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Cerebrospinal fluid and serum immune complex in acute inflammatory polyneuritis. Detection by Clq binding assay.

Immune complexes (IC) were assessed in serum and CSF from 11 patients with acute inflammatory polyneuritis (AIP). An 125 I-labeled Clq binding assay (Clq BA) was used. IC were present in the sera of four patients and in the CSF of six. CSF-Clq BA of AIP (Group 1) were compared with 12 patients with other inflammatory neurological diseases (Group 2) and 22 patients with non-inflammatory neurological diseases (Group 3). There was only a significant difference between Group 1 compared to Group 3 (p less than 0.05). Serum and CSF IC did not correlate either with blood-brain barrier lesions or with immunoglobulin deposits in sural nerve biopsy.