Practice Quiz

NCLEX-RN

Category - Reduction of Risk

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A female client was admitted to the emergency department after complaining of substernal chest pain unrelieved by nitrates. A series of laboratory tests is initiated. Which of the following is not a specific indicator of cardiac muscle damage?
  1. CK-MB
  2. Troponin 1
  3. Myoglobin
  4. LDH
Explanation
Answer: C - Myoglobin is not a specific indicator of cardiac muscle damage. Myoglobin is a protein found in the heart and skeletal muscles. The nurse should understand that it is not specific to the heart muscle. If myocardial or skeletal muscle is damaged, myoglobin is released into the bloodstream. Massive muscle damage causes the release of high levels of myoglobin into the blood. Too much myoglobin can damage the kidneys, which help remove myoglobin from the body.
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