Adaptación transcultural del componente de síntomas gastrointestinales de la escala CTCAE versión 4. 02 / Transcultural adaptation of the component of gastrointestinal symptoms of the CTCAE scale version 4. 02

Resumen Objetivo: Realizar la traducción y adaptación transcultural del componente de síntomas gastrointestinales (SGI) de la escala CTCAE versión 4.02 en pacientes ambulatorios tratados con quimioterapia en el Instituto Nacional de Cancerología en Bogotá. Métodos: Se realizó una búsqueda manual en medios electrónicos de escalas en idioma inglés o español que evaluarán la presencia, frecuencia o intensidad de SGI en pacientes oncológicos. La selección de los ítems fue efectuada por consenso informal de un comité técnico, el cual verificó la concordancia entre los principales SGI descritos en la literatura y los incluidos en la escala, ya que estos podrían afectar el estado nutricional. Posteriormente, para la adaptación transcultural, se siguieron los pasos y recomendaciones del manual ISPOR y del grupo de calidad de vida EORTC. La prueba piloto se efectuó en 30 pacientes seleccionados por conveniencia, quienes cumplieron los criterios de inclusión. Resultados: El 52% eran hombres; la edad promedio fue de 54,2 años (+/- 15,3 años). Los cánceres más frecuentes fueron: colorrectal (28%), estómago (16%) y mama (12%). Los 14 SGI incluidos en la escala fueron experimentados por todos los pacientes, por lo cual se conservaron, y no se requirió adicionar ningún otro. El tiempo promedio de aplicación del instrumento fue de 5 minutos y el 90% de los participantes lo consideró adecuado. Conclusiones: Se generó un instrumento de 14 ítems para medir SGI en pacientes oncológicos ambulatorios sometidos a quimioterapia, el cual es de rápida aplicación y utiliza lenguaje de fácil comprensión para el paciente. Aunque todavía quedan por definir sus propiedades clinimétricas.

Abstract Objective: To carry out the translation and transcultural adaptation of the gastrointestinal symptoms component (GIS) of the CTCAE, scale version 4.02, in outpatient patients treated with chemotherapy at the National Cancer Institute, Bogotá (Colombia). Methods: It was performed a manual search of scales on electronic media, in English or Spanish languages, which will evaluate the presence and intensity of GIS in oncological patients. The selection of the items was made by an informal consensus of a technical committee, which verified the concordance between the main GIS described in the literature and those included in the scale, all of which could affect the nutritional status. For transcultural adaptation, there were followed the steps and recommendations of the ISPOR Handbook, as well as those of the EORTC quality of life group. The pilot test was conducted in 30 patients selected for convenience, who met the inclusion criteria. Results: 52% were men; the average age was 54.2 years (+/-15.3 years). The most frequent cancers were: colorectal (28%), stomach (16%) and breast (12%). The 14 GIS included in the scale were experienced by all patients, so they were retained, and no other addition was required. The average time of application of the instrument was 5 minutes, and 90% of the participants considered it appropriate. Conclusions: A 14-item instrument was generated to measure GIS in cancer patients who undergo outpatient chemotherapy, which is of fast application and uses a language that is easily understood by patients. Its clinimetrics properties remain to be defined.

Tendências de eventos toxicológicos relacionados a medicamentos atendidos por um Centro de Informações Toxicológicas / Trends of drug-related poisoning cases attended to at a poison control center

