![]() Yet these cardiovascular consequences are believed to be linked to the way non-O blood types coagulate, which did not seem to contribute to the cognitive effects described in the new study. The seemingly surprising result has some precedent: past studies suggest non-O blood types are linked to elevated incidence of heart disease, stroke and blood clots-vascular conditions that could affect brain function. The finding was published online last September in Neurology. When they compared that cognitively declining group with 587 participants whose mental muster remained robust, researchers found that impairment in thinking was roughly 82 percent more likely in individuals with AB blood type than in those with A, B or O blood types, even after taking their race, sex and geography into account. The researchers zeroed in on 495 individuals who showed significant declines on at least two of the three phone survey tests. Cushman's team focused on information collected twice yearly via phone surveys that evaluate cognitive skills such as learning, short-term memory and executive function. The aim of the study is to understand the heavy stroke toll seen in the southeastern U.S., particularly among African-Americans. ![]() University of Vermont hematologist Mary Cushman and her colleagues used data from a national study called REGARDS, which has been following 30,239 African-American and Caucasian individuals older than 45 since 2007. People with the rare AB blood type, present in less than 10 percent of the population, have a higher than usual risk of cognitive problems as they age. For additional information visit Linking to and Using Content from MedlinePlus.Blood type may affect brain function as we age, according to a new large, long-term study. Any duplication or distribution of the information contained herein is strictly prohibited without authorization. Links to other sites are provided for information only - they do not constitute endorsements of those other sites. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. This site complies with the HONcode standard for trustworthy health information: verify here. Learn more about A.D.A.M.'s editorial policy editorial process and privacy policy. is among the first to achieve this important distinction for online health information and services. ![]() follows rigorous standards of quality and accountability. is accredited by URAC, for Health Content Provider (URAC's accreditation program is an independent audit to verify that A.D.A.M. This is because special immune globulins called RhoGAM are routinely used.Ī.D.A.M., Inc. This problem has become less common in places that provide good prenatal care. Rh incompatibility develops only when the mother is Rh-negative and the infant is Rh-positive. All children she has later who are also Rh-positive may be affected. This is because it takes time for the mother to develop antibodies. The level of bilirubin in the infant's blood may range from mild to dangerously high.įirstborn infants are often not affected unless the mother had past miscarriages or abortions. This causes an infant to become yellow (jaundiced). When red blood cells are broken down, they make bilirubin. ![]() They destroy the baby's circulating red blood cells. These antibodies may cross back through the placenta into the developing baby. The mother's body makes antibodies against the fetal blood cells. If the mother is Rh-negative, her immune system treats Rh-positive fetal cells as if they were a foreign substance. During pregnancy, red blood cells from the unborn baby can cross into the mother's blood through the placenta. ![]()
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