Plasma concentrations of buprenorphine administered via matrix-type transdermal patches applied at three different anatomical locations in healthy adult horses.
Abstract: Anatomical location-dependent differences in transdermal opioid penetration are well described in human patients. Although this has been investigated in horses with fentanyl, there is no literature available on location-dependent plasma buprenorphine concentrations when administered as a transdermal matrix-type patch. Unassigned: This study aims to compare the plasma concentrations achieved from the matrix-type transdermal buprenorphine patches placed at different anatomical sites (metacarpus, gaskin, and ventral tail base) in healthy adult horses. Unassigned: This is a randomized experimental study with a Latin square design. Unassigned: Six adult horses were given each of three treatments with a minimum 10-day washout period. For each treatment, two 20 μg h matrix-type buprenorphine patches were applied to the ventral aspect of the tail base (Tail), metacarpus region (Metacarpus), or gaskin region (Gaskin). Whole blood samples (for determination of buprenorphine concentration) and physiological variables were collected before (0 h) and at 0.5, 2, 4, 6, 8, 10, 12, 16, 24, 32, 48, 56, 72, 96 and 120 h after patches were applied. The patches were removed 96 h following placement and were analyzed for residual buprenorphine content. Buprenorphine concentrations were measured in plasma by LC-MS/MS. A mixed-effects model was used to analyze the physiological variables. Unassigned: Between the three treatment groups, there was no change in physiological variables across timepoints as compared to baseline and when compared to each other in a single horse and between horses ( > 0.3). When comparing all three locations, the buprenorphine uptake was observed to be more consistent with respect to measurable plasma concentrations >0.1 ng ml when applied to the ventral aspect of the tail base. In the Tail group, the mean plasma buprenorphine concentrations were >0.1 ng ml from 2 to 32 h. The highest group mean was 0.25 ng ml noted at 4 h. Unassigned: The metacarpal and gaskin regions presented more erratic and inconsistent buprenorphine uptake and plasma concentrations as compared to the ventral aspect of the tail base. Further research must be directed at investigating the optimal dose, achievable duration of analgesia, change in measurable plasma concentrations, and behavioral and systemic effects.
© 2024 Paranjape, Knych, Berghaus, Giancola, Cathcart and Reed.
Publication Date: 2024-06-19 PubMed ID: 38962712PubMed Central: PMC11220193DOI: 10.3389/fpain.2024.1390322Google Scholar: Lookup
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Summary
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This study explored how the transdermal application of buprenorphine patches on different anatomical areas of a horse affects the drug’s concentration in the bloodstream. The results indicate that amongst three tested areas, the ventral base of the tail offered the most consistent drug uptake.
Research Aim
- The goal of this study was to compare plasma concentrations of buprenorphine, an opioid used for pain management, when administered via transdermal patches applied to different locations on a horse’s body, namely the tail base, metacarpus (lower leg), and gaskin (the area of the hind leg between the stifle and hock).
Methodology
- This was a randomized trial, with six adult horses undergoing three different treatments, each followed by a 10-day washout period to ensure no carryover effects.
- For each treatment, two buprenorphine patches were applied to the horse’s tail, lower leg, or gaskin.
- Blood samples were collected at varying intervals after the patches were applied, up to a total of 120 hours. Heart rate, respiratory rate, and body temperature were some of the physiological parameters that were monitored.
- The patches were then removed 96 hours post-application and tested for remaining buprenorphine content. A mixed-effects model was used to analyze the relationship between physiological variables and buprenorphine concentration in the bloodstream.
Findings
- The study found no significant change in physiological variables over time or between different horses when comparing the three treatment groups.
- Transdermal patches applied at the ventral base of the tail were found to be the most consistent in terms of measurable plasma buprenorphine concentrations.
- In the group where patches were applied to the tail base, the mean plasma buprenorphine concentrations were >0.1 ng/mL from 2 to 32 hours.
- The metacarpal and gaskin regions showed more erratic and inconsistent drug uptake and plasma concentrations as compared to the tail base.
Conclusion
- This research provides valuable insights into how placement affects the uptake of matrix-type transdermal buprenorphine patches in horses. However, further research is needed to ascertain the optimal dose, determine the duration of the drug’s analgesic effect, assess changes in measurable plasma concentrations, and understand related behavioral and systemic effects.
Cite This Article
APA
Paranjape VV, Knych HK, Berghaus LJ, Giancola S, Cathcart J, Reed RA.
(2024).
Plasma concentrations of buprenorphine administered via matrix-type transdermal patches applied at three different anatomical locations in healthy adult horses.
Front Pain Res (Lausanne), 5, 1390322.
https://doi.org/10.3389/fpain.2024.1390322 Publication
Researcher Affiliations
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States.
- K. L. Maddy Equine Analytical Pharmacology Laboratory, School of Veterinary Medicine, University of California-Davis, Davis, CA, United States.
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA, United States.
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA, United States.
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA, United States.
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA, United States.
Conflict of Interest Statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. The authors declared that they were an editorial board member of Frontiers, at the time of submission. This had no impact on the peer review process and the final decision.
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