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| The practice of modern medicinesources include domestic help, delivery of meals, day-care centres, elderly residential homes or nursing homes, and hospital beds either in general medical wards or in specialized geriatric units. The degree of accessibility" of these services is uneven from country to country and within countries. In the United States, for instance, although there are some federal programs, each state has its own elderly programs, which vary widely. However, as the elderly become an increasingly larger part of the population their voting rights are providing increased leverage for obtaining more federal and state benefits. The general practitioner or family physician working with visiting health and social workers and in conjunction with the patient's family often form a working team for elderly care. In the developing world, countries are largely spared such geriatric problems, but not necessarily for positive reasons. A principal cause, for instance, is that people do not live so long. Another major reason is that in the extended family concept, still prevalent among developing countries, most of the caretaking needs of the elderly are provided by the family. Public health practice. The physician working in the field of public health is mainly concerned with the environmental causes of ill health and in their prevention. Bad drainage, polluted water and atmosphere, noise and smells, infected food had housing, and poverty in general are all his special concern. Perhaps the most descriptive title he can he given is that of community physician. In Britain he has been customarily known as the medical officer of health and. in the United Slates, as the health officer. The spectacular improvement in the expectation of life in the affluent countries has been due far more to public health measures than to curative medicine. These public health measures began operation largely in the 19lh century. At the beginning of that century, drainage and water supply systems were all more or less primitive; nearly all the cities of that time had poorer water and drainage systems than Rome had possessed 1,800 years previously. Infected water supplies caused outbreaks of typhoid, cholera, and other waterborne infections. By the end of the century, at least in the larger cities, water supplies were usually safe. Food-home infections were also drastically reduced by the enforcement of laws concerned with the preparation, storage, and distribution of food. Insect-borne infections, such as malaria and yellow fever, which were common in tropical and semitropical climates, were eliminated by the destruction of the responsible insects. Fundamental to this improvement in health has been the diminution of poverty, for most public health measures are expensive. The peoples of the developing countries fall sick and sometimes die from infections that are virtually unknown in affluent countries. Britain. Public health services in Britain are organized locally under the National Health Service. The medical officer of health is employed by the local council and is the adviser in health matters. The larger councils employ a number of mostly full-time medical officers; in some rural areas, a general practitioner may be employed part-time as medical officer of health: The medical officer has various statutory powers conferred by acts of Parliament, regulations and orders, such as food and drugs acts, milk and dairies regulations, and factories acts. He supervises the work of sanitary inspectors in the control of health nuisances. The compulsorily notifiable infectious diseases are reported to him, and he takes appropriate action. Other concerns of the medical officer include those involved with the work of the district nurse, who carries out nursing duties in the home, and the health visitor, who gives advice on health matters, especially to the mothers of small babies. He has other duties in connection with infant welfare clinics, creches, day and residential nurseries, the examination of schoolchildren, child guidance clinics, foster homes, factories, problem families, and the care of the aged and the handicapped. United States. Federal, state, county, and city governments all have public health futtctions. Under the U.S. Department of Health end Human Services is the Public Health Service, headed by an assistant secretary for health and the surgeon general. State health departments are headed by a commissioner of health, usually a physician, who is often in the governor's cabinet. He usually has a board of health that adopts health regulations and holds hearings on their alleged violations. A state's public health code is the foundation on which all county and city health regulations must be based. A city health department may be independent of its surrounding county health department, or there may be a combined city-county health department. The physicians of the local health departments are usually called health officers, though occasionally people with this title are not physicians. The larger departments may have a public health director, a district health director, or a regional health director. The minimal complement of a local health department is a health officer, a public health nurse, a sanitation expert, and a clerk who is also a registrar of vital statistics. There may also be sanitation personnel, nutritionists, social workers, laboratory technicians, and others. Japan. Japan's Ministry of Health and Welfare directs public health programs at the national level, maintaining close coordination among the fields of preventive medicine, medical care, and welfare and health insurance. The departments of health of the prefectures and of the largest municipalities operate health centres. The integrated community health programs of the centres encompass maternal and child health, communicable- disease control, health education, family planning, health statistics, food inspection, and environmental