Indirect Measurement of Mean Blood Pressure in the Normotensive and Hypotensive Horse

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Abstract
Indirect mean arterial pressure was obtained from the tails of 78 anesthetized and unanesthetized normotensive and hypotensive horses. The optimum cuff width in relation to tail circumference was determined. A cuff that is too wide underestimates and a cuff that is too narrow overestimates blood pressure. With the optimum cuff width, which is slightly in excess of .apprx. 1/5 of the tail circumference, indirect mean blood pressure was obtained consistently in normotensive and hypotensive animals with mean blood pressures of 40 mmHg and frequently in animals with pressure as low as 30 mmHg.

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