Intrafusal effects of botulinum toxin in post-stroke upper limb spasticity.

Abstract:

:A previous study in subjects with focal dystonia suggested that the greater and longer-lasting effect induced by botulinum toxin type A (BoNT-A) on the tonic vibration reflex (TVR) than on the maximal M-wave (M-max) might be the physiological marker of the toxin's action at the level of intrafusal muscle fibres. With this approach, we investigated the possible effect of BoNT-A on fusimotor synapses in eight patients with post-stroke spasticity (four with no residual motor capacity before treatment and four with partially spared muscle strength and residual motor capacity). TVR and M-max were recorded from the wrist and finger flexor muscles before treatment and at 1, 4 and 7 months afterwards. The TVR reduction was greater than the M-max reduction and remained fairly constant over time only in the subjects with a residual motor capacity before the treatment. This pilot study suggests that some degree of strength and active movement is necessary for the action of BoNT-A on intrafusal fibres.

journal_name

Eur J Neurol

authors

Trompetto C,Bove M,Avanzino L,Francavilla G,Berardelli A,Abbruzzese G

doi

10.1111/j.1468-1331.2008.02076.x

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

367-70

issue

4

eissn

1351-5101

issn

1468-1331

pii

ENE2076

journal_volume

15

pub_type

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