Point-of-care testing for interleukin-6 in cerebro spinal fluid (CSF) after subarachnoid haemorrhage.
BACKGROUND
Intrathecal interleukin (IL)-6 is considered to be a proinflammatory biomarker for cerebral inflammatory response. This is of clinical importance for the prediction of vasospasm after subarachnoid haemorrhage (SAH). We evaluated a bedside technique for the quantitative measurement of IL-6 in the cerebrospinal fluid (CSF).


METHODS
32 samples of CSF and serum were taken from 11 patients suffering from SAH on day 3, 4 and 5 after bleeding. A lateral flow immunoassay chip-test (POC-Test) was used for bedside testing and the results were compared to the standard chemiluminescence-based ELISA (Immulite) performed in a specialized laboratory.


RESULTS
For CSF analysis Immulite and POC-Test show linear correlation (r2=0.81). The high IL-6 values found in SAH are depicted more easily by the POC-Test, because it has a working range of up to 10.000 pg/ml instead of up to 1000 pg/ml for Immulite. Serum IL-6 values were clearly lower, suggesting CNS inflammation in SAH.


CONCLUSIONS
The new chip-test provides a handy tool for the neurosurgical intensive care unit, analysing CSF IL-6 concentrations within 20 minutes. This is the first time a point-of care test for IL-6 in CSF was evaluated. The test results match the values achieved by the standard Immulite technique. Therefore a tool for clinical routine interleukin-6 investigation is provided which could find use in a broad variety of neurosurgical and neurological diseases.
Dengler
Julius
J
Department of Neurosurgery, Charité-Universitätsmedizin Berlin, Campus Virchow Klinikum, Berlin, Germany.
Schefold
Joerg C
JC
Graetz
Daniela
D
Meisel
Christian
C
Splettstösser
Gerald
G
Volk
Hans-Dieter
HD
Schlosser
Hans-Georg
HG
D000328:Adult; D000368:Aged; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D015850:Interleukin-6 / Q000134:cerebrospinal fluid*; D049449:Luminescence; D008297:Male; D008875:Middle Aged; D019095:Point-of-Care Systems; D013345:Subarachnoid Hemorrhage / Q000134:cerebrospinal fluid*
D015850:Interleukin-6