Re-Analysis Of Published Studies Shows Little Evidence Of Stress As Cause Of Gulf War Syndrome

November 03, 1997

DALLAS Careful re-examination of reports of stress in veterans reveals little or no support for the theory that symptoms reported in Gulf War Syndrome are stress-related, a UT Southwestern Medical Center at Dallas researcher has reported in the November American Journal of Epidemiology.

Dr. Robert Haley reviewed the 16 studies cited in the January 1997 report of the Presidential Advisory Committee on Gulf War Illnesses, as well as three more recent studies, and found that the data suggested that the prevalence of post-traumatic stress disorder (PTSD) among Gulf War veterans was very low. This casts serious doubt on the conclusions of the committee, which blamed stress as an important contributing factor for Gulf War veterans' illnesses.

"My analysis shows these studies over-interpreted minimal elevations of scores on nonspecific psychological tests used to screen for PTSD, and virtually all of what appeared to be stress actually can be explained as falsely positive errors of measurement," said Haley, UT Southwestern's chief of epidemiology. "Properly interpreted, these studies show that the true rate of PTSD among the veterans is near zero."

Haley said the problem is not that PTSD is difficult to diagnose; a trained psychologist or psychiatrist can readily make the diagnosis following a structured interview for the established criteria. He found that the studies relied on psychological screening questionnaires known to be prone to misdiagnosing PTSD in people suffering from a wide range of other conditions, and the studies failed to follow-up their preliminary findings with evidence using definitive diagnostic interview techniques.

He concluded that the President's special advisory committee did not appreciate that there could be systematic errors in interpretation of the 16 studies it cited, and prematurely accepted the theory that stress caused the chronic symptoms suffered by many Gulf War veterans.

"Once we and others pointed out problems with the idea that PTSD was common in Gulf War veterans, the committee did not consider the emerging evidence for other causes but instead changed its definition of stress from PTSD to general life stress," Haley said. "The view that general life stress plays an important causal role in chronic illnesses, such as sustained hypertension, fibromyalgia and chronic fatigue syndrome, is a theoretical and popular concept, but it is not supported by the preponderance of scientific evidence."

Haley cited this example: Stomach ulcers once were widely thought to be caused by stress but now are known to be caused by chronic infection, which can be cured by antibiotics.

PTSD is the only chronic illness officially recognized to result from emotionally traumatic experiences, such as those encountered in military deployment and combat, Haley said.

In January, the Journal of the American Medical Association published three papers byHaley and a team of UT Southwestern researchers who found that the mysterious symptoms of some Gulf War veterans were associated with evidence of brain and nerve damage from wartime exposure to combinations of chemicals. In August, the Archives of Clinical Neuropsychology published results of UT Southwestern's comparison of ill and well veterans, which further linked veterans' mysterious symptoms with brain and nerve damage and ruled out PTSD and other psychological causes.

The UT Southwestern researchers recently received $3 million from the U.S. Department of Defense to expand their study to compare brain and nerve damage in ill and well Gulf War veterans, to identify a cost-effective method of screening for and diagnosing the damage, and to test possible treatments.
-end-


UT Southwestern Medical Center

Related Stress Articles from Brightsurf:

Stress-free gel
Researchers at The University of Tokyo studied a new mechanism of gelation using colloidal particles.

Early life stress is associated with youth-onset depression for some types of stress but not others
Examining the association between eight different types of early life stress (ELS) and youth-onset depression, a study in JAACAP, published by Elsevier, reports that individuals exposed to ELS were more likely to develop a major depressive disorder (MDD) in childhood or adolescence than individuals who had not been exposed to ELS.

Red light for stress
Researchers from the Institute of Industrial Science at The University of Tokyo have created a biphasic luminescent material that changes color when exposed to mechanical stress.

How do our cells respond to stress?
Molecular biologists reverse-engineer a complex cellular structure that is associated with neurodegenerative diseases such as ALS

How stress remodels the brain
Stress restructures the brain by halting the production of crucial ion channel proteins, according to research in mice recently published in JNeurosci.

Why stress doesn't always cause depression
Rats susceptible to anhedonia, a core symptom of depression, possess more serotonin neurons after being exposed to chronic stress, but the effect can be reversed through amygdala activation, according to new research in JNeurosci.

How plants handle stress
Plants get stressed too. Drought or too much salt disrupt their physiology.

Stress in the powerhouse of the cell
University of Freiburg researchers discover a new principle -- how cells protect themselves from mitochondrial defects.

Measuring stress around cells
Tissues and organs in the human body are shaped through forces generated by cells, that push and pull, to ''sculpt'' biological structures.

Cellular stress at the movies
For the first time, biological imaging experts have used a custom fluorescence microscope and a novel antibody tagging tool to watch living cells undergoing stress.

Read More: Stress News and Stress Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.