# Evaluation of Two Veterinary Oscillometric Noninvasive Blood Pressure (NIBP) Measurement Devices (petMAP Graphic II and High-Definition Oscillometry) in Dogs

## TL;DR

This study evaluates two noninvasive blood pressure devices in dogs and finds they are less accurate at high blood pressure levels.

## Contribution

The study provides insights into the performance of veterinary NIBP devices under varying blood pressure and vascular tone conditions.

## Key findings

- Both devices showed good agreement with invasive measurements at low blood pressure.
- At high blood pressure, both devices underestimated systolic arterial pressure.
- Moderate to good trending ability was observed for mean arterial pressure and systolic arterial pressure.

## Abstract

Reliable and valid blood pressure measurements are essential in many clinical situations. Hypo- or hypertension can have a great impact on vital organs. Unfortunately, extreme pressure ranges may negatively influence the reliability of noninvasive blood pressure monitors; particularly, anesthetic drugs affecting the vascular tone seem to have a negative impact. This study tested two veterinary oscillometric blood pressure devices, to see how well they matched invasive blood pressure measurements at different states of blood pressure and vascular tone, respectively. Seven healthy Beagle dogs were studied while awake and under anesthesia. The results showed that both devices became less accurate when blood pressure was high but were particularly underestimating the highest blood pressure values. Despite this, both devices were able to detect lower pressures and to track overall blood pressure trends reasonably well. When blood pressure is high, veterinarians should be cautious, as readings may not be accurate. This study highlights the importance of understanding the limitations of noninvasive blood pressure measurements in different situations for clinical decision making.

Noninvasive blood pressure (NIBP) device performance in dogs may be influenced by extreme pressures and altered systemic vascular resistance (SVR). This study evaluated the agreement of two NIBP devices (HDO and petMAP) with invasive blood pressure (IBP) measurements, compliance with hypertension consensus statement criteria, and their trending ability (TA) across varying blood pressure and SVR ranges in awake and anesthetized dogs. Seven healthy Beagles were studied, with IBP recorded from the dorsal metatarsal artery and NIBP cuffs placed randomly on the front limb, hind limb, or base of the tail. Cardiac output was determined by thermodilution, and the systemic vascular resistance index (SVRI) was calculated by a standard formula. Bland–Altman, concordance rate, and polar plot analyses were used for statistical analysis. A total of 752 and 640 paired measurements were obtained for HDO and petMAP, respectively. Both devices showed good agreement with IBP for mean arterial pressure (MAP) at low blood pressure and the SVRI. At high blood pressure and the SVRI, agreement weakened, with substantial underestimation of systolic arterial pressure (SAP). Both devices demonstrated moderate to good TA for MAP and SAP. Overall, the best agreement was observed for MAP at a low SVRI, while agreement was moderate at hypertension (petMAP) and a high SVRI (petMAP, HDO).