The Comprehensive High-dose Aphasia Treatment (CHAT) programme is an intensive comprehensive aphasia programme, which aims to address evidence-practice gaps in aphasia rehabilitation where there are known barriers to service delivery requiring implementation strategies. The aims of this study are to (1) evaluate the clinical implementation of the CHAT programme, (2) assess the clinical effectiveness of CHAT compared with usual care in rehabilitation services and (3) determine whether the real-world implementation of CHAT compared with usual care is cost-effective.

Four participant groups will be recruited across six hospital and health services Australia-wide to participate in a type 3 hybrid effectiveness-implementation study: (1) people with aphasia, (2) support persons, (3) treating clinicians and students and (4) clinical stakeholders (eg, managers). This before-and-after study will include three time periods: (1) ‘usual care’ where people with aphasia will receive their usual care aphasia therapy, (2) ‘implementation transition’ where clinicians will be trained to deliver CHAT and (3) ‘intervention implementation’ where people with aphasia will receive the CHAT programme (ie, 50 hours of evidence-based aphasia therapy over 8 weeks). Evidence-based implementation strategies will be used to facilitate implementation within participating rehabilitation services. The primary outcome is delivery of evidence-based aphasia treatment (ie, CHAT) as measured by a composite score of quality indicators. Clinical effectiveness outcomes, measuring change in language impairment, communication effectiveness, confidence and quality of life, and implementation outcomes will also be examined. We will also conduct an embedded mixed-methods process evaluation and economic evaluation.

This study has been approved by the Royal Brisbane and Women’s Hospital Human Research Ethics Committee (HREC/2021/QRBW/72154). Outputs will include conference presentations, publications and a training package to optimise implementation of aphasia treatment in rehabilitation service contexts.

Australian New Zealand Clinical Trials Registry (ANZCTR) prospective registration ACTRN12621001765819. Trial registered 23 December 2021. https://anzctr.org.au/Trial/Registration/TrialReview.aspx?id=381365&isReview=true.