Pulmonary Embolism

The classical ECG signs of acute pulmonary embolism are SIQIIITIII, which are mnemonics representing deep S wave in lead I, pathological Q wave in lead III, and inverted T wave in lead III:

Other nonspecific signs include (see ECG above):

    Back to contents Sinus tachycardia and atrial and ventricular ectopic beats.
    Back to contents Right axis deviation.
    Back to contents Right ventricular strain pattern with inverted T waves in right chest leads.
    Back to contents Incomplete or complete right bundle branch block pattern.
    Back to contents Slow R wave progression in chest leads

But all these ECG signs may not be present even in frank pulmonary embolism.

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