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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