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Ozone key to link between heat and increased cardiovascular death risk

11-22-2007 · EurekAlert!

Ozone may prove the key to the link between high temperature and the increased risk of death from heart disease or stroke, suggests research published ahead of print in Occupational and Environmental Medicine.

Keywords: ozone, key, link, heat, increased, cardiovascular, death, risk

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No link between acid reflux and survival
01-03-2008 · EurekAlert!
Study provides reassuring evidence that people with acid reflux symptoms do not have an increased risk of death, finding no difference in survival rates between sufferers and nonsufferers.
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Advance in understanding of blood pressure gene could lead to new treatments
02-04-2007 · EurekAlert!
Research by scientists at UCL (University College London) has clearly demonstrated for the first time the structure and function of a gene crucial to the regulation of blood pressure. The discovery could be important in the search for new treatments for illnesses such as heart disease, the UK's biggest killer. In a paper published online today in Nature Medicine, the team, led by Professor Patrick Vallance and Dr James Leiper, UCL Department of Medicine, reveal the role of the human gene dimethylarginine dimethylaminohydrolase (DDAH), showing that loss of DDAH activity disrupts nitric oxide (NO) production. NO is critical in the regulation of blood pressure, nervous system functions and the immune system. The role of DDAH is to break down modified amino acids (Asymmetric dimethylarginine (ADMA) and monomethyl arginine (L-NMMA)) that are produced by the body and have been shown to inhibit NO synthase. These molecules accumulate in various disease states including diabetes, renal failure and pulmonary and systemic hypertension, and their concentration in plasma (the fluid component of blood) is strongly predicative of cardiovascular disease and death. In a healthy human body, the majority of ADMA is eliminated through active metabolism by DDAH. Scientists have hypothesised that if DDAH function is impaired, NO production is reduced, and that this could be an important feature of increased cardiovascular risk. To examine this pathway in more detail, the researchers deleted the DDAH gene in mice. These mice went on to develop hypertension, or high blood pressure. They also designed specific inhibitors (small molecules) which bind to the active site of human DDAH. These small molecule inhibitors also induced hypertension in mice, confirming the importance of DDAH in the regulation of blood pressure. Dr Leiper, UCL Medicine, said: “These genetic and chemical approaches to disrupt DDAH showed remarkably consistent results, and provide compelling evidence that loss of DDAH function increases the concentration of ADMA and thereby disrupts vascular NO signalling. “There has been considerable scientific interest in this pathway and the role of ADMA as a novel risk factor, but so far there's been little evidence to support the idea that it's a cause of disease, rather than just a marker. Genes and their pathways are crucial to our understanding of cardiovascular disease and a better understanding of DDAH-1 could lead to important new treatments. “It could help us to establish if genetic variation predisposes certain people to these diseases, or whether environmental factors exert some of their effects through modulation of DDAH activity. “Our research also shows that this pathway could be harnessed therapeutically to limit production of NO in certain situations where too much nitric oxide is a bad thing; for example, hypotension and septic shock. These are some of the biggest problems in intensive care medicine and there is a huge unmet need for drug treatments.” The study, which was carried out at UCL's Rayne Institute, was funded by grants from the British Heart Foundation, the Wellcome Trust and the Medical Research Council. Professor Jeremy Pearson, Associate Medical Director of the British Heart Foundation, said: "The unexpected finding in the 1980s that a simple gas, nitric oxide (NO), is made by cells in the blood vessel wall and is a powerful control of blood vessel relaxation led to the award of the Nobel Prize in 1998 to its discoverers. "More recently, there has been increasing evidence that impairment of NO production is likely to be an important factor in the development of heart and circulatory disease, but the mechanisms responsible are not fully understood. "This study suggests for the first time that the loss of the activity of the enzyme DDAH-1 leads to reduced NO production and may cause heart and circulatory disease. These findings are likely to be important in the search for new ways to optimise the health of our blood vessels." ### Notes for Editors 1. For more information, please contact Ruth Metcalfe in the UCL Media Relations Office on tel: +44 (0)20 7679 9739, mobile: +44 (0)7990 675 947, out of hours: +44 (0)7917 271 364, e-mail: r.metcalfe@ucl.ac.uk2. 