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Various intranasal sedatives in canaries
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Canaries are patients which are difficult to anesthesize - as well by injection as by inhalation. The intranasal application seems to be a fascinating alternative. Can it be recommended? It can, as this new prospective randomized study shows.
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In this study the effects of intranasal benzodiazepines (midazolam and diazepam), á2-agonists (xylazine and detomidine) and their antagonists (flumazenil and yohimbine) in canaries were investigated. Twenty-six healthy adult domesticated canaries of both sexes, weighing 18.3 ± 1.0 g were included.
In Study 1 an attempt was made to determine the dose of each drug that allowed treated canaries to be laid in dorsal recumbency for at least 5 minutes, i.e. its effective dose.
This involved the evaluation of various doses, during which equal volumes of the tested drug were administered slowly into each nostril.
In study 2 the onset of action, duration and quality of sedation induced by each drug at its effective dose were evaluated. The efficacy of flumazenil and yohimbine in antagonizing the effects of the sedative drugs was also studied.
Results: In study 1 administration of 25 ìL per nostril diazepam (5 mg mL1 solution) or midazolam (5 mg mL1 solution) to each bird caused adequate sedation within 1–2 minutes; birds did not move when placed in dorsal recumbency.
After administration of 12 ìL per nostril of either xylazine (20 mg mL1) or detomidine (10 mg mL1), birds seemed heavily sedated and assumed sternal recumbency but could not be placed in dorsal recumbency.
Higher doses of xylazine (0.5 mg per nostril) or detomidine (0.25 mg per nostril) prolonged sedation but did not produce dorsal recumbency.
In study 2 in all treatment groups, onset of action was rapid. Duration of dorsal recumbency was significantly longer (p < 0.05) with diazepam (38.4 ± 10.5 minutes) than midazolam (17.1 ± 2.2 minutes).
Intranasal flumazenil (2.5 ìg per nostril) significantly reduced recumbency time. Duration of sedation was longer with á2-agonists compared with benzodiazepines. Detomidine had the longest duration of effect (257.5 ± 1.5 minutes) and midazolam the shortest (36.9 ± 2.4 minutes).
Nasally administered flumazenil significantly reduced the duration of sedation with diazepam and midazolam while yohimbine (120 ìg per nostril) effectively antagonized the effects of xylazine and detomidine.
Conclusion: Intranasal benzodiazepines produce rapid and effective sedation in canaries. Intranasal á2 agonists produce sedation but not sustained recumbency. Specific antagonists are also effective when used by this route.
Thus, intranasal sedative drug administration is an acceptable alternative method of drug delivery in canaries.
Source: Vesal, Nasser & Zare, Payman (2006): Clinical evaluation of intranasal benzodiazepines, á2-agonists and their antagonists in canaries. In: Veterinary Anaesthesia and Analgesia 33 (3), 143-148.
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