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The Veterinary clinics of North America. Equine practice1990; 6(3); 485-494; doi: 10.1016/s0749-0739(17)30526-6

General clinical considerations for anesthesia of the horse.

Abstract: The peculiarities of the equine species present a number of unique situations that must be addressed when horses are anesthetized. Perhaps the most troublesome situation is related to the horse's size. Though the horse's large lungs are responsible in part for its sustainable athletic ability, they are detrimental to effective ventilation when the horse is anesthetized and placed in a recumbent position. Of major concern is depression of ventilation and cardiovascular function. Hypercapnia and hypoxemia usually result from hypoventilation, and with time all anesthetized horses suffer from some degree of cardiovascular depression. Decreased blood flow coupled with the horse's weight pressing downward on the undermost tissues frequently disturbs microcirculation and causes injury to muscle tissue. Of major importance is the product of anesthetic depth and anesthetic time. Only through careful observation and initiation of supportive measures can injuries related to anesthesia or surgery be kept to a minimum. Because of the horse's nature, safe anesthesia cannot always be assured, even when state-of-the-art anesthetic techniques are practiced.
Publication Date: 1990-12-01 PubMed ID: 2282543DOI: 10.1016/s0749-0739(17)30526-6Google Scholar: Lookup
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Summary

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The research article discusses the challenges presented by the horse’s unique physiology and size when undergoing anesthesia, including potential depression of ventilation and cardiovascular function, and injury to muscle tissues. It emphasizes the importance of careful observation and supportive measures to minimize the risks involved.

Unique Challenges for Horse Anesthesia

  • This study explores the difficulties that arise during the anesthesia of horses. Unlike other smaller animals, the size and physiology of horses can present unique issues.
  • The major complication here lies in the substantial size of horses. While their large lungs aid their athletic capacity, they complicate effective ventilation when anesthetized and placed in a recumbent position.
  • One key concern highlighted is the possible depression of respiratory and cardiovascular function. This can lead to hypercapnia (high carbon dioxide levels in the blood) and hypoxemia (low levels of oxygen in the blood).

Cardiovascular Depression and Tissue Injury

  • The research also suggests that all anesthetized horses may suffer some level of cardiovascular depression. This decrease in blood flow can disturb the microcirculation, leading to injuries in muscle tissue.
  • The weight of the anesthetized horse pressing down on underlying tissues can also contribute to these injuries. This necessitates the establishment of a balance between anesthetic depth and time to prevent negative impacts.

Importance of Observation and Supportive Measures

  • The study underscores the need for careful observation and the timely initiation of supportive measures to mitigate injuries related to anesthesia or surgery.
  • Even with the most modern anesthetic strategies in place, the research admits that safe anesthesia can never be completely ensured due to the inherent characteristics of horses. However, these risks can be minimized with precautionary measures.

Overall Insights

  • The article provides crucial insights into equine anesthesia, highlighting the significance of the horse’s unique bodily structure and functions. It brings attention to the potential complications and risks associated with anesthetizing horses, thus paving the way for more improved and safer procedures.

Cite This Article

APA
Thurmon JC. (1990). General clinical considerations for anesthesia of the horse. Vet Clin North Am Equine Pract, 6(3), 485-494. https://doi.org/10.1016/s0749-0739(17)30526-6

Publication

ISSN: 0749-0739
NlmUniqueID: 8511904
Country: United States
Language: English
Volume: 6
Issue: 3
Pages: 485-494

Researcher Affiliations

Thurmon, J C
  • American College of Veterinary Anesthesiologists, Urbana, Illinois.

MeSH Terms

  • Anesthesia / adverse effects
  • Anesthesia / veterinary
  • Animals
  • Heart Rate
  • Horses / anatomy & histology
  • Horses / injuries
  • Horses / physiology
  • Muscles / blood supply
  • Muscles / injuries
  • Respiration
  • Respiration, Artificial / veterinary

Citations

This article has been cited 2 times.
  1. Haw A, Hofmeyr M, Fuller A, Buss P, Miller M, Fleming G, Meyer L. Butorphanol with oxygen insufflation corrects etorphine-induced hypoxaemia in chemically immobilized white rhinoceros (Ceratotherium simum). BMC Vet Res 2014 Oct 15;10:253.
    doi: 10.1186/s12917-014-0253-0pubmed: 25315767google scholar: lookup
  2. Brandenberger O, Kalinovskiy A, Körner J, Genn H, Burger R, Leser S. Effect of Bio-Electro-Magnetic-Energy-Regulation (BEMER) Horse Therapy on Cardiopulmonary Function and Recovery Quality After Isoflurane Anesthesia in 100 Horses Subjected to Pars-Plana Vitrectomy: An Investigator-Blinded Clinical Study. Animals (Basel) 2024 Dec 18;14(24).
    doi: 10.3390/ani14243654pubmed: 39765558google scholar: lookup