RESUMO: Introdução: Os eventos toxicológicos relacionados a medicamentos têm alto impacto na morbimortalidade, representando a primeira causa de intoxicação no Brasil. Objetivo: Descrever as tendências de casos de eventos toxicológicos relacionados a medicamentos atendidos por um Centro de Informações Toxicológicas. Método: Estudo com abordagem quantitativa (transversal e de tendência), com análise dos dados referentes aos casos de eventos toxicológicos relacionados a medicamentos atendidos pelo Centro de Informações Toxicológicas do Hospital Universitário da Universidade Estadual de Londrina. Os dados foram coletados das fichas de atendimento, referentes ao período de 1985 a 2014. Para a análise estatística, utilizou-se um modelo de regressão linear simples. Resultados: Dos 36.707 casos atendidos pelo serviço, 22,5% (n = 8.608) foram eventos toxicológicos relacionados a medicamentos. Houve um aumento da proporção de casos em ambos os sexos (R2 = 0,195; p = 0,014) e no sexo masculino (R2 = 0,403; p < 0,001). Detectou-se tendência de elevação da proporção de casos envolvendo a classe de analgésicos, anti-inflamatórios e imunossupressores (R2 = 0,521; p = 0,018), antidepressivos (R2 = 0,923; p < 001) e antipsicóticos (R2 = 0,869; p < 0,001). Os antimicrobianos apresentaram tendência de redução da proporção de casos (R2 = 0,773; p = 0,001). Conclusões: Observou-se tendência de aumento da proporção de casos de eventos toxicológicos relacionados a medicamentos no sexo masculino. Também houve aumento nas tendências envolvendo analgésicos/anti-inflamatórios/imunossupressores, antidepressivos e antipsicóticos.

ABSTRACT: Introduction: Drug-related poisonings have a high impact on morbidity and mortality, representing the first cause of intoxication in Brazil. Objective: To describe the trends of cases of drug-related poisonings attended to by a poison control center. Method: A quantitative approach (cross-sectional trend study) with data analysis of cases of drug-related poisonings attended to at the Poison Control Center of University Hospital of the State University of Londrina. Data were collected from service notification records for the period 1985 to 2014. For statistical analysis, a simple linear regression model was used. Results: Of the 36,707 cases attended to by the service, 22.5% (n = 8,608) were drug-related poisonings. There was an increase in the proportion of cases for both sexes (R2 = 0.195, p = 0.014) and males (R2 = 0.403, p < 0.001). There was a trend towards a higher proportion of cases involving the analgesic, anti-inflammatory and immunosuppressive drug classes (R2 = 0.521, p = 0.018), antidepressants (R2 = 0.923, p < 0.001) and antipsychotics (R2 = 0.869; p < 0.001). Antibiotics showed a trend toward a lower proportion of cases (R2 = 0.773, p = 0.001). Conclusions: There was a trend for a higher proportion of cases of drug-related poisonings in males. Also, there was an increased trend towards cases involving analgesics/anti-inflammatories/immunosuppressants, antidepressants and antipsychotics.

Vigilancia de eventos supuestamente atribuidos a la vacunación o inmunización (ESAVI) durante el año 2017 / Surveillance of events supposedly attributed to vaccination or immunization (ESAVI) during 2017

Los Eventos Supuestamente Atribuidos a la Vacunación o Inmunización o ESAVI se definen como todo cuadro clínico que aparece luego de la administración de una vacuna y que supuestamente pueda atribuirse a la misma. Incluye los errores programáticos relacionados con la vacunación. Un ESAVI grave es todo aquel evento que resulte en hospitalización o fallecimiento. Es importante mencionar que un ESAVI, si bien denota una asociación temporal, no implica necesariamente una relación de causa y efecto. La causalidad entre el evento y la vacunación se determinará mediante la investigación del caso. La información aquí presentada surge del análisis de la base de datos de ESAVI del Programa de Inmunizaciones de la Ciudad de Buenos Aires, alimentada por las notificaciones realizadas por efectores públicos y privados de la ciudad. Se incluyen residentes y no residentes de la ciudad, sin realizar distinción entre ellos. Para calcular las tasas se utilizó como denominador las dosis aplicadas en 2017 en la Ciudad de Buenos Aires, tanto a residentes como no residentes. Se cuenta con datos de aquellas vacunas incluidas en el Calendario Nacional de Vacunación del sector público, de la seguridad social y privado. (AU)

Treatment interruption of biological drugs and tofacitinib in rheumatoid arthritis: A systematic review of case reports

