Complement protein levels and C7 hemolytic activity were measured in four individuals following anesthesia and surgery, and in a group of 20 patients with inflammatory diseases. Seven of the eight complement components studied characteristically were elevated, most dramatically C1s and C3PA. Elevation of C1s often was greater than elevation of C1q, displaying an independent variation of C1s and C1q in both postoperative and inflammatory disease patient groups. The major increases of C components were seen subsequent to the peak C-reactive protein response, as was the occurrence of the ‘reactor state’, a propensity to formation of C56 which surprisingly was associated with increased levels of C7. Levels of properdin frequently were reduced postoperatively. It is concluded that multiple complement components, with the notable exception of properdin, respond as acute phase reactants which are elevated and changed in proportion postoperatively and during inflammatory disease.

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© 1975 S. Karger AG, Basel
1975
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