sanitation. Private physicians, through their local medical associations, help to formulate and execute particular public health programs needed by their localities. Numerous laws are administered through the ministry's bureaus and agencies, which range from public health, environmental sanitation, and medical affairs to the children and families bureau. The various categories of institutions run by the ministry, in addition to the national hospitals, include research centres for cancer and leprosy, homes for the blind, rehabilitation centres, for the physically handicapped, and port quarantine services. Former Soviet Union. In the aftermath of the dissolution of the Soviet Union, responsibility for public health fell to the governments of the successor countries. The public health services for the U.S.S.R. as a whole were directed by the Ministry of Health. The ministry, through the 15 union republic ministries of health, directed all medical institutions within its competence as well as the public health authorities; and services throughout the country. The administration was centralized, with little local autonomy. Each of the 15 republics had its own ministry of health, which was responsible for carrying out the plans and decisions established by the U.S.S.R. Ministry of Health. Each republic was divided into oblasti, or provinces, which had departments of health directly responsible to the republic ministry of health. Each oblast, in turn, had rayony (municipalities), which have their own health departments accountable to the oblast health department. Finally, each rayon was subdivided into smaller uchastoki (districts). In most rural rayony the responsibility for public health lay with the chief physician, who was also medical director of the central rayon hospital. This system ensured unity of public health administration and implementation of the principle of planned development. Other health personnel included nurses, feldshers, and midwives. For more information on the history, organization, and progress of public health, see below. Military practice. The medical services of armies, navies, and air forces are geared to war. During campaigns the first requirement is the prevention of sickness. In all wars before the 20th century, many more combatants died of disease than of wounds. And even in World War II and wars thereafter, although few died of disease, vast numbers became casualties from disease. The main means of preventing sickness are the provision of adequate food and pure water, thus eliminating starvation, avitaminosis, and dysentery and other bowel infections, which used to be particular scourges of armies; the provision of proper clothing and other means of protection from the weather; the elimination from the service of those likely to fall sick: the use of vaccination and suppressive drugs to prevent various infections, such as typhoid and malaria; and education in hygiene and in the prevention of sexually transmitted diseases, a particular problem in the services. In addition, the maintenance of high morale has a sinking effect on casualty rates, for, when morale is poor, soldiers are likely to suffer psychiatric breakdowns, and malingering is more prevalent. The medical branch may provide advice about disease prevention, but the actual execution of this advice is through the ordinary chains of command. It is the duty of the military, not of the medical, officer to ensure that the troops obey orders not to drink infected water and to take tablets to suppress malaria. Army medical organisation. The medical doctor of first contact to the soldier in the armies of developed countries is usually an officer in the medical corps. In реагенте the doctor sees the sick and has functions similar to those of the general practitioner, prescribing drugs and dressings and there may be a sick bay where slightly sick soldiers can remain for a few days. The doctor is usually assisted by trained nurses and corpsmen. If a further medical opinion is required, the patient can be referred to a specialist at a military or civilian hospital. In a war zone, medical officers have an aid post where, with the help of corpsmen, they apply first aid to the walking wounded and to the more seriously wounded who are brought in. The casualties are evacuated as quickly as possible by field ambulances or helicopters. At a company station, medical officers and medical corpsmen may provide further treatment before patients are evacuated to the main dressing station at the field ambulance headquarters, where a surgeon may perform emergency operations. Thereafter, evacuation may be to casualty clearing stations, to advanced hospitals, or to base hospitals. Air evacuation is widely used. In peacetime most of the intermediate medical units exist only in skeleton form; the active units are at the battalion and hospital level. When physicians join the medical corps, they may join with specialist qualifications, or they may obtain such qualifications while in the army. A feature of army medicine is promotion to administrative positions. The commanding officer of a hospital and the medical officer at headquarters may have no contacts with actual patients. Although medical officers in peacetime have some choice of the kind of work they will do, they are in a chain of command and are subject to military discipline. When dealing with patients, however, they are in a special position; they cannot be ordered by a superior officer to give some treatment or take other action that they believe is wrong. Medical officers also do not bear or use arms unless their patients are being attacked. Naval and air force medicine. Naval medical services are run on lines similar to those of the army. Junior medical officers are attached to ships or to shore stations and deal with most cases of sickness in their units. When at sea. medical officers have an exceptional degree of responsibility in that they work alone, unless they are on a very large ship. In peacetime, only