Changes in the Lumbar Cerebro-spinal Fluid during Air-encephalography

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Abstract
In 85 air encephalograms the cell count, protein and glucose concentrations have been observed and compared in two specimens of C.S.F. from each patient, the first obtained before the introduction of air into the lumbar theca and the second collected at the end of the procedure about 30 minutes later. There is often a significant rise in the cell count after the introduction of air and a less conspicuous but often significant fall in the protein concentration. No significant difference was found in the glucose concentration in the two specimens. The observations are considered to be consistent with the view that desquamation of arachnoid cells and entry of ventricular fluid into the lumar theca occurs during A.E.G. The observation is clinically important as C.S.F. obtained at the end of A.E.G. procedure, and for at least a week afterwards is not suitable for laboratory examination.

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