Introduction Infectious endocarditis is a disease with a high morbi-mortality. In this communication 17 cases of infectious endocarditis (IE) associated to implantable electronic devices, which represented 6% of the endocarditis between 1992 and 2005 are shown. Objective To analize the clinical, evolutive and anatomopathological characteristics of a subgroup of patients with IE carriers of IED. Material and Methods Of a total of 263 patients with IE admitted in our hospital between 1992 and 2005, seventeen with IE associated to DEI were analyzed. IEs associated with IED were classified into: 1) early, occurred within 12 months post surgery, and 2) late, occurred after that period. In all the patients, samples for hemocultures were obtained, culture of all the material drawn during surgery and transthoracic/ transesophagic echocardiograms (EE) were performed. Results Of the 17 patients. 13 (73%) were males; the average age was 60 years and the time between the implant and the diagnosis was 344 days. Sixteen patients developed fever and bacteremia: the predominant germ was Staphylococcus aureus in 70% of the cases. In all cases the system was removed. Mortality was 17%. Conclusions IE associated to IED -that should be suspected always in the absence of another infectious focus- forms a subgroup that with diagnosis and early therapy has a lower mortality compared to the described in total mortality. As with IE without IED, hemocultures and echography are fundamental for the diagnosis.

Introducción La endocarditis infecciosa es una patología con una morbimortalidad elevada. En esta comunicación se presentan 17 casos de endocarditis infecciosa (EI) asociada con dispositivos electrónicos implantables (DEI), que representaron el 6% de las endocarditis entre 1992 y 2005. Objetivo Analizar las características clínicas, evolutivas y anatomopatológicas de un subgrupo de pacientes con EI portadores de DEI. Material y métodos De un total de 263 pacientes con EI admitidos en nuestra institución entre 1992 y 2005, se analizaron 17 con EI asociada con DEI. Las EI asociadas con DEI se clasificaron en: 1) temprana, la ocurrida dentro de los 12 meses del posquirúrgico, y 2) tardía, la producida luego de ese lapso. En todos los pacientes se obtuvieron muestras para hemocultivos, se efectuó el cultivo de todo material extraído durante la cirugía y se realizaron ecocardiogramas por vía transtorácica (ETT) y transesofágica (ETE). Resultados De los 17 pacientes, 13 (73%) eran hombres; la edad promedio fue de 60 años y el tiempo entre el implante y el diagnóstico fue de 344 días. Dieciséis pacientes presentaron fiebre y bacteriemia; el germen predominante fue Staphylococcus aureus en el 70% de los casos. En todos se extrajo el sistema. La mortalidad fue del 17%. Conclusiones La EI asociada con el DEI, que debe sospecharse siempre en ausencia de otro foco infeccioso, constituye un subgrupo que con diagnóstico y tratamiento precoz tiene una mortalidad menor que la global descripta. Al igual que para la EI sin DEI, los hemocultivos y la ecocardiografía son los pilares para el diagnóstico.

Objetivando avaliar a adsorção de boro em alguns solos sob vinhedos do cv. Concord, na região da Serra Gaúcha, desenvolveu-se, em 1991, um trabalho a partir de oito amostras onde se adicionaram diferentes concentrações de boro para obtenção da concentração de equilíbrio, determinando-se, através da equação de Langmuir, sua adsorção máxima para cada solo. Os solos estudados apresentaram capacidade de adsorção de boro, no pH original, de 71 a 416 mg/kg de solo. A equação de Langmuir foi mais consistente na descrição da adsorção de boro em quatro amostras das oito avaliadas.

Boron adsorption was evaluated in soils under vineyards of cv. Concord, in the Serra Gaúcha viticultural region of State of Rio Grande do Sul, Brazil. In 1991, an experiment was carried out with eight soil samples. Different concentrations of boron were added in order to obtain the equilibrium concentration. The maximum boron adsorption for each soil was evaluated using Langmuir equation. The soils studied showed high capability for boron adsorption at the original pH. The Langmuir equation was more consistent in the description of boron adsorption in four out of the eight evaluated samples.