Automatic noninvasive sphygmomanometry in horses.

The research investigates how well an indirect automatic oscillometric technique can gauge blood pressure and heart rate in horses, comparing the results to direct measurements from cannulation.

Objective and Methodology

• The aim of this research was to assess the efficacy of an indirect method called automatic oscillometric technique to determine blood pressure and heart rate in horses. The method employed is noninvasive and relies on sphygmomanometry, a process utilized for measuring the blood pressure.
• To ensure the obtained measurements were accurate, they were compared with direct measurements acquired from cannulation, which involves inserting a thin tube into a horse’s facial or dorsal metatarsal arteries.

Findings

• The research found a strong correlation between the direct and the indirect measurements, particularly when the heart rate was low and the sensitivity settings were optimal.
• Despite the overall effectiveness of the oscillometric technique, there were cases where it fell short. In fact, cardiac arrhythmias or hypotension (abnormally low blood pressure) prevented measurements from being attained in 9 horses, which constituted 12% of the total subjects in this study. This indicates limitations in this technique’s ability to calibrate in conditions where the heart rate or blood pressure are not normal.

Implications

• The study’s results offer support for the use of the automatic oscillometric technique for noninvasive monitoring of blood pressure and heart rate in horses, particularly in situations with lower heart rates.
• The technology could provide a more convenient and less stressful method of assessing these vital signs in horses compared to invasive methods like cannulation.
• Nonetheless, the study also highlights the limitations of this method in conditions such as hypotension or cardiac arrhythmias, lending to the necessity of continued reliance on traditional invasive methods for accurately assessing these conditions in horses.