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RESUMEN Los trastornos motores y funcionales anorrectales son frecuentes en la población general. La manometría anorrectal permite estudiar la actividad motora anorrectal en reposo y simulando diferentes situaciones fisiológicas. La manometría anorrectal de alta resolución (MAR-AR) y de alta definición (MAR-AD) están utilizándose cada vez con más frecuencia en la práctica clínica. Con respecto a la técnica convencional, los catéteres de la MAR-AR y los de la MAR-AD proporcionan un mayor número de puntos de registro, ya que disponen de muchos sensores circunferenciales muy próximos entre sí. Ello permite la visualización en relación témporo-espacial (modo topográfico en 2 o 3 planos) al obtener un registro de presión continuo en el espacio por interpolación entre sensores muy próximos. La MAR-AR y la MAR-AD nos permiten realizar la técnica de una forma más estandarizada y reproducible y obtener un mejor estudio y comprensión de la anatomía funcional del complejo esfinteriano. Están desarrollándose nuevos parámetros específicos apropiados para utilizarse en la actualidad con estos sistemas y están siendo evaluados por diversos grupos de investigación, por lo que muchos de ellos no están disponibles para utilizarse en la práctica clínica. No obstante, aportan información muy relevante que está permitiendo redefinir la anatomía y la fisiología anorrectales. El objetivo de la presente revisión es describir las técnicas existentes para MAR-AR y MAR-D, exponer los valores publicados de normalidad y analizar los nuevos parámetros que estas técnicas permiten evaluar y que, posiblemente, en un futuro próximo serán de gran utilidad en la práctica clínica.

Background: Infliximab, an anti-tumour necrosis factor approved for treatment of Crohn's disease and ulcerative colitis, is administered at predefined interdose-intervals. On insufficient response or loss of response, treatment can be intensified. The lack or loss of response is likely related to complex pharmacokinetics of infliximab. Aims: To explore optimal dosing strategies of infliximab in treatment-naïve patients with ulcerative colitis through predictive Monte Carlo simulations based on a validated population PK model. Methods: A population of 2,000 treatment-naïve patients was generated by Montecarlo simulation. Six dosing strategies for maintenance therapy were simulated on this population. Strategies 1 and 2 consisted on 5 mg/kg and 6 mg/kg doses, respectively, and 8 weeks inter-dose interval. Strategies 3 and 4 used Individualized doses, adjusted to albumin level, sex and body weight, and a fix inter-dose interval of 8 weeks to achieve a target trough concentration of 5 mg/L or 6 mg/L, respectively. Strategies 5 and 6 used a fix dose of 5 mg/kg and individualized inter-dose intervals, adjusted to the same covariates, to achieve a target concentration, of 5 mg/L or 6 mg/L, respectively. Results: Strategies 2-6 reached trough levels statistically higher than strategy 1 (p < 0.05). Strategy 5 proved to be the best dosing strategy. It was associated with a higher proportion of responder patients than strategy 1 (62 % vs. 40 %) without reaching higher peak concentrations. Conclusions: Optimization of maintenance treatment of colitis with infliximab by a pharmacokinetic approach could benefit infliximab-naive patients with ulcerative colitis.

Aims: to assess oxidative stress in acute pancreatitis, its evolution over time and its relationship with the severity of the disease. Methods: during a two-year period, patients with acute pancreatitis with less than 24 hours of pain were evaluated. Serum was obtained the first, second and fourth day from admittance, if complications were detected, and after recovery. Malondialdehyde was determined by high performance liquid chromatography. Twenty healthy volunteers constituted the control group. Malondialdehyde between groups was compared with Mann-Whitney and Kruskal-Wallis tests; malondialdehyde evolution was studied with Wilcoxon test. Results: one hundred and sixty-nine patients were included (91 women, median age 67 years, range 20-95); 33 suffered a severe episode. Malondialdehyde decreased from first to fourth day (0.600 vs. 0.451 vs. 0.343 μM, respectively, p < 0.05). When complications were detected, malondialdehyde level was similar to that of first and second day (0.473 μM, p > 0.05). In severe attacks malondialdehyde was higher than in control group at day 2 (severe: 0.514; mild: 0.440; control: 0.347 μM, p < 0.05 severe vs. control). Conclusions: an early oxidative stress is observed in acute pancreatitis. In severe attacks, oxidative stress remains high longer than in mild episodes. The onset of complications is associated with high malondialdehyde concentration.Objetivos: valorar el estrés oxidativo en la pancreatitis aguda, su evolución a lo largo del tiempo y su relación con la gravedad de la enfermedad. Métodos: durante un periodo de dos años, se estudiaron los pacientes ingresados por pancreatitis aguda con dolor abdominal de menos de 24 horas de evolución. Se obtuvo suero de los pacientes el primer, segundo y cuarto día de ingreso, en el momento en que se detectaban complicaciones y tras la recuperación. La concentración de malondialdehído fue determinada utilizando cromatografía líquida de alta resolución. Veinte voluntarios sanos conformaron el grupo control. La concentración de malondialdehído entre los diferentes grupos se comparó utilizando el test de Mann-Whitney y el test de Kruskal-Wallis; la evolución de malondialdehído se valoró mediante el test de Wilcoxon. Resultados: se incluyeron 169 pacientes (91 mujeres, edad mediana 67 años, rango 20-95); 33 sufrieron un episodio grave. La concentración de malondialdehído descendió desde el primer al cuarto día (0,600 vs. 0,451 vs. 0,343 μM, respectivamente, p < 0,05). Cuando se detectaban complicaciones, los niveles de malondialdehído eran similares a los del primer y segundo día (0,473 μM, p > 0,05). En los episodios graves la concentración de malondialdehído fue superior que en el grupo control en el día 2 (grave: 0,514; leve: 0,440; control: 0.347 μM, p < 0,05 grave vs. control). Conclusiones: en la pancreatitis aguda existe un estrés oxidativo precoz. En los episodios graves, el estrés oxidativo permanece elevado durante más tiempo que en los episodios leves. El desarrollo de complicaciones se asocia a una elevada concentración de malondialdehído.

