Short-term cortical plasticity in patients with dystonia : A study with repetitive transcranial magnetic stimulation
Identifieur interne : 001592 ( PascalFrancis/Corpus ); précédent : 001591; suivant : 001593Short-term cortical plasticity in patients with dystonia : A study with repetitive transcranial magnetic stimulation
Auteurs : Francesca Gilio ; Antonio Suppa ; Matteo Bologna ; Cinzia Lorenzano ; Giovanni Fabbrini ; Alfredo BerardelliSource :
- Movement disorders [ 0885-3185 ] ; 2007.
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English descriptors
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Abstract
Repetitive transcranial magnetic stimulation (rTMS) delivered at 5 Hz frequency and suprathreshold (RMT) intensity produces a progressive facilitation of motor-evoked potential (MEP) amplitude that outlasts the end of stimulation. This phenomenon is related to a short-term enhancement of cortical excitatory interneurones. In this study, we investigated whether 5 Hz-rTMS elicits similar MEP facilitation during stimulation and similar facilitatory after-effects in patients with upper limb dystonia and healthy subjects. Trains of 5, 10, and 20 stimuli were delivered at 120% RMT over the primary motor cortex with the subjects at rest. rTMS-trains were followed by single test stimuli delivered at various interstimulus intervals (0.5-10 s) at 120% RMT using a conditioning-test paradigm. Single conditioning stimuli were also delivered. The effects of suprathreshold 1 Hz-rTMS were also tested. The MEP amplitude during the course of the trains and of the test stimuli was measured. In control experiments, we investigated the role of the afferent inputs elicited by muscle twitches after ulnar nerve stimulation on the MEP amplitude. In patients and healthy subjects, MEP amplitude increased significantly during the course of 5 Hz-trains. In both groups the MEP facilitation outlasted the end of 5 Hz-rTMS, however the facilitatory after-effects were more pronounced and lasted longer in patients than in healthy subjects. MEP amplitudes during and after 1 Hz-rTMS remained unchanged. Ulnar nerve stimulation did not change the test MEP amplitude. We conclude that in patients with upper limb dystonia there is an abnormal recovery from MEP facilitation after suprathreshold 5 Hz-rTMS suggesting an abnormal pattern of short-term cortical plasticity.
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Format Inist (serveur)
NO : | PASCAL 07-0393264 INIST |
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ET : | Short-term cortical plasticity in patients with dystonia : A study with repetitive transcranial magnetic stimulation |
AU : | GILIO (Francesca); SUPPA (Antonio); BOLOGNA (Matteo); LORENZANO (Cinzia); FABBRINI (Giovanni); BERARDELLI (Alfredo) |
AF : | Department of Neurological Sciences and Neuromed Institute (IRCCS), University of Rome "La Sapienza"/Rome/Italie (1 aut., 2 aut., 3 aut., 4 aut., 5 aut., 6 aut.) |
DT : | Publication en série; Niveau analytique |
SO : | Movement disorders; ISSN 0885-3185; Etats-Unis; Da. 2007; Vol. 22; No. 10; Pp. 1436-1443; Bibl. 33 ref. |
LA : | Anglais |
EA : | Repetitive transcranial magnetic stimulation (rTMS) delivered at 5 Hz frequency and suprathreshold (RMT) intensity produces a progressive facilitation of motor-evoked potential (MEP) amplitude that outlasts the end of stimulation. This phenomenon is related to a short-term enhancement of cortical excitatory interneurones. In this study, we investigated whether 5 Hz-rTMS elicits similar MEP facilitation during stimulation and similar facilitatory after-effects in patients with upper limb dystonia and healthy subjects. Trains of 5, 10, and 20 stimuli were delivered at 120% RMT over the primary motor cortex with the subjects at rest. rTMS-trains were followed by single test stimuli delivered at various interstimulus intervals (0.5-10 s) at 120% RMT using a conditioning-test paradigm. Single conditioning stimuli were also delivered. The effects of suprathreshold 1 Hz-rTMS were also tested. The MEP amplitude during the course of the trains and of the test stimuli was measured. In control experiments, we investigated the role of the afferent inputs elicited by muscle twitches after ulnar nerve stimulation on the MEP amplitude. In patients and healthy subjects, MEP amplitude increased significantly during the course of 5 Hz-trains. In both groups the MEP facilitation outlasted the end of 5 Hz-rTMS, however the facilitatory after-effects were more pronounced and lasted longer in patients than in healthy subjects. MEP amplitudes during and after 1 Hz-rTMS remained unchanged. Ulnar nerve stimulation did not change the test MEP amplitude. We conclude that in patients with upper limb dystonia there is an abnormal recovery from MEP facilitation after suprathreshold 5 Hz-rTMS suggesting an abnormal pattern of short-term cortical plasticity. |
CC : | 002B17; 002B17H; 002B17F |
FD : | Système nerveux pathologie; Dystonie; Court terme; Plasticité; Homme; Stimulus répétitif; Potentiel évoqué moteur; Stimulation magnétique transcrânienne |
FG : | Extrapyramidal syndrome; Mouvement involontaire; Muscle strié pathologie; Trouble neurologique; Electrophysiologie; Encéphale pathologie; Système nerveux central pathologie |
ED : | Nervous system diseases; Dystonia; Short term; Plasticity; Human; Repetitive stimulus; Motor evoked potential; Transcranial magnetic stimulation |
EG : | Extrapyramidal syndrome; Involuntary movement; Striated muscle disease; Neurological disorder; Electrophysiology; Cerebral disorder; Central nervous system disease |
SD : | Sistema nervioso patología; Distonía; Corto plazo; Plasticidad; Hombre; Estímulo repetitivo; Potencial evocado motor |
LO : | INIST-20953.354000161473330100 |
ID : | 07-0393264 |
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Pascal:07-0393264Le document en format XML
