Which of the following is the most common ECG finding of pulmonary embolism?
(A) a deep S wave in lead I
(B) depressed ST segments in leads I and II
(C) prominent Q wave in lead I, and inversion of T wave in lead III
(D) sinus tachycardia
(E) clockwise rotation in the precordial leads
Answer: (D) sinus tachycardia
Discussion: Sinus tachycardia is the most common ECG finding in pulmonary embolism.
The specific ECG signs of pulmonary embolism such as the S1, Q3, T3 are rarely seen except in cases of massive pulmonary embolism.
In submassive pulmonary emboli, the ECG may show nonspecific ST changes and sinus tachycardia.
On occasion, pulmonary embolism can precipitate atrial flutter or fibrillation.
One of the most useful roles of the ECG is to rule out MI when a massive embolism is present.
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