb leads).
- Decreased T wave amplitude.
- QT prolongation.
- Tachyarrythmias including SVT and VT.
- ‘Pseudoinfarction’ pattern with deep Q waves and poor R wave progression in precordial leads.
Note: prolonged PR interval is a minor Jones criteria for acute rheumatic fever.