Evaluation of the Doppler ultrasonic method of measuring systolic arterial blood pressure in cats

J. L. Grandy From the Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences (Grandy, Dunlop, Hodgson) and the Statistics Department (Chapman), Colorado State University, Fort Collins, CO 80523.

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C. I. Dunlop From the Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences (Grandy, Dunlop, Hodgson) and the Statistics Department (Chapman), Colorado State University, Fort Collins, CO 80523.

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D. S. Hodgson From the Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences (Grandy, Dunlop, Hodgson) and the Statistics Department (Chapman), Colorado State University, Fort Collins, CO 80523.

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C. R. Curtis From the Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences (Grandy, Dunlop, Hodgson) and the Statistics Department (Chapman), Colorado State University, Fort Collins, CO 80523.

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P. L. Chapman From the Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences (Grandy, Dunlop, Hodgson) and the Statistics Department (Chapman), Colorado State University, Fort Collins, CO 80523.

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Summary

The accuracy of the Doppler technique for indirect systolic blood pressure measurement was assessed in 16 anesthetized cats. Eight cats were anesthetized with isoflurane and 8 were anesthetized with halothane. Anesthetic depth and mode of ventilation were varied to obtain a wide range of arterial blood pressure. A Doppler transducer was placed on the palmer surface of the left forelimb over the common digital branch of the radial artery to detect blood flow, and a blood pressure monitoring cuff with a width 37% the limb circumference was placed half way between the elbow and the carpus. To enable direct arterial pressure measurements, the left femoral artery was catheterized and the blood pressure waveforms recorded simultaneously.

Systolic blood pressure measured by use of the Doppler ultrasonic technique was significantly lower than that obtained from the femoral artery catheter. Using linear regression, we determined a clinically useful calibration adjustment for Doppler indirect blood pressure measurement in cats: femoral systolic pressure = Doppler systolic pressure + 14 mm of Hg.

Summary

The accuracy of the Doppler technique for indirect systolic blood pressure measurement was assessed in 16 anesthetized cats. Eight cats were anesthetized with isoflurane and 8 were anesthetized with halothane. Anesthetic depth and mode of ventilation were varied to obtain a wide range of arterial blood pressure. A Doppler transducer was placed on the palmer surface of the left forelimb over the common digital branch of the radial artery to detect blood flow, and a blood pressure monitoring cuff with a width 37% the limb circumference was placed half way between the elbow and the carpus. To enable direct arterial pressure measurements, the left femoral artery was catheterized and the blood pressure waveforms recorded simultaneously.

Systolic blood pressure measured by use of the Doppler ultrasonic technique was significantly lower than that obtained from the femoral artery catheter. Using linear regression, we determined a clinically useful calibration adjustment for Doppler indirect blood pressure measurement in cats: femoral systolic pressure = Doppler systolic pressure + 14 mm of Hg.

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