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Home / Equine Research Bank / Can J Vet Res / Effects of head position on internal and external carotid pr...
Canadian journal of veterinary research = Revue canadienne de recherche veterinaire2021; 85(2); 127-130;

Effects of head position on internal and external carotid pressures in standing sedated horses.

Abstract: The effects of head position on internal carotid artery (ICA) and external carotid artery (ECA) pressures in standing sedated horses were evaluated in this study. The common carotid artery (CCA) was catheterized in 6 horses using an ultrasound-guided technique to facilitate placement of a pressure transducer within the ICA and ECA at the level of the guttural pouch. Transducer position was confirmed by endoscopic visualization. Mean arterial pressure (MAP) was measured with horses in both a head-up and head-down position. The dorsal metatarsal artery was catheterized as a control. Maintaining a head-up position decreased MAP in both the ICA (median: 75.21 mmHg) and ECA (median: 79.43 mmHg), relative to the head-down position (ICA median: 104.65 mmHg; ECA median: 102.26 mmHg). Mean arterial pressure in the dorsal metatarsal artery was not affected by head position. The head-up position resulted in lower arterial pressures in both the ICA and ECA ( = 0.03) compared with the head-down position in standing sedated horses. Cette étude a évalué les effets de la position de la tête sur la pression artérielle au niveau de l’artère carotide interne (ICA) et de l’artère carotide externe (ECA) chez des chevaux sous sedation debout. L’artère carotide commune (CCA) a été cathétérisée chez six chevaux en utilisant une technique échoguidée pour faciliter le placement d’un transducteur de pression dans l’ICA et l’ECA au niveau de la poche gutturale. La position du transducteur a été confirmée par endoscopie. La pression artérielle moyenne (MAP) a été mesurée chez les chevaux avec la tête en position haute et en position basse. L’artère métatarsienne dorsale a été cathétérisée et a servi comme témoin. Les MAP enregistrées au niveau de l’ICA (médiane: 75,21 mmHg) et de l’ECA (médiane: 79,43 mmHg) lorsque la tête est en position élevée sont plus faibles que celles enregistrées lorsque la tête est en position basse (médiane ICA: 104,65 mmHg; médiane ECA: 102,26 mmHg). La MAP de l’artère métatarsienne dorsale n’a pas été affectée par la position de la tête. En conclusion, chez les chevaux sédatés et debout, la position élevée de la tête produit des pressions artérielles plus faibles au niveau de ICA et ECA ( = 0,03) que celles obtenues lorsque la tête est en position basse.(Traduit par les auteurs).
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Publication Date: 2021-04-23 PubMed ID: 33883820PubMed Central: PMC7995541
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  • Journal Article

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The study examines how a horse’s head position can affect the pressure within its internal (ICA) and external (ECA) carotid arteries. The researchers found that when the horse’s head is elevated, both arterial pressures decrease compared to when the head is lowered.

Methodology

  • Six horses were sedated and had their common carotid artery (CCA) catheterized using an ultrasound-guided method, to place a pressure transducer within the ICA and ECA around the region of the guttural pouch – an air sac in the horse’s head.
  • The exact positioning of the pressure transducer was confirmed via endoscopy, a method of viewing the inside of the body using a flexible tube with a camera.
  • The arterial pressures were measured when the horses were in a head-up and head-down position.
  • A control measurement was taken from the dorsal metatarsal artery, located in the horse’s hind limb, by also catheterizing it. This artery was chosen because its pressure was expected to remain unaffected by the position of the head.

Findings

  • When the horses’ heads were up, the mean arterial pressure (MAP) reduced for both ICA and ECA. The median measurements were 75.21 mmHg and 79.43 mmHg respectively.
  • These pressure levels were higher when the horse’s heads were down, with median results of 104.65 mmHg for the ICA and 102.26 mmHg for the ECA.
  • The MAP in the dorsal metatarsal artery did not fluctuate based on the head position, reaffirming its role as a valid control in this experiment.
  • Therefore, the position of the horse’s head was found to significantly affect the arterial pressures in the ICA and ECA (>0.03).

Implications and Conclusion

  • This investigation indicates that adjusting a horse’s head position can alter the arterial pressures in its head.
  • Future studies could investigate whether these changes in pressure have functional implications or effects on the horse’s overall health and behaviour.
  • Also, the findings could influence the management and treatment strategies of equine health professionals, particularly for interventions that involve the carotid arteries or the head area of horses.

Cite This Article

APA
Caffey SR, Lund CM, Farnsworth KD, Fransson BA, Ragle CA. (2021). Effects of head position on internal and external carotid pressures in standing sedated horses. Can J Vet Res, 85(2), 127-130.

Publication

Canadian journal of veterinary research = Revue canadienne de recherche veterinaire
ISSN: 1928-9022
NlmUniqueID: 8607793
Country: Canada
Language: English
Volume: 85
Issue: 2
Pages: 127-130

Researcher Affiliations

Caffey, Stacy R
  • Department of Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-6610, USA.
Lund, Caleb M
  • Department of Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-6610, USA.
Farnsworth, Kelly D
  • Department of Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-6610, USA.
Fransson, Boel A
  • Department of Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-6610, USA.
Ragle, Claude A
  • Department of Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-6610, USA.

MeSH Terms

  • Animals
  • Blood Pressure / physiology
  • Carotid Artery, External / physiology
  • Carotid Artery, Internal / physiology
  • Conscious Sedation / veterinary
  • Female
  • Head
  • Horses / physiology
  • Hypnotics and Sedatives / administration & dosage
  • Hypnotics and Sedatives / pharmacology
  • Imidazoles / administration & dosage
  • Imidazoles / pharmacology
  • Male
  • Posture

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Citations

This article has been cited 1 times.
  1. Vitoria A, Laborda A, Serrano-Casorrán C, Fuente S, Romero A, Vázquez FJ. Percutaneous Ultrasound-Guided Carotid Access and Puncture Closure with Angio-Seal in Horses. Animals (Basel) 2022 Jun 7;12(12).
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