Older people admitted to hospital are at high risk of rehospitalization and medication errors. We have demonstrated, in a randomized controlled trial, that a clinical pharmacist intervention reduces the incidence of revisits to hospital for patients aged 80 years or older admitted to an acute internal medicine ward. The aims of this thesis were to further study the effects of the intervention and to investigate possibilities of targeting the intervention by identifying predictors of treatment response or adverse health outcomes. The effect of the pharmacist intervention on the appropriateness of prescribing was assessed, by using three validated tools. This study showed that the quality of prescribing was improved for the patients in the intervention group but not for those in the control group. However, no association between the appropriateness of prescribing at discharge and revisits to hospital was observed. Subgroup analyses explored whether the clinical pharmacist intervention was equally effective in preventing emergency department visits in patients with few or many prescribed drugs and in those with different levels of inappropriate prescribing on admission. The intervention appeared to be most effective in patients taking fewer drugs, but the treatment effect was not altered by appropriateness of prescribing. The most relevant risk factors for rehospitalization and mortality were identified for the same study population, and a score for risk-estimation was constructed and internally validated (the 80+ score). Seven variables were selected. Impaired renal function, pulmonary disease, malignant disease, living in a nursing home, being prescribed an opioid and being prescribed a drug for peptic ulcer or gastroesophageal reflux disease were associated with an increased risk, while being prescribed an antidepressant drug (tricyclic antidepressants not included) was linked with a lower risk. These variables made up the components of the 80+ score. Pending external validation, this score has potential to aid identification of high-risk patients. The last study investigated the occurrence of prescription errors when patients with multi-dose dispensed (MDD) drugs were discharged from hospital. Twenty-five percent of the MDD orders contained at least one medication prescription error. Almost half of the errors were of moderate or major severity, with potential to cause increased health-care utilization.

Les événements indésirables médicamenteux (EIM) regroupent à la fois les effets indésirables des médicaments (ADR : Adverse Drug Reactions), considérés comme non évitables et les erreurs médicamenteuses (EM), considérées comme évitables. L’objectif de cette thèse est d’étudier les EIM conduisant à une admission en réanimation.Dans un premier temps, nous avons effectué une revue systématique de la littérature portant sur l’incidence des hospitalisations en réanimation pour EIM. Au total, 11 études ont été intégrées. L’incidence des EIM nécessitant une admission en réanimation variait de 0,37 à 27,4 %. Au total, 17,5 à 85,7 % de ces EIM étaient jugés évitables. Nous avons mené dans un second temps une étude observationnelle d’une durée d’un an dans un service de réanimation médicale d’un hôpital universitaire. Cette étude avait pour objectif d’évaluer l’incidence, l’évitabilité, la sévérité, le coût des EIM responsables d’admissions en réanimation et d’identifier les causes amorces à l’origine des EM.Au total, 743 séjours ont été inclus dont 102 (13,7 %) étaient liés à une EM et 71 (9,6 %) à un ADR. Le taux d’événements évitables était ainsi de 0,59. La non-observance des patients à leur traitement médicamenteux était la principale cause amorce des EM (n = 31/102). Les 102 séjours évitables liés à une EM représentaient un total de 528 journées d’hospitalisation en réanimation, occupant ainsi en moyenne 1,4 lit par jour sur une période d’un an pour un coût total de 747 651 €.Ce travail conclue sur la nécessité d’effectuer des études complémentaires afin d’évaluer les moyens à mettre en œuvre pour réduire l’incidence des EIM responsables d’admissions en réanimation. / Adverse drug events (ADE) include adverse drug reactions (ADR), considered as not preventable and medication errors (ME), considered as preventable. The aim of this thesis is to describe ADE responsible for ICU admissions. First, we conducted a systematic review dealing with the incidence of ADE requiring ICU admission in adult patients. A total of 11 studies were included in the meta-analysis. The reported incidences of ADE requiring ICU admission ranged from 0.37 to 27.4%. Preventable events accounted for 17.5 to 85.7% of the events.To get more insight into this topic and to complete the published data, we performed a one-year observational study in a medical ICU of a teaching parisian hospital. The objectives of the study were to estimate the incidence of ICU admissions due to ADE, to assess preventability, severity and costs of these ADE and to determine the leading causes of medication errors (preventable ADE). A total of 743 admissions were included with 102 stays (13.7%) related to ME and 71 (9.6%) related to ADR. Medication non-compliance was the main leading cause of ME (n = 31/102). The 102 medication error-related admissions accounted for a total of 528 days of hospitalization in the ICU, requiring a mean of 1.4 ICU beds per day over the one-year period, with an associated total cost amounting to 747,651 €.This work concludes that further studies should be performed to assess ways to reduce the incidence of ADE responsible for ICU admissions.