RESUMO
Toxicity and uptake data for Limnodrilus hoffmeisteri generated by nickel in systems using three natural sediments (trout farms: El Oyamel, El Truchón, and El Potrero), are presented. Nickel uptake and hemoglobin concentration were studied in L. hoffmeisteri exposed to spiked sediments. Nickel concentration and its toxic effect on hemoglobin were used as indicators of exposure. Sediment texture was also considered. Hemoglobin concentration decreased after treatment with nickel. The hemoglobin concentration test indicated a response to the bioavailability of nickel. This investigation clearly documents that sediments of El Truchón, El Oyamel, and El Potrero exhibit a toxicity potential. These results suggest the usefulness of diversity of bioassays for evaluating the toxicity of sediments polluted with heavy metals.
Assuntos
Hemoglobinas/metabolismo , Níquel/toxicidade , Oligoquetos/metabolismo , Truta , Poluentes Químicos da Água/toxicidade , Animais , Água Doce/análise , México , Níquel/análise , Espectrofotometria Atômica , Poluentes Químicos da Água/análiseRESUMO
This is a prospective study in order to evaluate the association between placenta grade III changes and the neonatal outcome. A total of 370 patients divided into two groups were included: the case group included 182 patients with placenta grade III changes (placental senescence) and the control group included 188 cases with grade 0, I or II placenta. The patients with grade III placenta had more cases of oligohydramnios (37 vs 24%), cardiotocographic non reactive tests (35 vs 17 cases) and an elevated frequency of cesarean sections (83%), (P < 0.05). The newborns in both groups had not difference in birth weight and Apgar scores, but the senescence placental group had a higher incidence of meconium stained fluid (13 vs 8%, P < 0.05) and an increased admissions to special care nursery (17 vs 5 cases, P < 0.05). We concluded that our findings support that the placental senescence had a close association with the perinatal morbidity and we suggested a closer surveillance in these patients to improve the perinatal outcome.
Assuntos
Placenta/diagnóstico por imagem , Resultado da Gravidez , Ultrassonografia Pré-Natal , Adolescente , Adulto , Envelhecimento/fisiologia , Peso ao Nascer , Cesárea/estatística & dados numéricos , Feminino , Humanos , Apresentação no Trabalho de Parto , Placenta/fisiologia , Gravidez , Estudos ProspectivosRESUMO
La ruptura del ventrículo izquierdo una complicación rara. Los autores analizan la frecuencia de la ruptura del ventrículo izquierdo como complicación fatal de la cirugía en el Servicio de Cirugía Cardiovascular del Hospital Universitario de Caracas, se afectuaron 534 reemplazos mitrales como procedimiento único; se encontraron 9 casos de ruptura del ventrículo izquierdo con 1 sobre vida, lo cual da una mortalidad del 88.8%. Otros autores reportan cifras entre el 35 y 100% de mortalidad cuando se produjo el accidente. Se recomienda una buena selección de la prótesis a implantar y el tamaño no debe ser demasiado grande; igualmente son preferibles las prótesis, ya sean mecánicas o biológicas de bajo perfil, especialmente en los casos en que el ventrículo izquierdo es pequeño
Assuntos
Lactente , Pré-Escolar , Criança , Adolescente , Adulto , Pessoa de Meia-Idade , Humanos , Masculino , Feminino , Ruptura Cardíaca/complicações , Ruptura Cardíaca/cirurgia , Valva Mitral/cirurgiaRESUMO
There are described 3 cases of patients with LED in which the obtained results of AAN's research, by means of IFI, were negative in a transitory or a permanent way. This situation can motive the doubt at the diagnostic, even though it exists in a little patients' group. In this work there are revised its causes and mechanisms.