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Gastroenterology Research and Practice
Volume 2018, Article ID 1952086, 5 pages
Research Article

Infliximab Trough Levels and Quality of Life in Patients with Inflammatory Bowel Disease in Maintenance Therapy

Department of Surgery and Anatomy, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil

Correspondence should be addressed to Rogério S. Parra; rb.psu.prch@arrapsr

Received 25 January 2018; Revised 4 April 2018; Accepted 12 April 2018; Published 8 May 2018

Academic Editor: Paolo Gionchetti

Copyright © 2018 Rogério S. Parra et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Objective. Investigate the association between infliximab trough levels and quality of life in inflammatory bowel disease patients in maintenance therapy. Methods. We carried out a transversal study with inflammatory bowel disease patients in infliximab maintenance therapy. Infliximab trough levels were determined using a quantitative rapid test. Disease activity indices (partial Mayo Score and Harvey-Bradshaw Index) and endoscopic scores (endoscopic Mayo Score or Simple Endoscopic Score in Crohn’s disease) were obtained. Quality of life was assessed using the Inflammatory Bowel Disease Questionnaire (IBDQ). Results. Seventy-one consecutive subjects were included in the study (55 with Crohn’s disease and 16 with ulcerative colitis). Drug levels were considered satisfactory (≥3 μg/mL) in 28 patients (39.4%) and unsatisfactory (<3 μg/mL) in 43 (60.6%). Satisfactory trough levels were associated with higher rates of clinical remission and mucosal healing. Higher trough levels were also associated with improved IBDQ scores, particularly regarding bowel symptoms, systemic function, and social function. Conclusion. Satisfactory trough levels of infliximab were associated with higher rates of clinical remission, mucosal healing, and improved quality of life in inflammatory bowel disease patients on maintenance therapy.