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<front><div type="abstract" xml:lang="en">Repetitive transcranial magnetic stimulation (rTMS) delivered at 5 Hz frequency and suprathreshold (RMT) intensity produces a progressive facilitation of motor-evoked potential (MEP) amplitude that outlasts the end of stimulation. This phenomenon is related to a short-term enhancement of cortical excitatory interneurones. In this study, we investigated whether 5 Hz-rTMS elicits similar MEP facilitation during stimulation and similar facilitatory after-effects in patients with upper limb dystonia and healthy subjects. Trains of 5, 10, and 20 stimuli were delivered at 120% RMT over the primary motor cortex with the subjects at rest. rTMS-trains were followed by single test stimuli delivered at various interstimulus intervals (0.5-10 s) at 120% RMT using a conditioning-test paradigm. Single conditioning stimuli were also delivered. The effects of suprathreshold 1 Hz-rTMS were also tested. The MEP amplitude during the course of the trains and of the test stimuli was measured. In control experiments, we investigated the role of the afferent inputs elicited by muscle twitches after ulnar nerve stimulation on the MEP amplitude. In patients and healthy subjects, MEP amplitude increased significantly during the course of 5 Hz-trains. In both groups the MEP facilitation outlasted the end of 5 Hz-rTMS, however the facilitatory after-effects were more pronounced and lasted longer in patients than in healthy subjects. MEP amplitudes during and after 1 Hz-rTMS remained unchanged. Ulnar nerve stimulation did not change the test MEP amplitude. We conclude that in patients with upper limb dystonia there is an abnormal recovery from MEP facilitation after suprathreshold 5 Hz-rTMS suggesting an abnormal pattern of short-term cortical plasticity.</div>
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<s5>39</s5>
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<s5>40</s5>
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<s5>40</s5>
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<s5>41</s5>
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<s5>41</s5>
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<s5>42</s5>
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<s5>42</s5>
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<s5>43</s5>
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<s5>43</s5>
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<server><NO>PASCAL 07-0393264 INIST</NO>
<ET>Short-term cortical plasticity in patients with dystonia : A study with repetitive transcranial magnetic stimulation</ET>
<AU>GILIO (Francesca); SUPPA (Antonio); BOLOGNA (Matteo); LORENZANO (Cinzia); FABBRINI (Giovanni); BERARDELLI (Alfredo)</AU>
<AF>Department of Neurological Sciences and Neuromed Institute (IRCCS), University of Rome "La Sapienza"/Rome/Italie (1 aut., 2 aut., 3 aut., 4 aut., 5 aut., 6 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Movement disorders; ISSN 0885-3185; Etats-Unis; Da. 2007; Vol. 22; No. 10; Pp. 1436-1443; Bibl. 33 ref.</SO>
<LA>Anglais</LA>
<EA>Repetitive transcranial magnetic stimulation (rTMS) delivered at 5 Hz frequency and suprathreshold (RMT) intensity produces a progressive facilitation of motor-evoked potential (MEP) amplitude that outlasts the end of stimulation. This phenomenon is related to a short-term enhancement of cortical excitatory interneurones. In this study, we investigated whether 5 Hz-rTMS elicits similar MEP facilitation during stimulation and similar facilitatory after-effects in patients with upper limb dystonia and healthy subjects. Trains of 5, 10, and 20 stimuli were delivered at 120% RMT over the primary motor cortex with the subjects at rest. rTMS-trains were followed by single test stimuli delivered at various interstimulus intervals (0.5-10 s) at 120% RMT using a conditioning-test paradigm. Single conditioning stimuli were also delivered. The effects of suprathreshold 1 Hz-rTMS were also tested. The MEP amplitude during the course of the trains and of the test stimuli was measured. In control experiments, we investigated the role of the afferent inputs elicited by muscle twitches after ulnar nerve stimulation on the MEP amplitude. In patients and healthy subjects, MEP amplitude increased significantly during the course of 5 Hz-trains. In both groups the MEP facilitation outlasted the end of 5 Hz-rTMS, however the facilitatory after-effects were more pronounced and lasted longer in patients than in healthy subjects. MEP amplitudes during and after 1 Hz-rTMS remained unchanged. Ulnar nerve stimulation did not change the test MEP amplitude. We conclude that in patients with upper limb dystonia there is an abnormal recovery from MEP facilitation after suprathreshold 5 Hz-rTMS suggesting an abnormal pattern of short-term cortical plasticity.</EA>
<CC>002B17; 002B17H; 002B17F</CC>
<FD>Système nerveux pathologie; Dystonie; Court terme; Plasticité; Homme; Stimulus répétitif; Potentiel évoqué moteur; Stimulation magnétique transcrânienne</FD>
<FG>Extrapyramidal syndrome; Mouvement involontaire; Muscle strié pathologie; Trouble neurologique; Electrophysiologie; Encéphale pathologie; Système nerveux central pathologie</FG>
<ED>Nervous system diseases; Dystonia; Short term; Plasticity; Human; Repetitive stimulus; Motor evoked potential; Transcranial magnetic stimulation</ED>
<EG>Extrapyramidal syndrome; Involuntary movement; Striated muscle disease; Neurological disorder; Electrophysiology; Cerebral disorder; Central nervous system disease</EG>
<SD>Sistema nervioso patología; Distonía; Corto plazo; Plasticidad; Hombre; Estímulo repetitivo; Potencial evocado motor</SD>
<LO>INIST-20953.354000161473330100</LO>
<ID>07-0393264</ID>
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