Objective: The objective of this study was to evaluate in an analytical and descriptive manner the evidence published so far on the use of polyethylene glycol (PEG), with or without electrolytes, in the management of functional constipation and the treatment of fecal impaction. Methodology: Search on MEDLINE, EMBASE and Cochrane databases until May 2016 of all publications adjusted to the following terms: constipation AND/OR fecal impaction AND (PEG OR polyethylene glycol OR macrogol OR movicol OR idralax OR miralax OR transipeg OR forlax OR golytely OR isocolan OR mulytely) NOT colonoscopy. Critical reading of selected articles (English or Spanish), sorting their description according to group age (adult/pediatric age) and within those, in accordance with study features (efficacy evaluation versus placebo, doses query, safety, comparison with other laxatives, observational studies and monographic review articles of polyethylene glycol or meta-analysis). Results: Fifty-eight publications have been chosen for descriptive analysis; of them, 41 are clinical trials, eight are observational studies and nine are systematic reviews or meta-analysis. Twelve clinical trials evaluate PEG efficacy versus placebo, eight versus lactulose, six are dose studies, five compare polyethylene glycol with and without electrolytes, two compare its efficacy with respect to milk of magnesia, and the rest of the trials evaluate polyethylene glycol with enemas (two), psyllium (one), tegaserod (one), prucalopride (one), paraffin oil (one), fiber combinations (one) and Descurainia sophia (one). Conclusions: Polyethylene glycol with or without electrolytes is more efficacious than placebo for the treatment of functional constipation, either in adults or in pediatric patients, with great safety and tolerability. These preparations constitute the most efficacious osmotic laxatives (more than lactulose) and are the first-line treatment for functional constipation in the short and long-term. They are as efficacious as enemas in fecal impaction, avoid the need for hospital admission and are well tolerated by patients (mainly when administered without electrolytes).

In this Clinical Practice Guideline we discuss the diagnostic and therapeutic approach of adult patients with constipation and abdominal complaints at the confluence of the irritable bowel syndrome spectrum and functional constipation. Both conditions are included among the functional bowel disorders, and have a significant personal, healthcare, and social impact, affecting the quality of life of the patients who suffer from them. The first one is the irritable bowel syndrome subtype, where constipation represents the predominant complaint, in association with recurrent abdominal pain, bloating, and abdominal distension. Constipation is characterized by difficulties with or low frequency of bowel movements, often accompanied by straining during defecation or a feeling of incomplete evacuation. Most cases have no underlying medical cause, and are therefore considered as a functional bowel disorder. There are many clinical and pathophysiological similarities between both disorders, and both respond similarly to commonly used drugs, their primary difference being the presence or absence of pain, albeit not in an "all or nothing" manner. Severity depends not only upon bowel symptom intensity but also upon other biopsychosocial factors (association of gastrointestinal and extraintestinal symptoms, grade of involvement, and perception and behavior variants). Functional bowel disorders are diagnosed using the Rome criteria. This Clinical Practice Guideline has been made consistent with the Rome IV criteria, which were published late in May 2016, and discuss alarm criteria, diagnostic tests, and referral criteria between Primary Care and gastroenterology settings. Furthermore, all the available treatment options (exercise, fluid ingestion, diet with soluble fiber-rich foods, fiber supplementation, other dietary components, osmotic or stimulating laxatives, probiotics, antibiotics, spasmolytics, peppermint essence, prucalopride, linaclotide, lubiprostone, biofeedback, antidepressants, psychological therapy, acupuncture, enemas, sacral root neurostimulation, surgery) are discussed, and practical recommendations are made regarding each of them.