Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0004134 (ataxia)
 15,886 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Two dogs that had been given phenytoin for control of seizures for approximately 1 year developed signs of phenytoin toxicosis (postural ataxia an d a hypermetric gait) when chloramphenicol was added to the therapeutic regimen. The signs of toxicosis disappeared within 24 hours after cessation of chloramphenicol treatment. Oral treatment of laboratory dogs with chloramphenicol (50 mg/kg, TID for 3 days) prior to intravenous injection of phenytoin increased the half-life of phenytoin from 3 hours to 15 hours. Dogs infused with phenytoin during pentobarbital anesthesia had little or no change in serum phenytoin concentration during a 2-hour postinfusion observation period, which was unexpected for the intravenous route of administration.
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PMID:Interaction of phenytoin with chloramphenicol or pentobarbital in the dog. 50 Apr 38

Male albino rats given a bilateral injection of Baclofen (Lioresal) (12 micrograms/rat) in the cerebral ventricles showed a behavioral syndrome of activation + ataxia, paddling, tail-pinch hyperresponse and anesthesia. The phase of activation + ataxia was reduced by pretreatment of rats with H 44/68, FLA 63, reserpine, pimozide, phenoxybenzamine, oxypertine or chlorpromazine. The phase of paddling was reduced by pretreatment with FLA 63, reserpine, phenoxybenzamine, oxypertine, chlorpromazine, pimozide + phenoxybenzamine or apomorphine, while administration of clonidine instead of Baclofen caused paddling in non-pretreated rats. The phase of tail-pinch hyperresponse was reduced by reserpine, oxypertine, chlorpromazine or pimozide + phenoxybenzamine, while none of the pretreatments affected Baclofen-induced anesthesia. Drugs which affect mainly tryptaminergic or GABA-ergic functions failed to affect Baclofen-induced behaviors consistently. The findings suggest that dopaminergic and noradrenergic functions play a role in the central effects of Baclofen on behavior of rats.
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PMID:The role of monoamines for the central effects of Baclofen on behavior of rats. 52 96

We have compared the sleep-producing effects of thalidomide and pentobarbital. In a dose range that did not produce ataxia, thalidomide increased slow wave sleep and rapid eye movement sleep in cats (2-8 mg/kg p.o.) and rats (16 mg/kg p.o.). Pentobarbital had hypnotic activity in the same dose range but produced ataxia also at these doses. Thalidomide reduced spontaneous activity of both mice and rats. This occurred over a dose range of 8 to 1000 mg/kg p.o., but plateaued at a level of activity well above the complete inactivity of anesthesia that occurred with pentobarbital at well above the complete inactivity of anesthesia that occurred with pentobarbital at doses (greater than or equal to 32 mg/kg p.o.) above the hypnotic range. Several simple screens for thalidomide-like activity have been described which, together, could facilitate the search for thalidomide-like hypnotics. Pentobarbital, at doses 3 to 10 times the hypnotic range, prevented audiogenic seizures in physically dependent rats withdrawn from sodium barbital but thalidomide did not substitute for barbiturates even at doses 30 times those that increased sleep. Thalidomide, but not pentobarbital, enhanced the sleep-producing effect of electrical stimulation of basal forebrain in cats. The latter two findings suggest that thalidomide probably has a mechanism of action different from that of pentobarbital and that this may involve the activation of a sleep center in the forebrain.
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PMID:A comparison of thalidomide and pentobarbital - new methods for identifying novel hypnotic drugs. 56 42

