Clinical ecology was the name given by proponents in the 1960s to a claim that exposure to low levels of certain chemical agents harm susceptible people, causing multiple chemical sensitivity and other disorders. Clinical ecologists are people that support and promote this offshoot of conventional medicine. [1] They often have a background in the field of allergy or otorhinolaryngology, and the theoretical approach is derived in part from classic concepts of allergic responses, first articulated by Theron Randolph and developed by Richard Mackarness. [2]
Clinical ecologists support a cause-and-effect relationship for non-specific symptoms reported by some people after low-dose exposure to chemical, biologic, or physical agents. This pattern of low-dose reaction is not generally accepted by toxicologists. [1] Although some of the mainstream medical community continue to reject these claims, the concept is gaining some recognition under the modern and more clearly articulated classification of environmental medicine. [3] [4]
"Clinical Ecologist" is an environmental approach that is consistent with the practice of holistic medicine. Practitioners with this orientation do not use the term "Clinical Ecologist," although those opposed to this complementary medicine approach to illness often still do. Unlike terms such as physician or nurse, the term clinical ecologist is not legally regulated in any jurisdiction, which means that any person may legally claim to be a clinical ecologist. If wanted, they may obtain an extralegal certification or membership from the unregulated private organization American Academy of Environmental Medicine upon payment of a fee. [1] [5]
Many clinical ecologists are traditionally licensed healthcare professionals who hold advanced traditional medical certifications. Others may have a more alternative training. [ citation needed ]
Randolph published a number of books to promote clinical ecology and environmental medicine, including:
In 1965, Randolph founded the Society for Clinical Ecology as an organization to promote his theories based on the symptoms of his patients, known as multiple chemical sensitivities (MCS).
During the 1980s the movement was rejected by some medical organizations and judges, [1] and health insurance companies often refused to pay their bills. The society's name was changed from the Society for Clinical Ecology, according to its opponents, in order to flee from its bad reputation. [3]
Despite the confusion in the traditional medical establishment regarding the classification and treatment of MCS, MCS has achieved credibility in workers compensation claims, tort liability, and regulatory actions. The pragmatic determination of MCS includes four elements: (1) the syndrome is acquired after a documentable environmental exposure that may have caused objective evidence of health effects; (2) the symptoms are referable to multiple organ systems and vary predictably in response to environmental stimuli; (3) the symptoms occur in relation to measurable levels of chemicals, but the levels are below those known to harm health; and (4) no objective evidence of organ damage can be found. [6]
Randolph's theories about chemical effects have been criticized by toxicologists. His broader interpretation of "allergies" beyond that of IgE antibodies in true allergy conflicted with traditional allergists of his time. Of course, Randolph did not claim that environmental sensitivities were "true allergies" mediated by IgE, claiming this fine point was irrelevant to people suffering from non-allergic sensitivities. The turf war waged by allergists and defense expert witnesses during those years also has less relevance today than it once did. Several National Academy of Sciences workshops and Research Councils into Gulf War syndrome have validated the idiosyncratic effect low chemical exposure on sensitized individuals.[ citation needed ]
Clinical ecology is not a recognized medical specialty. [7] Practitioners have been criticized for tricking mentally ill and suggestible patients into thinking that they were chemically sensitive. [3] Twentieth century critics of clinical ecology charged that multiple chemical sensitivity (MCS) had never been clearly defined, no scientifically plausible mechanism has been proposed for it, no diagnostic tests have been substantiated, and not a single case has been scientifically proven. Well-conducted studies establishing the theories and practices of clinical ecology were not found in reviews of evidence supporting its practices by the American Medical Association in 1992, [8] the American College of Physicians in 1989, [9] the Canadian Psychiatric Association, the International Society of Regulatory Toxicology and Pharmacology in 1993, [10] the American Academy of Allergy, Asthma and Immunology, [11] and more recently by the American College of Occupational and Environmental Medicine in 1999. [12]
The development of GMO food and the increased use of herbicides on food crops has resulted in an increased interest in the area of environmental sensitivities. A polarized debate has grown between supporters of the new agri-technology who characterize themselves as rational scientists and opponents as ignorant alarmists. On the other hand, the opponents characterize the supporters as dogmatic industry shills and themselves as critical thinkers and environmentalists. Both groups claim to be the majority opinion, although the only consensus that has weight is within the government organizations that rule on safety. At issue is the non-industry science that characterizes herbicides and the genetically engineered pesticides of GMO crops as endocrine disruptors. That disruption also triggers autoimmune system responses consistent with those observed by clinical ecologists.[ citation needed ]
Toxicology is a scientific discipline, overlapping with biology, chemistry, pharmacology, and medicine, that involves the study of the adverse effects of chemical substances on living organisms and the practice of diagnosing and treating exposures to toxins and toxicants. The relationship between dose and its effects on the exposed organism is of high significance in toxicology. Factors that influence chemical toxicity include the dosage, duration of exposure, route of exposure, species, age, sex, and environment. Toxicologists are experts on poisons and poisoning. There is a movement for evidence-based toxicology as part of the larger movement towards evidence-based practices. Toxicology is currently contributing to the field of cancer research, since some toxins can be used as drugs for killing tumor cells. One prime example of this is ribosome-inactivating proteins, tested in the treatment of leukemia.
