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The environment was right for Nova Scotia's new environmental health clinic.

With a $1-million contribution from the Nova Scotia government, Dalhousie University medical school is establishing an environmental health clinic that will research and treat the controversial condition known as multiple-chemical sensitivity. Already several hundred Nova Scotians, including about 100 former employees of Halifax's Camp Hill Hospital, have been referred to a part-time clinic that addresses environmental illness and other unexplained conditions. Some physicians contend that the sensitivity is largely psychosomatic and treatments provide little more than a placebo effect, but proponents believe research will support environmental health's goal of becoming a new, recognized speciality.

Adult↗

Hypersensitivity of human subjects to environmental electric and magnetic field exposure: a review of the literature.

Hypersensitivity to exposure to electric and magnetic fields (EMFs) has been reported for nearly 20 years; however, the literature on the subject is still very limited. Nearly all the literature published concerns a dermatological syndrome that consists of mainly subjective symptoms (itching, burning, dryness) and a few objective symptoms (redness, dryness) appearing after individuals begin working with video display units and decreasing during absence from work. Case-control studies as well as some good but limited double-blind trials have not found any clear relationship between this syndrome and exposure to EMFs. A "general syndrome" with more general symptoms has been rarely described but seems to have a worse prognosis. The symptoms often associated with skin disorders are mainly of neurasthenic type and can cover a lot of nonspecific symptoms present in other atypical syndromes such as multiple chemical sensitivity or chronic fatigue. Most of these symptoms are allegedly triggered by exposure to different sources of EMFs, but there have been no valid etiological studies published on this more general syndrome. It appears that the so-called hypersensitivity to environmental electric and magnetic fields is an unclear health problem whose nature has yet to be determined.

Case-Control Studies↗

Neuropsychological approaches for the detection and evaluation of toxic symptoms.

The purpose of this paper is 3-fold: a) to review briefly the neuropsychological tests that have been used to evaluate the effects of neurotoxicants; b) to identify individual factors that may create heightened sensitivity to neurotoxicants; and c) to discuss test parameters that will increase the sensitivity of neuropsychological tests for detecting symptoms in low-level exposure situations. While the body of literature on neurobehavioral toxicology has increased dramatically during the past 10 years, it remains difficult to discern which tests are most effective in detecting behavioral effects even among workers with significant exposures. Few investigators have evaluated the interactions between individual differences, such as gender and psychiatric function, and exposure to neurotoxicants. Detection of behavioral performance decrements among uniquely susceptible populations such as those with sensitivities to low-level exposures (e.g., multiple chemical sensitivities) will require more difficult tests than are frequently used in current neuropsychological test batteries.

Cognition Disorders↗

The role of environmental factors in medically unexplained symptoms and related syndromes: conference summary and recommendations.

This monograph of peer-reviewed articles is based on presentations at the conference "Environmental Factors in Medically Unexplained Physical Symptoms and Related Syndromes" held 10-12 January 2001 in Piscataway, New Jersey, USA. The purpose of the conference was to determine research priorities for elucidating the role of environmental factors in medically unexplained symptoms and symptom syndromes. These include conditions such as chronic fatigue syndrome, multiple chemical sensitivities, sick building syndrome, Gulf War illness, and the like. Approximately 1 1/2 days were devoted to plenary talks and 1 day was devoted to break-out sessions to discuss epidemiologic, psychosocial, and experimental research. Recommendations were made for a series of epidemiologic, psychosocial, and experimental research approaches, with acknowledgment that nosology issues are clearly fundamental to advancing understanding of these conditions.

Environmental Exposure↗

Repeated low level formaldehyde exposure produces enhanced fear conditioning to odor in male, but not female, rats.

