Blood pressure response to tourniquet use in anesthetized horses.
Abstract: Blood pressure during anesthesia and surgery was compared for 2 groups of horses. Group A, consisting of 23 horses, had a tourniquet placed on the distal portion of a limb. The other group of 20 horses (group B) had surgery of comparable nature and duration as did group-A horses, but a tourniquet was not used. There was a statistical difference (P less than 0.05) in the peak systolic arterial blood pressure between the groups; group-A horses had a mean (+/- SEM) peak of 151 +/- 6 mm of Hg and group-B horses had a peak of 118 +/- 4 mm of Hg. In addition, group-A horses had immediate decrease in blood pressure, coincident with tourniquet deflation. The blood pressure decrease of 23 +/- 3 mm of Hg represented 16% of immediate predeflation blood pressure. Comparable blood pressure decrease was not observed at the end of surgery in group-B horses. Significant difference was not found when other factors that could affect blood pressure were considered. These factors included preanesthetic medication, anesthetic agents, mode of ventilation, pretourniquet inflation blood pressure, and duration of tourniquet inflation. Significant (P less than 0.05) difference in peak blood pressure was observed when the tourniquet was placed on the dependent, compared with the uppermost, limb, with changes more pronounced when the tourniquet was placed on the dependent limb. Tourniquet placement was associated with hypertension, and tourniquet deflation was associated with blood pressure decrease in these anesthetized horses.
Publication Date: 1989-10-15 PubMed ID: 2808099
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- Journal Article
Summary
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The research article explores the effect of tourniquet use on blood pressure in anesthetized horses during surgery. It finds that tourniquet placement can lead to increased blood pressure, but when deflated, results in immediate blood pressure decrease.
Research Methodology
- Two groups of horses were compared during anesthesia and surgery. Group A, with 23 horses, had a tourniquet placed on the distal portion of a limb. Group B, with 20 horses, underwent comparable surgery but without tourniquet use.
- Different factors that could impact blood pressure were considered, these included preanesthetic medication, anesthetic agents, mode of ventilation, pretourniquet inflation blood pressure, and duration of tourniquet inflation.
Key Findings
- The study found a significant difference in the peak systolic arterial blood pressure between the two groups. Group A horses had a mean peak of 151 +/- 6 mm of Hg, while Group B horses had a peak of 118 +/- 4 mm of Hg.
- Upon tourniquet deflation, Group A horses experienced an immediate decrease in blood pressure, a drop of 23 +/- 3 mm of Hg, representing 16% of immediate predeflation blood pressure. This drop in blood pressure was not observed in the horses from Group B at the end of the surgery.
- No significant differences were found when considering other factors that could impact blood pressure. This suggests that the observed changes in blood pressure were primarily due to the use of the tourniquet.
Conclusion
- There was a significant difference in peak blood pressure observed when the tourniquet was placed on the dependent limb compared to the uppermost limb. The changes were more pronounced when the tourniquet was placed on the limb that was dependent—i.e., more relied upon, suggesting a stronger link between tourniquet placement and hypertension.
- In conclusion, the study suggests tourniquet placement in anesthetized horses is associated with hypertension and tourniquet deflation leads to an immediate decrease in blood pressure.
Cite This Article
APA
Copland VS, Hildebrand SV, Hill T, Wong P, Brock N.
(1989).
Blood pressure response to tourniquet use in anesthetized horses.
J Am Vet Med Assoc, 195(8), 1097-1103.
Publication
Researcher Affiliations
- Department of Veterinary Surgery, University of California, Davis 95616.
MeSH Terms
- Analysis of Variance
- Anesthesia, General / veterinary
- Animals
- Blood Pressure
- Horse Diseases / etiology
- Horses / physiology
- Hypertension / etiology
- Hypertension / veterinary
- Tourniquets / veterinary
Citations
This article has been cited 3 times.- Cerullo M, Driessen B, Douglas H, Hopster K. Changes in Arterial Blood Pressure and Oxygen Tension as a Result of Hoisting in Isoflurane Anesthetized Healthy Adult Horses.. Front Vet Sci 2020;7:601326.
- Yavari S, Khraim N, Szura G, Starke A, Engelke E, Pfarrer C, Hopster K, Schmicke M, Kehler W, Heppelmann M, Kästner SBR, Rehage J. Evaluation of intravenous regional anaesthesia and four-point nerve block efficacy in the distal hind limb of dairy cows.. BMC Vet Res 2017 Nov 7;13(1):320.
- Gleerup KB, Forkman B, Lindegaard C, Andersen PH. An equine pain face.. Vet Anaesth Analg 2015 Jan;42(1):103-14.
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