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31.
REASONS FOR PERFORMING STUDY: In order to evaluate its potential as an adjunct to inhalant anaesthesia in horses, the pharmacokinetics of fentanyl must first be determined. OBJECTIVES: To describe the pharmacokinetics of fentanyl and its metabolite, N-[1-(2-phenethyl-4-piperidinyl)maloanilinic acid (PMA), after i.v. administration of a single dose to horses that were awake in Treatment 1 and anaesthetised with isoflurane in Treatment 2. METHODS: A balanced crossover design was used (n = 4/group). During Treatment 1, horses received a single dose of fentanyl (4 microg/kg bwt, i.v.) and during Treatment 2, they were anaesthetised with isoflurane and maintained at 1.2 x minimum alveolar anaesthetic concentration. After a 30 min equilibration period, a single dose of fentanyl (4 microg/kg bwt, i.v.) was administered to each horse. Plasma fentanyl and PMA concentrations were measured at various time points using liquid chromatography-mass spectrometry. RESULTS: Anaesthesia with isoflurane significantly decreased mean fentanyl clearance (P < 0.05). The fentanyl elimination half-life, in awake and anaesthetised horses, was 1 h and volume of distribution at steady state was 0.37 and 0.26 l/kg bwt, respectively. Anaesthesia with isoflurane also significantly decreased PMA apparent clearance and volume of distribution. The elimination half-life of PMA was 2 and 1.5 h in awake and anaesthetised horses, respectively. CONCLUSIONS AND POTENTIAL RELEVANCE: Pharmacokinetics of fentanyl and PMA in horses were substantially altered in horses anaesthetised with isoflurane. These pharmacokinetic parameters provide information necessary for determination of suitable fentanyl loading and infusion doses in awake and isoflurane-anaesthetised horses. 相似文献
32.
Effect of topical ophthalmic dorzolamide(2%)–timolol(0.5%) solution and ointment on intraocular pressure in normal horses
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Whitley NT Corzo-Menendez N Carmichael NG McGarry JW 《The Journal of small animal practice》2005,46(2):75-78
A case of angiostrongylosis is described in a 14-month-old golden retriever bitch. Conjunctival haemorrhage and neurological signs, referable to a space-occupying cerebral lesion, were associated with defective primary haemostasis caused by low levels of von Willebrand factor. Full clinical recovery followed treatment with desmopressin, fresh whole blood transfusion, fenbendazole and supportive care. The magnetic resonance image of the suspected organising haematoma is described. Similarities to the human condition, acquired von Willebrand syndrome, and a possible role for aberrant larval migration in haematoma formation are suggested. 相似文献
37.
Behrend EN Weigand CM Whitley EM Refsal KR Young DW Kemppainen RJ 《Journal of the American Veterinary Medical Association》2005,226(10):1662-6, 1659
A dog was evaluated for clinical signs suggestive of hypercortisolemia. Serum biochemical testing revealed hypernatremia and hypokalemia. Serum cortisol concentration after injection of ACTH was less than the lower reference limit. An adrenal gland tumor was visualized via ultrasonography and computed tomography. Histologic examination confirmed that the mass was an adrenocortical carcinoma. Excess adrenal secretion of corticosterone was hypothesized to be the cause of the signs of glucocorticoid excess. Serum corticosterone secretion was high before and after ACTH injection, compared with clinically normal dogs and dogs with hypercortisolemia and classic hyperadrenocorticism. Hyperaldosteronemia was detected as well. Treatment with mitotane was instituted and successful for a period of 4-months until the dog was euthanatized for neurologic problems that were most likely unrelated to endocrine disease. 相似文献
38.
An 11-year-old spayed female Miniature Poodle presented with bilateral senile cataracts. Treatment was cataract removal by phacoemulsification and intraocular lens implantation. Five hours after surgery the operated right eye was partially closed and painful. The right pupil was fully dilated, there was generalized corneal edema, and intraocular pressure (IOP) was increased. After 12 h of medication IOP was controlled. Ten weeks after surgery the owners reported cloudiness of right eye, and the dog was again evaluated. The IOP was again increased and an Ahmed valve was implanted. This case describes describe the progression of this case and benefits of controlling postcataract surgery glaucoma by the implantation of an Ahmed valve. 相似文献
39.
Hypokalemia and suspected renal tubular acidosis associated with topical carbonic anhydrase inhibitor therapy in a cat
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40.
A Novel Imaging System Distinguishes Neoplastic from Normal Tissue During Resection of Soft Tissue Sarcomas and Mast Cell Tumors in Dogs
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