Negative clinical outcomes of medication resulting in emergency department visits.

PURPOSE: The results of analyses of patients' health problems related to medication use have been highly variable due to various factors, such as different study methodology, diverse variables determined, fields of study. The aim of our study was to determine the prevalence and preventability of negative clinical outcomes of medication (NCOMs). METHODS: This was a cross-sectional study performed in the emergency departments (EDs) of nine Spanish hospitals during a 3-month period. A two-stage probabilistic sampling method was used , and a systematic appraisal tool was used to identify the NCOMs based on information gathered through patient interview and review of the medical records. Case evaluations were conducted in two phases by pharmacists and physicians. The prevalence and preventability of NCOM were calculated. A homogeneity test was performed to assess potential differences in the prevalence for each hospital. RESULTS: A total of 4,611 patients were included in the study. The overall prevalence of NCOMs was 35.7 % [95 % confidence interval (CI) 33.3-38.1]. These NCOMs could be divided into three categories: ineffectiveness (18.2 %; 95 % CI 16.2-20.1), necessity (14.9 %; 95 % CI 13.4-16.6), and lack of safety (2.4 %; 95 % CI 1.9-2.8). About 81 % (95 % CI 80.1-82.3) of the NCOMs could have been prevented. CONCLUSIONS: NCOMs provoked approximately one-third of visits to the EDs, and a high percentage of these were preventable. Implementation of strategies for patient safety and pharmaceutical care could help to prevent these problems and optimize the use of medications.

Terms used in patient safety related to medication: a literature review.

PURPOSE: There is a lack of homogeneity in the terminology used in the context of patient safety related to medication. The aim of this review was to identify the terms and definitions used in patient safety related to medication within the scientific literature. METHODS: Original and review articles that were indexed between 1998 and 2008 in MEDLINE and EMBASE and contained terms used in patient safety related to medication were included. Terms and definitions were extracted and categorised according to whether its definition referred to the process of medication use, or to the clinical outcome of medication use, or both. RESULTS: Of 2564 articles, 147 were included. Sixty terms used in patient safety related to medication with 189 different definitions were identified. Among terms that referred only to the process of medication use (n = 23), medication error provided the greatest number of definitions (n = 29). Among terms that referred only to the clinical outcome of medication use (n = 31), adverse drug event provided the greatest number of definitions (n = 15). Finally, among terms that referred both to the process of use and to the clinical outcome of medication use (n = 13), drug-related problem provided the greatest number of definitions (n = 7). CONCLUSIONS: A multitude of terms and definitions are used in patient safety related to medication. This heterogeneity makes it difficult to compare the results among studies and to appreciate the true magnitude of the problem. Classifying and unifying the terminology is necessary to advance in patient safety strategies.

Medicine-related problems resulting in emergency department visits.

OBJECTIVE: Our aim was to estimate the prevalence of medicine-related problems, understood as negative clinical outcomes, that result in hospital emergency department (ED) visits and to establish relationships among risk factors and the appearance of pharmacotherapy negative outcomes. METHODS: Methods A stratified two-stage probabilistic sampling approach was used which consisted of stratified random sampling of patients visiting the ED followed up by interviews. A systematic appraisal tool was used to identify pharmacotherapy negative outcomes within the framework of the information gathered. Bivariate and multivariate analyses were carried out. Cost per process was estimated. RESULTS: The prevalence of pharmacotherapy negative outcomes producing ED visits was 33.17% (95%CI: 31.09-35.25). These negative outcomes could be divided into three categories: ineffectiveness (19.76%; 95%CI: 17.92-21.60), necessity/use (10.52%; 95%CI: 9.48-11.56), and lack of safety (2.89%). About 73% (95%IC: 70.03-76.23) of the negative outcomes were considered to be preventable. Average cost per negative outcome was 329.5 euros (95%CI: 185.4-473.5). Factors associated with the appearance of negative outcomes were age, number of medicines taken, and the combined effect of both of these factors. Compared with those participants younger than 18 years, patients between 45 and 64 years of age presented an odds ratio (OR) of 2.52 (95%CI: 1.1-5.78), while those older than 65 years had an OR of 3.63 (95%CI: 1.27-10.35). Compared with people not using medicine(s), patients using one to two different medicines presented with an OR = 19.91 (95%CI: 8.28-47.87), and those using more than three medicines had an OR = 22.71 (95%CI: 3.05-69.26). Finally, compared with patients younger than 18 years and not using medicines, patients aged 45-64 years taking three or more different medicines presented with an OR = 64.07, while those older than 65 years taking three or more medicines presented with an OR = 31.50. CONCLUSION: The prevalence of negative clinical outcomes was 33%, of which more than 73% of these were preventable. Factors associated with their appearance were age, number of medicines, and their combined effect.