title: Diagnostic value of creatine kinase and creatine kinase MB isoenzyme in chronic hemodialysis patients: a longitudinal study.
abstract: Serial measurements of total creatine kinase (CK) and the MB isoenzyme of CK (CK-MB) were performed on 18 stable hemodialysis patients over a 36 month interval in a longitudinal study designed to examine CK and CK-MB variability. Total CK was measured by the DuPont ACA pack procedure. CK-MB was quantitated by the ACA CK-MB ion exchange pack procedure, and by electrophoresis. The mean CK level was 242 +/- 179 IU/l (+/- SD). The mean CK-MB level was approximately 8% of the total CK. Seventy-two percent of the patients had at least one elevated CK level during the course of this study. Depending upon the method of analysis, 88 to 100% of the patients had at least one elevated CK-MB level. Marked and sporadic variations in both total CK and CK-MB levels were apparent, but were not related to the assay. Patients receiving long-term intramuscular androgens had higher CK, but not CK-MB, than did hemodialysis patients not receiving these agents. Discontinuation of the intramuscular androgens for four weeks led to a fall in CK in only one of four patients. Therefore there appears to be a biological effect of exogenous androgens which may play a role in elevating CK in hemodialysis patients.
mesh_terms: D000328:Adult; D000368:Aged; D000728:Androgens / Q000008:administration & dosage; D003402:Creatine Kinase / Q000097:blood*; D006801:Humans; D007527:Isoenzymes; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000201:enzymology; D006435:Renal Dialysis
chemical_list: D000728:Androgens; D007527:Isoenzymes; D003402:Creatine Kinase