Source: litfl.com
ECG changes in Pulmonary Embolism
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Sinus tachycardia 
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Complete or incomplete RBBB 
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Right ventricular strain pattern
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Right axis deviation
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Dominant R wave in V1 
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Right atrial enlargement (P pulmonale)
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SI QIII TIII  pattern
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Clockwise rotation
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Atrial tachyarrhythmias
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Non-specific ST segment and T wave changes, including ST elevation and depression.
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