Symptom factor analysis, clinical findings, and functional status in a population-based case control study of Gulf War unexplained illness.

Few epidemiological studies have been conducted that have incorporated clinical evaluations of Gulf War veterans with unexplained health symptoms and healthy controls. We conducted a mail survey of 2022 Gulf War veterans residing in the northwest United States and clinical examinations on a subset of 443 responders who seemed to have unexplained health symptoms or were healthy. Few clinical differences were found between cases and controls. The most frequent unexplained symptoms were cognitive/psychological, but significant overlap existed with musculoskeletal and fatigue symptoms. Over half of the veterans with unexplained musculoskeletal pain met the criteria for fibromyalgia, and a significant portion of the veterans with unexplained fatigue met the criteria for chronic fatigue syndrome. Similarities were found in the clinical interpretation of unexplained illness in this population and statistical factor analysis performed by this study group and others.

Self-reported exposures and their association with unexplained illness in a population-based case-control study of Gulf War veterans.

Many factors have been considered as possible causes of the unexplained illness reported by veterans of the Gulf War (GW). In this study, we report an analysis of risk factors and unexplained illness in a population-based sample of GW veterans who underwent clinical evaluation. Multiple risk factors were compared in 241 veterans who met criteria for unexplained illness and 113 healthy controls. Results suggest that GW unexplained illness is most highly associated with combat conditions, heat stress, and having sought medical attention during the GW. When controlling for multiple simultaneous exposures during the GW, interactions around pyridostigmine bromide, insecticides and repellents, and stress were not significant. These results indicate that most unexplained illness in GW veterans cannot be explained by neurotoxic effects of exposures to chemicals that inhibit cholinesterase activity.

Physician expressions of uncertainty during patient encounters.

Uncertainty is inherent in clinical medicine and may contribute to variability in physician practice patterns, patient satisfaction, and exchange of information. However, research on physician disclosure of uncertainty to patients is sparse. We measured the frequency of physician expressions of uncertainty to patients using audiotapes of visits to 43 physicians by 216 continuity patients in a university-affiliated general medicine clinic. We also analyzed the audiotapes using Roter Interaction Analysis. Physicians completed Gerrity's Physician's Reaction to Uncertainty scale and patients completed the Kranz Health Opinion Survey and a standardized satisfaction questionnaire. Physicians made verbal expressions of uncertainty in 71% of clinic visits. Physicians with greater self-rated reluctance to disclose uncertainty to patients made fewer expressions. Physicians who made more uncertainty expressions also used more positive talk and partnership building, and gave more information to patients. Physicians also expressed more uncertainty to patients with more education, greater desire for information, and more questions. Physician uncertainty expression were associated with greater patient satisfaction, but not independently of other physician verbal behaviors that were also associated with satisfaction.

Strategies to assess validity of self-reported exposures during the Persian Gulf War. Portland Environmental Hazards Research Center.

Research in the area of Persian Gulf War Unexplained Illnesses (PGWUI) is heavily dependent on self-reports of exposures. The Portland Environmental Hazards Research Center (PEHRC) conducted a population-based case-control study utilizing techniques to measure the magnitude of potential error in self-reports of exposure. While it is impossible to verify most exposures in the Persian Gulf War (PGW), results of our study reveal significant overreporting of exposures that can be verified based on the time period served in the Persian Gulf. Test-retest reliability estimates indicate inconsistency in frequency and rate of self-reported exposures during the PGW. Unexplained illness in PGW veterans has received much political and scientific attention. Self-reported exposures in surveys returned preceding and following media reports on particular exposure such as nerve gas or pesticides are presented. These results are useful in the interpretation of findings related to the PGWUI and in the design of future investigations.

Gulf War unexplained illnesses: persistence and unexplained nature of self-reported symptoms.

