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Researchers have linked blood stored in banks for at least two weeks to in patients who receive it through transfusions. Viagra information at the [viagra information] recent american college of chest physicians conference, researchers said people who receive blood stored in banks for 29 days or longer are twice as likely to contract an infection. Patients infected by old blood developed pneumonia, upper respiratory infections and sepsis. In every case used to develop this link, the oldest blood carried the highest risk of infection. Federal law allows blood to be stored up to 42 days, after which it must be discarded. ScienceDaily. com quoted a researcher as saying: “Stored red blood cells undergo changes that promote the release of a number of biochemical substances called cytokines, which can depress the recipients’ immune function and leave them more susceptible to infection, ” said study author Raquel Nahra viagra information, MD, who conducted viagra information her research while at Cooper University Hospital, Camden, NJ. “Those changes start around 14 days of storage and reach a maximum after the blood is discarded at 42 days. ” Old blood contains higher levels of cytokines, which cause infections. The believed average age of blood used in U. S. transfusions is 17 days old. However, researchers averaged 26 days' old blood when conducting the study. In their four-year study of more than 400 patients, researchers said nearly 14 percent of patients receiving old blood developed an infection. Eleven percent of patients died during the study. Despite damning evidence against old blood, federal officials and industry leaders believe lowering the maximum life of stored blood would create a worldwide shortage.


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