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The most common ECG finding of an acute pulmonary embolism is sinus tachycardia; however, the classic finding is an S wave in lead I, Q wave in lead III and inverted T waves in lead III (S1Q3T3 ...
A large S wave in lead I, a Q wave in lead III and an inverted T wave in lead III together indicate acute right heart strain. This pattern only occurs in about 10% of people with pulmonary ...
However, the QRS complex morphology is not normal, with prominent (although not very wide) Q waves in leads I, aVL, and V4-V6 (^), suggesting a lateral wall MI. There is also a tall R wave in lead ...