LAUSR

Background: It is challenging for emergency physicians (EPs) to distinguish between patients with life‐threatening and benign headaches. We examined the effect of peer influence on computed tomography use by EPs for patients with headache and evaluated the peer influence effect in EPs with different levels of risk tolerance. Methods: We conducted a before‐ and after‐retrospective case review, and administered the Risk‐Taking subscale of the Jackson Personality Index to attending physicians. Each EP computed tomography (CT) use rate, patient number, and CT use, were e‐mailed every two months to enhance EP team norm and establish a trend in behavior. Results: Of the 665 (before intervention) and 669 (after intervention) patients with headache, 206 (31%) and 171 (25.6%) underwent brain CT scans, respectively. Decreased use of CT examination was found in the post‐intervention group (OR = 0.758, 95% CI: 0.593–0.967), especially for most risk‐tolerant physicians (OR = 0.530, 95% CI: 0.311–0.889). There was prolonged ED length of stay (LOS) in the pre‐intervention group (OR = 51.52, 95% CI: 26.998–76.050). Conclusions: We observed that peer influence is an effective way to improve CT use rate and emergency department LOS for patients with isolated headache, especially for most risk‐tolerant physicians. These findings could enhance the development of appropriate guidelines to assist ED physicians' CT use.