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Side 1 fra 25 resultater
Cardiovascular effects of ephedrine, caffeine and yohimbine measured by thoracic electrical bioimpedance in obese women.
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Low caloric diet is a commonly accepted treatment in obesity. However, owing to moderate results, a pharmacological support has been proposed. As some efficacious drugs activate overall sympathetic activity, they might modify functions of the cardiovascular system. Three groups of subjects were
Yohimbine/flumazenil antagonism of hemodynamic alterations induced by a combination of midazolam, xylazine, and butorphanol in dogs.
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Reversal of hemodynamic alterations induced by midazolam maleate (1.0 mg/kg of body weight), xylazine hydrochloride (0.44 mg/kg), and butorphanol tartrate (0.1 mg/kg) with yohimbine (0.1 mg/kg) and flumazenil (0.25 mg/kg) was evaluated in 5 dogs. The dogs were anesthetized with isoflurane for
Yohimbine modulates diaspirin crosslinked hemoglobin-induced systemic hemodynamics and regional circulatory effects.
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OBJECTIVE
Diaspirin crosslinked hemoglobin, a hemoglobin-based blood substitute, is proposed to be an effective resuscitative solution. It produces an immediate, but limited increase in blood pressure when administered to conscious or anesthetized rats. This vasoactivity is associated with an
The alpha 2-adrenergic receptor antagonist yohimbine inhibits epinephrine-induced platelet aggregation in healthy subjects.
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Onset of sudden death, myocardial infarction, and stroke occurs more likely in the morning hours. Similarly, a morning increase in epinephrine-induced platelet aggregation was observed accompanied by an increase in plasma catecholamines. Inhibition of the morning increase in platelet aggregation
Involvement of descending pain control system regulated by orexin receptor signaling in the induction of central post-stroke pain in mice.
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Central post-stroke pain (CPSP) is a type of neuropathic pain for which the mechanism and relevant drug pathways remain unknown. Recently, it was reported that intracerebroventricular (ICV) administration of orexin-A suppresses pain and ischemia. In this study, we tested the role of orexin-A in CPSP
Alpha 2-adrenoceptors in platelets of spontaneously hypertensive rats.
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Alpha 2-adrenoceptors were studied in platelets of stroke-prone spontaneously hypertensive rats (SpSHR) and of normotensive Wistar Kyoto control rats (WKY). In platelets of female SpSHR with established hypertension but not in those of normotensive WKY, specific binding of the alpha 2-adrenoceptor
The reflex control of heart rate and cardiac output in the rainbow trout: interactive influences of hypoxia, haemorrhage, and systemic vasomotor tone.
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In cannulated trout there was no cholinergic vagal tone as revealed by atropine blockade during normal heart rates. Reductions in heart rate occasionally occurred under normoxia without apparent external stimuli ('spontaneous' bradycardia) and always occurred under environmental hypoxia (hypoxic
Pharmacological characteristics of spinal alpha-adrenoreceptors in rats.
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1 Spinal alpha-adrenoreceptors involved in cardiovascular control have been investigated using selective alpha-adrenoreceptor agonists and antagonists in urethane-anaesthetized rats. 2 Intrathecal injections of clonidine, alpha-methylnoradrenaline, guanfacine and M7 at the C7-T1 level reduced blood
Expression of altered alpha2-adrenergic phenotypic traits in normotensive humans at genetic risk of hereditary (essential) hypertension.
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BACKGROUND
Essential (hereditary) hypertension is a common, though complex, trait with substantial heritability, but a still-obscure mode of inheritance. In this disorder with relatively late onset, knowledge of phenotypes with earlier penetrance would aid genetic analyses, as well as assessment of
Effects of alpha-adrenergic stimuli on mesenteric collecting lymphatics in the rat.
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The present study examined the effects of alpha 1- and alpha 2-adrenergic stimuli on rat mesenteric collecting lymphatics in vivo. Sprague-Dawley rats were anesthetized, and the mesentery was prepared for intravital microscopic study. Mesenteric collecting lymphatic diameter was continuously
Norepinephrine and brain damage: alpha noradrenergic pharmacology alters functional recovery after cortical trauma.
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The goal of these experiments was to evaluate the effects of some drugs affecting noradrenergic (NE) synaptic transmission, commonly prescribed following stroke or traumatic brain injury, on functional recovery. Measurement of recovery from a transient hemiplegia produced by a traumatic unilateral
Effects of catecholamines on hepatic and skeletal muscle mitochondrial respiration after prolonged exposure to faecal peritonitis in pigs.
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Use of norepinephrine to increase blood pressure in septic animals has been associated with increased efficiency of hepatic mitochondrial respiration. The aim of this study was to evaluate whether the same effect could be reproduced in isolated hepatic mitochondria after prolonged in vivo exposure
[Participation of central and peripheral I1-imidazollinovykh and alpha2-adrenergic receptors in realizing the effects of moxonidine].
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The role of the central and peripheral I1-imidazoline and alpha 2-adrenergic receptors in the development of hypotension and bradycardia induced by the intravenous injections of moxonidine was studied, in stroke-prone spontaneously hypertensive (SHR-SP) rats. The intravenous and local injections of
Pressor effects of the alpha 2-adrenoceptor agonist B-HT 933 in anaesthetized and haemorrhagic rats: comparison with the haemodynamic effects of amidephrine.
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1. Blood pressure responses to single and multiple bolus doses of the alpha 2-adrenoceptor agonist B-HT 933 were analysed in intact anaesthetized rats which were either normotensive or hypotensive as a result of haemorrhage. Single bolus doses of B-HT 933 in normotensive rats induced a fall in blood
[Effects of microinjection of clonidine into nucleus tractus solitarii on atrial natriuretic factor in rats].
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In order to study whether atrial natriuretic factor (ANF) is involved in the depressor effect of clonidine, microinjection of the latter into nucleus tractus solitarii (NTS) was carried out in anesthetized stroke-prone spontaneously hypertensive rats (SHRsp) and normotensive Wistar-Kyoto (WKY) rats.
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