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New AHRQ Study Finds Mixed Evidence On Use Of Radiofrequency Catheter Ablation For Treating Atrial Fibrillation
A procedure that sends targeted energy into the heart through a catheter can be used to treat a common type of irregular heartbeat, but little is known about the treatment"s long-term benefits and the best methods and circumstances for applying it, according to a new report funded by HHS" Agency for Healthcare Research and Quality.
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Travel Increases Risk Of Deep Vein Thrombosis, Study
A new study from the US suggests that travel is linked to a higher risk of developing a deep vein thrombosis (DVT), also known as a venous
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Developed Countries Must Address Global Warming To Prevent Disease, Hunger In Developing World
Pollution from the world"s wealthiest countries is spreading disease and hunger in developing countries, according to a new Oxfam International report, which calls on developed countries to address global warming when G8 leaders meet in Italy, the Globe and Mail reports. The report, titled "Suffering the Science: Climate Change, People and Poverty," says, "It is in the tropics where the bulk of humanity lives - many of them in poverty - that climate change is hitting now and hitting hardest" (Bailey, 7/6).
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Link Between Successful Weight Loss And Vitamin D Levels

Vitamin D levels in the body at the start of a low-calorie diet predict weight loss success, a new study found. The results, which suggest a possible role for vitamin D in weight loss, were presented at The Endocrine Society"s 91st Annual Meeting in Washington, D.C. "Vitamin D deficiency is associated with obesity, but it is not clear if inadequate vitamin D causes obesity or the other way around," said the study"s lead author, Shalamar Sibley, MD, MPH, an assistant professor of medicine at the University of Minnesota. In this study, the authors attempted to determine whether baseline vitamin D levels before calorie restriction affect subsequent weight loss. They measured circulating blood levels of vitamin D in 38 overweight men and women before and after the subjects followed a diet plan for 11 weeks consisting of 750 calories a day fewer than their estimated total needs. Subjects also had their fat distribution measured with DXA (bone densitometry) scans. On average, subjects had vitamin D levels that many experts would consider to be in the insufficient range, according to Sibley. However, the authors found that baseline, or pre-diet, vitamin D levels predicted weight loss in a linear relationship. For every increase of 1 ng/mL in level of 25-hydroxycholecalciferol - the precursor form of vitamin D and a commonly used indicator of vitamin D status - subjects ended up losing almost a half pound (0.196 kg) more on their calorie-restricted diet. For each 1-ng/mL increase in the active or "hormonal" form of vitamin D (1,25-dihydroxycholecalciferol), subjects lost nearly one-quarter pound (0.107 kg) more. Additionally, higher baseline vitamin D levels (both the precursor and active forms) predicted greater loss of abdominal fat. "Our results suggest the possibility that the addition of vitamin D to a reduced-calorie diet will lead to better weight loss," Sibley said. She cautioned, however, that more research is needed. "Our findings," she said, "need to be followed up by the right kind of controlled clinical trial to determine if there is a role for vitamin D supplementation in helping people lose weight when they attempt to cut back on what they eat." The National Institutes of Health, the University of Minnesota, and the Pennock Family Endowment at the University of Minnesota funded this study. Aaron Lohr The Endocrine Society


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