Trombosis de la vena ovárica: serie de 3 casos en el Hospital Universitario de Cabueñes / Thrombosis of the ovarian vein: series of 3 cases at the Hospital Universitario de Cabueñes

Se presentan 3 casos de trombosis de la vena ovárica, uno en relación a cirugía pélvica y dos durante el postparto. La trombosis de la vena ovárica es una complicación rara, de presentación clínica inespecífica, lo que hace plantearse un diagnóstico diferencial con otras patologías más frecuentes (apendicitis, pielonefritis, etc), siendo la TAC el gold standard para su diagnóstico. El tratamiento más adecuado son los anticoagulantes.

We report 3 cases of varian vein thrombosis, one in relation with pelvic surgery and 2 during the postpartum period. The ovarian vein thrombosis is a rare complication, with inespecific symptoms, that is why it is obligatory to propose a differential diagnosis with more frecuent patologies (appendicitis, pyelonephritis, etc.), the CAT is the gold standard in its diagnosis. Anticoagulants are the most suitable treatment.

Influence of substrate concentration on the stability and yield of continuous biohydrogen production.

The effect of substrate concentration (sucrose) on the stability and yield of a continuous fermentative process producing hydrogen was studied. High substrate concentrations are attractive from an energy standpoint as they would minimise the energy required for heating. The reactor was a CSTR; temperature was maintained at 35 degrees C; pH was controlled between 5.2 and 5.3, and the hydraulic retention time (HRT) was 12 h. Online measurements were taken for ORP, pH, temperature, %CO2, gas output and %H2, and data logged using a MatLAB data acquisition toolbox. Steady-state operation was obtained at 10, 20 and 40 g/L of sucrose in the influent, but a subsequent step change to 50 g/L was unsustainable. The hydrogen content ranged between 50% and 60%. The yield of hydrogen decreased as the substrate concentration increased from 1.7 +/- 0.2 mol/mol hexose added at 10 g/L, to 0.8 +/- 0.1 mol/mol at 50 g/L. Sparging with nitrogen improved the hydrogen yield by at least 35% at 40 g/L and at least 33% at 50 g/L sucrose. Sparging also enabled steady-state operation at 50 g/L sucrose. Addition of an extra 4 g/L of n-butyric acid to the reactor operating at 40 g/L sucrose increased the butyrate concentration from 9,830 to 18,900 mg/L, immediately stopping gas production and initiating the production of propionate, whilst the addition of 2 g/L taking the butyrate concentration to 12,200 mg/L did not do so. It was shown that operation at 50 g/L sucrose in a CSTR in butyrate fermentation is possible.