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Sökning: WFRF:(Ingvast Larsson Carina)

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  • Ekstrand, Carl, et al. (författare)
  • A quantitative approach to analysing cortisol response in the horse
  • 2016
  • Ingår i: Journal of Veterinary Pharmacology and Therapeutics. - : Wiley. - 0140-7783 .- 1365-2885. ; 39:3, s. 255-263
  • Tidskriftsartikel (refereegranskat)abstract
    • The cortisol response to glucocorticoid intervention has, in spite of several studies in horses, not been fully characterized with regard to the determinants of onset, intensity and duration of response. Therefore, dexamethasone and cortisol response data were collected in a study applying a constant rate infusion regimen of dexamethasone (0.17, 1.7 and 17g/kg) to six Standardbreds. Plasma was analysed for dexamethasone and cortisol concentrations using UHPLC-MS/MS. Dexamethasone displayed linear kinetics within the concentration range studied. A turnover model of oscillatory behaviour accurately mimicked cortisol data. The mean baseline concentration range was 34-57g/L, the fractional turnover rate 0.47-1.5 1/h, the amplitude parameter 6.8-24g/L, the maximum inhibitory capacity 0.77-0.97, the drug potency 6-65ng/L and the sigmoidicity factor 0.7-30. This analysis provided a better understanding of the time course of the cortisol response in horses. This includes baseline variability within and between horses and determinants of the equilibrium concentration-response relationship. The analysis also challenged a protocol for a dexamethasone suppression test design and indicated future improvement to increase the predictability of the test.
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  • Ekstrand, Carl, et al. (författare)
  • Cetirizine per os : exposure and antihistamine effect in the dog
  • 2018
  • Ingår i: Acta Veterinaria Scandinavica. - : BMC. - 0044-605X .- 1751-0147. ; 60
  • Tidskriftsartikel (refereegranskat)abstract
    • BackgroundCetirizine is an antihistamine used in dogs, but plasma concentrations in relation to effect after oral administration are not well studied. This study investigated cetirizine exposure and the plasma cetirizine concentration-antihistamine response relation in the dog following oral administration of cetirizine.ResultsEight Beagle dogs were included in a cross-over study consisting of two treatments. In treatment one, cetirizine 2-4mg/kg was administered per os once daily for 3days. The other treatment served as a control. Wheal diameter induced by intra-dermal histamine injections served as response-biomarker. Cetirizine plasma concentration was quantified by UHPLC-MS/MS. Median (range) cetirizine plasma terminal half-life was 10h (7.9-16.5). Cetirizine significantly inhibited wheal formation compared with the premedication baseline. Maximum inhibition of wheal formation after treatment with cetirizine per os was 100% compared with premedication wheal diameter. The median (range) IC50-value for reduction in wheal area was 0.33 mu g/mL (0.07-0.45). The median (range) value for the sigmoidicity factor was 1.8 (0.8-3.5). A behavioral study was also conducted and revealed no adverse effects, such as sedation.ConclusionThe results indicate that a once-daily dosing regimen of 2-4mg/kg cetirizine per os clearly provides a sufficient antihistamine effect. Based on this experimental protocol, cetirizine may be an option to treat histamine-mediated inflammation in the dog based on this experimental protocol but additional clinical studies are required.
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