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People admitted to the hospital on the weekend after an out-of-hospital cardiac arrest are less likely to survive than people admitted on a weekday, according to new research.

A fuzzy logic approach to analyzing water quality could help reduce the number of people in the developing world forced to drink polluted and diseased water for survival.

Patients with pain caused by narrowed arteries in their legs have 37 percent more pain-free walking if they take naftidrofuryl (200 mg three times a day) than those taking placebos, a Cochrane Review has found. In addition, 55 percent of patients taking naftidrofuryl improved, while only 30 percent of people on placebo treatments improved. Naftidrofuryl is used to treat circulatory problems.

A new study in mice indicates that overeating, rather than the obesity it causes, is the trigger for developing metabolic syndrome, a collection of heath risk factors that increases an individual's chances of developing insulin resistance, fatty liver, heart disease and type 2 diabetes.

When it comes to remembering things, new research shows men are more likely than women to have mild cognitive impairment, the transition stage before dementia.

Researchers at Scottsdale Healthcare and TGen have announced the results of two clinical trials that show promise for patients battling two types of cancer: basal cell carcinoma and pancreatic cancer.

Increasing the brain level of receptors for dopamine, a pleasure-related chemical, can reduce use of cocaine by 75 percent in rats trained to self-administer it. Earlier research had similar findings for alcohol intake. Treatments that increase levels of these chemicals -- dopamine D2 receptors -- may prove useful in treating addiction.

Researchers induced stress in 148 patients with coronary artery disease by asking them to speak in public. Those with a particular gene variation were three times more likely to experience dangerous decreases in blood flow to the heart during stress.

Each winter, strains of influenza A virus infect North Americans, causing an average of 36,000 deaths. Now, researchers say the virus comes from a viral reservoir somewhere in the tropics, settling a key debate on the source of each season's infection. "We now know where the influenza A virus comes from every year," said a biologist involved with the research. "And because we now know how the virus evolves, we have a much better chance of controlling it."

Researchers are directing the body's immune system to shrink tumors and prevent new ones from forming. New research details how cellular strategies and new vaccines are changing the cancer treatment landscape.