A Comparison of Voice and Psychotherapeutic Treatments for Adults With Functional Voice Disorders: A Systematic Review

Objective. To examine the effect of traditional voice therapy and cognitive therapy on the voice and client-wellbeing outcomes in adults with functional voice disorders (FVD). Methods. A systematic review of English articles was conducted using Medline (Ovid), Embase (Elsevier), CINAHL (Ebsco), The Cochrane Central Register of Controlled Trials (CENTRAL), PsychInfo (Ebsco) and Speechbite from inception to current date. Additional studies were identified through bibliographies and authors were contacted when further information was required from an article. All study designs were included with pretest/posttest outcome measures related to voice. Independent extraction of studies was completed by three authors using predefined data fields and quality assessment tools. Results. Outcomes of 23 studies (2 RCTs and 21 cohort or case studies) are summarised using a narrative style due to heterogeneity of interventions and outcome scales used. Overall research quality of included studies was low, with many cohort and case studies lacking controls, blinding and robust outcome measures. Conclusions. There are some benefits to pairing cognitive behavioural therapy (CBT) with traditional voice therapy for FVD including improved voice quality, psychosocial wellbeing and prevention of relapse. It is feasible to train speech-language pathologists (SLPs) in CBT-enhanced voice therapy. Further high-quality research is needed, however, to guide the clinical implementation of CBT for the management of FVD.