Multiple chemical sensitivity (MCS) is an ill-defined disorder in humans attributed to exposure to volatile organic compounds. This study draws on apparent parallels between individuals with posttraumatic stress disorder (PTSD) and panic disorder and a subset of those reporting MCS, using a conditioned fear task in rats. Male and female Sprague-Dawley rats were given repeated exposure to 2 ppm formaldehyde (Form) (1 h/day x 5 days/week x 4 week) or air, and after 2-3 weeks, rats were trained on the conditioned fear task. One half of Air and Form rats were given odor (orange oil, the conditioned stimulus, CS) paired with footshock (PRD) and the other half was given the same stimuli in an unpaired manner (UNP). After 24 h, rats were placed into the same context without the CS or footshock. Male and female PRD groups demonstrated contextual freezing 5-15% of the time, while the UNP groups showed freezing 30-50% of the time, with no effect of Air or Form pretreatment. For the next 5 days, rats were placed into a novel context and tested for freezing in the absence or presence of the CS. In male rats, Form pretreatment produced a significantly greater freezing response in both UNP and PRD groups in the presence of the CS, with no differences in freezing in the absence of the CS. In female rats, no significant differences between Form pretreated rats and Air controls were observed in either the PRD or UNP groups. The increase in conditioned fear responding to the CS after Form exposure in males suggests that repeated low-level Form may act as a stressor to produce sensitized responding within olfactory/limbic pathways, and may help explain the panic-like responses observed in a subset of individuals reporting MCS. Furthermore, the male/female differences suggest a gonadal hormonal contribution to this behavior.

Analysis of Variance↗

Serum neopterin and somatization in women with chemical intolerance, depressives, and normals.

The symptom of intolerance to low levels of environmental chemicals (CI, chemical intolerance) is a feature of several controversial polysymptomatic conditions that overlap symptomatically with depression and somatization, i.e., chronic fatigue syndrome, fibromyalgia, multiple chemical sensitivity, and Persian Gulf syndrome. These syndromes can involve many somatic symptoms consistent with possible inflammation. Immunological or neurogenic triggering might account for such inflammation. Serum neopterin, which has an inverse relationship with l-tryptophan availability, may offer a marker of inflammation and macrophage/monocyte activation. This study compared middle-aged women with CI (who had high levels of affective distress; n = 14), depressives without CI (n = 10), and normals (n = 11). Groups did not differ in 4 p.m. resting levels of serum neopterin. However, the CI alone had strong positive correlations between neopterin and all of the scales measuring somatization. These preliminary findings suggest the need for additional research on biological correlates of 'unexplained' multiple somatic symptoms in subtypes of apparent somatizing disorders.

Adult↗

Evidence for overlap between idiopathic environmental intolerance and somatoform disorders.

OBJECTIVE: Idiopathic environmental intolerance (IEI), also known as multiple chemical sensitivity, is a chronic, polysymptomatic condition that cannot be explained by an organic disease. Physical and psychological complaints are believed to be sustained by low levels of chemically unrelated substances in the environment. At present, it is unclear whether IEI is an environmental illness or a variant of somatoform disorders (SFD). This study examined whether IEI can be distinguished from SFD with respect to self-reported symptoms, trait anxiety, body-related cognitions, and symptom attributions. METHODS: We compared 54 subjects with IEI, 54 subjects with SFD but without IEI, and 44 subjects with neither IEI nor SFD on symptom scales, psychological questionnaires, and structured interviews for IEI, depression, anxiety, and SFD. RESULTS: More than half of the IEI subjects met Diagnostic and Statistical Manual of Mental Disorders, fourth edition criteria of SFD. This group shared both symptoms and psychological features of somatization with the SFD group. IEI subjects who did not fulfill criteria for a specific SFD were less impaired by their chemical sensitivity but differed nevertheless from nonsomatoform controls by significantly higher symptom scores, higher trait anxiety, a focus on autonomic sensations, and more pronounced somatic symptom attributions. These psychological features were significantly associated with the burden of somatic symptoms in both SFD and IEI. Furthermore, self-reported allergy but not total immunoglobulin E correlated with symptom burden in the total sample. CONCLUSIONS: The similarity of IEI and SFD regarding symptoms and psychological features of somatization support the hypothesis that IEI is a variant of SFD.

