Neurophysiological investigations in patients with head tremor.
Identifieur interne : 004635 ( PubMed/Curation ); précédent : 004634; suivant : 004636Neurophysiological investigations in patients with head tremor.
Auteurs : J. Valls-Solé [Espagne] ; E S Tolosa ; F. Nobbe ; E. Diéguez ; E. Mu Oz ; P. Sanz ; F. ValldeoriolaSource :
- Movement disorders : official journal of the Movement Disorder Society [ 0885-3185 ] ; 1997.
English descriptors
- KwdEn :
- Adult, Aged, Aged, 80 and over, Blinking (physiology), Brain Stem (physiopathology), Case-Control Studies, Dystonia (complications), Dystonia (diagnosis), Dystonia (physiopathology), Electromyography, Female, Hand (physiopathology), Head Movements (physiology), Humans, Jaw (physiopathology), Male, Middle Aged, Muscle, Skeletal (physiopathology), Neck (physiopathology), Neural Conduction (physiology), Reflex, Abnormal (physiology), Torticollis (complications), Tremor (classification), Tremor (etiology), Tremor (physiopathology).
- MESH :
- classification : Tremor.
- complications : Dystonia, Torticollis.
- diagnosis : Dystonia.
- etiology : Tremor.
- physiology : Blinking, Head Movements, Neural Conduction, Reflex, Abnormal.
- physiopathology : Brain Stem, Dystonia, Hand, Jaw, Muscle, Skeletal, Neck, Tremor.
- Adult, Aged, Aged, 80 and over, Case-Control Studies, Electromyography, Female, Humans, Male, Middle Aged.
Abstract
We studied 30 patients whose primary complaint was head tremor in an attempt to characterize neurophysiological aspects of their abnormal movement. Based on family medical history and physical examination, 23 patients had definite or probable essential tremor (essential head tremor, EHT). The remaining seven had mild dystonic signs accompanying their head tremor (head tremor plus dystonic signs, HT + DS). We recorded head movement and the electromyographic (EMG) activity of the sternomastoid and splenius capitis muscles, determined the spontaneous blinking rate, and measured the excitability recovery curve of the blink reflex and of the masseteric inhibitory reflex. All patients had tremor bursts at a frequency ranging between 3 and 9 Hz in at least one of the muscles examined. The predominant pattern seen when patients were sitting relaxed and facing forward was that of synchronized EMG bursts in both splenius capitis muscles. Maintenance of extreme head postures demonstrated two types of additional abnormalities: type 1 (enhancement of tremor), which was observed in 11 patients (47.8%) with EHT and in two (28.5%) with HT + DS; and type 2 (activation of neck muscles not required for maintenance of the posture), which was observed in two patients (8.7%) with EHT and in five (71.5%) with HT + DS (chi 2 = 26.4; p < 0.001). Mean blinking rate per minute was 24.9 +/- 14.6 in patients with EHT and 42.3 +/- 10.5 in patients with HT + DS (paired t test, p = 0.001). The blink reflex and masseteric inhibitory reflex excitability recovery curves showed an abnormal interneuronal excitability enhancement in seven (30.4%) of the 23 patients with EHT and in two (28.5%) of the seven with HT + DS (chi 2 = 3.1; p > 0.05). Abnormal patterns of EMG activity of the neck muscles correlated well with the presence of mild dystonic signs. However, the analysis of brainstem interneuronal excitability did not enable recognition of those patients with head tremor who could potentially develop cervical dystonia. The enhancement of brainstem interneuronal excitability found in approximately 30% of patients with head tremor could be related to plastic changes triggered by increased activity of the cranial muscles.