Allergies, also known as allergic diseases, are various conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis. Symptoms may include red eyes, an itchy rash, sneezing, coughing, a runny nose, shortness of breath, or swelling. Note that food intolerances and food poisoning are separate conditions.
Multiple chemical sensitivity (MCS), also known as idiopathic environmental intolerances (IEI), is an unrecognized and controversial diagnosis characterized by chronic symptoms attributed to exposure to low levels of commonly used chemicals. Symptoms are typically vague and non-specific. They may include fatigue, headaches, nausea, and dizziness.
A pesticide poisoning occurs when pesticides, chemicals intended to control a pest, affect non-target organisms such as humans, wildlife, plants, or bees. There are three types of pesticide poisoning. The first of the three is a single and short-term very high level of exposure which can be experienced by individuals who commit suicide, as well as pesticide formulators. The second type of poisoning is long-term high-level exposure, which can occur in pesticide formulators and manufacturers. The third type of poisoning is a long-term low-level exposure, which individuals are exposed to from sources such as pesticide residues in food as well as contact with pesticide residues in the air, water, soil, sediment, food materials, plants and animals.
Environmental medicine is a multidisciplinary field involving medicine, environmental science, chemistry and others, overlapping with environmental pathology. It can be viewed as the medical branch of the broader field of environmental health. The scope of this field involves studying the interactions between environment and human health, and the role of the environment in causing or mediating disease. This specialist field of study developed after the realisation that health is more widely and dramatically affected by environmental factors than previously recognized.
Theron Grant Randolph was a physician, allergist, and researcher from the United States. He studied food allergies, chemical sensitivities, and preventive care. Randolph, along with some other American allergists, objected to the definition of allergies as arising from serological abnormalities; this definition, common among European allergists of Randolph's day, excluded from consideration the kinds of non-immunological adverse environmental reactions that Randolph studied.
Dichlorvos is an organophosphate widely used as an insecticide to control household pests, in public health, and protecting stored products from insects. The compound has been commercially available since 1961 and has become controversial because of its prevalence in urban waterways and the fact that its toxicity extends well beyond insects. Since 1988, dichlorvos cannot be used as a plant protection product in the EU.
Occupational asthma is new onset asthma or the recurrence of previously quiescent asthma directly caused by exposure to an agent at workplace. It is an occupational lung disease and a type of work-related asthma. Agents that can induce occupational asthma can be grouped into sensitizers and irritants.
Medical toxicology is a subspecialty of medicine focusing on toxicology and providing the diagnosis, management, and prevention of poisoning and other adverse effects due to medications, occupational and environmental toxicants, and biological agents. Medical toxicologists are involved in the assessment and treatment of a wide variety of problems, including acute or chronic poisoning, adverse drug reactions (ADRs), drug overdoses, envenomations, substance abuse, industrial accidents, and other chemical exposures.
The Hazardous Substances Data Bank (HSDB) was a toxicology database on the U.S. National Library of Medicine's (NLM) Toxicology Data Network (TOXNET). It focused on the toxicology of potentially hazardous chemicals, and included information on human exposure, industrial hygiene, emergency handling procedures, environmental fate, regulatory requirements, and related areas. All data were referenced and derived from a core set of books, government documents, technical reports, and selected primary journal literature. Prior to 2020, all entries were peer-reviewed by a Scientific Review Panel (SRP), members of which represented a spectrum of professions and interests. Last Chairs of the SRP are Dr. Marcel J. Cassavant, MD, Toxicology Group, and Dr. Roland Everett Langford, PhD, Environmental Fate Group. The SRP was terminated due to budget cuts and realignment of the NLM.
