Abstract
Thirty-two patients with hemifacial spasm were treated with 61 botulinum toxin (BT) injections. Some patients had post-BT lower facial paresis (LFP+group) while others did not suffer this side effect (LFP-group). Abnormal electromyography (EMG) recordings were more frequent in the LFP+ group (6/11) than in the LFP- group (3/21; p < 0.05). This result suggests that an EMG performed before any BT injection could detect the patients with a higher risk for this side effect. The first dose of BT might be lowered in such cases.
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