RT Journal Article SR Electronic T1 Diagnostic accuracy of GPs when using an early-intervention decision support system: a high-fidelity simulation JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP e201 OP e208 DO 10.3399/bjgp16X688417 VO 67 IS 656 A1 Olga Kostopoulou A1 Talya Porat A1 Derek Corrigan A1 Samhar Mahmoud A1 Brendan C Delaney YR 2017 UL http://bjgp.org/content/67/656/e201.abstract AB Background Observational and experimental studies of the diagnostic task have demonstrated the importance of the first hypotheses that come to mind for accurate diagnosis. A prototype decision support system (DSS) designed to support GPs’ first impressions has been integrated with a commercial electronic health record (EHR) system.Aim To evaluate the prototype DSS in a high-fidelity simulation.Design and setting Within-participant design: 34 GPs consulted with six standardised patients (actors) using their usual EHR. On a different day, GPs used the EHR with the integrated DSS to consult with six other patients, matched for difficulty and counterbalanced.Method Entering the reason for encounter triggered the DSS, which provided a patient-specific list of potential diagnoses, and supported coding of symptoms during the consultation. At each consultation, GPs recorded their diagnosis and management. At the end, they completed a usability questionnaire. The actors completed a satisfaction questionnaire after each consultation.Results There was an 8–9% absolute improvement in diagnostic accuracy when the DSS was used. This improvement was significant (odds ratio [OR] 1.41, 95% confidence interval [CI] = 1.13 to 1.77, P<0.01). There was no associated increase of investigations ordered or consultation length. GPs coded significantly more data when using the DSS (mean 12.35 with the DSS versus 1.64 without), and were generally satisfied with its usability. Patient satisfaction ratings were the same for consultations with and without the DSS.Conclusion The DSS prototype was successfully employed in simulated consultations of high fidelity, with no measurable influences on patient satisfaction. The substantially increased data coding can operate as motivation for future DSS adoption.