Most published reports of health symptoms among Gulf War (GW) veterans have been based on self-reported questionnaire data. The presence of these symptoms at the time of a clinical evaluation and the unexplained nature of the symptoms have not been described. We report the findings of a sample of symptomatic veterans that were examined as part of a population-based case-control study of GW unexplained illnesses. Participants in the case-control study were selected from responders to a cross-sectional survey of a random sample of GW veterans residing in the northwestern United States. The initial survey questionnaire solicited information on the presence of fatigue and psychological/cognitive, gastrointestinal, musculoskeletal, and dermatological problems. The persistence of the symptoms and possible explanatory diagnoses were explored at the time of the clinical evaluation. Findings from the first 225 participants who completed clinical examinations indicate significant differences between self-reported symptoms on the survey questionnaire and those confirmed at the time of clinical exam. The agreement between symptoms reported both on the survey and at the time of examination varies across the symptom groups. While self-reported unexplained fatigue was confirmed at the time of clinical encounter in 79% of participants, self-reported gastrointestinal symptoms were confirmed at the clinical encounter in only 20% of participants. Differences between symptoms reported on the survey questionnaire and those confirmed at the time of clinical encounter were attributable to finding a clinical diagnosis for the symptom, resolution of symptom(s) between time of questionnaire and clinical exam, and inadvertent endorsement of the symptom on the questionnaire. These findings suggest that due to the possibility of outcome misclassification, inappropriate conclusions may be drawn about the association between exposures and unexplained illnesses in GW veterans from data derived solely from self-administered questionnaires.

U.S. Gulf War Veterans: service periods in theater, differential exposures, and persistent unexplained illness. Portland Environmental Hazards Research Centre.

Approximately 80,000 of the 697,000 American men and women who were stationed in SW Asia during the Gulf War (GW) report unexplained illness consisting of symptoms of persistent fatigue, cognitive difficulties, such as mild memory loss, diffuse muscle and joint pain, gastrointestinal symptoms, skin lesions, and respiratory problems, among others. Associations between major symptom groups and periods of deployment in the theater of operations have been sought in a population-based, clinical case-control study of GW veterans resident in the north-western region of the United States. No statistically significant differences were evident in the proportion of cases with unexplained fatigue, cognitive/psychological or musculoskeletal symptoms among veterans present in SW Asia in 3 specific time periods: (a) 8/1/1990-12/31/1990 (which includes Desert Shield), (b) the period surrounding Desert Storm (1/1/1991-3/31/1991), and (c) the (post-combat) period immediately following hostilities (4/1/1991-7/31/1991). There was a trend for all 3 case symptoms to be more common among GW veterans who served in the post-combat period. As numbers in these deployment groups were small, and power to detect differences low, the apparent absence of significant differences in the frequency of major symptom groups among these veterans requires confirmation in a larger study. Deployment for discrete periods in SW Asia is a method to separate distinct constellations of environmental factors; these are useful for analyses of associations among symptoms and exposures given the near-total absence of objective data on chemical and other possible exposures in the theater of operations.

Use of the diagnosis "failure to thrive" in older veterans.

OBJECTIVES: To describe how physicians apply the term "failure to thrive" (FTT) to older patients. Specifically, to describe the clinical presentation, underlying etiologies, diagnostic and therapeutic interventions, and discharge outcomes of veterans having the discharge diagnosis of FTT. DESIGN: Retrospective chart review. SETTING: The Department of Veterans Affairs Medical Center (VAMC), Portland, Oregon, a 400-bed referral and teaching hospital. PARTICIPANTS: All veterans 65 years of age and older admitted to the Portland VAMC from October 1, 1990, through September 30, 1993, whose coded discharge diagnoses included FTT (n = 132). MEASUREMENTS: Medical records were reviewed by a trained abstractor to obtain key data about clinical presentation, etiologies, interventions, and discharge outcomes. RESULTS: Subjects were predominantly male (98%), with a mean age of 76 years +/- 9 years. Weight loss was a key feature: 67% of subjects had evidence of weight loss by study criteria. Anemia was present in 55%, low cholesterol in 50%, and low albumin in 44%. Lymphopenia was common, present in 66% of subjects. Most patients were admitted from home (83%); only 7% came from nursing homes. On admission, the majority (82%) were dependent in at least one ADL, and 36% were cognitively impaired. Cancer was the most common underlying diagnosis (30%), followed by infection (18%), dehydration (13%), and depression (12%). Only 46% of subjects were discharged home, while 34% went to nursing homes. Fourteen percent of subjects died during the hospitalization, an additional 11% died within 30 days after discharge, and 32% died within 1 year after discharge. The subgroup of subjects with cancer and/or infection had increased mortality rates at 30 days and 1 year after hospitalization. CONCLUSION: We conclude that FTT may constitute a discrete syndrome with diagnostic, therapeutic and prognostic implications in older people, but in the absence of consensus about diagnostic criteria, there is a large degree of subjective variation in how physicians apply the term.

