The Safety of Outpatient Health Care: Review of Electronic Health Records: Annals of Internal Medicine: Vol 0, No 0
Background: Despite considerable emphasis on delivering safe care, substantial patient harm occurs. Although most care occurs in the outpatient setting, knowledge of outpatient adverse events (AEs) remains limited. Objective: To measure AEs in the outpatient setting. Design: Retrospective review of the electronic health record (EHR). Setting: 11 outpatient sites in Massachusetts in 2018. Patients: 3103 patients who received outpatient care. Measurements: Using a trigger method, nurse reviewers identified possible AEs and physicians adjudicated them, ranked severity, and assessed preventability. Generalized estimating equations were used to assess the association of having at least 1 AE with age, sex, race, and primary insurance. Variation in AE rates was analyzed across sites. Results: The 3103 patients (mean age, 52 years) were more often female (59.8%), White (75.1%), English speakers (90.8%), and privately insured (70.4%) and had a mean of 4 outpatient encounters in 2018. Overall, 7