Which set of laboratory results is indicative of a patient who has suffered an acute myocardial infarction?

The correct set of laboratory results indicative of a patient who has suffered an acute myocardial infarction is characterized by elevated levels of total creatine kinase (CK), CK-MB fraction, and a CK-MB index that suggests myocardial damage.

In this context, a total CK value of 170 U/L is elevated, particularly when paired with a CK-MB level of 14 µg/L. A CK index of 8.2% indicates a significant proportion of the CK is from the myocardial cells, supporting the diagnosis of an acute myocardial infarction. Typically, a CK-MB index above 6% can suggest myocardial injury.

The combination of these values reflects a greater likelihood of heart muscle damage as seen in an acute myocardial infarction compared to the other options, which present lower CK and CK-MB values. Lower values, such as those seen in the other options, are generally not sufficient to indicate myocardial infarction, and especially in the case of significantly lower CK values, they are more likely to indicate normal or non-acute conditions. Hence, option B correctly portrays the characteristic laboratory findings associated with an acute myocardial infarction.