The aim of this study was to evaluate interruption of treatment with biological drugs and tofacitinib due to adverse events in patients with rheumatoid arthritis. A systematic review was performed in the electronic databases MEDLINE, Cochrane, Scopus, CRD, IPA, Lilacs and Scielo. Case reports addressing interruption of treatment due to any adverse event related to abatacept (ABA), adalimumab (ADA), anakinra (ANA), certolizumab pegol (CER), etanercept (ETA), golimumab (GOL), infliximab (IFX), rituximab (RTX), secukinumab (SEC), tocilizumab (TCZ), tofacitinib (TOF) or ustekinumab (UST) in rheumatoid arthritis patients were evaluated. Baseline data, patient profile, previous and current treatments, cause of discontinuation and information on reintroduction of treatment were extracted from the case reports. One hundred and fifty-four studies (154 patients) reported 162 discontinuations of rheumatoid arthritis treatment due to adverse events (ETA = 57; IFX = 46; ADA = 32; TCZ = 13; RTX = 5; ANA = 3; GOL = 2; ABA = 2; TOF = 1; CER = 1; SEC = 0 and UST = 0). The mean age of patients was 56 (± 12.1) years and 82% were female. Seventy-four adverse events were confirmed (related to used drug), and 138 were observed in patients using anti-TNF. The most common adverse events were infections (21%), skin disease (15%), autoimmune disease (13%) and hematological disorders (9%). Case reports are important in the detection of rare adverse events and should be considered in the choice of appropriate therapy for patients.

Adverse drug events identified in hospitalized patients in Brazil by International Classification of Diseases (ICD-10) code listings / Eventos adversos a medicamentos identificados em pacientes hospitalizados no Brasil de acordo com códigos da Classificação Internacional de Doenças (CID-10) / Eventos Adversos por Medicamentos identificados en pacientes hospitalizados en Brasil según los listados de códigos de la Clasificación Internacional de Enfermedades (CIE-10)

Studies of adverse drug events (ADEs) are important in order not to jeopardize the positive impact of pharmacotherapy. These events have substantial impact on the population morbidity profiles, and increasing health system operating costs. Administrative databases are an important source of information for public health purposes and for identifying ADEs. In order to contribute to learning about ADE in hospitalized patients, this study examined the potential of applying ICD-10 (10th revision of the International Classification of Diseases) codes to a national database of the public health care system (SIH-SUS). The study comprised retrospective assessment of ADEs in the SIH-SUS administrative database, from 2008 to 2012. For this, a list of ICD-10 codes relating to ADEs was built. This list was built up by examining lists drawn up by other authors identified by bibliographic search in the MEDLINE and LILACS and consultations with experts. In Brazil, 55,604,537 hospital admissions were recorded in the SIH-SUS, between 2008 and 2012, of which 273,440 (0.49%) were related to at least one ADE. The proportions and rates seem to hold constant over the study period. Fourteen out of 20 most frequent ADEs were identified in codes relating to mental disorders. Intoxications figure as the second most frequently recorded group of ADEs in the SIH-SUS, comprising 76,866 hospitalizations. Monitoring of ADEs in administrative databases using ICD-10 codes is feasible, even in countries with information systems under construction, and can be an innovative tool to complement drug surveillance strategies in place in Brazil, as well as in others countries.

Os estudos sobre eventos adversos a medicamentos (EAMs) são importantes para evitar de prejudicar o efeito positivo da farmacoterapia. Os EAMs têm impacto substancial nos perfis de morbidade da população e no aumento dos custos operacionais do sistema de saúde. As bases de dados administrativos representam uma fonte de informação importante para fins de saúde pública em geral e especificamente para identificar os EAMs. No intuito de contribuir para o conhecimento sobre EAMs em pacientes hospitalizados, o estudo examinou a aplicabilidade dos códigos da CID-10 (10ª revisão da Classificação Internacional de Doenças) ao Sistema de Informações Hospitalares do Sistema Único de Saúde (SIH-SUS). O estudo integrou uma avaliação retrospectiva de dados administrativos do SIH-SUS referentes aos anos de 2008 a 2012. Para tanto, foi elaborada uma lista de códigos da CID-10 relacionados a EAMs. A lista foi produzida a partir de uma consulta às listas projetadas por outros autores e identificadas através de uma busca em MEDLINE e LILACS e consultas com especialistas. No Brasil, foram registradas 55.604.537 internações hospitalares no SIH-SUS entre 2008 e 2012, das quais 273.440 (0,49%) estiveram relacionadas a pelo menos um EAM. As proporções e taxas de EAMs permaneceram constantes ao longo do período estudado. Quatorze dos vinte EAMs mais frequentes foram identificados através de códigos relacionados a transtornos psiquiátricos. As intoxicações figuram como o segundo grupo mais frequente de EAMs registrados no SIH-SUS, com 76.866 internações. O monitoramento dos EAMs com o uso dos códigos da CID-10 mostrou ser uma metodologia viável, mesmo em países com sistemas de informação ainda incompletos, e pode ser uma ferramenta inovadora para complementar as estratégias atuais de vigilância farmacológica no Brasil, assim como, em outros países.

