Equine

Research Abstract

E24 - Comparison of Non-invasive, Invasive Central and Invasive Peripheral Blood Pressure in the Standing Horse

Thursday, June 14
6:00 PM - 6:15 PM
Location: WSCC 620

Accuracy and precision of devices that measure non-invasive blood pressure (NIBP) in horses are variable and there are no devices validated against central invasive blood pressure in the standing horse. The objective of this study was to compare invasive pressures obtained from the carotid artery (IBPc), facial artery (IBP) and NIBP.

An arterial catheter was placed in the transverse facial artery routinely and in the carotid artery under sonographic guidance. NIBP (coccygeal) was measured using a commercial oscillometric device (Mindray Passport 12) and corrected for the vertical distance between the base of the tail and the heart base. Measurements were obtained under baseline, high (dobutamine), and low (acepromazine) blood pressures. Mean bias, SD of the bias, and Pearson’s product correlation (R) were calculated from data obtained from 11 horses. 


Mean bias/SD of the bias/R between IBPc and IBP were -3 mmHg/12 mmHg / 0.92 for systolic, 2.8 mmHg/ 6.1 mmHg /0.96 for mean, and 5.5 mmHg/ 7.3 mmHg/ 0.91 for diastolic pressures. Mean bias/SD of the bias/R between IBPc, and NIBP were -1.3 mmHg/ 12.1 mmHg/ 0.91 for systolic, 6.4 mmHg/ 11.4 mmHg/ 0.86 for mean, and 10.1 mmHg/ 15.7 mmHg/ 0.72 for diastolic pressures. Mean bias/SD of the bias/R between IBP and NIBP were 0.1 mmHg/ 12.8 mmHg/ 0.91 for systolic, 3.2 mmHg/ 11.1 mmHg/ 0.88 for mean, and 4.7 mmHg/ 15.7 mmHg/ 0.72 for diastolic pressures.


Measuring IBPc without a surgical approach was feasible. IBP is an acceptable surrogate for IBPc but these are not interchangeable under all circumstances. The NIBP device tested had acceptable accuracy and precision for systolic pressure following ACVIM suggested criteria and approximated the criteria for mean blood pressure. Diastolic pressure measurements were less accurate and precise.

Natalia Rodriguez, DVM

Equine Medicine Fellow
Department of Large Animal Clinical Studies, Texas A&M University, College Station, TX, USA.

Natalia Rodriguez was born and raised in Bogota, Colombia. She graduated from Veterinary Medicine from the University of Georgia. Inmediately after graduation, she completed an equine internship at SouthWest Equine Hopsital in Scotsdale, AZ. She then completed a large animal medicine and surgery internship at Texas A&M University. During that time she performed research in equine blood pressure comparing peripheral vs invasive measurements. She is currently completing an equine internal medicine fellowship at Hagyard Equine Medical Institute and will be starting a large animal internal medicine residency back at Texas A&M University in july, 2018.

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E24 - Comparison of Non-invasive, Invasive Central and Invasive Peripheral Blood Pressure in the Standing Horse

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