Adherence to a Prophylactic Swallowing Therapy Program During (Chemo) Radiotherapy: Impact of Service-Delivery Model and Patient Factors

Intensive, prophylactic swallowing therapy programs have been developed to improve dysphagia outcomes for patients with head/neck cancer (HNC) receiving (chemo)radiotherapy ([C]RT). Across studies, variable therapy adherence rates have been reported. Preliminary research suggests that service-delivery mode and demographic factors may influence adherence. This study examined patient adherence to a prophylactic swallowing therapy protocol across three service-delivery models: (1) clinician-directed face-to-face therapy, (2) technology-assisted therapy using the telepractice application, SwallowIT and (3) independent patient-directed therapy. The secondary aim explored the impact of patient factors on adherence. Patients with oropharyngeal HNC receiving definitive (C)RT were randomised to receive the Pharyngocise exercise protocol via clinician-directed (n = 26), patient-directed (n = 27) or SwallowIT-assisted (n = 26) models. Adherence was calculated as the percentage of prescribed exercise completed. Multiple patient factors were recorded at baseline. Adherence across the 6 weeks in all groups was low (27%), and declined from week 4 of (C)RT. The clinician-directed model yielded significantly (p = 0.014) better adherence than patient-directed therapy in weeks 1-3. There was also a trend for higher adherence in the SwallowIT group compared to patient-directed in weeks 1-3 (p = 0.064). Multivariable linear modelling identified active smoking at baseline (p < 0.001) and concomitant chemotherapy (p = 0.040) as significant negative predictors of adherence, with baseline reduced motivation trending towards significance. Although (C)RT-related toxicities will impact adherence, adopting service-delivery models with greater structure/support and providing extra assistance to patients with known risk factors may help optimise therapy adherence to prophylactic therapy programs. Telepractice may provide an alternate model to support adherence where service constraints limit intensive clinician-directed therapy.