Teaching headache management to medicine residents.

BACKGROUND: To evaluate the effect of teaching headache management to PG-1 medicine residents. DESIGN: Observational study using prerotation and postrotation ratings by residents of improvement in their knowledge of etiology, diagnosis, appropriate use of narcotics, and treatment of headache. SETTING: Veterans Affairs Outpatient Clinic. PARTICIPANTS: Twenty-two medicine residents. MEASUREMENTS AND RESULTS: There was small but significant improvement in the total knowledge score (P = .03) and in areas of etiology of headache (P = .02) and appropriate use of narcotics (P = .001). CONCLUSION: We found there were substantial increases in residents subjective levels of understanding, history-taking and in the diagnosis and treatment of headache (P < .0001) in contrast to the objective knowledge test.

Effects of a physician communication intervention on patient care outcomes.

OBJECTIVE: To determine whether an intervention designed to improve patient-physician communication increases the frequency with which physicians elicit patients' concerns, changes other communication behaviors, and improves health care outcomes. DESIGN: Pretest-posttest design with random assignment of physicians to intervention or control groups. SETTING: General medicine clinics of a university-affiliated Veterans Affairs Hospital. PATIENTS/PARTICIPANTS: Forty-two physicians and 348 continuity care patients taking prescription medications for chronic medical conditions. INTERVENTIONS: Intervention group physicians received 4.5 hours of training on eliciting and responding to patients' concerns and requests, and their patients filled out the Patient Requests for Services Questionnaire prior to a subsequent clinic visit. Control group physicians received 4.5 hours of training in medical decision-making. MEASUREMENTS AND MAIN RESULTS: The frequency with which physicians elicited all of a patient's concerns increased in the intervention group as compared with the control group (p = .032). Patients perceptions of the amount of information received from the physician did increase significantly (p < .05), but the actual magnitude of change was small. A measure of patient satisfaction with the physicians was high at baseline and also showed no significant change after the intervention. Likewise, the intervention was not associated with changes in patient compliance with medications or appointments, nor were there any effects on outpatient utilization. CONCLUSIONS: A low-intensity intervention changed physician behavior but had no effect on patient outcomes such as satisfaction, compliance, or utilization. Interventions may need to focus on physicians and patients to have the greatest effect.

Patients' desires and satisfaction in general medicine clinics.

Most patients have explicit desires or requests when they visit their physicians. Identification of patients' requests and needs is the starting point of a patient-centered approach to care. The frequency with which physicians met their patients' desires for services and that frequency's association with patient satisfaction were examined for 243 patients with chronic disease in general medicine clinics of a Department of Veterans Affairs hospital. Patients desired a mean of 11.9 services, of which an average of 67 percent were met. However, many patients' desires for information and most of their desires for help with emotional and family problems were not met. Patients with the most unmet desires for services, especially services related to information, were significantly less satisfied with their physicians than were those with fewer unmet desires. Factor analysis was used to develop a short, 16-item Requests for Services Questionnaire that appeared to cover the range of services that patients with chronic conditions desire. Enhancing physicians' ability to recognize and respond to patients' desires for services by using short patient request questionnaires may have the potential to improve patient satisfaction and other health care outcomes.

Outpatients' attitudes and understanding regarding living wills.

