Abstract
Immunocytochemical study of human brain showed creatine kinase brain isoenzyme (CKBB) present in both neurons and astrocytes. Because creatine kinase brain isoenzyme is an intracellular enzyme that might be released with brain injury, its concentration in the CSF of newborns was measured using a radioimmunoassay. Infants who suffered a documented neurologic insult (a cerebroventricular hemorrhage or a CNS infection) were found to have a greater mean CSF creatine kinase brain isoenzyme concentration than those without a history of neurologic insult. Infants with a high concentration had a poor short-term outcome (death or neurologic abnormality when discharged) more frequently than did those with a lower concentration. Infants with a grade 3 or 4 cerebroventricular hemorrhage had a higher mean concentration than did those with a grade 1 or 2 hemorrhage. These data are consistent with the hypothesis that CSF creatine kinase brain isoenzyme is a metabolic indicator of brain damage in newborns.
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