Ketamine, a highly lipophilic drug, was rapidly distributed into highly vascular organs and subsequently redistributed to less well perfused tissues, with concurrent hepatic metabolism and urinary and biliary excretion, after both i. m. and i. v. administration in the rat. Halothane, a potent cardiovascular depressant, was found to prolong the plasma and brain half-life of ketamine (50 mg/kg i.m.) and also increased the duration of ketamine-induced ataxia when the two drugs were administered concomitantly. Halothane anesthesia (0.8% halothane in oxygen) produced a decrease in the rate of uptake and delayed distribution and redistribution of ketamine (50 mg/kg i. m.), while the rate of urinary excretion of ketamine was not significantly altered. Similarly, redistribution of intravenously administered ketamine (30 mg/kg i. v.) was slowed in the presence of halothane. In vitro hepatic microsomal metabolism of ketamine and its principle N-demethylated metabolite, metabolite I, was inhibited noncompetitively by halothane with inhibitor constants (Ki) for halothane estimated to be 1.56 and 1. 64 mM,respectively. The gas anesthetic also decreased the overall rate of in vivo metabolism of ketamine (30 mg/kg i. v.) in a concentration-dependent manner. Thus halothane anesthesia by decreasing uptake, distribution, redistribution and metabolism of intramuscularly administered ketamine produced significant prolongation of its pharmacologic action on the central nervous system. Our results imply that concomitant use of inhalational anesthetics may prolong pharmacologic actions of other agents via effects on distribution/redistribution processes as well as on metabolism.
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PMID:Effects of halothane anesthesia on the biodisposition of ketamine in rats. 126 10

Seven drugs administered im were evaluated to determine their efficacy in immobilizing captive agoutis. Ketamine HCl (63-83 mg/kg) and phencyclidine HCl (16.5-22.0 mg/kg) produced immobilization and analgesia. Phencyclidine administration was accompanied by numerous side effects and prolonged recovery. Xylazine HCl (3-70 mg/kg) and fentanyl-droperidol (0.28-1.11 ml/kg( produced varying degrees of ataxia and intermittent recumbency. Acetylpromazine, chlorpromazine, and promazine HCl were ineffective. Surgical anesthesia was successfully induced and maintained with halothane.
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PMID:An evaluation of sedatives and anesthetics in the agouti (Dasyprocta sp). 127 34

Fourteen adult budgerigars (Melopsittacus undulatus) were anesthetized with a combination of ketamine hydrochloride (40 mg/kg) and xylazine hydrochloride (10 mg/kg) intramuscularly. Forty-five minutes after ketamine-xylazine injection, one of four yohimbine hydrochloride doses (0.0, 0.11, 0.275, or 0.44 mg/kg, IM) was administered in a 0.7% saline vehicle. Latencies were recorded in minutes from yohimbine injection until subjects' behavior indicated three different points of recovery: 1) lifting the head, 2) standing unaided without ataxia, and 3) perching. Means for all three recovery point latencies were significantly reduced by 0.275 mg/kg of yohimbine compared with saline vehicle alone. Mean latencies among treatment groups for each of the three recovery points were not significantly different, other than control versus treated groups. Based on these results, we recommend a yohimbine dose of 0.275 mg/kg as an effective reversing agent for ketamine-xylazine anesthesia in budgerigars.
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PMID:Effects of yohimbine as a reversing agent for ketamine-xylazine anesthesia in budgerigars. 146 Aug 38

A combination of 0.5 mg/kg of methotrimeprazine, 0.1 mg/kg of midazolam and 100 mg/kg of a 10 per cent guaiphenesin solution was investigated for the induction of recumbency in 15 horses; the addition of 1.6 mg/kg of ketamine was also evaluated in 15 horses and anaesthesia was maintained with halothane in oxygen. The horses became recumbent quickly and smoothly and they recovered quietly, with little ataxia. Tachycardia occurred after induction, but no other changes from pre-operative values were observed until halothane in oxygen had been given, when hypothermia, hypotension, bradypnoea, hyperoxaemia, respiratory acidosis and decreased respiratory minute volume developed. Horses given ketamine in addition to methotrimeprazine, midazolam and guaiphenesin were easier to intubate and recovered more quickly than horses receiving only methotrimeprazine, midazolam and guaiphenesin.
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PMID:A combination of methotrimeprazine, midazolam and guaiphenesin, with and without ketamine, in an anaesthetic procedure for horses. 150 60