OBJECTIVE: To assess outpatients' attitudes toward and understanding of a standard living will. DESIGN: Survey using a self-administered questionnaire that patients completed after they had read a sample living will. SETTING: General medicine clinic of a Department of Veterans Affairs medical center. PATIENTS: Two hundred fourteen patients (85% of those approached) attending a continuity care clinic appointment. Eighty-seven percent were men; mean age was 60 years. MEASUREMENTS AND MAIN RESULTS: Patients' attitudes toward living wills, understanding of the terminology contained in living wills, desire to discuss living wills with their doctors, and desire to prepare a living will. RESULTS: Seventy-two percent of the patients had prior knowledge of living wills, though only 53% had discussed the topic with family members and only 14% with physicians. Half felt that the living will terminology should be simplified, and 55% were unable to identify the correct definition for at least one commonly used term. Desire to prepare a living will was positively associated with better understanding of the sample document and previous knowledge of and exposure to living wills, and was negatively associated with concern about its use and revocability (all p < 0.001). Patients who reported poor understanding of the living will were more likely to want to discuss the topic with a physician (p < 0.01). CONCLUSIONS: In this ambulatory patient population attitudes toward living wills were influenced by knowledge and understanding of these documents. Primary care physicians and institutions should develop patient education strategies that enhance understanding of advance directives.

A health survey of Klamath Indian elders 30 years after the loss of tribal status.

Federal recognition of the tribal status of the Klamath Indians of Oregon was terminated by Congress in 1954, along with all health, education, and welfare services. In the winter and spring of 1985 a health status and health care needs assessment was conducted among 202 Klamath Indians ages 40 years and older with the use of a shortened version of the Older Americans Resources and Services (OARS) instrument. Twenty percent of the Klamaths surveyed reported having diabetes, and more than 30 percent reported having arthritis, rheumatism, or hypertension, or having had their gallbladder removed. The data were compared with those of national surveys of Indian and non-Indian elders that also used the OARS instrument. Even though the Klamaths surveyed were younger than the comparison groups, their health status was no better than that of other Indians and was worse than that of the non-Indian population. Moreover, among these Klamath adults, health insurance coverage was lower, and perceived unmet needs for medical care were higher than in either of the comparison groups.

Centralized obesity and cardiovascular disease risk in Mexican Americans.

The association between body fat distribution patterns and cardiovascular disease risk variables (high density lipoprotein (HDL) cholesterol, total cholesterol, diastolic and systolic blood pressures, and fasting blood glucose levels) was sought in a sample of Mexican American adults who were studied during 1981-1983 in Starr County, Texas. In the sample, all diabetics were excluded to see whether centralized obesity carried any risk for cardiovascular disease independent of diabetes. A component of centralized body fat distribution was identified through the use of principal components analysis of five skinfold measurements, which included the upper and lower extremities and trunk areas. The centralized obese were compared with generalized (peripheral) obese and nonobese controls in four subgroups of the population: younger and older adult males and females. The means of all cardiovascular risk variables were in a direction indicating that the centralized obese were significantly at greater risk than nonobese controls (in particular, HDL cholesterol, total cholesterol, and blood glucose levels). The generalized obese differed from the centralized obese in having significantly lower blood glucose levels, and tended to be intermediate between centralized obese and nonobese controls in the other variables. The data confirm that centralized obesity as defined by a linear combination of skinfold measures works in the same way as the waist-to-hip circumference ratio in describing a body build factor which heightens the risk of cardiovascular disease in the obese independent of the clinical diabetic state.

Android (centralized) obesity and somatotypes in men: association with mesomorphy.

The relationship between body fat distribution patterns and somatotype among 824 men was sought from Sheldon, Dupertuis and MacDermott's Atlas of Men (1954). The men were classified photoscopically into obese, overweight and normal weight classes and then into android (central), intermediate and gynoid (generalized) classes of body fat patterning independently and blindly by two observers. Android fat men were found by both observers to be older and more often classed as obese than gynoid fat men. The android obese were significantly more mesomorphic and less endomorphic than the gynoid obese (P less than 0.01). Results suggest that android obesity involves more than an upper body distribution of subcutaneous fat: it is a deep body obesity involving excess lean body mass as well.

Alternative measurements of obesity: accuracy of body silhouettes and reported weights and heights in a Mexican American sample.

