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Background  Blood pressure is relevant to the diagnosis and management of many medical, cardiovascular and critical diseases. The accuracy of many commonly used noninvasive blood pressure ( NIBP ) monitors and the accuracy of  NIBP  measurements in hypo‐ and hypertensive standing horses has not been determined.    Hypothesis/Objectives  The objective of this study was to investigate the accuracy of an oscillometric  BP  monitor in standing horses before and during pharmacologically induced hyper‐ and hypotension and to compare results in standing and anesthetized horses.    Animals  Eight standing mares from a research herd ( SG ) and eight anesthetized horses from a hospital population ( AG ).    Methods  Prospective experimental and observational studies. Invasive blood pressure ( IBP ) and  NIBP , corrected to heart level, were measured simultaneously. In the  SG  hyper‐ and hypotension were induced by administration of phenylephrine (3 μg/kg/min  IV  for 15 minutes) and acepromazine (0.05 mg/kg  IV ), respectively. In the  AG NIBP  and  IBP  were recorded during regular hospital procedures.    Results  There was a significant correlation between mean  NIBP  and  IBP  in standing ( R  = 0.88,  P  < .001) and anesthetized horses ( R  = 0.81,  P  < .001). The mean bias (lower, upper limit of agreement) was 16.4(−16.1, 48.9) mmHg for mean  BP  in the  SG  and 0.5(−22.3, 23.2) mmHg in the  AG . The  NIBP  device was capable of identifying the increase and decrease in  BP  in all horses, but in the  SG  significant correlation between  NIBP  and  IBP  was only detected for the normotensive phase.    Conclusion and Clinical Importance  While the evaluated oscillometric  BP  device allowed estimation of  BP  and adequately differentiated marked trends, the accuracy and precision were low in standing horses.

Accuracy and Precision of Noninvasive Blood Pressure in Normo‐, Hyper‐, and Hypotensive Standing and Anesthetized Adult Horses