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Effect of Hypocalcemia on the Calcium Content of the Parotid Saliva of Sheep¹

University of Maryland, College Park^,5

Abstract

Hypocalcemia was induced in six sheep by hemodialysis with an artificial kidney. As plasma calcium was decreased, parotid saliva calcium decreased. The direct relation of plasma calcium (Y in mg. per 100 ml. plasma) to parotid saliva calcium (X in mg. per 100 ml. saliva) could be expressed by the regression equation Y=3.8+4.3X. Since parotid secretion was devoid of calcium below an average plasma level of 3.8 mg. per 100 ml., the data suggest that a threshold level of plasma calcium greater than 3.8 mg. per 100 ml. is necessary before calcium will appear in parotid saliva.

¹ Scientific Article No. A-112, Contribution No. 3567 of the Maryland Agricultural Experiment Station. This paper is part of a thesis presented in partial fulfillment of the requirements for the Ph.D. degree, University of Maryland College Park.

² National Institutes of Health Fellow.

³ Present address: Veterans Administration Hospital, Washington, D. C. 20422.

⁴ Present address: Department of Surgery, College of Medicine, University of Utah, Salt Lake City, 84112.

⁵ Department of Dairy Science.

⁶ Travenol Laboratories, Inc., Mortou Grove, Illinois.