Los estudios sobre eventos adversos por medicamentos (EAMs) son importantes, para no comprometer el impacto positivo de la farmacoterapia. Estos eventos tienen un impacto sustancial en los perfiles de morbilidad de la población e incrementan los costes operativos del sistema de salud. Las bases de datos administrativas son una importante fuente de información por motivos de salud pública y para identificar EAMs. Con el fin de contribuir al aprendizaje sobre EAM en pacientes hospitalizados, este estudio examinó el potencial de aplicar códigos CIE-10 (10ª revisión de la Clasificación Internacional de Enfermedades) a una base datos nacional del sistema de salud público (SIH-SUS). Este estudio estuvo constituido por una evaluación retrospectiva de EAMs, en la base de datos administrativa del SIH-SUS, desde 2008 a 2012. Para ello, se desarrolló la lista de la CIE-10 con códigos para EAMs. Esta lista se creó examinando listas diseñadas por otros autores, identificados a través de búsquedas bibliográficas en MEDLINE, LILACS y consultas con expertos. En Brasil, se registraron 55.604.537 admisiones hospitalarias en el SIH-SUS, entre 2008 y 2012, de las cuales 273.440 (0,49%) sufrieron al menos un EAM. Los porcentajes y tasas parecieron mantenerse constantes durante el periodo de estudio. Catorce de los 20 más frecuentes EAMs fueron identificados con códigos relacionados con enfermedades mentales. Las intoxicaciones fueron el segundo grupo registrado más común de EAMs en el SIH-SUS, representando 76.866 hospitalizaciones. La supervisión de EAMs en las bases de datos administrativas, usando los códigos CIE-10, es factible, incluso en países cuyos sistemas de información se encuentran en proceso de construcción, y puede ser un herramienta innovadora como complemento de las actuales estrategias de supervisión sobre medicamentos en Brasil, así como en otros países.

Prevalência e características dos eventos adversos a medicamentos no Brasil / Prevalencia y características de los eventos adversos con medicamentos en Brasil / Prevalence and characteristics of adverse drug events in Brazil

Resumo: O presente trabalho tem como objetivo descrever a prevalência e fatores associados a eventos adversos a medicamentos (EAM) referidos por usuários de medicamentos no Brasil. Trata-se de um estudo transversal de base populacional, realizado no período de setembro de 2013 a fevereiro de 2014, com dados coletados na Pesquisa Nacional sobre Acesso, Utilização e Promoção do Uso Racional de Medicamentos (PNAUM). Foram consideradas todas as pessoas que referiram o uso de medicamentos; entre elas, foram identificadas as que referiram pelo menos um problema com o uso do medicamento. Realizou-se uma análise descritiva para estimar a prevalência e os intervalos de 95% de confiança (IC95%) de EAM entre as variáveis estudadas, e foram calculadas as razões de prevalência bruta e ajustada, pela regressão de Poisson, na investigação dos fatores associados aos EAM. A prevalência de EAM no Brasil foi de 6,6% (IC95%: 5,89-7,41), sendo maior e estatisticamente significante após a realização da análise multivariada, entre pessoas do sexo feminino; residentes nas regiões Centro-oeste e Nordeste; que consumiam maior número de medicamentos; que percebiam seu estado de saúde como "ruim"; e que se automedicavam. Os EAM foram mais relatados para os medicamentos fluoxetina, diclofenaco e amitriptilina. Os EAM mais referidos pelos entrevistados foram sonolência, dor epigástrica e náuseas. Os EAM mais referidos pelos entrevistados foram de natureza leve, considerados evitáveis e estiveram associados a medicamentos de uso frequente pela população. Em razão desse estudo, foi possível conhecer a dimensão do problema ocasionado pelo uso de medicamentos no Brasil.