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / INTRODUCTION: Although patient safety institutions define High-Alert Medications (MAVs) as those that are at increased risk of causing significant harm to patients as a result of a failure to use, there are few scientific studies to prove the prevalence of harm due to MAVs. OBJECTIVES: To determine the prevalence of harm to patients involving MAVs due to medications errors (MEs) in hospitals. Make recommendations for conducting studies that identify harm caused by MEs and for the preparation of lists of MAVs. METHODOLOGY: Chapter 1 was carried out through a systematic review of the PubMed, Scopus, Web of Science and Lilacs databases, considering the studies published until April 2017, using descriptors and their synonyms in different combinations. Then, titles, abstracts and full texts were evaluated by two authors independently, according to the previously established inclusion criteria. In case of discrepancies, a third evaluator was consulted. The articles were included when they determined or allowed the determination of the rates of harm caused by MAVs as a result of MEs in hospitals. Chapter 2 comprised recommendations for patient safety from the studies found in chapter one. RESULTS: In the systematic review, five articles met the inclusion criteria. The overall prevalence of harm resulting from MEs involving MAVs was 16.3%. Less than 0.01% of MEs involving MAVs resulted in death. Hypotension, hypoglycemia, hyperglycemia, hemorrhage, cardiac arrest, stroke, prolonged hospitalization, coma, permanent injury, death have been reported. The drugs most related to the damages were 15% potassium chloride, insulin, anticoagulants, epoprostenol, anesthetics. The recommendations proposed in chapter two include methods for conducting studies that identify MEs harm and emphasize the importance of hospital units to create their own lists of MAVs. CONCLUSION: Two-thirds of the medications on the ISMP list of MEs from the United States and Brazil did not provide evidence of potential harm. In general, few studies - characterized by methodological and conceptual heterogeneity - were performed to determine the prevalence of harm resulting from errors involving these drugs. / INTRODUÇÃO: Embora instituições de segurança do paciente definam os Medicamentos Alta Vigilância (MAVs) como aqueles que apresentam risco aumentado de provocar danos significativos aos pacientes em decorrência de falha no processo de utilização, há poucos estudos científicos que comprovem a prevalência dos danos devidos erros com MAVs. OBJETIVOS: Determinar a prevalência dos danos aos pacientes envolvendo MAVs em decorrência de erros de medicação (EMs) em hospitais. Realizar recomendações para realização de estudos que identifiquem danos causados por EM e para elaboração das listas de MAVs. METODOLOGIA: O Capítulo 1 foi realizado através de uma revisão sistemática nas bases PubMed, Scopus, Web of Science e Lilacs, sendo considerados os estudos publicados até abril de 2017, usando descritores e seus sinônimos em diferentes combinações. Em seguida foram avaliados títulos, resumos e textos completos por dois autores de forma independente, de acordo com os critérios de inclusão previamente estabelecidos. Em caso de discrepâncias, um terceiro avaliador foi consultado. Os artigos foram incluídos quando determinaram ou possibilitaram a determinação das taxas de danos causados por medicamentos de alta vigilância em decorrência de erros de medicação em hospitais. O Capítulo 2 compreendeu recomendações para segurança do paciente apartir dos estudos encontrados no capítulo um. RESULTADOS: Na revisão sistemática, cinco artigos atenderam os critérios de inclusão. A prevalência geral de danos decorrentes de EMs envolvendo MAVs foi de 16,3%. Menos de 0,01% dos EMs envolvendo MAVs resultaram em morte. Foram reportados danos como hipotensão, hipoglicemia, hiperglicemia, hemorragia, parada cardíaca, acidente vascular cerebral, hospitalização prolongada, coma, lesão permanente, morte. Os medicamentos mais relacionados aos danos foram cloreto de potássio a 15%, insulina, anticoagulantes, epoprostenol, anestésicos. As recomendações propostas no capítulo dois incluem métodos para realização de estudos que identifiquem danos provocados por EMs e refoça a importância das unidades hospitalares criarem suas próprias listas de MAVs. CONCLUSÃO: Dois terços do medicamentos presentes na lista de MAVs do ISMP dos Estados Unidos e do Brasil não apresentaram evidências quanto ao potencial de provocar danos. Em geral, poucos estudos - caracterizados por heterogeneidade metodológica e conceitual - foram realizados para determinar a prevalência de danos decorrentes de erros envolvendo esses medicamentos. / São Cristóvão, SE