A 52-year-old patient presents to the emergency department with reports of substernal chest pain.A history is taken; serum creatine kinase (CK)and lactate dehydrogenase (LDH)isoenzymes and serum lipid studies are ordered, as is a 12-lead ECG.Which of the following results is most significant in diagnosing an MI during the first 12 hours of chest pain?

Question

Quizplus · Accepted Answer

The creatine kinase (CK)muscle/brain (MB)biomarker (CK-MB)is released as a result of myocardial damage, and serum levels rise 4 to 8 hours after myocardial infarction (MI), peak at 15 to 24 hours, and remain elevated for 2 to 3 days.Serial samples are drawn routinely at 6- or 8-hour intervals, and three samples are usually sufficient to support or rule out the diagnosis of MI.

A 52-Year-Old Patient Presents to the Emergency Department with Reports