atonic seizure

(redirected from Atonic Seizures)


1. the sudden attack or recurrence of a disease.
2. a convulsion or attack of epilepsy.
absence seizure the seizure seen in petit mal epilepsy, marked by a momentary break in the stream of thought and activity, accompanied by a symmetrical spike and wave at 3 cycles per second on the electroencephalogram. Called also petit malseizure. See epilepsy.
atonic seizure an absence seizure characterized by sudden loss of muscle tone.
complex partial seizure see partial seizure.
febrile seizure febrile convulsion.
focal seizure partial seizure.
focal motor seizure a simple partial seizure consisting of clonus or spasm of a muscle or muscle group, occurring either singly or in a continuous repetitive series.
generalized tonic-clonic seizure (grand mal seizure) the seizure seen in grand mal epilepsy, marked by loss of consciousness and generalized tonic convulsions followed by clonic convulsions. See epilepsy.
jackknife s's infantile spasms.
myoclonic seizure one characterized by a brief episode of myoclonus.
partial seizure any seizure due to a lesion in a specific, known area of the cerebral cortex; symptoms vary with different lesion locations. A simple partial seizure is the most localized type, with a discharge that is predominantly one-sided or presents localized features without loss of consciousness. A complex partial seizure is associated with disease of the temporal lobe and characterized by varying degrees of impairment of consciousness. See epilepsy.
petit mal seizure absence seizure.
reflex seizure (sensory seizure) an epileptic seizure in response to a sensory stimulus, which may be tactile, visual, auditory, or musical.
simple partial seizure see partial seizure.
tonic-clonic seizure see generalized tonic-clonic seizure.

a·ton·ic sei·zure

a seizure characterized by sudden, brief (1-2 second) loss of muscle tone, involving postural muscles; the term usually applies to bilaterally synchronous events.
Synonym(s): akinetic seizure
References in periodicals archive ?
In Japan, the agent is approved as an adjunctive therapy to other AEDs in the treatment of tonic and atonic seizures associated with LGS when therapy with other AEDs is considered inadequate.
This status may be confused with atonic seizures or negative myoclonus (6).
atonic seizures (drop attacks) are ideal cases for corpus callosotomy, as this prevents generalisation to the contralateral cortex.
Although VNS results have shown minor complications, some patients continue to have atonic seizures, tonic and clonic seizures, even after treatment.
Atonic seizures are characterized by sudden loss of postural muscle tone lasting 1-2 seconds.
According to Devinksy, GLS patients also saw a very favorable response for atonic seizures, which is one of the most common types in that syndrome, with a median reduction of 71 percent.
One type, generalized seizures, includes generalized tonic-clonic seizures (formerly called "grand mal" seizures), tonic seizures, atonic seizures, or absence seizures (formerly called "petit mal" seizures).
A confirmed case was defined as a probable case with a documented nodding episode that was either observed and recorded by a trained health-care worker, videotaped, or documented with video electroencephalography or electromyography as atonic seizures (Table 1).
Simultaneous recording of 2 episodes by EEG, videography, electromyography, and electrocardiography documented that the nodding episodes are manifestations of atonic seizures.
The most common seizure types associated with LGS, tonic and atonic seizures, lead to the frequent falls due to sudden loss of consciousness.
generalised seizures including tonic, clonic, tonic-clonic, absence, myoclonic and atonic seizures and infantile spasms
But, most commonly, Tom suffers atonic seizures, where he just falls to the ground because every muscle in his body relaxes.