The effects of the dihydropyridine calcium antagonist, nitrendipine and the calcium channel activator, Bay K 8644, have been compared on the anaesthetic, ataxic and anticonvulsant effects of benzodiazepines. Possible interactions between the peripheral benzodiazepine receptor antagonist, PK11195, and the classical benzodiazepines were also examined. Nitrendipine considerably potentiated the anaesthetic effects of benzodiazepines and increased their ataxic effects but had no effect on the anticonvulsant actions. Clonazepam did not produce anaesthesia, at doses up to 1 g kg-1 or when given with nitrendipine. When given alone, nitrendipine did not cause general anaesthesia. Nitrendipine did not appear to alter the metabolism of midazolam. The calcium channel activator, Bay K 8644, reduced the anaesthetic potency of midazolam and, when given alone, produced ataxia. It did not significantly alter central concentrations of midazolam. The "peripheral" benzodiazepine antagonist, PK11195, did not affect the ataxic or anaesthetic actions of benzodiazepines. These results suggest that dihydropyridine-sensitive calcium channels may be more important to the general anaesthetic than to the anticonvulsant actions of benzodiazepines. The "peripheral" benzodiazepine site did not appear to play a role in either of these properties.
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PMID:Differential interactions between benzodiazepines and the dihydropyridines, nitrendipine and Bay K 8644. 171 26

Local and regional anesthetic techniques are useful tools for the equine practitioner. These techniques allow surgery to be performed without the risk and cost of general anesthesia. There are, however, risks associated with the local and regional techniques. Neurotoxicity, although rare, may occur when 200 mL or more of a local anesthetic are infiltrated in a short period of time to a 450-kg horse. More likely, horses may become ataxic after nerve blockade in the limbs. This ataxia may lead to self trauma because the horse may not know where the limbs are actually being placed. Although local and regional anesthesia may not always be easy to achieve, persistence and practice will result in consistent nerve blockade.
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PMID:Perineural and spinal anesthesia. 182 Feb 23

The objectives of this trial were to determine the ability of atipamezole, 4-aminopyridine and yohimbine to reverse the anaesthetic effects of a combination of medetomidine and ketamine in cats. Forty healthy cats were anaesthetised with 80 micrograms/kg medetomidine combined with 5 mg/kg ketamine. Thirty minutes later atipamezole (200 or 500 micrograms/kg), 4-aminopyridine (500 or 1000 micrograms/kg) or yohimbine (250 or 500 micrograms/kg) were injected intramuscularly. The doses of antagonists were randomised, so that each dose was administered to five cats, and 10 cats were injected only with physiological saline. Atipamezole clearly reversed the anaesthesia and bradycardia induced by medetomidine and ketamine. The mean (+/- sd) arousal times were 28 (+/- 4.7), 5.8 (+/- 1.8) and 7 (+/- 2.1) minutes in the placebo group, and the groups receiving 200 and 500 micrograms/kg atipamezole, respectively. The heart rates of the cats receiving 200 micrograms/kg atipamezole rapidly returned to values close to the initial ones, but 15 minutes after the injection of 500 micrograms/kg atipamezole a significant tachycardia was observed. All the cats showed moderate signs of ataxia during the recovery period. A dose of 500 micrograms/kg yohimbine also clearly reversed the anaesthetic effects of medetomidine/ketamine but 250 micrograms/kg was not effective. The dose of 500 micrograms/kg allowed a smooth recovery with no particular side effects except for some signs of incomplete antagonism of the ketamine effects, ie, ataxia and muscular incoordination. With 4-aminopyridine there were no statistically significant effects on the recovery, or the heart and respiratory rates of the cats anaesthetised with medetomidine/ketamine.
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PMID:Antagonistic activities of atipamezole, 4-aminopyridine and yohimbine against medetomidine/ketamine-induced anaesthesia in cats. 200 54


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