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Otolaryngol Head Neck Surg. 2000 Feb;122(2):246-52.

Effect of long-term electrical stimulation on motor recovery and improvement of clinical residuals in patients with unresolved facial nerve palsy.

Author information

1
National Center for Facial Paralysis, Inc, Washington, DC 20037, USA.

Abstract

PURPOSE:

This study investigated the efficacy of a pulsatile electrical current to shorten neuromuscular conduction latencies and minimize clinical residuals in patients with chronic facial nerve damage caused by Bell's palsy or acoustic neuroma excision.

SUBJECTS:

The study group included 12 patients (mean age 50.4 +/- 12. 3 years) with idiopathic Bell's palsy and 5 patients (mean age 45.6 +/- 10.7 years) whose facial nerves were surgically sacrificed. The mean time since the onset of paresis/paralysis was 3.7 years (range 1-7 years) and 7.2 years (range 6-9 years) for the Bell's and neuroma excision groups, respectively.

METHOD AND PROCEDURES:

Motor nerve conduction latencies, House-Brackmann facial recovery scores, and a 12-item clinical assessment of residuals were obtained 3 months before the onset of treatment, at the beginning of treatment, and after 6 months of stimulation. Patients were treated at home for periods of up to 6 hours daily for 6 months with a battery-powered stimulator. Stimulation intensity was kept at a submotor level throughout the study. Surface electrodes were secured over the most affected muscles. Groups and time factors were used in the analyses of the 3 outcome measures.

RESULTS:

No statistical differences were found between the two diagnostic groups with respect to any of the 3 outcome measures. Mean motor nerve latencies decreased by 1.13 ms (analysis of variance test, significant P = 0.0001). House-Brackmann scores were also significantly lower (Wilcoxon signed rank test, P = 0.0003) after treatment. Collective scores on the 12 clinical impairment measures decreased 28.7 +/- 8.1 points after 6 months [analysis of variance test, significant P = 0.0005). Eight patients showed more than 40% improvement, 4 better than 30%, and 5 less than 10% improvement in residuals score.

CONCLUSION:

These data are consistent with the notion that long-term electrical stimulation may facilitate partial reinnervation in patients with chronic facial paresis/paralysis. Additionally, residual clinical impairments are likely to improve even if motor recovery is not evident.

PMID:
10652399
DOI:
10.1016/S0194-5998(00)70248-8
[Indexed for MEDLINE]

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