BLOOD PRESSURE STUDIES IN SMALL ANIMALS

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Abstract
A method is presented for recording systolic and diastolic blood pressure values without the use of anesthesia in animals as small as the canary and the mouse. The values are higher in birds than in mammals of the same size, and are a characteristic of the species and not of the animal''s size. Blood pressure values in anesthetized mice averaged 113/81 mm. Hg. The rate of descent of arterial pressure during diastole, the size of the animal, the relative volume of the "Windkessel," and the length of diastole were correlated with each other. An equation is given which describes the relationship between the pressure and the volume elasticity coefficient of the arterial system.

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