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Myoclonic Epilepsy of Infancy
Benign Myoclonic Epilepsy of Infancy

Presentation

Subsequently the patient presented with constantly raised IgA in serum and positive antinuclear and thyroid antimicrosomal antibodies. [ncbi.nlm.nih.gov]

They analyzed their clinical presentation, electroencephalographic findings, genetic (SCN1A gene) results, and treatment responses and compared the findings to previous reports. [scholars.northwestern.edu]

Entire Body System

  • Epilepsy

    Abstract Benign myoclonic epilepsy of infancy is recognized as a generalized and idiopathic epilepsy by the International League Against Epilepsy. Unprovoked and reflex seizures have been reported in these patients. [ncbi.nlm.nih.gov]

  • Crying

    It is sometimes preceded by a short cry, laugh or giggle. [pediatrics.aappublications.org]

    These may range from gagging, lip smacking, running, screaming, crying, or laughing. Your child may be tired or sleepy after the seizure. This is called the postictal period. [hopkinsmedicine.org]

    Vocalizations such as shouting, moaning, or crying are also common. ADNFLE is often misdiagnosed as nightmares. ADNFLE has a genetic basis[19]. These genes encode various nicotinic acetylcholine receptors. [house.wikia.com]

  • Inflammation

    With this kind of epilepsy half of the brain always has inflammation. This epilepsy is sometimes treated with a surgical procedure called hemispherectomy. [mychildwithoutlimits.org]

    The clinical and neurological examination was normal, except for upper airway inflammation. There were no signs of meningeal irritation. During the observation, the child was sitting with extended lower limbs. [movementdisorders.org]

  • Surgical Procedure

    This epilepsy is sometimes treated with a surgical procedure called hemispherectomy. [mychildwithoutlimits.org]

Psychiatrical

  • Visual Hallucination

    They may include strange sensations, visual hallucinations, emotional changes, muscle spasms, convulsions and other symptoms, depending on where in the brain the seizures begin. [mychildwithoutlimits.org]

Neurologic

  • Seizure

    KEYWORDS: Myoclonic epilepsy of infancy; Reflex myoclonic epilepsy of infancy; myoclonic seizures; reflex myoclonic seizures [ncbi.nlm.nih.gov]

  • Febrile Seizures

    In a series of 88 patients with BMEI, 26.1% had a history of simple febrile seizures. 3 There is a family history of epilepsy or febrile seizures in 50% or more of patients. [mhmedical.com]

  • Convulsions

    There is no prior personal history, although in some patients 1 or 2 isolated febrile convulsions may occur prior to the onset of myoclonias. A family history of epilepsy or febrile convulsions is present in 30% of cases. [ncbi.nlm.nih.gov]

    The seizures sometimes generalize (cause tonic/clonic convulsions). Affected children usually outgrow the disease by the end of adolescence. [medical-dictionary.thefreedictionary.com]

    Approximately a third of children with this condition have a family member who has epilepsy, or has had febrile convulsions as a young child. In most cases no cause is found for this type of epilepsy. [epilepsy.org.uk]

    G40 Epilepsy Excludes: Landau-Kleffner syndrome ( F80.3 ) seizure (convulsive) NOS ( R56.8 ) status epilepticus ( G41.- ) Todd's paralysis ( G83.8 ) G40.0 Localization-related (focal)(partial) idiopathic epilepsy and epileptic syndromes with seizures [apps.who.int]

  • Myoclonus

    Abstract Myoclonus is a brief, rapid, involuntary muscle jerk originating in the central nervous system that can be physiological or a symptom of disease. [ncbi.nlm.nih.gov]

    Alternatively, neurophysiological features associated with the neuroanatomical source of myoclonus can be used to differentiate cortical, cortical-subcortical, subcortical-nonsegmental, segmental, and peripheral myoclonus. [1] Febrile myoclonus (FM) was [movementdisorders.org]

    Patients with acoustic and somatosensory evoked myoclonus may not need treatment. [epilepsy.com]

  • Generalized Tonic-Clonic Seizure

    This phenotype comprised heterogeneous seizure types with nocturnal generalized tonic-clonic seizures predominating, mild to severe intellectual disability, and variable motor abnormalities. [ncbi.nlm.nih.gov]

    Seizures remit within 6 months to 5 years from onset but generalized tonic-clonic seizures may be seen in teenage years in 10-20% of patients. Patients with photosensitivity may have seizures that are more difficult to control. [epilepsydiagnosis.org]