Resumen: El presente trabajo tiene como objetivo describir la prevalencia y factores asociados a eventos adversos con medicamentos (EAM), informados por usuarios de medicamentos en Brasil. Se trata de un estudio transversal de base poblacional, realizado durante el período de septiembre de 2013 a febrero de 2014, con datos recogidos en la Encuesta Nacional sobre el Acceso, Utilización y Promoción del Uso Racional de Medicamentos en Brasil (PNAUM). Se consideraron a todas las personas que informaron del uso de medicamentos; entre ellas, se identificaron a las que informaron de por lo menos un problema con el uso del medicamento. Se realizó un análisis descriptivo para estimar la prevalencia y los intervalos de confianza a 95% (IC95%) de EAM entre las variables estudiadas, y se calcularon las razones de prevalencia bruta y ajustada, por la regresión de Poisson, en la investigación de los factores asociados a los EAM. La prevalencia de EAM en Brasil fue de un 6,6% (IC95%: 5,89-7,41), siendo mayor y estadísticamente significante tras la realización del análisis multivariado, entre personas del sexo femenino; residentes en las regiones Centro-Oeste y Nordeste; que consumían un mayor número de medicamentos; que percibían su estado de salud como "malo"; y que se automedicaban. Se informaron de más EAM en medicamentos como: fluoxetina, diclofenaco y amitriptilina. Los EAM más referidos por los entrevistados fueron somnolencia, dolor epigástrico y náuseas. Los EAM más referidos por los entrevistados fueron de naturaleza leve, considerados evitables y estuvieron asociados a medicamentos de uso frecuente por la población. Con motivo de este estudio, fue posible conocer la dimensión del problema ocasionado por el uso de medicamentos en Brasil.

Abstract: The aim of this study was to describe the prevalence of adverse drug events (ADEs) and associated factors reported by users of medicines in Brazil. This was a cross-sectional population-based study conducted from September 2013 to February 2014 with data from the Brazilian National Survey on Access, Use, and Promotion of Rational Use of Medicines (PNAUM). The study included all individuals that reported the use of medicines and identified, among them, all those reporting at least one problem with the medicine's use. A descriptive analysis was performed to estimate ADE prevalence and 95% confidence intervals (95%CI) among the target variables. Crude and adjusted prevalence ratios were calculated using Poisson regression to investigate factors associated with ADEs. Overall ADE prevalence in Brazil was 6.6% (95%CI: 5.89-7.41), and after multivariate analysis, higher prevalence was associated with female gender, residence in the Central and Northeast regions, consumption of more medicines, "bad" self-rated health, and self-medication. The drugs most frequently reported with ADEs were fluoxetine, diclofenac, and amitriptyline. The most frequent ADEs were somnolence, epigastric pain, and nausea. Most reported ADEs were mild, avoidable, and associated with medicines used frequently by the population. The study provided knowledge on the size of the problem with use of medicines in Brazil.

Pharmacotherapeutic follow-up of patients with Chagas disease using benznidazole: drug-related problems and pharmaceutical interventions

Abstract INTRODUCTION Benznidazole (BNZ) is a drug available for the etiological treatment of Chagas disease. However, this drug is toxic and has a limited effectiveness on the chronic phase of this disease, often leading to poor treatment adherence. METHODS: This is a descriptive and exploratory study conducted at the Pharmaceutical Care Service for Chagas disease patients of the Federal University of Ceará. Drug-related problems (DRPs) and pharmaceutical interventions (PIs) were classified according to the Second Consensus of Granada. RESULTS: The average age of patients with Chagas disease was 62 years, with the majority residing in the Ceará countryside (86.7%), and having low education levels (63.3% with elementary school education). Regarding family income, most patients belonged to a household that earned ≤1-2 times the minimum wage per month. Approximately 73% of these patients complied with the BNZ treatment, and nearly 7% underwent therapy interruption after medical evaluation. A total of 189 DRPs were identified, of which 51.9% (n=98) were classified as potential, and 48.1% (n=91) as actual. The most frequent DRPs were related to safety (qualitative safety; n=70; 37%), necessity (non-adherence; n=52; 27.5%), and effectiveness (qualitative effectiveness/non-optimal drug selection; n=45; 23.8%). Among the 216 PIs conducted, the majority were related to patient education (n=168; 77.8%) and pharmacological strategy (n=42; 19.4%). CONCLUSIONS: This study indicates the need for pharmacotherapeutic monitoring in patients with Chagas because of the high number of therapeutic interventions, DRPs (approximately 3 DRPs/patient), BNZ adherence, and polypharmacy.

