Agreement of High-Definition Oscillometry (HDO) and Invasive Blood Pressure Measurements at a Metatarsal Artery in Isoflurane-Anaesthetised Horses.
Abstract: High-definition oscillometry (HDO) over the metatarsal artery (MA) in anaesthetised horses has not yet been evaluated. This study aimed to assess agreement between HDO and invasive blood pressure (IBP) at the metatarsal artery, and to evaluate compliance with the American College of Veterinary Internal Medicine (ACVIM) consensus guidelines. In this experimental study, 11 horses underwent general anaesthesia for an unrelated, terminal surgical trial. Instrumentation included an IBP catheter in one and an HDO cuff placed over the contralateral MA, as well as thermodilution catheters. Systolic arterial pressure (SAP), mean arterial pressure (MAP), diastolic arterial pressure (DAP), and cardiac output were measured simultaneously. Normotension (MAP 61-119 mmHg) was maintained during the surgical study. Subsequently, hypotension (MAP ≤ 60 mmHg) and hypertension (MAP ≥ 120 mmHg) were induced pharmacologically. For MAP, the agreement between HDO and IBP was acceptable during normotension, while during hypotension and hypertension, IBP was overestimated and underestimated by HDO, respectively. The monitor failed to meet most ACVIM validation criteria. Consequently, if haemodynamic compromise or rapid blood pressure changes are anticipated, IBP remains preferable.
Publication Date: 2022-02-02 PubMed ID: 35158686PubMed Central: PMC8833836DOI: 10.3390/ani12030363Google Scholar: Lookup
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Summary
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This study evaluates the use of high-definition oscillometry on the metatarsal arteries of horses under anaesthesia and concludes that though its measurements align with invasive blood pressure during normal blood pressure, it fails the test during instances of high and low blood pressure.
Research Goal
- The study aimed to test how effectively high-definition oscillometry (HDO) measures blood pressure over the metatarsal artery (MA) in anaesthetised horses. The investigators wanted to compare these measurements with invasive blood pressure (IBP), a standard and accepted method.
Methodology
- The study was carried out on 11 horses, all of which were under general anaesthesia for a separate, terminal surgery. A combination of different direct and indirect blood pressure measuring devices were used, including an IBP catheter on one side and an HDO cuff over the opposite MA, as well as thermodilution catheters.
- The experiment set out to keep the horses’ mean arterial pressure (MAP) between 61-119 mmHg (normotension) during the surgery. Hypotension (MAP ≤ 60 mmHg) and hypertension (MAP ≥ 120 mmHg) were induced pharmacologically after the surgery for further testing.
Findings
- HDO and IBP align well during periods of normotension. However, the HDO device overestimated during hypotension (low blood pressure) and underestimated during hypertension (high blood pressure).
- The study concluded that the reliability of the HDO monitor did not meet most of the validation criteria set by the American College of Veterinary Internal Medicine (ACVIM). Therefore, the researchers deduced that the traditional IBP method remained a more reliable tool when anticipating haemodynamic instability or quick changes in blood pressure.
Cite This Article
APA
Twele L, Neudeck S, Delarocque J, Verhaar N, Reiners J, Noll M, Tünsmeyer J, Kästner SBR.
(2022).
Agreement of High-Definition Oscillometry (HDO) and Invasive Blood Pressure Measurements at a Metatarsal Artery in Isoflurane-Anaesthetised Horses.
Animals (Basel), 12(3), 363.
https://doi.org/10.3390/ani12030363 Publication
Researcher Affiliations
- Clinic for Horses, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, 30559 Hannover, Germany.
- Small Animal Clinic, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, 30559 Hannover, Germany.
- Clinic for Horses, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, 30559 Hannover, Germany.
- Clinic for Horses, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, 30559 Hannover, Germany.
- AniCura Duisburg-Asterlagen Gmbh, Dr.-Detlev-Karsten-Rohwedder-Str. 11, 47228 Duisburg, Germany.
- Evidensia Tierärztliche Klinik für Kleintiere Norderstedt GmbH, Kabels Stieg 41, 22850 Norderstedt, Germany.
- Small Animal Clinic, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, 30559 Hannover, Germany.
- Small Animal Clinic, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, 30559 Hannover, Germany.
Grant Funding
- Deutsche Forschungsgemeinschaft and University of Veterinary Medicine Hannover, Foundation within the funding program Open Access Publishing
Conflict of Interest Statement
The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.
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