'Disruption of methylarginine metabolism impairs vascular homeostasis' is published in the February issue of the journal Nature Medicine. Advance online publication is embargoed to 18.00 GMT (13.00 US Eastern) Sunday 4 February 2007. Journalists can obtain copies of the paper by contacting the UCL Media Relations Office.3. The study was funded by the British Heart Foundation, the Wellcome Trust and the Medical Research Council. About UCL Founded in 1826, UCL was the first English university established after Oxford and Cambridge, the first to admit students regardless of race, class, religion or gender, and the first to provide systematic teaching of law, architecture and medicine. In the government's most recent Research Assessment Exercise, 59 UCL departments achieved top ratings of 5* and 5, indicating research quality of international excellence. UCL is the fourth-ranked UK university in the 2006 league table of the top 500 world universities produced by the Shanghai Jiao Tong University. UCL alumni include Mahatma Gandhi (Laws 1889, Indian political and spiritual leader); Jonathan Dimbleby (Philosophy 1969, writer and television presenter); Junichiro Koizumi (Economics 1969, Prime Minister of Japan); Lord Woolf (Laws 1954, Lord Chief Justice of England & Wales); Alexander Graham Bell (Phonetics 1860s, inventor of the telephone), and members of the band Coldplay.
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Severely mentally ill have increased risk of death from cardiovascular disease
02-05-2007 · EurekAlert!
A large British study indicates that individuals with severe mental illnesses are significantly more likely to die from coronary heart disease and stroke, but not cancer, than those without mental illnesses, according to a report in the February issue of Archives of General Psychiatry, one of the JAMA/Archives journals.
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Both minor and major ECG abnormalities linked with increased risk of cardiovascular events in women
03-06-2007 · EurekAlert!
Postmenopausal women without symptoms of cardiovascular problems who have minor or major abnormalities on an electrocardiogram are at increased risk for future cardiovascular events and death, according to a study in the March 7 issue of JAMA.
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Panic attacks associated with increased risk of cardiovascular events and death in older women
10-01-2007 · EurekAlert!
Older women who experience at least one full-blown panic attack may have an increased risk of having a heart attack or stroke and an increased risk of death in the next five years, according to a report in the October issue of Archives of General Psychiatry, one of the JAMA/Archives journals.
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Study finds lack of health insurance may be associated with increased rates of stroke
04-02-2007 · EurekAlert!
The lack of health insurance prompts people to forego routine physical exams and have a reduced awareness of cardiovascular risk factors and is associated with increased rates of stroke and death, researchers have concluded.
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Long-term use of diabetes drug increases heart attack risk by more than 40 percent
09-11-2007 · EurekAlert!
An analysis of four studies involving more than 14,000 patients found that long-term use of the diabetes drug rosiglitazone (Avandia) increased the risk of heart attack by 42 percent and doubled the risk of heart failure, according to a new report from researchers at Wake Forest University School of Medicine and colleagues. There was no effect on death from cardiovascular causes.
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Taking AIM at post-stroke depression
02-16-2007 · EurekAlert!
A new straight-forward care management program is significantly more effective than usual care in improving depression in stroke survivors. "Depression after stroke is associated with higher death rates, diminished recovery, increased risk for subsequent stroke and other cardiovascular incidents, and greater health-care utilization," said Dr. Linda Williams, who led the study.
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Statins reduce risk of heart attack and stroke in those without heart disease
11-27-2006 · EurekAlert!
Among individuals without cardiovascular disease, taking statins regularly may reduce the risk of major heart and cerebrovascular events such as heart attack and stroke but not coronary heart disease or overall death, according to a meta-analysis of previously published studies, reported in the November 27 issue of Archives of Internal Medicine, one of the JAMA/Archives journals.
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NHLBI media availability: Overweight girls at risk for cardiovascular disease
01-08-2007 · EurekAlert!
Results from the NHLBI Growth and Health Study of more than 2,300 girls suggest that girls as young as age 9 who are overweight are at increased risk for short-term and long-term problems that increase the chances of developing cardiovascular disease. Those who were overweight were more likely to have elevated blood pressure and cholesterol levels compared to girls who were not overweight. The study also provides insight into differences between African-American and Caucasian girls.
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