Adalaïs Gibert, Ryota Watanabe, Marta Garbin, Tristan Juette, Francis Beaudry, Marion Desmarchelier, Inga-Catalina Cruz Benedetti
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引用次数: 0
Abstract
Objective: To evaluate the pharmacokinetics and pharmacodynamics of a single oral dose of trazodone in laboratory rabbits.
Study design: Randomised, blinded, Latin-square study.
Animals: A group of eight healthy, juvenile, female New Zealand White rabbits.
Methods: Auricular venous catheters were placed in six rabbits before oral trazodone (20 mg kg-1) administration. Blood was sampled immediately before and at 15 and 30 minutes and 1, 2, 4, 8, 12, 18 and 24 hours after treatment. Trazodone plasma concentrations were determined using high-performance liquid chromatography-mass spectrometry. A group of eight rabbits were equipped with accelerometers (activity) and video recorded. They randomly received one of three treatments: oral trazodone (20 mg kg-1; TRAZ), placebo (corn oil base; PLAC) or no treatment (CONTR) with a 3 day washout period between treatments. Exploring, grooming, resting, vigilance, hiding and ingesting behaviours were evaluated for 10 hours (0-2, 2-4, 4-6, 6-8 and 8-10 hours).
Results: Mean maximum plasma concentration, 6592.6 ± 586.5 ng mL-1, was 0.3 ± 0.11 hours after treatment. Mean half-life was 3.24 ± 0.36 hours and area under the curve from zero to infinity 25,412.5 ± 5420.9 ng mL-1 hour-1. Activity was higher in TRAZ and PLAC than CONTR at 0-2 hours, with TRAZ exploring more. Hiding was reduced in TRAZ versus CONTR (0-2 hours and 4-6 hours) and versus PLAC (0-6 hours). Resting increased in TRAZ versus PLAC (2-4 hours) and CONTR (4-6 hours); PLAC rested less at 2-4 hours than at 8-10 hours. Vigilance tended to be lower in TRAZ versus CONTR. Food intake decreased in TRAZ at 2-4 hours. Grooming varied over time.
Conclusions and clinical relevance: Trazodone-treated animals showed reduced activity, less hiding and more resting than PLAC and decreased food intake 2-4 hours post-treatment.
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.