seizure threshold


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Related to seizure threshold: ataxia

seizure threshold

the amount of stimulus necessary to produce a convulsive seizure. All humans can have seizures if the provocation is sufficient.

seizure threshold

The level of neurological stimulation capable of precipitating a seizure.
See also: threshold

seizure

1. the sudden attack or recurrence of a disease.
2. a convulsion or attack of epilepsy.

audiogenic seizure
a seizure brought on by sound.
cerebral seizure
an attack of epilepsy.
epileptiform seizure
focal seizure
see partial seizure (below).
generalized seizure
see grand mal seizure (below).
grand mal seizure
one with no localizing signs. After a brief period of restlessness, there is unconsciousness, generalized muscular activity, excessive salivation, chewing activity, opisthotonos, running movements, and often urination and defecation. The most common type of seizure in dogs and cats.
Jacksonian seizure
partial seizure
one restricted to a focus in the brain; signs correspond to the area affected, e.g. motor activity of an isolated area or limb, hallucinations such as fly catching, apparent blindness, behavioral abnormalities, etc. Called also focal seizures.
petit mal seizure
a mild, very brief generalized seizure. See also petit mal.
photogenic seizure
a seizure brought on by light.
psychomotor seizure
motor seizures accompanied by a psychic stage. There are hallucinations, salivation, pupillary dilatation, mastication, fecal and urinary excretion, and wild running. Seen in dogs with lesions in the pyriform lobe or hippocampus and from poisoning with agenized flour (canine hysteria). Called also running fits.
tetanic seizure
see tetany.
seizure threshold
the level of stimulation at which a seizure is precipitated.
tonic seizure
one in which the muscles are rigid.
tonic-clonic seizure
alternating tonic (rigid muscles) and clonic (jerking of muscles) phases; a grand mal seizure.
References in periodicals archive ?
Though barbiturates increase seizure threshold and decrease seizure duration, among barbiturates, methohexital appears to have the least impact on these factors.
However, in many cases seizure threshold does not appear to change until more than a week after ketosis develops.
Ketamine reportedly increases the duration of electrically induced seizures and has thus been recommended for patients with an increased seizure threshold (36).
Cowan A, Geller EB, Adler MW (1979) Classification of opioids on the basis of change in seizure threshold in rats.
Cyclosporine lowers seizure threshold in an experimental model of electroshock-induced seizures in Munich-Wistar rats.
2,5,8,9] They may also increase the seizure threshold of epileptigenic foci.
Changes in cerebral blood flow appear to influence ECT's anticonvulsant action, says Sackeim; reductions in neurotransmitter metabolism and increases in seizure threshold over the course of treatment probably also spur the acticonvulsant process.
Concomitant use with medicinal products that reduce the seizure threshold (e.
I t appears likely that sevoflurane had triggered seizure activity in the apparently controlled focus The potential for sevoflurane to induce epileptogenic activity in patients with reduced seizure threshold is discussed.
This concern was valid because an earlier generation of antidepressants--the tricyclics--are known to lower the seizure threshold.
Ethanol should be avoided, as it may lower the seizure threshold.