Medication prescribing errors in the prehospital setting and in the ED

Background: Medication errors are a common cause of iatrogenic adverse drug events. The incidence and nature of medication errors during prehospital treatment have not been fully described. Objectives: The objectives of this study are to describe the incidence and characteristics of medication errors in adults during prehospital emergency treatment and in the emergency department (ED) and to identify risk factors for medication errors in those settings. Methods: This is a retrospective study of adult patients transferred by emergency medical services to the ED of a university-affiliated hospital in Israel. The drugs administered in the mobile intensive care unit and in the ED were reviewed by 2 reviewers, who independently decided whether an error had occurred. The primary outcome was the number of drug errors per patient. Secondary outcomes were the type and severity of the errors and variables associated with increased incidence of drug errors. Results: During the study period, 1837 patients were brought to the ED by mobile intensive care unit vehicles. Five hundred thirty-six patient charts (29%) were randomly selected for review; 65 charts (12.12%) could not be found; thus, 471 charts were reviewed. In the emergency vehicle, 188 patients (45.63%) received medications; of those, 12.76% (24 patients) were subject to a medication error. The number of drugs administered and long evacuation times were associated with higher risk for an error (P < .01 and P = .011, respectively). The presence of a physician in the emergency vehicle did not alter the risk of an error (P = .95). In the ED, 332 patients (72.6%) received medications. Of those, medication errors occurred in 120 patients (36.1%). The more medications administered, the higher the risk of error (P < .01). Less errors occurred in trauma patients (P = .041). Conclusion: More medication errors occur in the ED than in the emergency vehicles. Patients treated with multiple medications are more prone to medication errors. (C) 2012 Elsevier Inc. All rights reserved.