the larger ships carry a medical officer; in wartime, destroyers and other small craft may also carry medical officers. Serious cases go to either a shore-based hospital or a hospital ship. Flying has many medical repercussions. Cold, lack of oxygen, and changes of direction at high speed all have important effects on bodily and mental functions. Armies and air forces may share the same medical services. A developing field is aerospace medicine. This involves medical problems that were not experienced before space-flight, for the main reason that humans in space are not under the influence of gravity, a condition that has profound physiological effects. CLINICAL RESEARCH The remarkable developments in medicine that have been brought about in the 20th century, especially since World War II, have been based on research either in the basic sciences related to medicine or in the clinical field. Advances in the use of radiation, nuclear energy, and space research have played an important part in this progress. Some laypersons often think of research as taking place only in sophisticated laboratories or highly specialized institutions where work is devoted to scientific advances that may or may not be applicable to medical practice. This notion, however, ignores the clinical research that takes place on a day-to-day basis in hospitals and doctors' offices. Historical notes. Although the most spectacular changes in the medical scene during the 20lh century, and the most widely heralded, have been the development of potent drugs and elaborate operations, another striking change has been the abandonment of most of the remedies of the past. In the mid-19th century, persons ill with numerous maladies were starved (partially or completely), bled, purged, cupped (by applying a tight- fitting vessel filled with steam to some part and then cooling the vessel), and rested, perhaps for months or even years. Much more recently they were prescribed various restricted diets and were routinely kept in bed for weeks after abdominal operations, for many weeks or months when their hearts were thought to be affected, and for many months or years with tuberculosis. The abandonment of these measures may not be though of as involving research, but the physician who first encouraged persons who had peptic ulcers to eat normally (rather than to live on the customary bland foods) and the physician who first got his patients out of bed a week or two after they had had minor coronary thrombosis (rather than insisting on a minimum of six weeks of strict bed rest) were as much doing research as is the physician who first tries out a new drug on a patient. This research, by observing what happens when remedies are abandoned, has been of inestimable value, and the need for it has not passed. Clinical observation. Much of the investigative clinical field work undertaken in the present day requires only relatively simple laboratory facilities because it is observational rather than experimental in character. A feature of much contemporary medical research is that it requires the collaboration of a number of persons, perhaps not all of them doctors. Despite the advancing technology, there is much to be learned simply from the observation and analysis of the natural history of disease processes as they begin to affect patients, pursue their course, and end, either in their resolution or by the death of the patient. Such studies may be suitably undertaken by physicians working in their offices who are in a better position than doctors working only in hospitals to observe the whole course of an illness. Disease rarely begins in a hospital and usually does not end there. It is notable, however, that observational research is subject to many limitations and pitfalls of interpretation, even when it is carefully planned and meticulously carried out. Drug research. The administration of any medicament, especially a new drug, to a patient is fundamentally an experiment: so is a surgical operation, particularly if it involves a modification to an established technique or a completely new procedure. Concern for the patient, careful observation, accurate recording, and a detached mind are the keys to this kind of investigation, as indeed to all forms of clinical study. Because patients are individuals reacting to a situation in their own different ways, the data obtained in groups of patients may well require statistical analysis for their evaluation and validation. One of the striking characteristics in the medical field in the 20th century has been the development of new drugs, usually by pharmaceutical companies. Until the end of the 19th century, the discovery of new drugs was largely a matter of chance. It was in that period that Paul Ehrlich, the German scientist, began to lay down the principles for modern pharmaceutical research that made possible the development of a vast array of safe and effective drugs. Such benefits, however, bring with them their own disadvantages: it is estimated that as many as 30 percent of patients in, or admitted to, hospitals suffer from the adverse effect of drugs prescribed by a physician for their treatment. Sometimes it is extremely difficult to determine whether a drug has been responsible for some disorder. An example of the difficulty is provided-by the thalidomide disaster between 1959 and 1962. Only after numerous deformed babies had been born throughout the world did it become clear that thalidomide taken by the mother as a sedative had been responsible. In hospitals where clinical research is carried out, ethical committees often consider each research project. If the committee believes that the risks are not justified, the project is rejected. After a potentially useful chemical compound has been identified in the laboratory, it is extensively tested in animals, usually for a period of months or even years. Few drugs make it beyond this point. If the tests are satisfactory, the decision may be made for testing the drug in humans. It