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Occurrence of only myoclonic jerks in juvenile myoclonic epilepsy
S Jain1, M V Padma, M C Maheshwari
1Department of Neurology, All India Institute of Medical Sciences, New Delhi, India.
Objectives:
The clinical data on individuals who were diagnosed to have juvenile myoclonic epilepsy (JME) on the basis of myoclonic jerks alone has been analysed. The points in favour and against individuals with only myoclonic jerks being classified as "affected" for research on JME are discussed.
Materials And Methods:
We studied 15 persons diagnosed with JME on the basis of only myoclonic jerks in a series of 161 patients with JME and their relatives. Detailed information on the seizure types in JME patients and their family members was collected. All affected individuals were examined by one person and had at least one conventional scalp EEG. CT/MRI of the brain was done as and when indicated.
Results:
Nine of these were probands while 6 were the relatives of JME patients. The EEG was abnormal in 8 of 9 probands and 1 of 6 relatives with only myoclonic jerks. All the 9 probands and 2 relatives with only myoclonic jerks were treated with anti-epileptic drugs. Three of the 4 relatives had spontaneous remission of jerks after variable intervals. Four of 15 persons with only myoclonic jerks had a first degree relative with definite JME.
Conclusions:
It appears that persons with myoclonic jerks alone may represent a benign subgroup of JME that may be genetically distinct from classic JME and the jerks may even spontaneously remit in a few cases. It is suggested that those persons with only myoclonic jerks and a first degree relationship with a definite diagnosis of JME can be classified as "affected" for inclusion into molecular studies, till molecular tools are available to settle the issue of phenotypic variations in hereditary neurological disorders like JME.
Insights
Individuals with juvenile myoclonic epilepsy (JME) presenting solely with myoclonic jerks may form a distinct, benign subgroup. These cases might even experience spontaneous remission, suggesting potential genetic differences from classic JME.
Area of Science:
- Neurology
- Genetics
- Epilepsy Research
Background:
- Juvenile myoclonic epilepsy (JME) is a common epilepsy syndrome.
- Diagnosis typically involves generalized tonic-clonic seizures and myoclonic jerks.
- Phenotypic variations in JME require further investigation.
Purpose of the Study:
- To analyze clinical data of individuals diagnosed with JME based solely on myoclonic jerks.
- To evaluate the suitability of including these individuals in JME research.
- To discuss factors supporting or refuting their classification as "affected" in JME studies.
Main Methods:
- Retrospective analysis of 15 individuals with JME presenting only with myoclonic jerks.
- Detailed collection of seizure types in patients and family members.
- Clinical examination, scalp EEG, and neuroimaging (CT/MRI) as indicated.
Main Results:
- Eight out of nine probands with myoclonic jerks alone showed abnormal EEGs.
- Two of six relatives with myoclonic jerks alone were treated with anti-epileptic drugs.
- Three of four relatives experienced spontaneous remission of myoclonic jerks.
Conclusions:
- Individuals with myoclonic jerks alone may represent a benign, potentially genetically distinct subgroup of JME.
- Spontaneous remission of jerks can occur in a subset of these individuals.
- Classification as "affected" for research is suggested for those with a first-degree relative with definite JME, pending molecular tools.