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May 1958

Encephalography by the Displacement Technique

Author Affiliations

New York

From the Second (Cornell) Neurological Division, Bellevue Hospital, and the Department of Medicine, Cornell University Medical College.

AMA Arch NeurPsych. 1958;79(5):498-505. doi:10.1001/archneurpsyc.1958.02340050026002

The commonly accepted technique of performing encephalography has been to replace a volume of spinal fluid with an equal volume of air or other gases. Adaptations of this technique have been made by Gardner and Nichols,1 by Davidoff and Dyke,2 and by Lindgren,3 who used smaller quantities of gas and/or first injected air before withdrawing any spinal fluid. In 1955 Slosberg et al.4 introduced a new technique of encephalography, which was called the "minimal withdrawal technique." This consisted of injecting 10 to 80 cc. of air into the lumbar subarachnoid space while withdrawing no more than 5 cc. of spinal fluid. A group of 35 patients was studied. Three of these had early papilledema, and four had spinal fluid pressures above 200 mm. H2O.5 An average of 44 cc. of air was injected. Five patients had no headache during the procedure, but these

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