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morphine/ataque epiléptico
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Blockade of morphine-induced hindlimb myoclonic seizures in mice by ketamine.
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Morphine administration can lead to a variety of side-effects, including myoclonus. In an animal model, high morphine doses given intrathecally elicit hindlimb myoclonic seizures which are not influenced by traditional opioid receptor antagonists, such as naloxone. Ketamine prevents this
[Involvement of endogenous histamine in modulatory effect of morphine on seizure susceptibility in mice].
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OBJECTIVE
To investigate the modulatory effects of morphine on the susceptibility to pentylenetetrazole-induced seizures, and the involvement of endogenous histamine in this process.
METHODS
Both the wild-type (WT) mice and histidine decarboxylase (a key enzyme for histamine biosynthesis) deficient
Inhibition of clonic seizure-like excitatory effects induced by intrathecal morphine using two NMDA receptor antagonists: MK-801 and ACEA-1011.
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Microinjection of high doses of morphine into the spinal lumbar intrathecal (i.t.) space of mice produces dose-dependent clonic seizure-like excitatory effects. Naloxone, an opioid antagonist (10 mg/kg, i.p.), injected 5 min prior to i.t. morphine, did not reverse the seizure-like motor effects,
The role of 5-HT(3) receptors in the additive anticonvulsant effects of citalopram and morphine on pentylenetetrazole-induced clonic seizures in mice.
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Citalopram, a selective serotonin reuptake inhibitor (SSRI), is frequently used in the treatment of major depressive disorders. In addition to its antidepressant features, citalopram shows some anticonvulsive properties at lower doses, whereas higher doses, ingested in cases of suicide, have been
The interaction of adenosine and morphine on pentylenetetrazole-induced seizure threshold in mice.
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Adenosine agonists or low doses of morphine exert anti-convulsant effects in different models of seizures. On the other hand, a tight interaction has been reported between morphine and adenosine in various paradigms. This study investigated the effect of the interaction of adenosine and morphine on
Prenatal morphine exposure alters ovarian steroid hormonal regulation of seizure susceptibility.
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The present study examined the ovarian hormonal regulation of seizure susceptibility in prenatally morphine- and saline-exposed adult female rats in the flurothyl seizure model in vivo, and in low-magnesium-induced epileptiform activity in brain slices, in vitro. All females were
Mediation of nitric oxide in inhibitory effect of morphine against electroshock-induced convulsions in mice.
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Nitric oxide (NO) and morphine have been coupled in many physiological as well as pathological processes. The present study examined the involvement of the L-arginine/NO pathway in the anticonvulsant properties of systemic morphine (2-30 mg/kg) against electroshock seizures (ECS) in mice. Morphine
Lithium inhibits the modulatory effects of morphine on susceptibility to pentylenetetrazole-induced clonic seizure in mice: involvement of a nitric oxide pathway.
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Lithium has been reported to inhibit opioid-induced properties. The present study examined the effect of acute and chronic administration of lithium chloride (LiCl) on morphine's biphasic modulation of susceptibility to pentylenetetrazole (PTZ)-induced clonic seizure in mice. We also examined the
The long-term effects of neonatal morphine administration on the pentylenetetrazol seizure model in rats: the role of hippocampal cholinergic receptors in adulthood.
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Early life exposure to opiates may affect neuropathological conditions, such as epilepsy, during adulthood. We investigated whether neonatal morphine exposure affects pentylenetetrazol (PTZ)-induced seizures in adulthood. Male rats were subcutaneously injected with morphine or saline on postnatal
Role of ATP-sensitive potassium channels in the biphasic effects of morphine on pentylenetetrazole-induced seizure threshold in mice.
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Although several studies have indicated that the opioid receptor agonist morphine exerts biphasic effects on clonic seizure threshold, as yet little is known of the underlying mechanisms in this effect. In the present study, using the specific ATP-sensitive K(+) (K(ATP)) channel blocker
Morphine modulates the effects of histamine H1 and H3 receptors on seizure susceptibility in pentylenetetrazole-induced seizure model of mice.
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Histamine regulates release of neurotransmitters such as dopamine, serotonin, gamma-aminobutyric acid (GABA), glutamate and also is involved in several functions in central nervous system (CNS). It has been shown that histamine participates in disorders like seizure. It has been well documented that
Opiate and non-opiate aspects of morphine induced seizures.
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The intraperitoneal administration of morphine hydrochloride at doses of 300 mg/kg produced analgesia, catalepsy, and electrographic spiking in rats that developed into electrographic seizure patterns after approximately 2.5 h. Whereas naltrexone (12 mg/kg) reversed analgesia and catalepsy, and
Effect of morphine pretreatment on pentylenetetrazol-induced seizures in the rat.
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In several species, larger doses of systemically-administered morphine induce seizures while smaller doses potentiate chemically-induced convulsions. However, it is generally considered that morphine acts as an anticonvulsant in the rat. In the present study, the effects of pretreatment with
Systemic morphine blocks the seizures induced by intracerebroventricular (i.c.v.) injections of opiates and opioid peptides.
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Intracerebroventricular (i.c.v.) injections of the endorphins and of morphine in rats produce highly characteristic, naloxone sensitive, electrographic seizures. In contrast, systemic injections of morphine have been shown to exert a marked anticonvulsant effect. The present study demonstrates that
Seizures associated with high-dose intravenous morphine containing sodium bisulfite preservative.
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OBJECTIVE
To report a case of seizures occurring during administration of high-dose intravenous morphine containing sodium bisulfite as a preservative.
METHODS
A 56-year-old woman hospitalized with multiple myeloma developed myoclonic and tonic-clonic seizures following administration of intravenous
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