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Erschienen in: Journal of Neurology 1/2012

01.01.2012 | Original Communication

Temporal discrimination thresholds in adult-onset primary torsion dystonia: an analysis by task type and by dystonia phenotype

verfasst von: D. Bradley, R. Whelan, O. Kimmich, S. O’Riordan, N. Mulrooney, P. Brady, R. Walsh, R. B. Reilly, S. Hutchinson, F. Molloy, M. Hutchinson

Erschienen in: Journal of Neurology | Ausgabe 1/2012

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Abstract

Adult-onset primary torsion dystonia (AOPTD) is an autosomal dominant disorder with markedly reduced penetrance. Sensory abnormalities are present in AOPTD and also in unaffected relatives, possibly indicating non-manifesting gene carriage (acting as an endophenotype). The temporal discrimination threshold (TDT) is the shortest time interval at which two stimuli are detected to be asynchronous. We aimed to compare the sensitivity and specificity of three different TDT tasks (visual, tactile and mixed/visual-tactile). We also aimed to examine the sensitivity of TDTs in different AOPTD phenotypes. To examine tasks, we tested TDT in 41 patients and 51 controls using visual (2 lights), tactile (non-painful electrical stimulation) and mixed (1 light, 1 electrical) stimuli. To investigate phenotypes, we examined 71 AOPTD patients (37 cervical dystonia, 14 writer’s cramp, 9 blepharospasm, 11 spasmodic dysphonia) and 8 musician’s dystonia patients. The upper limit of normal was defined as control mean +2.5 SD. In dystonia patients, the visual task detected abnormalities in 35/41 (85%), the tactile task in 35/41 (85%) and the mixed task in 26/41 (63%); the mixed task was less sensitive than the other two (p = 0.04). Specificity was 100% for the visual and tactile tasks. Abnormal TDTs were found in 36 of 37 (97.3%) cervical dystonia, 12 of 14 (85.7%) writer’s cramp, 8 of 9 (88.8%) blepharospasm, 10 of 11 (90.1%) spasmodic dysphonia patients and 5 of 8 (62.5%) musicians. The visual and tactile tasks were found to be more sensitive than the mixed task. Temporal discrimination threshold results were comparable across common adult-onset primary torsion dystonia phenotypes, with lower sensitivity in the musicians.
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Metadaten
Titel
Temporal discrimination thresholds in adult-onset primary torsion dystonia: an analysis by task type and by dystonia phenotype
verfasst von
D. Bradley
R. Whelan
O. Kimmich
S. O’Riordan
N. Mulrooney
P. Brady
R. Walsh
R. B. Reilly
S. Hutchinson
F. Molloy
M. Hutchinson
Publikationsdatum
01.01.2012
Verlag
Springer-Verlag
Erschienen in
Journal of Neurology / Ausgabe 1/2012
Print ISSN: 0340-5354
Elektronische ISSN: 1432-1459
DOI
https://doi.org/10.1007/s00415-011-6125-7

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