scholarly journals Pharmacodynamics and plasma concentrations of dexmedetomidine with or without vatinoxan as a constant‐rate infusion in horses anaesthetized with isoflurane—A pilot study

2021 ◽  
Author(s):  
Stephan Neudeck ◽  
Lara Twele ◽  
Veronika Kopp ◽  
Sabine Kästner
Keyword(s):  
Pilot Study ◽  
Plasma Concentrations ◽  
Constant Rate Infusion ◽  
Constant Rate ◽  
Rate Infusion

The effect of a ketamine constant rate infusion on cardiovascular variables in sheep anesthetized at the minimum alveolar concentration of sevoflurane that blunts adrenergic responses

2022 ◽  
pp. 1-7
Author(s):  
Kevin Chang ◽  
Michele Barletta ◽  
Kristen M. Messenger ◽  
Daniel M. Sakai ◽  
Rachel A. Reed ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Minimum Alveolar Concentration ◽  
Plasma Concentrations ◽  
Face Mask ◽  
Constant Rate Infusion ◽  
Carbon Dioxide Rebreathing ◽  
Constant Rate ◽  
Significant Difference ◽  
Treatment Administration ◽  
Rate Infusion

Abstract OBJECTIVE To evaluate the effect of a constant rate infusion of ketamine on cardiac index (CI) in sheep, as estimated using noninvasive cardiac output (NICO) monitoring by partial carbon dioxide rebreathing, when anesthetized with sevoflurane at the previously determined minimum alveolar concentration that blunts adrenergic responses (MACBAR). ANIMALS 12 healthy Dorset-crossbred adult sheep. PROCEDURES Sheep were anesthetized 2 times in a balanced placebo-controlled crossover design. Anesthesia was induced with sevoflurane delivered via a tight-fitting face mask and maintained at MACBAR. Following induction, sheep received either ketamine (1.5 mg/kg IV, followed by a constant rate infusion of 1.5 mg/kg/h) or an equivalent volume of saline (0.9% NaCl) solution (placebo). After an 8-day washout period, each sheep received the alternate treatment. NICO measurements were performed in triplicate 20 minutes after treatment administration and were converted to CI. Blood samples were collected prior to the start of NICO measurements for analysis of ketamine plasma concentrations. The paired t test was used to compare CI values between groups and the ketamine plasma concentrations with those achieved during the previous study. RESULTS Mean ± SD CI of the ketamine and placebo treatments were 2.69 ± 0.65 and 2.57 ± 0.53 L/min/m2, respectively. No significant difference was found between the 2 treatments. Mean ketamine plasma concentration achieved prior to the NICO measurement was 1.37 ± 0.58 µg/mL, with no significant difference observed between the current and prior study. CLINICAL RELEVANCE Ketamine, at the dose administered, did not significantly increase the CI in sheep when determined by partial carbon dioxide rebreathing.

Counterregulation of insulin-induced hypoglycaemia in primary hypothyroidism

1986 ◽  
Vol 111 (4) ◽  
pp. 516-521
Author(s):  
Nina Clausen ◽  
Per-Eric Lins ◽  
Ulf Adamson ◽  
Bertil Hamberger ◽  
Suad Efendić
Keyword(s):  
Growth Hormone ◽  
Insulin Infusion ◽  
Primary Hypothyroidism ◽  
Constant Rate Infusion ◽  
Counterregulatory Hormones ◽  
Insulin Metabolism ◽  
Hormonal Responses ◽  
Glucose Levels ◽  
Constant Rate ◽  
Rate Infusion

Abstract. Hypothyroidism has been alleged to modulate insulin action and influence the secretion of growth hormone and catecholamines. We recently investigated the influence of hypothyroidism on glucose counterregulatory capacity and the hormonal responses to insulin-induced hypoglycaemia in 6 patients with primary hypothyroidism (age 32–52 years, TSH-values 66–200 mU/l). Hypoglycaemia was induced in the hypothyroid state and again when the subjects were euthyroid. After an overnight fast a constant rate infusion of insulin (2.4 U/h) was given for 4 h. Glucose was measured every 15 min and insulin, C-peptide, glucagon, epinephrine, norepinephrine, growth hormone and cortisol every 30 min for 5 h. During insulin infusion somewhat higher concentrations of the hormone were obtained in the hypothyroid state and simultaneously glucose levels were 0.5 mmol/l lower. As expected, basal norepinephrine levels were higher in hypothyroidism. However, no increase in circulating norepinephrine during hypoglycaemia was registered in the two experiments. The responses of counterregulatory hormones showed an enhanced response of cortisol, similar responses of growth hormone and epinephrine while the glucagon response was paradoxically impaired. Our findings suggest that hypothyroidism alters insulin metabolism, and that the glucagon response to hypoglycaemia is impaired in this condition.

Pharmacokinetics and pharmacodynamics of a constant rate infusion of fentanyl (5 μg/kg/h) in awake cats

2014 ◽  
Vol 75 (8) ◽  
pp. 716-721 ◽  
Author(s):  
Barbara Ambros ◽  
Jane Alcorn ◽  
Tanya Duke-Novakovski ◽  
Alexander Livingston ◽  
Patricia M. Dowling
Keyword(s):  
Pharmacokinetics And Pharmacodynamics ◽  
Constant Rate Infusion ◽  
Constant Rate ◽  
Awake Cats ◽  
Rate Infusion

Anaesthetic and cardiorespiratory effects of a constant-rate infusion of alfaxalone in desflurane-anaesthetised sheep

2012 ◽  
Vol 171 (5) ◽  
pp. 125-125 ◽  
Author(s):  
M. del Mar Granados ◽  
J. Manuel Domínguez ◽  
A. Fernández-Sarmiento ◽  
F. Javier Funes ◽  
J. Morgaz ◽  
...  
Keyword(s):  
Constant Rate Infusion ◽  
Constant Rate ◽  
Rate Infusion

Postoperative analgesic effects of either a constant rate infusion of fentanyl, lidocaine, ketamine, dexmedetomidine, or the combination lidocaine-ketamine-dexmedetomidine after ovariohysterectomy in dogs

2015 ◽  
Vol 42 (3) ◽  
pp. 309-318 ◽  
Author(s):  
Eduardo Gutierrez-Blanco ◽  
José M Victoria-Mora ◽  
José A Ibancovichi-Camarillo ◽  
Carlos H Sauri-Arceo ◽  
Manuel E Bolio-González ◽  
...  
Keyword(s):  
Constant Rate Infusion ◽  
Analgesic Effects ◽  
Constant Rate ◽  
Rate Infusion
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