Terrestrial impact structures as geoheritage: an assessment method of their scientific value and its application to Brazil

ABSTRACT Terrestrial impact structures are geological and geomorphological features with particular importance to understand the history and evolution of the planet. Impact structures are scattered around the world but in many countries these features are under threat, essentially due to anthropic factors. Impact structures with higher scientific value should be considered as geological heritage and, consequently, be subjected to geoconservation strategies. In order to select the most important impact structures to be properly conserved and managed, this paper proposes a quantitative assessment method of the scientific value of these structures. The eight Brazilian impact structures were used to test this method that has the potential to be applied to any geological context in any country. The structures known as Araguainha Dome-MT and Serra da Cangalha-TO reached a higher scientific value, which justifies the need to develop geoconservation strategies and a proper management.

Características clínicas de las gestantes con hipertensión arterial crónica atendidas en un hospital general de Lima / Clinical characteristics of pregnants with chronic hypertension attended in a general hospital in Lima

Objetivos: Describir las características epidemiológicas, clínicas y de laboratorio de las gestantes con hipertensión arterial crónica (HTAC), así como, conocer los resultados del producto de la gestación. Material y métodos: Estudio descriptivo, observacional, longitudinal, retrospectivo, tipo serie de casos. Se incluyeron pacientes gestantes con HTAC cuyo parto fue atendido en el Hospital Nacional Cayetano Heredia entre 2006 y 2012. Se utilizó estadística descriptiva, se determinaron frecuencias y porcentajes para las variables categóricas y medias y desviación estándar para las numéricas continuas. Resultados: Se incluyeron 41 gestantes con HTAC. El 56,1% tenía 35 o más años, 68,3% presentó preeclampsia sobreagregada. La tasa de filtración glomerular estimada fue < 90ml/min en 9,8%, el 58,8% presentó proteinuria en 24 horas > 300mg. El 73,2% tuvo parto abdominal, 41,5% de los recién nacidos fueron prematuros y el 39,1% tuvo peso menor a 2 500 g. Conclusiones: Las gestantes con HTAC presentan características clínicas y epidemiológicas similares a las descritas en otros estudios; con la diferencia que presentaron frecuencia alta de preeclampsia sobreagregada y complicaciones materno - perinatales. (AU)

Objectives: To describe epidemiological, clinical and laboratory characteristics of pregnants with chronic hypertension (CH), as well as to investigate the outcome of their pregnancies. Methods: Case series that included pregnants with CH atttended at Hospital Nacional Cayetano Heredia from 2006 to 2012. Descriptive statistics were used for categorial and continuos variables. Results: A total of 41 pregnants with CH were included; 56% had at least 35 years of age; 68.3% presented associated pre-eclampsia; 9.8% had estimated glomerular filtration rates < 90 mil/min, and 58.8% had proteinuria > 300mg measured in a 24 hour period. Abdominal delivery occured in 73.2%; 41.5% of newborns were pre-term, and 39.1% had body weight less than 2 500g. Conclusions: Pregnants with CH in this setting present with similar features as previously described in other studies, but higher rates of pre-eclampsia and mother-child complications were observed. (AU)