Four hours after the onset of pain from an MI, the nurse would expect an increase in which laboratory result?

a. Alkaline phosphatase (ALP)
b. CK-MB
c. Lactate dehydrogenase (LDH)
d. Leukocyte count


B
Serum levels of CK-MB, an isoenzyme of creatine kinase (CK) found primarily in cardiac muscle, increase 3 to 6 hours after the onset of chest pain, peak in 12 to 18 hours, and return to normal levels in 2 to 3 days. CK-MB is one of the preferred cardiac enzymes for diagnosing myocardial infarction. The leukocyte count is measured as it does increase after MI, but is not diagnostic and does not have a predictable pattern of rise, peak, and return to normal. The other two options are not measured as part of the normal diagnostic workup for MI.

Nursing

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A) True B) False

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