Comparación de dos métodos de evaluación de causalidad de sospechas de reacciones adversas a medicamentos (RAM): 2003-2009 / Comparison of two methods to assess causality of adverse drug reactions

Background: Assessment of causality is an essential part of pharmacological surveillance. Aim: To compare the causality assessment of suspected adverse drug reactions (ADRs) using algorithms proposed by Karch-Lasagna (K & L) and the World Health Organization (WHO). Material and Methods: All spontaneous reports of suspected ADRs in a pediatric ward of a regional hospital were included. Causality was categorized as definitive, probable, possible, conditional or unlikely. The agreement between K & L and WHO algorithms was assessed using binomial test proportions and kappa coefficients. Results: One hundred thirty reports of ADRs in 126 patients aged 2 to 11 years were analyzed. The suspected medications were antineoplastic drugs in 59% of cases and antimicrobials in 23%. The most common affected system was the skin and appendages in 35%. Using K & L algorithm, causality was categorized as definitive in 10% of cases, probable in 28.5%, possible in 35.4%, conditional in 23.1% and unlikely in 3.0%. Using WHO algorithm, the figures were 2.3, 34.6, 59.2, 2.3 and 1.5%, respectively. The degree of agreement between K & L and WHO algorithms was 32.3% (kappa = 0.004). Conclusions: K & L attributed a higher level of ADR causality than WHO algorithm.

Assessing Reliability of Medical Record Reviews for the Detection of Hospital Adverse Events / 예방의학회지

OBJECTIVES: The purpose of this study was to assess the inter-rater reliability and intra-rater reliability of medical record review for the detection of hospital adverse events. METHODS: We conducted two stages retrospective medical records review of a random sample of 96 patients from one acute-care general hospital. The first stage was an explicit patient record review by two nurses to detect the presence of 41 screening criteria (SC). The second stage was an implicit structured review by two physicians to identify the occurrence of adverse events from the positive cases on the SC. The inter-rater reliability of two nurses and that of two physicians were assessed. The intra-rater reliability was also evaluated by using test-retest method at approximately two weeks later. RESULTS: In 84.2% of the patient medical records, the nurses agreed as to the necessity for the second stage review (kappa, 0.68; 95% confidence interval [CI], 0.54 to 0.83). In 93.0% of the patient medical records screened by nurses, the physicians agreed about the absence or presence of adverse events (kappa, 0.71; 95% CI, 0.44 to 0.97). When assessing intra-rater reliability, the kappa indices of two nurses were 0.54 (95% CI, 0.31 to 0.77) and 0.67 (95% CI, 0.47 to 0.87), whereas those of two physicians were 0.87 (95% CI, 0.62 to 1.00) and 0.37 (95% CI, -0.16 to 0.89). CONCLUSIONS: In this study, the medical record review for detecting adverse events showed intermediate to good level of inter-rater and intra-rater reliability. Well organized training program for reviewers and clearly defining SC are required to get more reliable results in the hospital adverse event study.

