{"title":"马匹透皮给药后丁丙诺啡的药代动力学、药效学和抗镇痛作用。","authors":"","doi":"10.1016/j.vaa.2024.05.001","DOIUrl":null,"url":null,"abstract":"<div><h3>Objective</h3><p>This study describes the pharmacokinetics and pharmacodynamics, including antinociceptive effects, of a transdermal buprenorphine solution in horses. It was hypothesized that transdermal application would lead to sustained blood concentrations and antinociceptive effects with fewer adverse effects compared with intravenous (IV) injection.</p></div><div><h3>Study design</h3><p>Prospective nonrandomized four-part parallel experimental study.</p></div><div><h3>Animals</h3><p>A group of eight horses (three mares and five geldings) aged 6–12 years.</p></div><div><h3>Methods</h3><p>Horses were administered incremental doses of 15, 30 and 45 μg kg<sup>–1</sup> of buprenorphine transdermal solution and a single IV dose of 5 μg kg<sup>–1</sup> of buprenorphine with a 2 week washout period between treatments. Concentrations of buprenorphine were determined in plasma using liquid chromatography–tandem mass spectrometry and modeled using a nonlinear mixed effects population pharmacokinetic model to determine pharmacokinetic parameters. Pharmacodynamic effects, including changes in locomotor activity, heart rate, body temperature, gastrointestinal borborygmi, thermal and mechanical nociceptive thresholds were recorded. Mixed effects analysis of variance and <em>post hoc</em> comparisons were performed using a Bonferroni multiple comparison adjustment to assess differences in pharmacodynamic parameters between baseline and each time point within each dose group and between dose groups at the same time point.</p></div><div><h3>Results</h3><p>Transdermal application of buprenorphine resulted in low systemic concentrations relative to IV injection. Bioavailability after transdermal application was 11%. Thermal nociceptive thresholds were significantly (<em>p</em> < 0.05) increased (4.3–10.7% relative to baseline) for up to 72 hours in the IV dose group, but only sporadically in the transdermal dose groups (2.5–9.9% relative to baseline). Changes in locomotor activity, heart rate and borborygmi varied over time and with dose.</p></div><div><h3>Conclusions and clinical relevance</h3><p>Limited thermal antinociceptive effects were observed at the transdermal doses studied likely owing to limited absorption relative to IV dosing. Future studies may be directed toward investigating antinociceptive effects of higher transdermal doses and different application sites.</p></div>","PeriodicalId":23626,"journal":{"name":"Veterinary anaesthesia and analgesia","volume":null,"pages":null},"PeriodicalIF":1.4000,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1467298724000783/pdfft?md5=aa5d60e33b32860bd064f77aa9fa9ba7&pid=1-s2.0-S1467298724000783-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Pharmacokinetics, pharmacodynamics and antinociceptive effects of buprenorphine following transdermal administration to horses\",\"authors\":\"\",\"doi\":\"10.1016/j.vaa.2024.05.001\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Objective</h3><p>This study describes the pharmacokinetics and pharmacodynamics, including antinociceptive effects, of a transdermal buprenorphine solution in horses. It was hypothesized that transdermal application would lead to sustained blood concentrations and antinociceptive effects with fewer adverse effects compared with intravenous (IV) injection.</p></div><div><h3>Study design</h3><p>Prospective nonrandomized four-part parallel experimental study.</p></div><div><h3>Animals</h3><p>A group of eight horses (three mares and five geldings) aged 6–12 years.</p></div><div><h3>Methods</h3><p>Horses were administered incremental doses of 15, 30 and 45 μg kg<sup>–1</sup> of buprenorphine transdermal solution and a single IV dose of 5 μg kg<sup>–1</sup> of buprenorphine with a 2 week washout period between treatments. Concentrations of buprenorphine were determined in plasma using liquid chromatography–tandem mass spectrometry and modeled using a nonlinear mixed effects population pharmacokinetic model to determine pharmacokinetic parameters. Pharmacodynamic effects, including changes in locomotor activity, heart rate, body temperature, gastrointestinal borborygmi, thermal and mechanical nociceptive thresholds were recorded. Mixed effects analysis of variance and <em>post hoc</em> comparisons were performed using a Bonferroni multiple comparison adjustment to assess differences in pharmacodynamic parameters between baseline and each time point within each dose group and between dose groups at the same time point.