    Multiple seizure types are present and generalized tonic-clonic seizures can be frequent. Ketogenic diet has been shown to be effective. [epilepsyfoundationmn.org]

    Prognosis Remission usually occurs within 1 year (6 months to 5 years) from onset. 10% to 20% develop infrequent generalized tonic-clonic seizures in their early teens. 10% to 20%, if untreated, may develop mild cognitive, behavioral, or motor deficits [epilepsy.com]

    The disease progress to generalized tonic-clonic seizures in about 40% of affected dogs. Treatment with antiepileptic drugs can bring improvement of symptoms. Heredity autosomal recessive Test duration 3-5 days after arrival of the sample in the lab [shop.labogen.com]

Workup

DEVELOPMENT: Patients with unclear etiologies after performing a brain magnetic resonance imaging should be considered for a further workup, which should include an evaluation for genetic defects. [ncbi.nlm.nih.gov]

EEG is required to distinguish myoclonic seizures from nonictal causes of myoclonus, which can arise from lesions of the cortex, brainstem, spinal cord, or even peripheral nerve (see Workup). [emedicine.medscape.com]

Diagnostic workup In early myoclonic encephalopathy, EEG is characterized by a "burst-suppression" pattern with bursts of spikes, sharp waves, and slow waves, which are irregularly intermingled and separated by periods of electrical silence. [intechopen.com]

EEG

  • Hypsarrhythmia

    Other terms currently in usage are "infantile spasms," "hypsarrhythmia" and "massive myoclonic seizures." 2. Myoclonic epilepsy of older children. [pediatrics.aappublications.org]

    In the vast majority, this pattern is hypsarrhythmia- a very chaotic looking EEG with high amplitude brain waves. The pattern is so distinct that it is generally hard to mistake for something else. [medhelp.org]

    Infants have epileptic (infantile) spasms, developmental regression around 4-6 months of age, and the EEG shows hypsarrhythmia pattern. [epilepsyfoundationmn.org]

    The origin of hypsarrhythmia and tonic spasms in West syndrome: evidence from a case of porencephaly and hydrocephalus with focal hypsarrhythmia. Brain Dev. 1999;21(2):129-31.Bruyere H, Lewis S, Wood S, MacLeod PJ, Langlois S. [malattierare.regione.veneto.it]

    The burst-suppression pattern usually evolves into atypical hypsarrhythmia or into multifocal paroxysms after 3 to 5 months of life. Erratic myoclonus does not generally have an ictal EEG counterpart. [intechopen.com]

  • Hypsarrhythmia

    Other terms currently in usage are "infantile spasms," "hypsarrhythmia" and "massive myoclonic seizures." 2. Myoclonic epilepsy of older children. [pediatrics.aappublications.org]

    In the vast majority, this pattern is hypsarrhythmia- a very chaotic looking EEG with high amplitude brain waves. The pattern is so distinct that it is generally hard to mistake for something else. [medhelp.org]

    Infants have epileptic (infantile) spasms, developmental regression around 4-6 months of age, and the EEG shows hypsarrhythmia pattern. [epilepsyfoundationmn.org]

    The origin of hypsarrhythmia and tonic spasms in West syndrome: evidence from a case of porencephaly and hydrocephalus with focal hypsarrhythmia. Brain Dev. 1999;21(2):129-31.Bruyere H, Lewis S, Wood S, MacLeod PJ, Langlois S. [malattierare.regione.veneto.it]

    The burst-suppression pattern usually evolves into atypical hypsarrhythmia or into multifocal paroxysms after 3 to 5 months of life. Erratic myoclonus does not generally have an ictal EEG counterpart. [intechopen.com]

  • Normal Interictal EEG

    EEG Background. The background EEG is normal. Interictal EEG. The interictal EEG is normal. Activation. [medlink.com]

     No specific EEG pattern, interictal background may be normal.  Spontaneous recovery with favorable outcome.  Can occur as late as 3.5 months and occur later in premature infants. 7. [slideshare.net]

    In infancy Diagnosis of “benign non-familial infantile convulsions” (two patients) was based on the characteristics of seizures without evidence of any triggering feature and with normal interictal EEG. [adc.bmj.com]

    This neurologic tenet is based on the fact that many children with seizures have normal interictal EEGs. In addition, the sensitivity of an interictal EEG for different seizure types is highly variable. [aafp.org]

