How accurate are emergency department medical staff in the interpretation of head injury related computed tomography?

Abstract

Introduction: Computed tomography (CT) brain has become a popular modality to detect head injury related problems for patients seen at the Emergency Departments (ED) in Hong Kong. This study aims to assess the diagnostic accuracy of local ED medical staff in interpretation of head injury related CT and to assess the association between years of working experience of ED medical staff and the diagnostic accuracy of CT brain interpretation. Methods: This is a retrospective cohort study reviewing all patients attending the ED of Princess Margaret Hospital in three years (from 2008 to 2010) with head injuries requiring CT brain during ED stay. The findings of CT brain by ED medical staff were compared with those by radiologists, the reference standard. Results: A total of 1716 cases were assessed. The overall sensitivity and specificity for detecting an abnormal CT were 0.66 (95% confidence interval [CI] 0.60-0.71) and 0.96 (95% CI 0.95-0.97), respectively. The sensitivity showed an increasing trend from 0.63 (95% CI 0.54-0.72) in ED staff with 0-3 years of working experience, to 0.71 (95% CI 0.59-0.84) with 4-6 years of experience and 0.75 (95% CI 0.63-0.86) with 7-10 years of experience. It dropped to 0.59 (95% CI 0.47-0.71) with more than 10 years of experience. Conclusions: The head injury related CT interpretation skill by ED medical staff is suboptimal. More training is necessary.