Chronic dyspnoea is a prevalent symptom, and primary care is ideally placed to identify and manage it. However, chronic dyspnoea is under-reported by patients and can be a diagnostic dilemma for practitioners. A fully automated system of patient screening, coupled with a clinical decision support system (CDSS) that uses a validated and evidence-based dyspnoea algorithm, may improve detection, diagnosis and management of the condition. There is currently no CDSS validated for chronic dyspnoea diagnosis and management in primary care in Australia. The objectives of this study are to assess the clinical impact of a CDSS for chronic dyspnoea in primary care. We hypothesise that the use of the CDSS will lead to a clinically significant improvement in patient-reported dyspnoea scores, reduced time to diagnosis and healthcare costs at 12 months compared with standard care.

The BREATHE study is an open-label, cluster-randomised controlled trial of standard of care compared with a CDSS. General practices (n=40) in metropolitan, regional/rural and rural/remote settings will be recruited and randomised equally to pre-screening for chronic dyspnoea and usual standard-of-care management or pre-screening and CDSS-guided management. The CDSS includes an algorithm derived from a robust data and clinical knowledge model and incorporates evidence-based recommendations for the assessment and management of chronic dyspnoea. It is integrated into general practice medical software systems, fitting in the workflow of general practitioners (GPs). Eligible patients will be ≥18 years old and will have previously consented to receive SMS communication from their practice. In-scope patients will receive an automated text message prior to their GP appointment and will be screened for chronic dyspnoea (≥4 weeks). Patients identified with chronic dyspnoea will be invited to participate in the BREATHE study and followed up for 12 months. The primary outcome is improvement in the Dyspnoea-12 (D-12) score from baseline to 12 months, measured by the Dyspnoea-12 (D-12) questionnaire. Secondary outcomes include disease-specific questionnaires to assess changes in clinical outcomes, time to final diagnosis, quality of life, healthcare utilisation and costs incurred to patients.

The trial is registered at ANZCTR (ACTRN12624001451594). ANZCTR is a primary registry that meets the requirements of the ICMJE and is listed on the ICTRP Registry Network.

The study protocol has been approved by the University of New South Wales Human Research Ethics Committee (HREC) (iRECS6645) and complies with the National Health and Medical Research Council ethical guidelines. Participating practices and each GP will provide written, informed consent. All patients being screened will provide electronic informed consent. Results of the study will be disseminated through various forums, including peer-reviewed publications and presentation at national and international conferences. Following the study, participating practices will be provided with a summary of the findings of the study, together with a full copy of any publications and a plain language statement for participants, which will be made available in the practice reception area.