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ECG Disease Patterns

Pulmonary Embolism on ECG

March 4th, 2023


Pulmonary embolism can produce a wide variety of ECG changes. 
The most common ECG finding in PE is sinus tachycardia. The S1Q3T3 pattern is a classic finding, however this is uncommon and is only seen in ~12% of cases.
  • ECG Findings in Pulmonary Embolism

  • Sinus tachycardia
  • Atrial fibrillation / flutter
  • Right bundle branch block
  • T wave inversion in right precordial leads
  • Right axis deviation
  • P pulmonale (right atrial dilatation) - prominent P waves in inferior leads 
  • S1Q3T3 pattern - S wave in lead I, Q wave in in lead III, T wave inversion in lead III
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