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CHICAGO — A groundbreaking study of 1,946 male veterans of World War II and Korea suggests that vets with symptoms of post-traumatic stress disorder are at greater risk of heart attacks as they age.

The new study is the first to document a link between PTSD symptoms and future heart disease, and joins existing evidence that vets with PTSD also have more autoimmune diseases such as arthritis and psoriasis.

A second study, funded by the Army, found that soldiers returning from combat in Iraq with post-traumatic stress disorder reported worse physical health, more doctor visits and more missed workdays. The Army study is based on a survey of 2,863 soldiers one year after combat.

"The burden of war may be even greater than people think," said the first study's lead author, Laura Kubzansky of the Harvard School of Public Health, who studies anxiety, depression and anger as risk factors for heart disease. Her work, with colleagues from Harvard and Boston University, appears in this week's issue of the Archives of General Psychiatry.

Their study was funded by the National Institutes of Health and the Department of Veterans Affairs. The Army study appears in this week's American Journal of Psychiatry.

Medical authorities first accepted post-traumatic stress disorder as a psychiatric condition in 1980 at the urging of Vietnam veterans.

In PTSD, the body's normal hormonal response to stress becomes trigger-happy, scientists believe. Long after traumatic events, people remain edgy, fearful and prone to nightmares and flashbacks. The continual release of adrenaline prompted by these symptoms may wear down the cardiovascular system, Kubzansky said.

"It's not enough to simply welcome them home and do some immediate evaluation or help with reintegration," she said. "They need to be tracked and watched carefully."

The Harvard and Boston University researchers analyzed data from the Veterans Administration Normative Aging Study, a long-term research project tracking Boston-area vets.

They looked at health records of men who completed either a 46-item questionnaire measuring PTSD symptoms in 1986, or a different 35-item PTSD assessment in 1990. Both questionnaires are recognized tools for diagnosing PTSD and ask about symptoms such as sleep problems, nightmares, numbness, a heightened sense of being on guard and intrusive memories of traumatic events.