From Medicineworld.org: Mysterious multi-symptom condition among Persian Gulf vets
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Mysterious multi-symptom condition among Persian Gulf vets
To be diagnosed with CMI, veterans must have had symptoms for more than six months in two or three of the following categories: fatigue; mood symptoms or difficulty thinking; and muscle or joint pain.
However, the study also found CMI in veterans who did not serve in the gulf, suggesting that the Persian Gulf conflict isn't the only trigger for CMI.
"We're not yet sure whether CMI is due to a single disease or pathological process," says lead author Melvin Blanchard, M.D., associate chief of medicine at the St. Louis Veterans Affairs (VA) Medical Center and assistant professor of medicine at Washington University School of Medicine in St. Louis. "But this study has identified an intriguing association between CMI risk and diagnosis of depression and anxiety disorders previous to military service."
Other findings from the study include:
Among deployed veterans, CMI incidence was 28.9 percent; in non-deployed veterans, it was 15.8 percent.
"A key point is that 10 years after the first Gulf War, CMI was still much more prevalent among deployed than non-deployed veterans," Blanchard says. "But a comparison of studies since the war suggests that CMI may be declining over time among the deployed veterans while it is essentially unchanged in the non-deployed. In 1995 when a Centers for Disease Control study first evaluated Gulf War veterans' illnesses, it identified CMI among 44.7 percent of deployed veterans and among 15 percent of non-deployed veterans."
To help understand the nature of CMI, Blanchard and colleagues reviewed the data looking for associations between CMI and a variety of other medical conditions. Of the conditions associated with CMI, all were based on symptoms rather than examination and laboratory test findings (fibromyalgia syndrome, chronic fatigue syndrome, upset stomach) except metabolic syndrome.
Fibromyalgia syndrome afflicts sufferers with persistent, widespread pain. Chronic fatigue syndrome leaves sufferers with a disabling loss of energy. While acknowledging that these conditions have serious effects on veterans' health and quality of life, Blanchard notes that they are both based on subjective symptom reports from the patient.
Diagnosis of metabolic syndrome, in contrast, is based on patients meeting at least three of five objective criteria: elevated blood pressure; high levels of triglycerides in the blood; low levels of HDL, also known as good cholesterol; elevated levels of blood glucose after fasting; and a large waist size.
In both deployed and non-deployed veterans diagnosed with CMI, the prevalence of metabolic syndrome was twice that of veterans not suffering from CMI. Metabolic syndrome is associated with several-fold risk of death from coronary artery disease.
"Physicians need to be aware of the potential manifestations of CMI and the need to treat them, and metabolic syndrome is a key example," Blanchard says. "There's quite a bit of literature on this condition, and there are steps physicians can encourage their patients to take, such as increased exercise, stress management and dieting to reduce abdominal fat, that can lessen its effects."
In addition, some of the individual health risk components of the metabolic syndrome can be treated with currently available medications.
Scientists also screened for factors previous to time in the service that affected CMI risk, looking at age, race, and other demographic factors, military characteristics, as well as medical and psychiatric history.
"History of psychiatric conditions previous to service appears to place veterans at a significantly increased risk of CMI," Blanchard says. "This should not be taken as an indication that CMI is all in the veteran's head: the condition has physical manifestations that are very real, including objectively defined conditions such as metabolic syndrome."
Blanchard and others suspect CMI may be connected to malfunctions in the body systems that respond to stress, such as the nervous system. Battlefield stress may help trigger the disorder in deployed veterans. Veterans who develop CMI without serving in the field of combat may be responding to other types of life stress, such as divorce, job pressure or a death in the family.
Blanchard currently is conducting a follow up study of 100 individuals with CMI and 100 without CMI. The study includes an extensive evaluation of participants' stress response systems.
Source: Washington University in St.Louis - School of Medicine
Did you know?
Comparing veterans deployed in the first Persian Gulf War and veterans deployed elsewhere at the same time has revealed veterans who served in the Persian Gulf have nearly twice the prevalence of chronic multi-symptom illness (CMI), a cluster of symptoms similar to a set of conditions often called Gulf War Syndrome.
Medicineworld.org: Mysterious multi-symptom condition among Persian Gulf vets
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