The Effect of Sensory Level Versus Motor Level Electrical Stimulation of Pharyngeal Muscles in Acute Stroke Patients with Dysphagia: A Randomized Trial.

There was no control group given therapy alone. The team judged that unethical because stimulation was already standard practice on their unit, but it means the improvements could be spontaneous recovery in the weeks after a stroke rather than anything the stimulation did. Everyone received standard dysphagia therapy at the same time as the stimulation, so the contribution of the stimulation itself cannot be separated out. Only 31 people took part. That is small for detecting a difference between two intensity settings, and the trial was planned to test whether stimulation helped at all rather than to compare the two levels. All four participants whose strokes involved the brainstem were in the sensory group, which may have held that group's results back. Electrode placement was chosen by clinical judgement from each patient's swallow study, so it differed between participants and makes the two groups harder to compare. The ten-session course may be too short to change airway protection, which is the outcome the penetration-aspiration score measures. Quality of life was measured one month after the sessions ended, with no restriction on extra therapy during that month, so those results cannot be attributed to the stimulation. Three quality-of-life questionnaires were completed by the treating clinician rather than the patient or family, which could bias those scores. Some patients with severe apraxia, aphasia or dysarthria could not complete every exercise, though all managed at least 90% of them.

Do not take the sensory group's improvement as evidence that sensory stimulation works better than motor stimulation. The two groups were never significantly different from each other on any measure, and everyone received standard dysphagia therapy alongside the stimulation, so the sensory group's gains could be recovery, therapy or chance.