DOI: 10.1002/mds.870120415
PubMed: 9251077
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<author><name sortKey="Valls Sole, J" sort="Valls Sole, J" uniqKey="Valls Sole J" first="J" last="Valls-Solé">J. Valls-Solé</name>
<affiliation wicri:level="1"><nlm:affiliation>Neurology Department, Hospital Clinic, University of Barcelona, Spain.</nlm:affiliation>
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<author><name sortKey="Tolosa, E S" sort="Tolosa, E S" uniqKey="Tolosa E" first="E S" last="Tolosa">E S Tolosa</name>
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<author><name sortKey="Nobbe, F" sort="Nobbe, F" uniqKey="Nobbe F" first="F" last="Nobbe">F. Nobbe</name>
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<author><name sortKey="Dieguez, E" sort="Dieguez, E" uniqKey="Dieguez E" first="E" last="Diéguez">E. Diéguez</name>
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<author><name sortKey="Sanz, P" sort="Sanz, P" uniqKey="Sanz P" first="P" last="Sanz">P. Sanz</name>
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<author><name sortKey="Valldeoriola, F" sort="Valldeoriola, F" uniqKey="Valldeoriola F" first="F" last="Valldeoriola">F. Valldeoriola</name>
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<term>Aged</term>
<term>Aged, 80 and over</term>
<term>Blinking (physiology)</term>
<term>Brain Stem (physiopathology)</term>
<term>Case-Control Studies</term>
<term>Dystonia (complications)</term>
<term>Dystonia (diagnosis)</term>
<term>Dystonia (physiopathology)</term>
<term>Electromyography</term>
<term>Female</term>
<term>Hand (physiopathology)</term>
<term>Head Movements (physiology)</term>
<term>Humans</term>
<term>Jaw (physiopathology)</term>
<term>Male</term>
<term>Middle Aged</term>
<term>Muscle, Skeletal (physiopathology)</term>
<term>Neck (physiopathology)</term>
<term>Neural Conduction (physiology)</term>
<term>Reflex, Abnormal (physiology)</term>
<term>Torticollis (complications)</term>
<term>Tremor (classification)</term>
<term>Tremor (etiology)</term>
<term>Tremor (physiopathology)</term>
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<term>Dystonia</term>
<term>Hand</term>
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<term>Aged, 80 and over</term>
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<term>Female</term>
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<front><div type="abstract" xml:lang="en">We studied 30 patients whose primary complaint was head tremor in an attempt to characterize neurophysiological aspects of their abnormal movement. Based on family medical history and physical examination, 23 patients had definite or probable essential tremor (essential head tremor, EHT). The remaining seven had mild dystonic signs accompanying their head tremor (head tremor plus dystonic signs, HT + DS). We recorded head movement and the electromyographic (EMG) activity of the sternomastoid and splenius capitis muscles, determined the spontaneous blinking rate, and measured the excitability recovery curve of the blink reflex and of the masseteric inhibitory reflex. All patients had tremor bursts at a frequency ranging between 3 and 9 Hz in at least one of the muscles examined. The predominant pattern seen when patients were sitting relaxed and facing forward was that of synchronized EMG bursts in both splenius capitis muscles. Maintenance of extreme head postures demonstrated two types of additional abnormalities: type 1 (enhancement of tremor), which was observed in 11 patients (47.8%) with EHT and in two (28.5%) with HT + DS; and type 2 (activation of neck muscles not required for maintenance of the posture), which was observed in two patients (8.7%) with EHT and in five (71.5%) with HT + DS (chi 2 = 26.4; p < 0.001). Mean blinking rate per minute was 24.9 +/- 14.6 in patients with EHT and 42.3 +/- 10.5 in patients with HT + DS (paired t test, p = 0.001). The blink reflex and masseteric inhibitory reflex excitability recovery curves showed an abnormal interneuronal excitability enhancement in seven (30.4%) of the 23 patients with EHT and in two (28.5%) of the seven with HT + DS (chi 2 = 3.1; p > 0.05). Abnormal patterns of EMG activity of the neck muscles correlated well with the presence of mild dystonic signs. However, the analysis of brainstem interneuronal excitability did not enable recognition of those patients with head tremor who could potentially develop cervical dystonia. The enhancement of brainstem interneuronal excitability found in approximately 30% of patients with head tremor could be related to plastic changes triggered by increased activity of the cranial muscles.</div>
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<Abstract><AbstractText>We studied 30 patients whose primary complaint was head tremor in an attempt to characterize neurophysiological aspects of their abnormal movement. Based on family medical history and physical examination, 23 patients had definite or probable essential tremor (essential head tremor, EHT). The remaining seven had mild dystonic signs accompanying their head tremor (head tremor plus dystonic signs, HT + DS). We recorded head movement and the electromyographic (EMG) activity of the sternomastoid and splenius capitis muscles, determined the spontaneous blinking rate, and measured the excitability recovery curve of the blink reflex and of the masseteric inhibitory reflex. All patients had tremor bursts at a frequency ranging between 3 and 9 Hz in at least one of the muscles examined. The predominant pattern seen when patients were sitting relaxed and facing forward was that of synchronized EMG bursts in both splenius capitis muscles. Maintenance of extreme head postures demonstrated two types of additional abnormalities: type 1 (enhancement of tremor), which was observed in 11 patients (47.8%) with EHT and in two (28.5%) with HT + DS; and type 2 (activation of neck muscles not required for maintenance of the posture), which was observed in two patients (8.7%) with EHT and in five (71.5%) with HT + DS (chi 2 = 26.4; p < 0.001). Mean blinking rate per minute was 24.9 +/- 14.6 in patients with EHT and 42.3 +/- 10.5 in patients with HT + DS (paired t test, p = 0.001). The blink reflex and masseteric inhibitory reflex excitability recovery curves showed an abnormal interneuronal excitability enhancement in seven (30.4%) of the 23 patients with EHT and in two (28.5%) of the seven with HT + DS (chi 2 = 3.1; p > 0.05). Abnormal patterns of EMG activity of the neck muscles correlated well with the presence of mild dystonic signs. However, the analysis of brainstem interneuronal excitability did not enable recognition of those patients with head tremor who could potentially develop cervical dystonia. The enhancement of brainstem interneuronal excitability found in approximately 30% of patients with head tremor could be related to plastic changes triggered by increased activity of the cranial muscles.</AbstractText>
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