Confusões e ambigüidades na classificação de eventos adversos em pesquisa clínica / Confusiones y ambigüedades en la clasificación de eventos adversos en investigación clínica / Confusions and ambiguities in the classification of adverse events in the clinical research

É comum considerar ambíguo como sinônimo de confuso. Em uma informação confusa, várias informações têm um mesmo significado. Na informação ambígua, ao contrário, vários significados são atribuídos a uma mesma palavra. Informações excessivas também geram ambiguidade, daí a necessidade de concisão e clareza na linguagem. O termo evento adverso (EA) é definido como qualquer ocorrência médica inconveniente, sofrida por um sujeito da pesquisa em investigação clínica. A confusão e a ambiguidade no uso de palavras podem gerar conseqüências importantes na valorização de EAs. O objetivo deste estudo, de natureza teórica, é harmonizar o vocabulário utilizado na caracterização dos riscos e na comunicação de EAs na pesquisa clínica. Os EAs podem ser classificados quanto à previsibilidade, frequência, gravidade, causalidade e seriedade. Muitas vezes, em documentos regulatórios, os EAs são definidos em função da seriedade e causalidade. A harmonização do vocabulário na comunicação de EAs é fundamental para evitar a utilização equivocada de palavras com sentido confuso, ou ambíguo.

It is quite common to consider the terms ambiguous and confusing as synonyms. Confusing information brings together various data with similar meanings. In ambiguous information, on the other hand, several meanings are assigned to a single word. Excessive information also generates ambiguity; therefore, a concise, clear language is demanded. The term adverse event (AE) is defined as any inconvenient medical occurrence suffered by a subject during a clinical investigation research. Confusion and ambiguity in the use of words may generate relevant consequences in the appraisal of AEs. The objective of this present theoretical study is to harmonize the vocabulary applied in the characterization of risks and in the communication of AEs in clinical research processes. AEs may be classified according to their predictability, frequency, gravity, causality, and severity. Regulatory documents usually address AEs in their severity and causality aspects. Vocabulary conformity in the communication of AEs is an essential step towards avoiding inaccurate use of words with confused or ambiguous meanings.

Es común considerar ambiguo como siendo sinónimo de confuso. En una información confusa, varias informaciones tienen un mismo significado. En la información ambigua, al contrario, varios significados son atribuidos a una misma palabra. Informaciones excesivas también generan ambigüedad, por esa razón es necesario ser conciso y claro en el lenguaje. El término evento adverso (EA) es definido como cualquier ocurrencia médica inconveniente, sufrida por un sujeto participante del estudio, en investigación clínica. La confusión y la ambigüedad en el uso de las palabras pueden generar consecuencias importantes en la valorización de los EAs. El objetivo de este estudio, de naturaleza teórica, es armonizar el vocabulario utilizado en la caracterización de los riesgos y en la comunicación de los EAs en la investigación clínica. Los EAs pueden ser clasificados en cuanto a su previsibilidad, frecuencia, gravedad, causalidad y seriedad. Muchas veces, en documentos normativos, los EAs son definidos en función de la seriedad y causalidad. La armonización del vocabulario en la comunicación de EAs es fundamental para evitar la utilización equivocada de palabras con sentido confuso, o ambiguo.

The utility of the World Health Organization-The Uppsala Monitoring Centre (WHO-UMC) system for the assessment of adverse drug reactions in hospitalized children.

Although the World Health Organization-The Uppsala Monitoring Centre (WHO-UMC) system has been suggested as a practical tool for classifying adverse drug reactions (ADRs), verification of such system has not been examined. The objective of this study was to evaluate the usefulness of the WHO-UMC classification for the diagnosis of ADRs. The gold standard was the results of drug challenges and serum tryptase in cases of anaphylaxis. Twenty-seven children had ADRs classified by the WHO-UMC system. The causality terms were 'certain' in 4/27, 'probable' in 6/27, 'possible' in 10/27 and 'unlikely' in 7/27 of the patients. Skin prick tests and intradermal tests were positive in 1/20 and 1/5 of the patients, respectively. Drug challenges and serum tryptase were positive in 8/26 and 1/3 of the patients, respectively. After complete evaluation, the positive and negative ADRs were documented in 9/27 patients (33.33%) and 18/27 patients (66.67%), respectively. The multi-level likelihood ratios for ADRs using the WHO-UMC system were infinity in causality term 'certain', 2 in 'probable', 0.5 in 'possible', and 0 in 'unlikely'. In conclusion, causality term 'certain' and 'unlikely' of the WHO-UMC system had large impact on the likelihood of ADRs. In contrast, the causality term 'probable' and 'possible' had small impact on the likelihood of ADRs. Drug challenges and serum tryptase were helpful to confirm ADRs categorized by WHO-UMC system.