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  • Title: Comparison of high definition oscillometric and Doppler ultrasonic devices for measuring blood pressure in anaesthetised cats.
    Author: Petric AD, Petra Z, Jerneja S, Alenka S.
    Journal: J Feline Med Surg; 2010 Oct; 12(10):731-7. PubMed ID: 20615734.
    Abstract:
    Indirect blood pressure measurements using high definition oscillometric (HDO) and Doppler devices were compared in 50 anaesthetised client-owned cats presented for various surgical procedures. Sites of cuff placement for Doppler were identified as forelimb and hindlimb and for HDO as forelimb and tail. Oscillometric and Doppler readings were obtained in 90.05% and 100% of attempts, respectively. Both devices enabled precise measurement of systolic arterial pressure (SAP), although the Doppler device gave higher precision. In the low pressure group (SAP<100 mmHg; n=30), 66.7% biases were within 10 mmHg of discrepancy, but in groups of normal (100 mmHg ≤ SAP ≤ 150 mmHg; n=120) and high measurements (SAP>150 mmHg; n=62), 86.7% and 75.0% of discrepancy, respectively, were lower than 10 mmHg. Frequency of discrepancy at the range of 15 mmHg showed similar differences between pressure groups. There were significantly higher discrepancies when the cuff was positioned on the tail rather than on the leg. The SAP value obtained by HDO can be calculated from the Doppler measurement from SAP (HDO)=0.8515 × SAP (Doppler)+19.221 mmHg. Compared to Doppler, HDO overestimated low pressure and underestimated high pressure values.
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