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At least 955 records · Page 53Linked to original sources
PubMed2004

Unruptured intracranial aneurysms: benign curiosity or ticking bomb?

15 years ago, the treatment of incidentally discovered intracranial aneurysms was straightforward with a good evidence base behind it. When intracranial aneurysms were identified, people were referred to neurosurgeons who would offer surgical repair if the patient was in reasonable health and had a good life expectancy. Since that time, several studies have given contradictory evidence for what should be done with these lesions, and a new technique for the repair of aneurysms, endovascular coil embolisation, has been developed. Here we review the research and make several recommendations. First, incidentally discovered aneurysms in the anterior circulation less than 7 mm in size in people with no personal or family history of subarachnoid haemorrhage should be left untreated. Second, people with remaining life expectancy of less than 20 years or so (ie, those over age 60 years) should be informed that from a statistical point of view the benefits of treatment do not outweigh the risks. Third, in all other cases treatment with surgical clipping or coil embolisation should be advised. And finally, if surgical treatment is not feasible then medical hypotensive treatment may be a viable alternative.

Diagnostic Imaging↗
PubMed2003

Mind bomb is a ubiquitin ligase that is essential for efficient activation of Notch signaling by Delta.

Lateral inhibition, mediated by Notch signaling, leads to the selection of cells that are permitted to become neurons within domains defined by proneural gene expression. Reduced lateral inhibition in zebrafish mib mutant embryos permits too many neural progenitors to differentiate as neurons. Positional cloning of mib revealed that it is a gene in the Notch pathway that encodes a RING ubiquitin ligase. Mib interacts with the intracellular domain of Delta to promote its ubiquitylation and internalization. Cell transplantation studies suggest that mib function is essential in the signaling cell for efficient activation of Notch in neighboring cells. These observations support a model for Notch activation where the Delta-Notch interaction is followed by endocytosis of Delta and transendocytosis of the Notch extracellular domain by the signaling cell. This facilitates intramembranous cleavage of the remaining Notch receptor, release of the Notch intracellular fragment, and activation of target genes in neighboring cells.

Animals↗
PubMed2004

Establishing remediation levels in response to a radiological dispersal event (or "dirty bomb").

The detonation of a radiological dispersal device (RDD) could produce significant social and economic damage, the extent of which would depend largely on how quickly and effectively cleanup levels were established and on public acceptance of those levels. This paper shows that current radiological cleanup laws and regulations, models for converting dose or risk goals to cleanup concentrations, and existing site-specific criteria were not designed specifically for RDD cleanups but, absent changes, would apply by default. The goals and approaches of these legal and methodological structures often conflict; using them in response to terrorism could undermine public confidence, cause delays, and produce unnecessary costs or unacceptable cleanups. RDD cleanups would involve immediate priorities not envisioned in the existing radiological cleanup framework, such as balancing radiation risks with the health, economic, and other societal impacts associated with access to the infrastructure necessary to sustain society (e.g., hospitals, bridges, utilities). To minimize the achievement of terrorism goals, the elements of an RDD cleanup response--including updating existing legal/regulatory structures to clarify federal authority, goals, and methods for developing RDD cleanup criteria--must be in place soon; given the complexity of the issues and the potential societal impact, this effort should be expedited.

Disaster Planning↗
PubMed1999

Accuracy of Klason lignin and acid detergent lignin methods as assessed by bomb calorimetry.

An accurate method for estimation of lignin concentration is important for prediction of the digestible energy content of livestock feeds. The accuracy of lignin concentration estimates based on the Klason lignin and acid detergent lignin methods was compared. Ten diverse forage samples were analyzed for protein, carbohydrates, lipids, organic acids, ash, lignin (by both methods), and gross energy. The accuracy of the two lignin concentration estimates was examined by comparing the measured forage gross energy to a gross energy value calculated from the compositional analysis. Use of the acid detergent lignin estimate in this gross energy calculation accounted for 68-84% of the forage gross energy compared to 85-97% of the gross energy using Klason lignin. These results indicate that while Klason lignin estimates are substantially higher than acid detergent lignin estimates, Klason lignin is the more accurate lignin method and does not overestimate lignin because gross energy recoveries were less than 100%.

Animal Feed↗
PubMed1999

Incidence of thyroid cancer in Scandinavia following fallout from atomic bomb testing: an analysis of birth cohorts.

OBJECTIVES: The occurrence relation between radioactive fallout from nuclear testing at Novaja Semlja in north-west Russia and the incidence of thyroid cancer in Norway and Sweden was studied following a birth cohort approach. METHODS: Birth cohorts with presumably different levels of exposure were identified according to calendar year of atomic tests and previous Norwegian estimates of the population dose (born 1947-1950 received low exposure in late childhood, born 1951-1962 received the highest exposure in early childhood, born 1963-1970 were not exposed). For each one-year birth cohort the incidence rates were calculated, with denominators based on exact population figures for each year of follow-up. RESULTS: In a stratified analysis, the relative risk for the highest exposed cohorts born 1951-1962, compared to those not exposed born 1963-1970, was found to decrease with increasing age from a borderline significant relative risk (RR) of 1.7 (95 percent confidence interval, 95% CI: 1.0-3.0) for children in the age-group 7-14 years to no excess risk among those 20-24 years of age (RR: 0.9; 95% CI: 0.7-1.2). The mean age at diagnosis of thyroid cancer in the age-group 7 14 years was lowest in the birth cohorts with the highest exposure. The Poisson regression analysis showed essentially the same results, with an improved fit when adding an interaction term between age and birth-cohort to a basic model with age, gender, birth-cohort and country. CONCLUSION: These results are compatible with an increased risk of thyroid cancer during childhood and adolescence for subjects exposed to radioactive fallout early in life. Alternative explanations for the pattern of incidence are discussed.

Adolescent↗
PubMed2000

Thyroid cancer in French Polynesia between 1985 and 1995: influence of atmospheric nuclear bomb tests performed at Mururoa and Fangataufa between 1966 and 1974.

BACKGROUND: Between 1966 and 1974, France performed 41 atmospheric nuclear weapon tests in the Mururoa and Fangataufa atolls in French Polynesia. METHODS: We performed a geographic analysis of thyroid cancer incidence, using data from the cancer registry of French Polynesia, medical evacuation files, insurance records and hospital and pathology laboratory files. RESULTS: A total of 153 thyroid cancers were diagnosed between 1985 and 1995 in the population born before 1976 and residing in French Polynesia. The incidence of thyroid cancer was 2-3 times larger in French Polynesia than in Maoris of New Zealand and Hawaiians of Hawaii. Based on few cases, a nonsignificant (p = 0.1) increase with decreasing distance between Mururoa and the birth place was observed in women born between 1950 and 1975 for thyroid cancer. CONCLUSION: Because the difference between Polynesian and reference populations was not larger for Polynesians who were children during the tests than for Polynesians born earlier; as would be expected in the case of radioiodine contamination, the high thyroid cancer rates in French Polynesia could hardly be attributed to radioiodine fallout. Nevertheless, a surveillance of the population born close to Mururoa is necessary to confirm or deny the existence of a higher risk of thyroid cancer in this population.

Adolescent↗