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N Jensen

Publications and source records attributed to N Jensen.

44 records · Page 3Linked to original sources
PubMedDate not supplied

Using evidence to make decisions.

Physicians sometimes question whether evidence-based medicine "is worth it." They rightfully feel they have been doing a pretty good job right along. This does indeed seem to be the case. Yet the world of medicine is changing rapidly--perhaps too rapidly for our previous habits to suffice. Resources are increasingly restricted even while technology grows explosively--the time, money, and availability of tests and treatments are no longer infinite. If we are to fight for the best decisions for our patients, we must be prepared to support our decisions with more than just opinions and anecdotes. The importance of medical ethics, common sense, and spirituality will not diminish for all this; indeed it may be enhanced as growing consensus on the evidence allows us to focus on the "non-evidence" aspects of our practices. The authors of this special issue of the Wisconsin Medical Journal hope that the concepts we have discussed will convince you to learn more about the important discipline of evidence-based medicine. It is an exciting paradigm for medicine in the coming millennium.

Decision Support Techniques↗
PubMedDate not supplied

Aerosol formation and reaction pathways of atmospheric oxidation of dimethylsulfide.

This paper concerns with three series of experiments about dimethylsulfide gas phase oxidation, carried out at increasing NOx level (< 20 ppb, 1 ppm, 10 ppm) to show the relation between the amounts of nitrogen oxides and the molar yields of sulfur containing products. DMSO, DMSO2, HCHO, HCOOH and SO2 were found as main reaction products. From these experiments and from preceding studies, a sensitive decrease in the quantity of total sulfur products in aerosol phase is underlined. This result derives from the reaction of NOx with CH3S(O)O2 and CH3S(O)OO radicals, which leads to stable intermediates as methylsulphonylperoxynitrate, MSPN, with a characteristic PAN-like structure.

Aerosols↗
PubMedDate not supplied

Heparinization of polytetrafluoroethylene (ePTFE) grafts. The effect on pseudointimal hyperplasia.

A study was undertaken to evaluate the effect of a covalent heparinization on thrombogenicity of ePTFE grafts in sheep. With scanning electron microscopy heparinization occurred as a thin smooth layer covering the network of ePTFE. Most of it had disappeared already after 2 hours. In long-term experiments a high and low flow part of the ePTFE graft was created in the carotid artery system. The heparinization had no effect on patency and there was no difference between the high and low flow parts of the graft. The graft surface was covered with fibrous tissue, which was significantly thicker than the pannus in the host vessel. In the graft interstices (internodal distance of 30 micron) capillaries were seen without difference between occluded and patent grafts. The capillary density was significantly higher proximally than distally.

Animals↗
PubMedDate not supplied

Trends in civilian vascular trauma during 30 years. A Swedish perspective.

Vascular injuries operated on during a 30-year period (1955-1984) were analyzed. There has been significant increase of such injuries, particularly the iatrogenic types. The total incidence per 100,000 population and year rose from 11.0 to 26.6. Various angiographic and catheterization techniques were responsible for the iatrogenic increase. The noniatrogenic vascular injuries not infrequently were part of multiple trauma, with fractures and a variety of penetrating wounds. Numerous operative techniques were used, increasingly with reconstructive surgery. The mortality rate did not change in the study period, but the rate of amputations and of various long-term sequelae diminished.

Adolescent↗