Adult↗

Neuropsychological evaluation for detecting alterations in the central nervous system after chemical exposure.

Individuals with multiple chemical sensitivity (MCS) report decreased attention/concentration, memory loss, disorientation, confusion, fatigue, depression, irritability, decreased libido, sleep disturbances, headaches, and weakness. These neurobehavioral symptoms represent possible alterations in the central nervous system (CNS). The evaluation of neurobehavioral functioning using neuropsychological techniques provides an indirect method for determining the integrity of the CNS. However, caution must be used in interpreting neuropsychological test results, since this technique is extremely sensitive but is not specific. Clinically significant aberrant test performance may be noted after chemical exposure as well as with other diseases of the CNS. In addition, neuropsychiatric conditions such as anxiety and depression are often manifested as cognitive difficulties that are similar in pattern to the cognitive dysfunction caused by toxic chemicals. Herein, limitations and cautions in the interpretations of neuropsychological test results are discussed.

Anxiety↗

Environmental factors in medically unexplained symptoms and related syndromes: the evidence and the challenge.

Symptoms, and especially those without clear underlying medical explanations, account for a large percentage of clinical encounters. Many unexplained symptoms have been organized by patients and practitioners into syndromes such as chronic fatigue syndrome, multiple chemical sensitivity, sick building syndrome, Gulf War syndrome, and the like. All these syndromes are defined solely on the basis of symptoms rather than by medical signs. Some of the above-described conditions overlap strongly with explained conditions such as asthma. The relationship of such symptoms and syndromes to environmental exposure is often sharply debated, as is the distinction between the various syndromes. This leads to problems of what type of research should be conducted and who should conduct it. It is time to develop a comprehensive research agenda to sort out nomenclature, epidemiology, and environmental causation for these conditions, moving toward comprehensive and effective public health and clinical approaches.

Environmental Health↗

[Recent advances in environmental toxicology].

Among the sanitary effects of environmental chemicals, 3 examples illustrate the complexity of the issues to be solved: 1. endocrine disrupters, xenobiotics which interfere with hormonal systems, could increase the risk of reproductive and developmental disturbances and explain the rising incidence of hormone-dependent cancers; 2. multiple chemical sensitivity due to odorous chemicals has severe social consequences and warrants further research; 3. the reappearance of well-known poisoning cases and the emergent new toxic diseases due to substitutive products for solvents, cooling agents and spray propellants banned for ecological purpose, demonstrate the need for surveillance programmes of industrial and household products.

Air Pollutants↗

Simple chemiluminescence assays for free radicals in venous blood and serum samples: results in atopic, psoriasis, MCS and cancer patients.

OBJECTIVE: To investigate the generation of reactive oxygen species (ROS) in serum and venous blood as well as the serum antioxidative activity (AOA) in patients and healthy controls by means of a simplified chemiluminescence (CL) methodology. STUDY PARTICIPANTS: 48 Atopic eczema, 23 psoriasis, 15 multiple chemical sensitivity (MCS) and 35 cancer patients together with 22 healthy volunteers. METHODS: ROS generation/photon emission in blood and serum samples under basal conditions and after light exposure as well as the AOA of the serum samples was investigated at room temperature (22 degrees C) in all 143 fasted subjects. The 3-step methodology resumes in adding a constant amount of blood or serum to a constant amount of CL substrate (or to an ROS-generating mixture for the AOA test), followed by a short preincubation and registration of the photon counts over a 600-second time interval. RESULTS: In the basal and light exposure tests significantly higher photon counts (> 14, 000 counts/600 s) were registered in venous blood in all patient groups when compared to healthy controls (p < 0.001), suggesting increased amounts of activated leukocytes and light-sensitizing compounds, respectively. By contrast, most patient sera showed in all three CL tests a strongly inhibited light emission (p < 0.005), suggesting an adaptive antioxidative response to oxidant stress factors. CONCLUSIONS: Atopic, psoriasis, MCS and cancer patients are exhibiting significantly changed blood and serum CL patterns when compared to healthy controls. The described assays are simple, well reproducible and enable a fast assessment of ROS generation and AOA in biological samples at low operational costs.

