Interception of chronic medication discrepancies by the clinical pharmacist in the emergency department

The emergency department (ED) is a high-risk setting for the occurrence of medication discrepancies (MDs) due to inconsistencies between real and documented chronic medication therapies. A clinical pharmacist (CP) improves medication safety by performing a structured medication reconciliation on ED admission. The main objective was to identify the frequency and type of MDs in the chronic medication therapy by comparing the medication displayed in the home medication module of the electronic medical record and in the genereal practitioner's (GP) referral letter with the best possible medication history by performing a structured medication reconciliation on ED admission. This prospective, monocentric, interventional study was carried out in the ED of a tertiary care university hospital in Brussels, Belgium. Inclusion criteria were patients of at least 65 years, polypharmacy, ED admission between 8 a.m. and 4 p.m. on weekdays, hospitalization and signed informed consent. During 24 days, a CP performed a structured medication reconciliation in order to obtain the best possible medication history and registered all MDs. The CP compared the best possible medication history with the home medication module and the GP's referral letter and registered the different types of MDs. Eighty-three patients were included. The median number of medications in the home medication module and the best possible medication history was significantly different {7.0 [interquartile range (IQR), 5.0-11.0] vs. 8.0 (IQR, 6.0-11.0)/patient; P < 0.0001} with a median of 5.0 (IQR, 3.0-8.0) MDs per patient. Main MDs were omission (38.8%), addition (18.4%) and a deviant administration time (15.2%). Only 22.9% of patients ( N = 19) had a GP's referral letter containing their chronic medication therapy. The median number of medications in the GP's referral letter and the best possible medication history were significantly different [6.0 (IQR, 4.0-9.0) vs. 8.0 (IQR, 7.0-11.0)/patient; P < 0.0001] with a median of 6.0 (IQR, 5.0-11.0) MDs per patient. Main MDs were omissions (39.9%), deviant frequencies (35.3%) and doses (16.7%). A CP, integrated in a multidisciplinary ED team, enhances medication safety by intercepting MDs on ED admission. Few patients possess a GP's referral letter containing their chronic medication therapy and when they do, the accuracy and completeness are poor.