Depends: CPKs are enzymes inside the cell that are release after injury to the membrane cause by trauma,inflammation,ischemia or even excessive exercise.It comes in different isoforms depending on the cells it comes from such as skeletal,heart,liver,brain etc. So it can be chronic as in inflammation of skeletal muscles or transient as in trauma or heart attacks or induce by drugs.
Answered 12/2/2019
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