Calibration↗

Environmental psychosomatics--an integrative model.

Patients presenting with new clinical syndromes such as multiple chemical sensitivities (MCS) or other environmental illnesses confront us with the necessity to have valid models of how psychological, environmental, social and biological factors interact with each other. Whilst MCS is influenced by psychiatric and psychological factors, the scientific evidence does not allow to regard MCS as a psychiatric disorder only. Objective environmental factors have to be taken into account as well. As causation of MCS seems to be very complex, a complex model is needed to integrate the various pathogenetical factors. After reviewing the psychiatric research findings on MCS, such a model is introduced in the paper; it is called the dialectical model of environmental psychosomatics. This model has implications for further research and clinical practice; it advocates a process of simultaneous diagnostic processes covering biological environmental analysis as well as psychiatric diagnostics.

Environment↗

Illnesses you have to fight to get: facts as forces in uncertain, emergent illnesses.

Chronic fatigue syndrome and multiple chemical sensitivity are two clusters of illnesses that are pervaded by medical, social and political uncertainty. This article examines how facts are talked about and experienced in struggles over these emergent, contested illnesses in the US. Based principally on a large archive of internet newsgroup postings, and also on fieldwork and on published debates, it finds that (1) sufferers describe their experiences of being denied healthcare and legitimacy through bureaucratic categories of exclusion as dependent upon their lack of biological facts; (2) institutions manage these exclusions rhetorically through exploiting the open-endedness of science to deny efficacy to new facts; (3) collective patient action responds by archiving the systematic nature of these exclusions and developing counter-tactics. The result is the maintenance of these very expensive struggles for all involved.

Fatigue Syndrome, Chronic↗

Evaluation and management of medically unexplained physical symptoms.

BACKGROUND: Medically unexplained physical symptoms (MUPS) and related syndromes are common in medical care and the general population, are associated with extensive morbidity, and have a large impact on functioning. Much of medical practice emphasizes specific pharmacological and surgical intervention for discrete disease states. Medical science, with its emphasis on identifying etiologically meaningful diseases comprised of homogeneous groups of patients, has split MUPS into a number of diagnostic entities or syndromes, each with its own hypothesized pathogenesis. However, research suggests these syndromes may be more similar than different, sharing extensive phenomenological overlap and similar risk factors, treatments, associated morbidities, and prognoses. Examples of syndromes consisting of MUPS include chronic fatigue syndrome, fibromyalgia, multiple chemical sensitivities, somatoform disorders, and 'Gulf War Syndrome.' REVIEW SUMMARY: This paper is a narrative review of the increasing body of evidence suggesting that MUPS and related syndromes are common, disabling, and costly. It emphasizes that MUPS occur along a continuum of symptom count, severity, and duration and may be divided into acute, subacute (or recurrent), and chronic types. Predisposing, precipitating, and perpetuating factors influence the natural history of MUPS. CONCLUSIONS: Effective symptom management involves collaborative doctor-patient approaches for identification of problems based on a combination of medical importance and patient readiness to initiate behavioral change, negotiated treatment goals and outcomes, gradual physical activation and exercise prescription. Additionally, efforts should be made to teach and support active rather than passive coping with the symptoms.

Combined Modality Therapy↗

A review of the evidence for overlap among unexplained clinical conditions.

