Lack of differences of motorcortical excitability in the morning as compared to the evening in juvenile myoclonic epilepsy—A study using transcranial magnetic stimulation

We used transcranial magnetic stimulation (TMS) in patients with juvenile myoclonic epilepsy (JME) and healthy controls to characterise motorcortical excitability in the morning as compared to the evening. Intra- and interindividual comparisons in JME-patients and controls showed no significant differences of any TMS parameter. The expected rise of the resting motor thresholds (RMT) in JME-patients taking anticonvulsants could not be detected which may indicate a decreased RMT in JME-patients.

[1]  U. Ziemann,et al.  Methylphenidate facilitates and disinhibits the motor cortex in intact humans , 2003, Neuroreport.

[2]  Janine Reis,et al.  Topiramate Selectively Decreases Intracortical Excitability in Human Motor Cortex , 2002, Epilepsia.

[3]  W. Oertel,et al.  Motor cortex excitability in focal epilepsies not including the primary motor area--a TMS study. , 2005, Brain : a journal of neurology.

[4]  Joong Koo Kang,et al.  Correlation of interictal spike-wave with thalamic glucose metabolism in juvenile myoclonic epilepsy , 2005, Neuroreport.

[5]  John W. Miller,et al.  The central medial nucleus: thalamic site of seizure regulation , 1990, Brain Research.

[6]  Paolo Manganotti,et al.  Motor Responses to Afferent Stimulation in Juvenile Myoclonic Epilepsy , 2004, Epilepsia.

[7]  M A Rogawski,et al.  Generalized Epileptic Disorders: An Update , 2001, Epilepsia.

[8]  Fernando Cendes,et al.  Thalamic Dysfunction in Juvenile Myoclonic Epilepsy: A Proton MRS Study , 2003, Epilepsia.

[9]  J. Huguenard Block of T-Type Ca2+ Channels Is an Important Action of Succinimide Antiabsence Drugs , 2002, Epilepsy currents.

[10]  C. Marsden,et al.  Corticocortical inhibition in human motor cortex. , 1993, The Journal of physiology.

[11]  W. Fischer,et al.  Riluzole suppresses motor cortex facilitation in correlation to its plasma level , 2000, Experimental Brain Research.

[12]  H. Lüders,et al.  Juvenile Myoclonic Epilepsy , 1987 .

[13]  H. Lüders,et al.  Epilepsy: Electroclinical Syndromes , 1987, Clinical Medicine and the Nervous System.

[14]  G Zanette,et al.  Early and Late Intracortical Inhibition in Juvenile Myoclonic Epilepsy , 2000, Epilepsia.

[15]  K. R. Mills,et al.  Silent period to transcranial magnetic stimulation: construction and properties of stimulus–response curves in healthy volunteers , 2005, Experimental Brain Research.

[16]  D C Reutens,et al.  Magnetic stimulation of the brain in generalized epilepsy: Reversal of cortical hyperexcitability by anticonvulsants , 1993, Annals of neurology.

[17]  W. Oertel,et al.  Levetiracetam influences human motor cortex excitability mainly by modulation of ion channel function—a TMS study , 2004, Epilepsy Research.

[18]  G. Avanzini,et al.  Cortical myoclonus in Janz syndrome , 2001, Clinical Neurophysiology.

[19]  A. Oliviero,et al.  Effects of lorazepam on short latency afferent inhibition and short latency intracortical inhibition in humans , 2005, The Journal of physiology.

[20]  C Iani,et al.  Distinguishing forms of generalized epilepsy using magnetic brain stimulation. , 1996, Electroencephalography and clinical neurophysiology.

[21]  B. Steinhoff,et al.  Effects of antiepileptic drugs on motor cortex excitability in humans: A transcranial magnetic stimulation study , 1996, Annals of neurology.