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.

Este estudo foi realizado na localidade de Alcanar (Tarragona, Espanha) e objetivou avaliar o efeito de cinco concentrações do ácido indolbutírico (AIB) (0,0; 0,5; 1,0; 1,5; 2,0 g/L) e da inoculação com micorrizas arbusculares (MA) (Glomus intraradices Schenck & Smith) sobre o desenvolvimento vegetativo, conteúdo foliar de P e K e morfologia radicular de plântulas de citrange Carrizo (Citrus sinensis (L.) X Poncirus trifoliata (L.) Raf.). Utilizou-se o delineamento experimental de blocos completos casualisados em esquema fatorial, com 4 repetições e 10 plantas por parcela. A aplicação de AIB não alterou o desenvolvimento vegetativo das plântulas cultivadas em ausência de MA, apesar de haver incrementado a quantidade de P e K e a espessura dos feixes vasculares. As MA incrementaram o conteúdo de P foliar. Encontrou-se uma interação positiva entre o AIB e as MA, pois as plântulas micorrizadas apresentaram um incremento no desenvolvimento vegetativo, nos conteúdos foliares de P e K e na espessura dos feixes vasculares com o aumento das concentrações de AIB.

This study was carried out in Alcanar (Tarragona - Spain) to evaluate the effect of five indolebutyric acid (IBA) concentrations (0.0; 0.5; 1.0; 1.5; 2.0 g/L) and inoculation with arbuscular mycorrhizae fungi (AMF) (Glomus intraradices Schenck & Smith) on Carrizo citrange (Citrus sinensis (L.) x Poncirus trifoliata (L.) Raf.) vegetative development, P and K foliar contents and root morphology. The experimental design was in a Completly Randomized Block Design with 10 seedlings per plot and 4 replicates. The IBA concentrations had no effect on vegetative development of nonmycorrhizal seedlings, althougt it had increased P and K foliar contents and primary xylem tickness. AMF increased P foliar content. IBA x AMF interaction was observed, increasing IBA concentrations on mycorrhizal seedlings resulted in increased in vegetative development, P and K foliar contents and primary xylem thickness.