The assessment of obesity by anthropometry or body composition in studies of chronic disease epidemiology is not always feasible. In this paper we test the accuracy and validity of two alternative methods: body silhouettes and reported weights and heights in a sample of Mexican American adults (n = 166) participating in the Diabetes Alert Study. The body silhouettes were those developed by A. Stunkard and colleagues. We compared the silhouettes obtained independently by three different observers, one with minimal experience in assessing obesity, the other two skilled in anthropometry. Correlations between the expert observers were 0.89-0.90. Those between the expert and less skilled observers were lower (0.64 to 0.85) and were better for female than male subjects. Results suggest an acceptable level of precision for persons with some training in obesity assessment. Body silhouettes compared well with the body mass index (r = 0.85 to 0.92 for the expert vs r = 0.65 to 0.84 for the less skilled observer), being higher for female subjects. The body silhouettes are thus useful for categorizing normal, overweight and obese individuals. The poorer performance on male subjects may relate to the female-like obesity depicted in both sexes in this particular set of silhouettes. A substantial proportion of subjects could not recall their weight or height. For those who could recall their measurements, accuracy was good but measurement error higher than that for measured variables. These problems of recall in this sample from rural Texas point to the potential usefulness of the body silhouette method when actual height and weight measurements cannot be made.

The Diabetes Alert study: growth, fatness, and fat patterning, adolescence through adulthood in Mexican Americans.

Diabetes Alert is a multidisciplinary genetic and epidemiological study of Type II (non insulin-dependent) diabetes in Texas Mexican Americans. We report the anthropometry of 1,155 individuals 10 to 70 or more years with particular reference to overweight, fatness, and anatomical fat patterning in the sample. Children ages 10-18 of both sexes are growing at the 50th percentile of the reference data (U.S. Health and Nutrition Examination Survey-1) for height, Wt/Ht2, and triceps and subscapular skinfolds. Adults are well below median height but well above median Wt/Ht2 and skinfolds. Prevalence of obesity (Wt/Ht2 greater than or equal to 30) among adults is typically 30% or higher by age 30. Diabetics compared to age/sex-matched non diabetics have shorter sitting heights, have more upper body fat (subscapular skinfold), have less lower body fat (lateral calf skinfold), and were heavier at maximum weight and at age 18. The ratio of lower to upper body fat distribution decreases over the life cycle, being highest at adolescence and lowest at ages 40-50 in both sexes. Our results show a precipitous weight gain after maturity in the sample and an association of diabetes with differences in anatomical fat patterning. The age-related changes in fat patterning need to be explained in terms of their ecological and genetic influences.

Diabetes alert study: weight history and upper body obesity in diabetic and non-diabetic Mexican American adults.

History of adult weight gain and fat patterning is compared in Mexican American diabetics and age and sex matched non-diabetics. Diabetics differed little from non-diabetics in overall body fatness at the time of the examination. However, history of adult weight gain and current fat patterning were very different. Diabetics were heavier than non-diabetics at age 18. They subsequently gained weight faster and attained a substantially higher weight, at an earlier age, than non-diabetics. Discriminant function analysis was used to test for differences in patterning. Diabetics tend to have more trunk fat, as reflected particularly in the subscapular skinfold, and less lower extremity (leg) fat. Fat patterning in this population does not appear to be influenced by age when weight gain occurred, but is related to diabetic status, especially in women.

The Bacon Chow study: maternal nutritional supplementation and infant behavioral development.

The effect of maternal nutritional supplementation during pregnancy and lactation on the mental and motor development of infants was studied in a rural population in Taiwan. Women were randomly assigned to 2 treatment groups: 1 received a high-calorie and protein supplement ("supplement" group); the other received a placebo ("control" group). Infants received no direct supplementation. At approximately 8 months of age, the mental and motor development of the infants was assessed using a research to maternal supplementation in either scale, nor were the mental scale scores of infants of supplement mothers significantly higher than infants of control mothers. However, the motor scores of supplement infants were higher than those of control infants, which is consistent with the findings of 2 other large-scale nutritional supplementation studies.

PIP: The effect of maternal nutritional supplementation during pregnancy and lactation on the mental and motor development of infants was studied in a rural population in Taiwan. Women were randomly assigned to 2 treatment groups; 1 received a high calorie and protein supplement (supplement group) and the other received a placebo (control group). Infants received no direct supplementation. At approximately 8 months of age, the mental and motor development of the infants was assessed using a research version of the Bayley Scales of Infant Development. There were no sex differences in response to maternal supplementation in either scale, nor were the mental scale scores of infants of supplement mothers significantly higher than infants of controls. However, the motor scores of supplement infants were higher than those of control infants, which is consistent with the findings of 2 other largescale nutritional supplementation studies.