An integrated assessment of sediment remediation in a midwestern U.S. stream using sediment chemistry, water quality, bioassessment, and fish biomarkers.

A comprehensive biological, sediment, and water quality study of the lower Little Scioto River near Marion, Ohio, USA, was undertaken to evaluate the changes or improvements in biotic measurements following the removal of creosote-contaminated sediment. The study area covered 7.5 river miles (RMs), including a remediated section between RMs 6.0 and 6.8. Fish and macroinvertebrate assemblages, fish biomarkers (i.e., polycyclic aromatic hydrocarbon [PAH] metabolite levels in white sucker [Castostomus commersoni] and common carp [Cyprinus carpio] bile and DNA damage), sediment chemistry, and water quality were assessed at five locations relative to the primary source of historical PAH contamination-upstream (RM 9.2), adjacent (RM 6.5), and downstream (RMs 5.7, 4.4, and 2.7). Overall, the biomarker results were consistent with the sediment PAH results, showing a pattern of low levels of PAH bile metabolites and DNA damage at the upstream (reference or background location), as well as the remediated section, high levels at the two immediate downstream sites, and somewhat lower levels at the furthest downstream site. Results show that remediation was effective in reducing sediment contaminant concentrations and exposure of fish to PAHs and in improving fish assemblages (60% increase in index of biotic integrity scores) in remediated river sections. Additional remedial investigation and potentially further remediation is needed to improve the downstream benthic fish community, which is still heavily exposed to PAH contaminants.

Gestación heterotópica en inseminación artificial / Heterotopic pregnancy in artificial insemination

Nuestro objetivo es aportar un caso clínico de gestación heterotópica, interesante por su baja incidencia, y sus graves complicaciones por no diagnosticarse de forma temprana. La mayoría de las gestaciones heterotópicas descritas se producen tras tratamientos con técnicas de fecundación in vitro, menos frecuente tras inseminación artificial y excepcional en gestaciones espontáneas. Nuestro objetivo es resaltar el incremento de este tipo de gestaciones en los últimos años debido a técnicas de reproducción asistida y la importancia de su diagnóstico temprano. La gestación heterotópica está incrementando su incidencia debido a las técnicas de reproducción asistida, su frecuente debut tras la rotura de la gestación ectópica, hace que se convierta en una urgencia ginecológica por el importante sangrado materno que se produce y requiere de una actuación rápida. De ahí, remarcar la importancia de su diagnóstico por otra parte difícil, en fases asintomáticas y su sospecha ante un cuadro de dolor abdominal asociado a hemoperitoneo en una gestación intrauterina conseguida con técnicas de reproducción asistida (AU)

We report a case of heterotopic pregnancy, which is of interest due to its low incidence and the serious complications that can ensue when diagnosis is delayed. Most of the heterotopic pregnancies described occurred after in vitro fertilization techniques. These pregnancies are less frequent after artificial insemination and are exceptional in spontaneous pregnancies. Our objective is to emphasize the increase in this type of pregnancy in the last few years due to assisted reproduction techniques and to highlight the importance of early diagnosis. The incidence of heterotopic pregnancy is increasing due to the use of assisted reproduction techniques. This entity frequently presents after rupture of the ectopic pregnancy, leading to a gynecological emergency due to maternal bleeding, and requires prompt treatment. Consequently, we stress the importance of diagnosis, which is difficult, in the asymptomatic phase. Furthermore, a high index of suspicion should be maintained in abdominal pain associated with hemoperitoneum in an intrauterine pregnancy obtained after assisted reproduction techniques (AU)