Hypometric anticipatory postural adjustments in dystonia are not affected by deep brain stimulation of globus pallidus internus.
Neurosci Lett
; 636: 151-157, 2017 01 01.
Article
in En
| MEDLINE
| ID: mdl-27836806
ABSTRACT
BACKGROUND:
Dystonia is a movement disorder with patterned, directional, and often sustained muscle contractions that produce abnormal postures or repetitive movements. Deep brain stimulation (DBS) of the globus pallidus internus (GPi) is an effective and safe treatment for medically refractory dystonia. However, recent studies reported gait problems, gait freezing and falls in patients treated with DBS. Because these symptoms may point to deficient gait initiation processes, we systematically assessed the anticipatory postural adjustments (APAs) prior to stepping in dystonia patients with GPi-DBS.METHODS:
Thirteen patients with focal/segmental dystonia under GPi-DBS and twelve healthy control subjects were included in the study. Data were collected using pressure sensitive sensors and APAs were studied by centre of pressure measures. We compared APAs of both groups and analysed the influence of GPi-DBS on APAs in patients.RESULTS:
Medio-lateral and antero-posterior COP displacements, total COP path, maximal APA velocity and 1st step length were all smaller in patients for both ON (p=0.006, p=0.018, p=0.002, p=0.016, p=0.04) and OFF (p=0.001, p=0.01, p=0.001, p=0.03, p=0.024) condition compared to healthy subjects. GPi-DBS did not change APA parameters in patients.CONCLUSIONS:
Observations that APAs are impaired in dystonia and are at the same time not affected by the stimulation current are compatible with the assumption that APAs and dystonic symptoms may rely on distinct networks, possibly within the same cortical and basal ganglia structures. With no effect of stimulation on APAs it is unlikely that this would be a mechanism of impaired balance in the patients after the surgery.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Gait Disorders, Neurologic
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Dystonia
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Gait
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Globus Pallidus
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Muscle Contraction
Limits:
Adult
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Aged
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Aged80
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Female
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Humans
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Male
/
Middle aged
Language:
En
Journal:
Neurosci Lett
Year:
2017
Document type:
Article