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July 1958

Effect of Pneumoencephalography on Fluid and Electrolyte Metabolism

Author Affiliations

San Francisco
Neurosurgical and Pathology Services, Letterman Army Hospital, Presidio of San Francisco, and Chemistry Division, Sixth U. S. Army Medical Laboratory, Fort Baker, Calif.; Present addresses: Department of Neurological Surgery, University of California School of Medicine, San Francisco 22 (Dr. Wise). Harrison Department of Surgical Research, University of Pennsylvania School of Medicine, Philadelphia, (Dr. Pileggi).

AMA Arch Surg. 1958;77(1):113-116. doi:10.1001/archsurg.1958.01290010115021

Metabolic balance studies have helped to delineate changes in fluid and electrolyte metabolism consequent to various forms of bodily stress.1 These methods recently have been applied to patients with intracranial lesions.2,3 We thought that a similar study of patients undergoing pneumoencephalography might produce information regarding cerebral control of fluid and electrolyte metabolism.

Methods  Intake was limited to oral fluids, feeding formula, and intravenous fluids. The formulas were analyzed for sodium, potassium, chloride, and nitrogen. The bottles used for collecting urine were kept on ice. Stools were not collected.Twenty-four-hour urine specimens were analyzed for sodium and potassium by flame photometry, employing the Beckman Model DU spectrophotometer with Beckman Flame photometer attachment.4 Chlorides were determined by a modification of the Sendroy iodometric procedure.5 Nitrogen determinations were performed by the Pregl micro-Kjeldahl procedure, using selenium oxychloride as a catalyst. Aliquot samples from the 24-hour urine specimens were measured

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