Facial Nerve Palsy
Conditions
Keywords
facial nerve palsy, facial paralysis, functional electrical stimulation, facial pacing
Brief summary
Purpose of the trial is to study the activations of paralyzed facial muscles in a unilateral facial nerve palsy with a multi-channel electrical stimulator. The principle of the device is to measure muscle activity of the healthy side of the face by surface electromyography (EMG) and to use this information to stimulate the corresponding muscles of the paralyzed side. The ultimate goal is to develop a prosthetic device for persons with a facial nerve palsy. The trial consists of several different studies. The studies' aims are 1. To study activations of paralyzed facial muscles by the electrical stimulation. 2. To study different stimulation pulse waveforms, frequencies, and electrode placement and their effect on the muscle activations and the tolerability of the stimulation. 3. To study whether a symmetrical movement on the paralyzed side can be achieved with electrical stimulation when compared to the movements of the healthy side. 4. To study tolerability of stimulation-elicited eye blink when watching a film and the effect of the stimulation-induced blink on the eye symptoms, the visual acuity, and the effects of the stimulation on the lacrimal fluid. 5. To develop a method for facial pacing, i.e. measuring the muscle activations on the healthy side of the face and to use this information to stimulate and activate the healthy side of the face. Forty subjects with a chronic facial nerve palsy are recruited to the studies. Each subject can participate in one or several studies. Another forty subjects with an acute facial nerve palsy are recruited to the study on the tolerability and effect on the eye symptoms. Additionally, altogether ninety healthy volunteers are recruited to the studies in order to gather preliminary information on the tolerability and the effects of the stimulations.
Interventions
The intervention consists of activating paralyzed facial muscles with electrical stimulation.
Sponsors
Tampere University
Tampere University of Technology
Helsinki University Central Hospital
Tampere University Hospital
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 75 Years
Healthy volunteers
Yes
Inclusion criteria
* a unilateral peripheral facial nerve palsy (patients) * willingness to participate (patients, healthy volunteers)
Exclusion criteria
* malignant diseases (a previously treated cancer is not an exclusion criterion) * unstable cardiovascular disease * severe immune deficiency * other severe neurological diseases (causing cognitive or physical impairment) * diabetic neuropathy
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Amplitudee of the movement elicited by electrical stimulation | Immediate | The offline video analysis is done to determine the current threshold at which a movement of the target muscle is produced. Possible activations of the other muscles alongside the target muscle are also observed. The amplitude of the movement is analyzed offline from a video recording either visually by the investigators, or measured with a digital ruler. With visual evaluation, the outcome is measured on a rough level, i.e. whether the stimulated movement was larger in amplitude compared to the voluntary movement. With a digital ruler, the results a presented numerically (millimeters). The stimulated activation is compared to the voluntary activation of the muscle. Further, in some sub-studies, the facial activations are evaluated with the Facial Action Coding System. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Subjective ratings related to the tolerability of stimulations | Immediate | The participants evaluate the experienced discomfort and painfulness of the stimulation with a numeric rating scale (NRS). |
| Subjective ratings related to acceptability of the stimulated movement | Immediate | The participants evaluate the naturalness and symmetry and their satisfaction with the stimulation elicited movement with an NRS. |
| Visual acuity | Immediate | In substudies concerning the elicitation of eye blink, The visual acuity is measured for both eyes separately with a LogMAR chart before and after the stimulation session. |
| Changes in lacrimal fluid | Immediate | In substudies concerning the elicitation of eye blink, a lacrimal fluid sample is collected before and after the stimulation session to investigate the possible effects of the stimulation in its constitution. |
Countries
Finland
Outcome results
None listed