EXPRESS: Comparison of Thames Medical CAT+ Doppler and AutoCAT+ Automatic Blood Pressure Monitor devices for non-invasive blood pressure measurement in cats.

AutoCAT+ shows good agreement with Doppler ultrasound for feline blood pressure measurement in normotensive cats.

This comparative study evaluated the Thames Medical AutoCAT+ oscillometric device against the established Doppler method for non-invasive systolic blood pressure (SBP) measurement in cats. Researchers collected 131 paired measurements from 26 cats in a shelter setting, including 6 anaesthetised cats undergoing elective procedures and 20 conscious cats during routine health assessment. Mean SBP values were similar between methods (113.3 ± 23.9 mmHg for Doppler versus 116 ± 26.7 mmHg for oscillometric), with no significant difference. Anaesthetised cats demonstrated significantly lower SBP than conscious animals. Bland-Altman analysis revealed a small positive bias of the oscillometric method (3.07-4.93 mmHg across subgroups) with acceptable limits of agreement. Notably, both methods achieved 100% agreement in hypertension classification. The AutoCAT+ showed promising agreement with the Doppler standard in normotensive cats, though the authors acknowledge that validation within a broader blood pressure range, including hypotensive and hypertensive states, remains necessary for complete instrument qualification.

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