• Julie Redfern, Nashid Hafiz, Karice Hyun, Andrew Knight, Charlotte Hespe, Clara K Chow, Tom Briffa, Robyn Gallagher, Christopher Reid, David L Hare, Nicholas Zwar, Mark Woodward, Stephen Jan, Emily R Atkins, Tracey-Lea Laba, Elizabeth Halcomb, Laurent Billot, Tracey Johnson, and Timothy Usherwood.
• Westmead Applied Research Centre, Faculty of Medicine and Health, The University of Sydney, PO Box 154 Westmead, Sydney, NSW, 2154, Australia. julie.redfern@sydney.edu.au.
• Bmc Fam Pract. 2020 Feb 14; 21 (1): 36.

BackgroundCardiovascular disease (CVD), including coronary heart disease (CHD) and stroke, is the leading cause of death and disability globally. A large proportion of mortality occurs in people with prior CHD and effective and scalable strategies are needed to prevent associated deaths and hospitalisations. The aim of this study is to determine if a practice-level collaborative quality improvement program, focused on patients with CHD, reduces the rate of unplanned CVD hospitalisations and major adverse cardiovascular events, and increases the proportion of patients achieving risk factor targets at 24 months.MethodsCluster randomised controlled trial (cRCT) to evaluate the effectiveness of a primary care quality improvement program in 50 primary care practices (n~ 10,000 patients) with 24-month follow-up. Eligible practices will be randomised (1:1) to participate in either the intervention (collaborative quality improvement program) or control (standard care) regimens. Outcomes will be assessed based on randomised allocation, according to intention-to-treat. The primary outcome is the proportion of patients with unplanned CVD hospitalisations at 2 years. Secondary outcomes are proportion of patients with major adverse cardiovascular events, proportion of patients who received prescriptions for guideline-recommended medicines, proportion of patients achieving national risk factor targets and proportion with a chronic disease management plan or review. Differences in the proportion of patients who are hospitalised (as well as binary secondary outcomes) will be analysed using log-binomial regression or robust Poisson regression, if necessary.DiscussionDespite extensive research with surrogate outcomes, to the authors' knowledge, this is the first randomised controlled trial to evaluate the effectiveness of a data-driven collaborative quality improvement intervention on hospitalisations, CVD events and cardiovascular risk amongst patients with CHD in the primary care setting. The use of data linkage for collection of outcomes will enable evaluation of this potentially efficient strategy for improving management of risk and outcomes for people with heart disease.Trial RegistrationAustralian New Zealand Clinical Trials Registry (ANZCTR) number ACTRN12619001790134 (dated 20th December 2019).

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