Which blood test is used to detect muscle injury after a myocardial infarction according to the material?

• A. Creatine Kinase
• B. Troponin
• C. Amylase
• D. Glucose

Answer: (A)

The concept here is that enzymes released from damaged muscle tissue enter the bloodstream, so measuring that enzyme can indicate muscle injury. Creatine kinase is one of those enzymes and is released when heart muscle is damaged during a myocardial infarction. This makes CK a signal that muscle tissue, including cardiac muscle, has been injured. The other options don’t reflect muscle injury: amylase is linked to pancreatic or salivary glands, glucose is a metabolic marker, and while troponin is a very specific indicator of heart muscle injury, the material in question identifies creatine kinase as the marker for muscle injury after MI. CK typically rises after injury and helps confirm that muscle damage has occurred, with CK-MB (the heart-associated form) supporting the cardiac source of the injury.