Approach to the Patient With HyperCKemia

Area of Science:

• Neurology
• Clinical Biochemistry

Background:

• Elevated serum creatine kinase (CK), known as hyperCKemia, is a common reason for neurological consultation.
• Evaluating hyperCKemia aims to identify treatable etiologies and guide management.

Observation:

• A thorough patient history and neurological examination are crucial for narrowing the differential diagnosis of hyperCKemia.
• Normal nerve conduction studies and EMG in neurologically intact individuals with hyperCKemia suggest a low likelihood of a specific diagnosis after further investigation.

Findings:

• A specific diagnosis for hyperCKemia is established in approximately 25% of cases after comprehensive workup.
• Higher CK levels and younger age are the strongest predictors for a higher diagnostic yield with further testing.
• The presence of muscle weakness increases the probability of identifying a specific cause beyond idiopathic or familial hyperCKemia.

Implications:

• While many hyperCKemia etiologies lack specific treatments, expectant management and patient-physician communication are essential.
• Further testing in hyperCKemia cases should be guided by clinical suspicion, CK levels, and patient age.
• Many individuals with idiopathic or familial hyperCKemia do not develop significant muscle disease over time.