ABSTRACT
INTRODUCCIÓN: El metotrexato (MTX) es el fármaco sistémico más utilizado en el tratamiento de pacientes con artritis idiopática juvenil. Su efectividad viene limitada por el desarrollo de efectos adversos (EA). PACIENTES Y MÉTODOS: Estudio observacional descriptivo retrospectivo de la frecuencia y tipo de EA asociados a MTX en pacientes con artritis idiopática juvenil seguidos en un hospital terciario en el periodo 2008-2016. RESULTADOS: Se estudió a 107 pacientes, 71/107 mujeres (66,3%) con edad al diagnóstico de 6,4 años (RIC 3,1-12,4) durante una mediana de seguimiento de 45,7 meses (RIC 28,8-92,4). El 44,9% (48 pacientes) tenía oligoartritis y el 24,3% (n = 26) poliartritis factor-reumatoide negativo. El 48,6% (52/107) desarrolló EA, siendo los más frecuentes los síntomas gastrointestinales y los trastornos conductuales (35,6% cada uno). La edad mayor de 6 años al inicio del tratamiento aumentaba el riesgo de desarrollar EA, tanto en el estudio univariable (OR = 3,5; IC95% 1,5-7,3) como en el multivariable (aumento del riesgo del 12% por año). La dosis, vía de administración o forma clínica no presentaban relación con el desarrollo de EA. Veinte niños precisaron cambio de dosis o vía de administración, resolviéndose el EA en 11 (55%). MTX se suspendió en 37/107 pacientes (34,6%) por EA, principalmente por hipertransaminasemia (n = 14; 37,8%), síntomas gastrointestinales (n = 9; 24,3%) y trastornos conductuales (n = 6; 16,3%). CONCLUSIONES: MTX es el tratamiento de elección de niños con artritis idiopática juvenil pero produce EA en prácticamente el 50% de los pacientes. Aunque estos EA no son graves, obligan a interrumpir el tratamiento en el 35%
INTRODUCTION: Methotrexate (MTX) is the drug of choice for juvenile idiopathic arthritis. Its clinical efficacy is limited due to the development of adverse effects (AEs). PATIENTS AND METHODS: A retrospective observational study was conducted on the AEs associated with MTX therapy in children diagnosed with juvenile idiopathic arthritis followed-up in a tertiary hospital between 2008 and 2016. RESULTS: The study included a total of 107 patients, of whom 71 (66.3%) were girls (66.3%). The median age at diagnosis was 6.4 years (IQR 3.1-12.4), with a median follow-up of 45.7 months (IQR 28.8-92.4). There were 48 patients (44.9%) with oligoarthritis, and 26 children (24.3%) with rheumatoid-factor negative polyarthritis. Of these, 52/107 (48.6%) developed AEs, with the most frequent being gastrointestinal symptoms (35.6%) and behavioural problems (35.6%). An age older than 6 years at the beginning of therapy increased the risk of developing AEs, both in the univariate (OR = 3.5; 95% CI: 1.5-7.3) and multivariate (12% increase per year) analyses. The doses used, administration route, or International League of Associations for Rheumatology (ILAR) classification, were not associated with the development of AEs. Twenty children required a dosage or route of administration modification, which resolved the AE in 11 (55%) cases. MTX was interrupted due to the development of AEs in 37/107 patients (34.6%), mainly due to increased plasma transaminases (n = 14, 37.8%), gastrointestinal symptoms (n = 9, 24.3%) and behavioural problems (n = 6, 16.3%). CONCLUSIONS: MTX is the therapy of choice for patients with juvenile idiopathic arthritis, but 50% of the children develop some form of AE. Although the AEs are not severe, they lead to interruption of therapy in 35% of the children
Subject(s)
Humans , Male , Female , Child, Preschool , Child , Antirheumatic Agents/adverse effects , Arthritis, Juvenile/drug therapy , Methotrexate/adverse effects , Antirheumatic Agents/therapeutic use , Methotrexate/therapeutic use , Retrospective StudiesABSTRACT
INTRODUCTION: Methotrexate (MTX) is the drug of choice for juvenile idiopathic arthritis. Its clinical efficacy is limited due to the development of adverse effects (AEs). PATIENTS AND METHODS: A retrospective observational study was conducted on the AEs associated with MTX therapy in children diagnosed with juvenile idiopathic arthritis followed-up in a tertiary hospital between 2008 and 2016. RESULTS: The study included a total of 107 patients, of whom 71 (66.3%) were girls (66.3%). The median age at diagnosis was 6.4 years (IQR 3.1-12.4), with a median follow-up of 45.7 months (IQR 28.8-92.4). There were 48 patients (44.9%) with oligoarthritis, and 26 children (24.3%) with rheumatoid-factor negative polyarthritis. Of these, 52/107 (48.6%) developed AEs, with the most frequent being gastrointestinal symptoms (35.6%) and behavioural problems (35.6%). An age older than 6 years at the beginning of therapy increased the risk of developing AEs, both in the univariate (OR=3.5; 95% CI: 1.5-7.3) and multivariate (12% increase per year) analyses. The doses used, administration route, or International League of Associations for Rheumatology (ILAR) classification, were not associated with the development of AEs. Twenty children required a dosage or route of administration modification, which resolved the AE in 11 (55%) cases. MTX was interrupted due to the development of AEs in 37/107 patients (34.6%), mainly due to increased plasma transaminases (n=14, 37.8%), gastrointestinal symptoms (n=9, 24.3%) and behavioural problems (n=6, 16.3%). CONCLUSIONS: MTX is the therapy of choice for patients with juvenile idiopathic arthritis, but 50% of the children develop some form of AE. Although the AEs are not severe, they lead to interruption of therapy in 35% of the children.