PURPOSE: Unexplained clinical conditions share features, including symptoms (fatigue, pain), disability out of proportion to physical examination findings, inconsistent demonstration of laboratory abnormalities, and an association with "stress" and psychosocial factors. This literature review examines the nature and extent of the overlap among these unexplained clinical conditions and the limitations of previous research. DATA SOURCES: English-language articles were identified by a search of the MEDLINE database from 1966 to January 2001 by using individual syndromes and their hallmark symptoms as search terms. STUDY SELECTION: Studies that assessed patients with at least one unexplained clinical condition and that included information on symptoms, overlap with other unexplained clinical conditions, or physiologic markers. Conditions examined were the chronic fatigue syndrome, fibromyalgia, the irritable bowel syndrome, multiple chemical sensitivity, temporomandibular disorder, tension headache, interstitial cystitis, and the postconcussion syndrome. DATA EXTRACTION: Information on authorship, patient and control groups, eligibility criteria, case definitions, study methods, and major findings. DATA SYNTHESIS: Many similarities were apparent in case definition and symptoms, and the proportion of patients with one unexplained clinical condition meeting criteria for a second unexplained condition was striking. Tender points on physical examination and decreased pain threshold and tolerance were the most frequent and consistent objective findings. A major shortcoming of all proposed explanatory models is their inability to account for the occurrence of unexplained clinical conditions in many affected patients. CONCLUSIONS: Overlap between unexplained clinical conditions is substantial. Most studies are limited by methodologic problems, such as case definition and the selection and recruitment of case-patients and controls.

Brain Concussion↗

New aspects of psychiatric morbidity in idiopathic environmental intolerances.

OBJECTIVE: To understand idiopathic environmental intolerances (IEI)-formerly multiple chemical sensitivities (MCS)-it is helpful to outline its characteristic psychiatric morbidity. METHOD: We applied a standardized interview according to the Diagnostic and Statistical Manual of Mental Disorders, 4th Edition (SCID) to 305 environmental patients with and without IEI. RESULTS: Somatoform, affective and anxiety disorders were the most frequent diagnoses but only slightly differed between patients with or without IEI. In both groups, current substance-related disorders were rare. We found a clearly higher prevalence of psychotic, especially current delusional disorders, in IEI. CONCLUSION: Somatization, depression, and anxiety are frequent in IEI but nonspecific. Psychotic disorders are more common in IEI than in other types of environmental illness. It appears worthwhile to study personality and cognitive style to explain the pivotal features of IEI.

Adolescent↗

Hazards in the radiology department.

OBJECTIVE: This article views, collectively, the problems associated with darkroom disease, multiple chemical sensitivity and latex allergy. Each is discussed individually to establish a case definition. METHOD: Common threads and similarities are identified among the 3 conditions along with potential sources. RESULTS: A model is proposed to change attitudes among radiographers in individual departments to improve workplace safety. CONCLUSION: We propose the use of an established health education/disease prevention model to change the attitudes of radiographers toward chemical threats.

Aldehydes↗

Patient activism and the struggle for diagnosis: Gulf War illnesses and other medically unexplained physical symptoms in the US.

We examine Gulf War illnesses--which include the fatigue, joint pain, dermatitis, headaches, memory loss, blurred vision, diarrhea, and other symptoms reported by Gulf War veterans--in relation to other medically unexplained physical symptoms such as multiple chemical sensitivity, chronic fatigue syndrome, and fibromyalgia. Our intent is to examine the diagnosis negotiations involved in these mysterious diseases, by showing the different forms of legitimacy involved in such interactions. Factors involved in diagnostic legitimacy are: diagnostic legitimacy in the medical community, lay acceptance of the diagnosis, uncertainty in looking for causes, and social mobilization. We conclude by noting that research may not be able to find any cause for these diseases/conditions; hence, it may be necessary to embrace medical uncertainty, and also to accept patient experience in order to facilitate diagnosis, treatment, and recovery process. Such a change can alter patients' expectations and taken-for-granted assumptions about medicine, and perhaps in turn reduce the frequency with which dissatisfied individuals form illness groups that mobilize to challenge what they see as an unresponsive medical system.

Attitude of Health Personnel↗