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Ontogeny of epinephrine, norepinephrine, dopamine-beta-hydroxylase, and chromogranin A in the adrenal gland of pigs.
1996
Laroche S.M. | Pinxteren J.A. | Reempts P.J. van | Potter W.P. de | Weyns A.A. | Verhofstad A.A. | Acker K.J. van
Effect of hypercapnia on the arrhythmogenic dose of epinephrine in horses anesthetized with guaifenesin, thiamylal sodium, and halothane.
1993
Gaynor J.S. | Bednarski R.M. | Muir W.W. III
The effect of hypercapnia on the arrhythmogenic dose of epinephrine (ADE) was investigated in 14 horses. Anesthesia was induced with guaifenesin and thiamylal sodium and was maintained at an end-tidal halothane concentration between 0.86 and 0.92%. Base-apex ECG, cardiac output, and facial artery blood pressure were measured and recorded. The ADE was determined at normocapnia (arterial partial pressure of carbon dioxide [Pa(CO2)] = 35 to 45 mm of Hg), at hypercapnia (Pa(CO2) = 70 to 80 mm of Hg), and after return to normocapnia. Epinephrine was infused at arithmetically spaced increasing rates (initial rate = 0.25 micrograms/kg of body weight/min) for a maximum of 10 minutes. The ADE was defined as the lowest epinephrine infusion rate, to the nearest 0.25 micrograms/kg/min, at which 4 premature ventricular complexes occurred in a 15-second period. The ADE (mean +/- SD) during hypercapnia (1.04 +/- 0.23 micrograms/kg/min) was significantly (P < 0.05) less than the ADE at normocapnia (1.35 +/- 0.38 micrograms/kg/min), whereas the ADE after return to normocapnia (1.17 +/- 0.22 micrograms/kg/min) was not significantly different from those during normocapnia or hypercapnia. Baseline systolic and diastolic arterial pressures and cardiac output decreased after return to normocapnia. Significant differences were not found in arterial partial pressure of O2 (Pa(O2)) or in base excess during the experiment. Two horses developed ventricular fibrillation and died during normocapnic determinations of ADE. Hypercapnia was associated with an increased risk of developing ventricular arrhythmias in horses anesthetized with guaifenesin, thiamylal sodium, and halothane.
Mostrar más [+] Menos [-]Effects of bolus injection of epinephrine and norepinephrine on systolic time intervals in stress-resistant and stress-susceptible pigs.
1986
Malo D. | DeRoth L.
Localization of adrenergic receptors in bovine esophageal groove
1993
Kang, T.M. | Cho, J.Y. | Yang, I.S. (Seoul National University, Seoul (Korea Republic). College of Veterinary Medicine) | Park, J.H. (Cheju National University, Cheju (Korea Republic). College of Agriculture)
Effects of catecholamines on the smooth muscle strips of the cattle oesophageal groove
1991
Cho, J.Y. | Yang, I.S. (Seoul National Univ., Suwon (Korea Republic). Coll. of Veterinary Medicine)
Effects of sympathomimetics on motility in the longitudinal muscle of the cattle rumen
1994
Lim, H.J. | Han, H.J. | Han, G.K. (Chonnam National University, Kwangju (Korea Republic). College of Veterinary Medicine)
Pharmacological characteristics of higenamine on adrenergic beta-receptors
1992
Yun, H.I. (Chungnam Nat'l Univ., Taejon (Korea Republic). Coll. of Veterinary Medicine) | Chang, K.C. (Gyeongsang Nat'l Univ., Chinju (Korea Republic). Coll. of Medicine) | Lee, C.E. (Seoul Nat'l Univ., Suwon (Korea Republic). Coll of Veterinary Medicine)
