The complexity of some diseases—as well as the inherent toxicity of certain drugs—has led to an increasing interest in the development and optimization of drug-delivery systems. Polymeric nanoparticles stand out as a key tool to improve drug bioavailability or specific delivery at the site of action. The versatility of polymers makes them potentially ideal for fulfilling the requirements of each particular drug-delivery system. In this review, a summary of the state-of-the-art panorama of polymeric nanoparticles as drug-delivery systems has been conducted, focusing mainly on those applications in which the corresponding disease involves an important morbidity, a considerable reduction in the life quality of patients—or even a high mortality. A revision of the use of polymeric nanoparticles for ocular drug delivery, for cancer diagnosis and treatment, as well as nutraceutical delivery, was carried out, and a short discussion about future prospects of these systems is included.

This study sought to determine the prevalence of malnutrition in patients with inflammatory bowel disease, to analyse the dietary beliefs and behaviours of these patients, to study their body composition, to evaluate their muscular strength and to identify the factors associated with malnutrition in these patients. This was a prospective, multicentre study. Crohn’s disease and ulcerative colitis patients from 30 Spanish centres, from the outpatient clinics, were included. A questionnaire of 11 items was applied to obtain data from patients’ dietary behaviour and beliefs. Patients who accepted were evaluated to assess their nutritional status using Subjective Global Assessment and body mass index. Body composition was evaluated through bioelectrical impedance. A total of 1271 patients were included [51% women, median age 45 years, 60% Crohn’s disease]. Of these, 333 patients underwent the nutritional evaluation. A total of 77% of patients declared that they avoided some foods to prevent disease relapse. Eighty-six per cent of patients avoided some foods when they had disease activity because of fear of worsening the flare. Sixty-seven per cent of patients modified their dietary habits after disease diagnosis. The prevalence of malnutrition was 16% [95% confidence interval = 12–20%]. In the multivariate analysis, history of abdominal surgery, active disease and avoidance of some foods during flares were associated with higher risk of malnutrition. The prevalence of malnutrition in inflammatory bowel disease patients was high. We identified some predictive factors of malnutrition. Most of the patients had self-imposed food restrictions, based on their beliefs.

Background and Aims: The aims of this study were to determine the prevalence of fatigue in patients with inflammatory bowel disease [IBD], to identify the factors associated with fatigue and its severity, to assess the impact of fatigue on quality of life [QoL], and to evaluate the relationship between fatigue and sleep disorders. Methods: This was a prospective multicentre study conducted at 22 Spanish centres. Consecutive patients followed at IBD Units were included. Fatigue was evaluated with the Fatigue Severity Scale [FSS] and the Fatigue Impact Scale [FIS]. Quality of life and sleep quality were assessed using the IBD Questionnaire-Short Form [IBDQ-9] and the Pittsburgh Sleep Quality Index [PSQI], respectively. Results: A total of 544 consecutive adult IBD patients were included [50% women, mean age 44 years, 61% Crohn’s disease]. The prevalence of fatigue was 41% (95% confidence interval [CI] = 37–45%). The variables associated with an increased risk of fatigue were: anxiety [OR = 2.5, 95% CI = 1.6–3.7], depression [OR = 2.4, 95% CI = 1.4–3.8], presence of extraintestinal manifestations [EIMs] [OR = 1.7, 95% CI = 1.1–2.6], and treatment with systemic steroids [OR = 2.8, 95% CI = 1.4–5.7]. The presence of EIMs [regression coefficient, RC = 8.2, 95% CI = 2.3–14.2], anxiety [RC = 25.8, 95% CI = 20.0–31.5], depression [RC = 30.6, 95% CI = 24.3–37.0], and sleep disturbances [RC = 15.0, 95% CI = 9.3–20.8] were associated with severity of fatigue. Patients with fatigue had a significantly decreased IBDQ-9 score [p < 0.001]. Conclusions: The prevalence of fatigue in IBD patients is remarkably high and has a negative impact on QoL. Therapy with systemic steroids is associated with an increased risk of fatigue. The severity of fatigue is associated with anxiety, depression, sleep disorders, and the presence of EIMs. Fatigue was not associated with anaemia, disease activity or anti-TNF therapy.

Background and Study Aims: The aim of this study was to assess the safety and usefulness of capsule endoscopy (CE) in pediatric patients with a suspicion of Crohn’s disease. Patients and Methods: CE was used in 12 patients (four girls, eight boys; age 12 - 16; weight range 43 - 87 kg). The indication was a clinical suspicion of Crohn’s disease not confirmed with traditional methods. Gastroscopy, colonoscopy, and small-bowel follow-through examinations were carried out in all of the patients, without any diagnostic findings. Ileoscopy was possible in 50 % of the patients, and the ileal mucosa and biopsies were normal in all cases. Results: The capsule was easily swallowed by all of the patients. They all excreted the capsule normally, and no complications were observed in any case. CE identified lesions suggestive of Crohn’s disease in seven of the 12 (58.3 %), and the majority of the lesions were in the ileum. Conclusions: CE is safe in pediatric patients over 12 years of age. The procedure appears to be a very useful diagnostic tool in children with Crohn’s disease.

The aims of this study were to assess the risk of relapse after discontinuation of anti-tumor necrosis factor (anti-TNF) drugs in patients with inflammatory bowel disease (IBD), to identify the factors associated with relapse, and to evaluate the overcome after retreatment with the same anti-TNF in those who relapsed. This was a retrospective, observational, multicenter study. IBD patients who had been treated with anti-TNFs and in whom these drugs were discontinued after clinical remission was achieved were included. A total of 1,055 patients were included. The incidence rate of relapse was 19% and 17% per patient-year in Crohn’s disease and ulcerative colitis patients, respectively. In both Crohn’s disease and ulcerative colitis patients in deep remission, the incidence rate of relapse was 19% per patient-year. The treatment with adalimumab vs. infliximab (hazard ratio (HR)=1.29; 95% confidence interval (CI)=1.01–1.66), elective discontinuation of anti-TNFs (HR=1.90; 95% CI=1.07–3.37) or discontinuation because of adverse events (HR=2.33; 95% CI=1.27–2.02) vs. a top-down strategy, colonic localization (HR=1.51; 95% CI=1.13–2.02) vs. ileal, and stricturing behavior (HR=1.5; 95% CI=1.09–2.05) vs. inflammatory were associated with a higher risk of relapse in Crohn’s disease patients, whereas treatment with immunomodulators after discontinuation (HR=0.67; 95% CI=0.51–0.87) and age (HR=0.98; 95% CI=0.97–0.99) were protective factors. None of the factors were predictive in ulcerative colitis patients. Retreatment of relapse with the same anti-TNF was effective (80% responded) and safe. The incidence rate of inflammatory bowel disease relapse after anti-TNF discontinuation is relevant. Some predictive factors of relapse after anti-TNF withdrawal have been identified. Retreatment with the same anti-TNF drug was effective and safe.