Cite four clinical signs that suggest that acute myocardial infarction has occurred in the left ventricle and not in the right ventricle. Which single laboratory test provides the clearest evidence...

Cite four clinical signs that suggest that acute myocardial infarction has occurred in the left ventricle and not in the right ventricle.

Which single laboratory test provides the clearest evidence that the patient has suffered acute myocardial infarction?