Effectiveness of electrical stimulation for rehabilitation of facial nerve paralysis

Abstract

Background: Despite no significant advantage being demonstrated for its use and no standardization of treatment guidelines, electrical stimulation is still applied by therapists to treat facial paralysis. The aim of this investigation was to determine whether electrical stimulation therapy for patients with acute or chronic facial nerve paralysis improves time to, and rates of full recovery and facial function compared with no intervention.

Method: A systematic review of randomized and quasi-randomized controlled trials through Scopus, Medline, PEDro, Embase, CINAHL, Pubmed, and Cochrane Library search engines for studies published up until August 2016. Reference lists were reviewed for further studies. Review Manager was used to extract data and review quality of the studies. Studies were assessed for randomization of participants, allocation concealment, blinding of participants, assessors and physiotherapists, presence and reporting of outcome data.

Results: Five studies were included for analysis – four during acute recovery and one in chronic facial nerve paralysis. In acute facial nerve paralysis, two studies found no benefit of electrical stimulation and two studies found improvement. A meta-analysis on changes in the House–Brackmann Score after treatment, rates of full recovery and time to full recovery showed no statistically significant difference between intervention and control groups. In chronic facial nerve paralysis, one study found improvements after extensive electrical stimulation on the Facial Paralysis Recovery Profile.

Conclusions: There is no evidence to support the use of electrical stimulation during the acute phase of recovery after Bell’s palsy and there is low-level evidence for patients with chronic symptoms. Furthermore, there is no evidence available on the use of electrical stimulation for other causes of facial nerve paralysis.

Keywords:

• Bell palsy
• Facial nerve
• Electrical stimulation therapy
• Facial paralysis
• Physiotherapy
• Rehabilitation