Treatment

The best treatment combinations included topiramate, valproate, or the ketogenic diet. [scholars.northwestern.edu]

Rare grand mal seizures can occur during adolescence, after withdrawal of drug treatment. The psychomotor evolution is good if treatment is started early. [ncbi.nlm.nih.gov]

This test is for use in the diagnosis, prognosis, treatment and management of Dravet Syndrome. [currents.plos.org]

However, the treatment must be monitored using plasma-level assessments because an irregular intake can lead to a relapse and falsely mimic a drug-resistant epilepsy. Lin et al. ( 17 ) gave a very detailed study of the treatment in their patients. [neupsykey.com]

Prognosis

Abstract Severe myoclonic epilepsy of infancy (SMEI) is a recently identified seizure disorder with a uniformly poor prognosis. No successful therapy has been found for this disorder. [ncbi.nlm.nih.gov]

Etiology

Abstract Myoclonic epilepsies with onset in infancy and childhood are clinically and etiologically heterogeneous. Although genetic factors are thought to play an important role, to date very little is known about the etiology of these disorders. [ncbi.nlm.nih.gov]

Etiology Seizures associated with early myoclonic encephalopathy can be due to a number of etiologies. [emedicine.medscape.com]

Epidemiology

Friedman, CR, Neimann, J., Wegener, HC, and Tauxe, RV Epidemiology of Campylobacter jejuni infections in the United States and other industrialized nations. [books.google.es]

General Background Epidemiology According to the few available epidemiological data, BMEI seems to represent less than 1% of all the epilepsies (30 and unpublished data from the Centre Saint-Paul, 1999), 2% of all idiopathic generalized epilepsies (unpublished [neupsykey.com]

"Epidemiology of Severe Myoclonic Epilepsy of Infancy". Epilepsia. 31 (4): 397–400. doi : 10.1111/j.1528-1157.1990.tb05494.x. PMID 1695145. ^ Yakoub, M; Dulac, O; Jambaqué, I; Chiron, C; Plouin, P (September 1992). [en.wikipedia.org]

[Epidemiological and clinical study of West syndrome in Nagasaki Prefecture, Japan]. No To Hattatsu. 2001;33(1):15-20.Ormrod D, McClellan K. Topiramate: a review of its use in childhood epilepsy. [malattierare.regione.veneto.it]

Public Health Importance The estimated incidence of the disease in the UK population is difficult to ascertain as historically this group of epilepsy syndromes have been excluded from epidemiological studies as they have been difficult to diagnose in [currents.plos.org]

Pathophysiology

[…] a child diagnosed with benign myoclonic epilepsy of infancy, whose strictly unilateral and localized reflex myoclonias broaden the clinical spectrum of this idiopathic and generalized epileptic syndrome, and raise interrogations about its underlying pathophysiological [ncbi.nlm.nih.gov]

Pathophysiology Myoclonic seizures are generally the product of hypersynchronous, generalized cortical discharges. These discharges arise from hyperexcitable neuronal networks. [emedicine.medscape.com]

The author presents clinical and EEG manifestations, epidemiology, pathophysiology, differential diagnosis, and management of this rather benign early onset idiopathic myoclonic epilepsy. [medlink.com]

Pathophysiology The underlying mechanisms of these disorders are still poorly understood. [intechopen.com]

Prevention

Valproate is used as a first-line agent to prevent the recurrence of febrile seizures and oral/nasal/rectal benzodiazepine is used for any long-lasting seizures. [radiopaedia.org]

Am J Epidemiol, 1996 Vol. 143, No. 11, 1165-1172 Barlow WE, Davis RL, Glasser JW, Rhodes PH, Thompson RS, Mulloly JP, Black SB, Shinefield HR, Ward JI, Marcy SM, DeStefano F and Chen RT, for the Centers for Disease Control and Prevention Vaccine Safety [assis.it]

Treatment Therapy is available for the prevention and control of recurrent seizures. [medical-dictionary.thefreedictionary.com]

In addition, parents should also be aware that these drugs may prevent recurrences but do not alter the long-term prognosis for attaining seizure remission. [aafp.org]

Successful treatment with adrenocorticotropic hormone (ACTH) or vigabatrin can prevent further developmental regression. Many children develop other seizure types and go on to have Lennox-Gastaut syndrome (see information below). Dravet syndrome. [epilepsyfoundationmn.org]

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