Comparison of non-invasive and invasive blood pressure measurements in horses during anaesthesia using the oscillometric blood pressure Monitor S/R Datex Ohmeda

Fouché, Nathalie Elisa; Auer, Ulrike; Iff, Isabelle (2016). Comparison of non-invasive and invasive blood pressure measurements in horses during anaesthesia using the oscillometric blood pressure Monitor S/R Datex Ohmeda. Pferdeheilkunde, 32, pp. 479-484. Hippiatrika Verlagsgesellschaft 10.21836/PEM20160509

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The purpose of this study was to assess the performance of indirect blood pressure measurements with an oscillometric blood
pressure monitor (S/5, Datex-Ohmeda) in anaesthetized horses. The study was conducted as a prospective experimental study. Seven adult
horses, five geldings and two mares, were used in this study. The average age was 15±8 years (mean±SD) and the horses were weighing
between 485 and 654kg. Invasive and non-invasive blood pressure measurements were recorded simultaneously and a total of 263 values
were analyzed. The number of measurements obtained in each horse depended on the anaesthesia time (104–225 minutes). Bland and
Altman analysis for repeated measurements was used for assessment of the data. Overall the most accurate measurement was achieved
with mean arterial pressure (MAP) measurement with a bias of 5mmHg compared to a bias of 7mmHg in the systolic arterial pressure
(SAP) and of 9mmHg in the diastolic arterial pressure (DAP). The MAP proved to be the most precise in the low arterial blood pressure
group (3mmHg) followed by the medium arterial blood pressure group (5mmHg). These results show that non-invasive blood pressure
measurements with Datex Ohmeda (S/5, Datex-Ohmeda, S/5™ Collect, Datex-Ohmeda) monitoring can be an adequate alternative to
measure blood pressure in anaesthetized horses when invasive blood pressure measurement cannot be performed. Besides monitoring of
anaesthesia, non-invasive blood pressure measurement can be very helpful in alert horses due to its non-stressful and non-invasive nature.
Further comparable projects are required in awake patients and data collected in this study could serve as a basis for that.

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