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ST abnormalities

ECG changes in Pericarditis

Epomedicine, Mar 5, 2014Jun 12, 2016

Last updated on June 12, 2016

Synonyms: Acute pericarditis, Viral pericarditis, Infectious pericarditis

Definition: Diffuse inflammation of the pericardial lining surrounding the heart and characterized by sharp pleuritic, retrosternal chest pain worsened with recumbency and relieved by leaning forwards.

Causes of Pericarditis:

a. Infectious:

  1. Viral: Coxsackievirus, Echovirus, Ebstein-Barr virus, Influenza, HIV, Mumps virus
  2. Bacterial: Staphylococcus, Hemophilus, Pneumococcus, Salmonella, Tuberculosis, Meningococcus, Syphilis
  3. Miscellaneous: Histoplasmosis, Blastomycosis, Coccidiodomycosis, Aspergillosis, Amebiasis, Rickettsia

b. Rheumatogenic: SLE, Rheumatoid arthritis, Ankylosing spondylitis, Sarcoidosis, Scleroderma, Vasculitis

c. Neoplastic: Secondaries, Sarcomas, Mesothelioma

d. Drugs: Hydralazine, Procainamide

e. Immunologic: Celiac sprue, Inflammatory Bowel Disease

f. Other: Chest trauma, Uremia, Myxedema, Aortic dissection, Radiation therapy, Myocardial infarction, Dressler’s syndrome

g. Idiopathic

Stages of ECG changes in Pericarditis:

ECG stages pericarditis

The duration for evolution through each of the 4 ECG stages is highly variable ranging from hours to weeks. Practically, Stage I is the only diagnostic phase because Stage II looks normal and Stage III mimics ischemia.

Stage ECG changes Electrical basis or Mechanism
I (Everything is up) Diffuse, concave ST elevation Generalized pericardial inflammatory process and associated myocarditis
II (Transition or pseudonormalization) ST segment returns to baseline Resolution of superficial myocarditis
T-wave flattening
PR depression (ST segment appears to be elevated) Generalized epicardial atrial injury
III (Everything is down) T wave inversion Delay in repolarization of whole subepicardial healing epicardium
IV (Normalization) ECG abnormalities normalizesT wave inversions may become permanent Resolution of pericarditis

Since, the secondary myocarditis is usually superficial:

  • Q waves do not form
  • R waves are unaffected
  • QRS is not prolonged
  • QT is not prolonged

Differential diagnoses:

a. Acute Myocardial Infarction (AMI):

ECG features Acute Pericarditis Acute Myocardial Infarction
PR segment depression Common Rare
Q-waves Absent Present
St-segment elevation DiffuseConcave-up LocalizedConvex-up
Reciprocal T-wave changes Absent Often
T-wave inversion After ST normalization Concomittantly

Summary to approach:

A. Evaluate for STEMI

  1. ST depression in leads other than V1 and aVR or
  2. ST Elevation convex upwards or horizontal or
  3. ST Elevation in Lead III more than Lead II

B. Evaluate for Pericarditis (if all 3 ECG criteria above are negative)

  1. PR Segment depression in multiple leads
  2. Clinically search for pericardial rub
ST segment abnormalities
ST segment abnormalities

b. Benign Early Repolarization (BER):

ECG features Acute Pericarditis Benign Early Repolarization
ST elevation Generalized Limited to precordial leads
PR depression Present Absent
T waves Normal amplitude Prominent
ST segment/T wave ratio >0.25 <0.25
J-point elevation with “Fish-hook” appearance in lead V4 Absent Present
Evolution Progressive Stable or non-progressive

c. Others:

  1. Myocarditis
  2. Pulmonary embolism
  3. Pneumothorax
  4. Hyperkalemia
  5. Pneumopericardium
  6. Subepicardial hemorrhage
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PGMEE, MRCS, USMLE, MBBS, MD/MS Cardiovascular systemECG

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Epomedicine. ECG changes in Pericarditis [Internet]. Epomedicine; 2014 Mar 5 [cited 2025 Oct 7]. Available from: https://epomedicine.com/medical-students/ecg-changes-in-pericarditis/.

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