Pulmonary embolism causes ECG signs of acute pulmonary hypertension or right ventricular strain. It most commonly causes a sinus tachycardia. Other changes include RBBB (complete or incomplete), right axis deviation, R in V1, right atrial enlargement, S1Q3T3, clockwise rotation, atrial arrhythmias and nonspecific ST-T changes.
See also: Pulmonary and Pericardial
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- Hampton J, Hampton J. The ECG Made Easy. 9th edition. Elsevier
An elderly woman transferred to you for chest pain, shortness of breath, and positive troponin – does she need the cath lab now?
RBBB. Is there ST Elevation in III and aVR, with reciprocal ST depression in I and aVL?