is this activity that forms the basis of much clinical research. In most countries the first step is the study of its effects in a small number of health volunteers. The response, effect on metabolism, and possible toxicity are carefully monitored and have to be completely satisfactory before the drug can be passed for further studies, namely with patients who have the disorder for which the drug is to be used. Tests are administered at first to a limited number of these patients to determine effectiveness, proper dosage, and possible adverse reactions. These searching studies are scrupulously controlled under stringent conditions. Larger groups of patients are subsequently involved to gain a wider sampling of the information. Finally, a full-scale clinical trial is set up. If the regulatory authority is satisfied about the drug's quality, safely, and efficacy. it receives a license to be produced. As the drug becomes more widely used, it eventually finds its proper place in therapeutic practice, a process that may take years. An important step forward in clinical research was taken in the mid-20th century with the development of the controlled clinical trial. This sets out to compare two groups of patients, one of which has had some form of treatment that the other group has not. The testing of a new drug is a case in point: one group receives the drug. the her a product identical in appearance, but which is known to be inert—a so-called placebo. At the end of the trial, the results of which can be assessed in various ways, it can be determined whether or not the drug is effective and safe. By the same technique two treatments can be compared, for example a new drug against a more familiar one. Because individuals differ physiologically and psychologically, the allocation of patients between the two groups must be made in a random fashion; some method independent of human choice must be used so that such differences are distributed equally between the two groups. In order to reduce bias and make the trial as objective as possible the double-blind technique is sometimes used. In this procedure, neither the doctor nor the patients know which of two treatments is being given. Despite such precautions the results of such trials can be prejudiced, so that rigorous statistical analysis is required. It is obvious that many ethical, not to say legal, considerations arise, and it is essential that all patients have given their informed consent to be included. Difficulties arise when patients are unconscious, mentally confused, or otherwise unable to give their informed consent. Children present a special difficulty because not all laws agree that parents can legally commit a child to an experimental procedure. Trials, and indeed all forms of clinical research that involve patients, must often be submitted to a committee set up locally to scrutinize each proposal. Surgery. In drug research the essential steps are taken by the chemists who synthesize or isolate new drugs in the laboratory; clinicians play only a subsidiary part. In developing new surgical operations clinicians play a more important role, though laboratory scientists and others in the background may also contribute largely. Many new operations have been made possible by advances in anesthesia, and these in turn depend upon engineers who have devised machines and chemists who have produced new drugs. Other operations are made possible by new materials, such as the alloys and plastics that are used to make .artificial hip and knee joints. Whenever practicable, new operations are tried on animals before they are tried on patients. This practice is particularly relevant to organ transplants. Surgeons themselves—not experimental physiologists—transplanted kidneys, livers, and hearts in animals before attempting these procedures on patients. Experiments on animals are of limited value, however, because animals do not suffer from all of the same maladies as do humans. Many other developments in modem surgical treatment rest on a firm basis of experimentation, often first in animals but also in humans; among them are renal dialysis (the artificial kidney), arterial bypass operations, embryo implantation, and exchange transfusions. These treatments are but a few of the more dramatic of a large range of therapeutic measures that have not only provided patients with new therapies but also have led to the acquisition of new knowledge of how the body works. Among the research projects of the late 20th century is that of gene transplantation, which has the potential of providing cures for cancer and other diseases. SCREENING PROCEDURES Developments in modem medical science have made it possible to detect morbid conditions before a person actually feels the effects of the condition. Examples arc many: they include certain forms of cancer; high blood pressure; heart and lung disease; various familial and congenital conditions; disorders of metabolism, like diabetes; and acquired immune deficiency syndrome (AIDS), the consideration to be made in screening is whether or not such potential patients should be identified by periodic examinations. To do so is to imply that the subjects should be made aware of their condition and, second, that there are effective measures that can be taken to prevent their condition, if they test positive, from worsening. Such so-called specific screening procedures are costly since they involve large numbers of people. Screening may lead to a change in the life-style of many persons, but not all such moves have been shown in the long run to be fully effective. Although screening clinics may not be run by doctors, they are a factor of increasing importance in the, preventive health service. Periodic general medical examination of various sections of the population, business executives for example, is another way of identifying risk factors that, if not corrected, can lead to the development of overt disease. |
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