Background: Advance care planning (ACP) and involving family are particularly important in dementia, and primary care is a key setting. The purpose of this trial is to examine the impact and implementation of SHARING Choices, an intervention to improve communication for older adults with and without dementia through proactively supporting ACP and family engagement in primary care.

Methods: We cluster-randomized 55 diverse primary care practices across two health systems to the intervention or usual care. SHARING Choices is a multicomponent intervention that aims to improve communication through patient and family engagement in ACP, agenda setting, and shared access to the patient portal for all patients over 65 years of age. The primary outcomes include documentation of an advance directive or medical orders for life-sustaining treatment in the electronic health record (EHR) at 12 months for all patients and receipt of potentially burdensome care within 6 months of death for the subgroup of patients with serious illness. We plan a priori sub-analysis for patients with dementia. Data sources include the health system EHRs and the Maryland health information exchange. We use a mixed-methods approach to evaluate uptake, fidelity and adaptation of the intervention and implementation facilitators and barriers.

Conclusions: This cluster-randomized pragmatic trial examines ACP with a focus on the key population of those with dementia, implementation in diverse settings and innovative approaches to trial design and outcome abstraction. Mixed-methods approaches enable understanding of intervention delivery and facilitators and barriers to implementation in rapidly changing health care systems. CLINICALTRIALS: gov Identifier: NCT04819191.