[Creatine kinase BB sera in neonatal injury children (author's transl)]

The purpose of this study is to find, besides the determination of lactate in blood, a suitable and specific indicator of brain damage in newborn. Accordingly, we studied the total creatine kinase (CK) activity, by the method of Rosalki, and its subunit isoenzymes BB (CK BB) by fluorescence following electrophoresis on cellulose acetate. A first group (thirty newborns) without any disease represents our taest group. We havae found that the normal ranges for CK total were elevated (about 7 200 nkat/l). Electrophoresis of sera from these patients showed in addition to the normally migration isoenzyme (CK BB) was present in very small amounts, no sufficient for quantification. A second group was constituted to thirty ill newborns, with perinatal brain damage. In twenty-eight to thirty children, we find a significant correlation between the level of CK BB and brain insult. But, we have showed that it was necessary to take in consideration the time passed between the hypoxic insult and the blood puncture. Otherwise, we showed by immuno inhibition with specific antibody and by chromatography with gradient elution that identification of CK BB by electrophoresis cannot be misinterpreted. Furthermore, we demonstrated by this method, that position of CK 1 BB in blood is exactly the same that an purified human extract. This study concluded that a high level CK 1 BB in blood of newborn infants with perinatal brain damage has an accurately diagnosis value, if the blood puncture is done immediately during the severe CNS damage.