A patient is suspected of having a myocardial infarction. The nurse assesses for elevations in which of the following isoenzyme values reported with the creatine kinase level ?

Option 1 : MB

Concept:

• Myocardial Infarction = Heart Attack
• Myocardial Infarction -> It is a medical emergency that occurs when heart muscle begins to die due to lack of oxygen.
• In a patient with suspected myocardial infarction. The nurse assesses for elevations in higher than normal CK-MB enzymes, it may mean you have an inflammation of the heart muscle or are having or recently had a heart attack. 
• Normal reference range for serum CK MB range from 3 to 5% (percentage of total CK) or 5 to 25 IU/L.
• Creatinine kinase mainly has three isoenzymes
  • CK-MM
  • CK-MB
  • CK-BB (in cytoplasm)
• The majority of patients with acute MI will have elevation in troponins within 2 to 3 hours, and 6 to 12 hours with creatine kinase.

• If a person has higher than normal CK-MM enzymes, that depicts muscle injury or disease, such as muscular dystrophy or rhabdomyolis.
• If CK-MB enzymes are higher than normal, that depicts inflammation of the heart muscle or are having or recently had a heart attack.