Cite this article as:
Tessa Davis. Myocarditis, Don't Forget the Bubbles, 2014. Available at:

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.