</p></div><div><h3>Results</h3><p>Transdermal application of buprenorphine resulted in low systemic concentrations relative to IV injection. Bioavailability after transdermal application was 11%. Thermal nociceptive thresholds were significantly (<em>p</em> < 0.05) increased (4.3–10.7% relative to baseline) for up to 72 hours in the IV dose group, but only sporadically in the transdermal dose groups (2.5–9.9% relative to baseline). Changes in locomotor activity, heart rate and borborygmi varied over time and with dose.</p></div><div><h3>Conclusions and clinical relevance</h3><p>Limited thermal antinociceptive effects were observed at the transdermal doses studied likely owing to limited absorption relative to IV dosing. Future studies may be directed toward investigating antinociceptive effects of higher transdermal doses and different application sites.</p></div>\",\"PeriodicalId\":23626,\"journal\":{\"name\":\"Veterinary anaesthesia and analgesia\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.4000,\"publicationDate\":\"2024-05-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S1467298724000783/pdfft?md5=aa5d60e33b32860bd064f77aa9fa9ba7&pid=1-s2.0-S1467298724000783-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Veterinary anaesthesia and analgesia\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1467298724000783\",\"RegionNum\":2,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"VETERINARY SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Veterinary anaesthesia and analgesia","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1467298724000783","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"VETERINARY SCIENCES","Score":null,"Total":0}
Pharmacokinetics, pharmacodynamics and antinociceptive effects of buprenorphine following transdermal administration to horses
Objective
This study describes the pharmacokinetics and pharmacodynamics, including antinociceptive effects, of a transdermal buprenorphine solution in horses. It was hypothesized that transdermal application would lead to sustained blood concentrations and antinociceptive effects with fewer adverse effects compared with intravenous (IV) injection.
A group of eight horses (three mares and five geldings) aged 6–12 years.
Methods
Horses were administered incremental doses of 15, 30 and 45 μg kg–1 of buprenorphine transdermal solution and a single IV dose of 5 μg kg–1 of buprenorphine with a 2 week washout period between treatments. Concentrations of buprenorphine were determined in plasma using liquid chromatography–tandem mass spectrometry and modeled using a nonlinear mixed effects population pharmacokinetic model to determine pharmacokinetic parameters. Pharmacodynamic effects, including changes in locomotor activity, heart rate, body temperature, gastrointestinal borborygmi, thermal and mechanical nociceptive thresholds were recorded. Mixed effects analysis of variance and post hoc comparisons were performed using a Bonferroni multiple comparison adjustment to assess differences in pharmacodynamic parameters between baseline and each time point within each dose group and between dose groups at the same time point.
Results
Transdermal application of buprenorphine resulted in low systemic concentrations relative to IV injection. Bioavailability after transdermal application was 11%. Thermal nociceptive thresholds were significantly (p < 0.05) increased (4.3–10.7% relative to baseline) for up to 72 hours in the IV dose group, but only sporadically in the transdermal dose groups (2.5–9.9% relative to baseline). Changes in locomotor activity, heart rate and borborygmi varied over time and with dose.
Conclusions and clinical relevance
Limited thermal antinociceptive effects were observed at the transdermal doses studied likely owing to limited absorption relative to IV dosing. Future studies may be directed toward investigating antinociceptive effects of higher transdermal doses and different application sites.
期刊介绍:
Veterinary Anaesthesia and Analgesia is the official journal of the Association of Veterinary Anaesthetists, the American College of Veterinary Anesthesia and Analgesia and the European College of Veterinary Anaesthesia and Analgesia. Its purpose is the publication of original, peer reviewed articles covering all branches of anaesthesia and the relief of pain in animals. Articles concerned with the following subjects related to anaesthesia and analgesia are also welcome:
the basic sciences;
pathophysiology of disease as it relates to anaesthetic management
equipment
intensive care
chemical restraint of animals including laboratory animals, wildlife and exotic animals
welfare issues associated with pain and distress
education in veterinary anaesthesia and analgesia.
Review articles, special articles, and historical notes will also be published, along with editorials, case reports in the form of letters to the editor, and book reviews. There is also an active correspondence section.