Cumulative geoecological effects of 62 years of infrastructure and climate change in ice-rich permafrost landscapes, Prudhoe Bay Oilfield, Alaska.

Many areas of the Arctic are simultaneously affected by rapid climate change and rapid industrial development. These areas are likely to increase in number and size as sea ice melts and abundant Arctic natural resources become more accessible. Documenting the changes that have already occurred is essential to inform management approaches to minimize the impacts of future activities.

[Morphological study of the myocardium in children and adults under normal conditions and in hypoxia].

At the light and electronic microscopes, 32 myocardial biopsies from 16 patients were studied. The study was carried out in 8 children under 5 years of age and in 8 adults over 20 years during open-sky surgery of the chest done to correct some congenital or acquired heart anomaly. Control biopsies were taken before the application of extracorporeal circulation and a second biopsy, after an average of 30 minutes of hypoxia, which was the time taken to perform the surgical correction of the anomaly.

[Surgical management of presacral sacrococcygeal teratomas, or with intrapelvic extension].

Two cases of sacrococcygeal teratomas that were successfully treated surgically through the abdominosacral route are reported. Besides, a series of 36 children diagnosed through a period of 30 years is reviewed and considerations are made on the importance the classification of teratomas has, to choose the best route of approach for the surgical removal of these tumors. Mention is made of symptoms that allow the diagnosis of presacral teratomas and of those that show intrapelvic or abdominal extension.