Navegando por Palavras-chave "Equine"

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    Methadone Increases and Prolongs Detomidine-Induced Arterial Hypertension in Horses, but These Effects Are Not Mediated by Increased Plasma Concentrations of Arginine Vasopressin or Serum Concentrations of Catecholamines
    (Elsevier Science Inc, 2016) Pignaton, Wangles; Luna, Stelio Pacca Loureiro; Teixeira Neto, Francisco Jose; de Oliveira, Flavia Augusta; de Castro Neto, Eduardo Ferreira [UNIFESP]; Naffah-Mazzacoratti, Maria da Graca [UNIFESP]; Gozalo-Marcilla, Miguel
    Catecholamines and arginine vasopressin (AVP) release can affect arterial blood pressure (ABP) and hemodynamic stability in standing, sedated horses. Six mature horses were included in this prospective, randomized, crossover, blinded, experimental study. All the horses were sedated with detomidine (DET) alone (0.01 mg/kg, IV) or combined with methadone (MET) (0.01 mg/kg DET and 0.2 mg/kg MET, IV). Cardiopulmonary data and blood samples were collected 30 minutes before (prebaseline and baseline) and for 120 minutes postinjection. The combination DET/MET produced a significant increase (31%) in mean ABP (MAP) 5 minutes after drug administration which lasted for 120 minutes. Detomidine alone induced only a short-term increase in MAP (15%) at 5 minutes compared with baseline. There were significant differences between groups at 5, 15, and from 60 to 120 minutes. Plasma AVP concentrations were higher in horses receiving the treatment DET from 60 to 120 minutes than those in the combination group, for the same period. There were no significant differences in norepinephrine and epinephrine serum concentrations respect to baseline and between treatments. Detomidine induces a short-term MAP increase, and this effect was prolonged and potentiated by MET association. There is no evidence of AVP, norepinephrine, and epinephrine involvement in this effect. (C) 2016 Elsevier Inc. All rights reserved.
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    Methadone Increases and Prolongs Detomidine-Induced Arterial Hypertension in Horses, but These Effects Are Not Mediated by Increased Plasma Concentrations of Arginine Vasopressin or Serum Concentrations of Catecholamines
    (Elsevier Science Inc, 2016) Pignaton, Wangles; Luna, Stelio Pacca Loureiro; Teixeira Neto, Francisco Jose; de Oliveira, Flavia Augusta; de Castro Neto, Eduardo Ferreira [UNIFESP]; Naffah-Mazzacoratti, Maria da Graca [UNIFESP]; Gozalo-Marcilla, Miguel
    Catecholamines and arginine vasopressin (AVP) release can affect arterial blood pressure (ABP) and hemodynamic stability in standing, sedated horses. Six mature horses were included in this prospective, randomized, crossover, blinded, experimental study. All the horses were sedated with detomidine (DET) alone (0.01 mg/kg, IV) or combined with methadone (MET) (0.01 mg/kg DET and 0.2 mg/kg MET, IV). Cardiopulmonary data and blood samples were collected 30 minutes before (prebaseline and baseline) and for 120 minutes postinjection. The combination DET/MET produced a significant increase (31%) in mean ABP (MAP) 5 minutes after drug administration which lasted for 120 minutes. Detomidine alone induced only a short-term increase in MAP (15%) at 5 minutes compared with baseline. There were significant differences between groups at 5, 15, and from 60 to 120 minutes. Plasma AVP concentrations were higher in horses receiving the treatment DET from 60 to 120 minutes than those in the combination group, for the same period. There were no significant differences in norepinephrine and epinephrine serum concentrations respect to baseline and between treatments. Detomidine induces a short-term MAP increase, and this effect was prolonged and potentiated by MET association. There is no evidence of AVP, norepinephrine, and epinephrine involvement in this effect. (C) 2016 Elsevier Inc. All rights reserved.
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    Resposta esteroidogênica induzida por hCG em garanhões jovens Mangalarga: testosterona e sulfato de estrona plasmáticos
    (Faculdade de Medicina Veterinária e Zootecnia / Universidade de São Paulo, 2000-01-01) Lima, Samira Barbosa; Wischral, Aurea; Ferreira, Fernando; Verreschi, Ieda Therezinha do Nascimento [UNIFESP]; Universidade de São Paulo (USP); Universidade Federal de São Paulo (UNIFESP)
    Leydig cell acute steroidogenic response, in seven young Mangalarga stallions (2.6 - 4.5 ys), was evaluated through human Corionic Gonadotrophin (hCG) stimulation. The animals were treated with 5,000 UI (hCG) Vetecor®, i.v., in bollus, at 8 a.m. Plasma samples were collected by venopuncture at 7 a.m. (basal), 4, 24, 48, and 72 hours after stimulation (from 28 to August 31). Testosterone (T) and estrone sulphate (E1SO4) was measured by radioimmunoassay (RIA), intra-assay variation <= 5%. Data were analysed by Friedman and Wilcoxon Matched-Pairs tests (p <= 0.05). The magnitude of hormonal production after stimulation was analysed by Percentual Variation (delta %). At 48 hours, 57.1% of the animals (n = 4) had maximal response (T) with values 5.7 greater than basal. And although 57.1% of them (n = 4) had maximal response (E1SO4) at 4 hours, the maximal value was 1.6 greater than basal at 24 hours. The hCG may be employed to stimulate the Leydig cell steroidogenic response and 5,000 UI is enough to stimulate testicular steroidogenesis. The estrogen basal concentrations are higher than testosterone basal concentrations. This protocol could be applied to identify fertility problems of endocrine origin in horses of this breed.