In analytical chemistry, biomonitoring is the measurement of the body burden of toxic chemical compounds, elements, or their metabolites, in biological substances. Often, these measurements are done in blood and urine. Biomonitoring is performed in both environmental health, and in occupational safety and health as a means of exposure assessment and workplace health surveillance.
The American Academy of Environmental Medicine (AAEM), founded in 1965 as the Society for Clinical Ecology, is an international association of physicians and associated professionals interested in the clinical aspects of ecological or environmental illnesses, which is called clinical ecology. The academy aims for recognition of ecologic illness as a medical diagnosis.
Mirosław Jan Stasik is a Polish medical doctor and research toxicologist.
Wang Aiping is a Chinese pharmacologist and toxicologist. For over 20 years, Wang has researched drug and toxicity testing and has experience in new drug development. Since 2001, he has been Director of Drug Safety Evaluation and Research at the Academy of Medical Sciences, Peking Union Medical College and was also made General Manager of Technological development at Peking Union Medical College's Jianhao Pharmaceutical Technology Development Co., Ltd.
Claudia S. Miller, an allergist and immunologist, is an author, instructor, and scientist noted for research in chemical intolerance, and development of tools for its diagnosis. Miller is a professor of occupational and environmental medicine in the School of Medicine at the University of Texas Health Science Center at San Antonio. She also is assistant dean for the school's M.D.-M.P.H. program, and vice chair of community medicine in the school's Department of Family and Community Medicine.
Jeffrey A. Brent is a medical toxicologist who is a distinguished clinical professor of medicine and emergency medicine at the University of Colorado, School of Medicine. In addition, he is a professor at the Department of Environmental and Occupational Health at the Colorado School of Public Health. He is also the past president of the American Academy of Clinical Toxicology, was editor in chief of the journal Toxicological Reviews, and was a member of the board of directors of the American College of Medical Toxicology. Previously, most of Brent's research focused on the use of fomepizole as a treatment for both methanol and ethylene glycol poisoning, and he led a trial of this drug which resulted in the FDA approving it in December 1997. Currently, Brent serves as Director of the Toxicology Investigators Consortium, an NIH and FDA supported multi center research and surveillance group. Brent is also a senior editor of "Critical Care Toxicology: Diagnosis and Management of the Critically Poisoned Patient," originally published in 2005, and now in its second edition, which was published in 2017.
Sibte Hasan Zaidi was an Indian pathologist and toxicologist. After his training in pathology at the Hammersmith Hospital in London, United Kingdom, he returned to India to continue experimental toxicology research. During his later years, he served on national and international committees, such as the World Health Organization, to advise on the harmful biological effects of industrial toxins.
Guy Richard Godfrey Mackarness was a British psychiatrist and low-carbohydrate diet writer. He is best known for his book Eat Fat and Grow Slim, published in 1958. Mackarness was an early advocate of the Paleolithic diet and authored books on food allergies.
The American Board of Applied Toxicology (ABAT) was established in 1985 as a standing committee by the American Academy of Clinical Toxicology. The board functions to recognize and credential clinical toxicologists who have demonstrated competence in the management of toxicity related to poisoning, overdose, chemical exposure, envenomation, or environmental exposures. Candidates for board certification are health professionals with minimum perquisite experience in poisoning and overdose management as well as satisfactory experience in other core areas such as toxicology research, public health, and outreach. The ABAT establishes minimum competency for clinical toxicologists via administering examinations and maintaining certification renewal of diplomates. Successfully passing the ABAT board certification exam provides the taker a designation of Diplomate of the American Board of Applied Toxicology (DABAT). A DABAT designation privileges the clinical toxicologist to provide medical back up and consultation on poisoning, drug overdoses, or toxicity, often via poison centers. The DABAT designation also has legal implication in allowing credentialed toxicologists to manage a poison center in the United States. Credentialed DABAT members must recertify every 5 years via an application demonstrating continued competence and activity in clinical toxicology.