Assessing the Viability of a Vocal Cord Vibration Switch for Four Children with Multiple Disabilities

ABSTRACT

This prospective case series evaluated the viability of a recently-developed vocal cord vibration switch with four participants between the ages of 5.8-14.5 years old who had severe motor disabilities and complex communication needs. At the time of study enrolment, participants did not have an established single switch access pathway but were all capable of some form of vocalization, albeit frequently unintelligible. Participants were each provided with a vocal cord vibration switch for unrestricted home use. Participants were subsequently followed for a one-month period and switch viability was evaluated on three separate occasions. Viability of the switch was assessed in terms of quantitative measures such as switch sensitivity, specificity, and user-perceived exertion, along with qualitative characterizations such as ease of use and user satisfaction reported by the participants, their caregivers, and their clinicians. Data from the three consecutive assessments indicated low levels of exertion, device sensitivity between 73.3% and 93.2%, and specificity between 98.1% and 100%. All four participants reported that they liked the device and expressed desire to continue using it. In addition, clinicians and caregivers unanimously agreed that the device was the most viable access solution for their clients.