Biomedical subjects
A B Zwi
Publications and source records attributed to A B Zwi.
Commentary: life in the real world is more complicated.
Explore the source record for details and available documents.
Using capture-recapture in promoting public health.
Explore the source record for details and available documents.
Patterns of injury in children and adolescents presenting to a South African township health centre.
OBJECTIVES: To describe the patterns and causes of childhood injury presenting to a South African township health centre in 1991. DESIGN: Retrospective review of clinic held case notes. SETTING: Typical South-African urban township within Greater Johannesburg. SUBJECTS: 695 subjects aged 0-19 years presenting as a direct result of injury. RESULTS: Overall rates of presentation for injury were 6297/100,000/year (95% confidence interval 5463 to 7131); 35% of injuries were caused by violence, 14% by traffic, and 51% by other unintentional causes (such as falls and sport injuries). Males had higher rates of presentation than females for violent (p < 0.001) and unintentional injuries (p < 0.01), but rates were similar for traffic injuries. The highest rates were for injuries caused by violence in 15-19 year-old males and were 9319/100,000/year. CONCLUSIONS: Rates are lower than in more developed countries. However, they appear to represent the more severe end of the spectrum of injury severity. The rates are similar for those below age 10 years and higher for those above age 10 years compared with severe injury rates in other studies. These data are likely to underestimate true rates. The risk of injuries caused by violence increase with age and these injuries are more serious than those due to other causes. Males are at higher risk for all types of injury except traffic injury.
Traffic-related mortality in industrialized and less developed countries.
Road traffic-related mortality has traditionally been regarded as a problem primarily of industrialized countries. There is, however, growing evidence of a strong negative relationship between economic development and exposure-adjusted traffic-related death rates. Cross-sectional data on road traffic-related deaths in 1990 were obtained from 83 countries. The relationship between such mortality and a number of independent variables was examined at the individual country level by means of multiple regression techniques. These were also used to elucidate factors associated with variations in age, sex, and case-fatality patterns of road traffic mortality. Countries were grouped according to region and socioeconomic features, and the mortality data were summarized by these groups. The gross national product per capita was positively correlated with traffic-related mortality/100,000 population/year (P = 0.01), but negatively correlated with traffic deaths/1000 registered vehicles (P < 0.0001). Increasing population density was associated with a proportionately greater number of traffic-related deaths in the young and the elderly (P = 0.036). Increasing GNP per capita and increased proportional spending on health care were associated with decreasing case-fatality rates among traffic-accident victims (P = 0.02 and 0.017, respectively). Middle-income countries appear to have, on average, the largest road-traffic mortality burden. After adjusting for motor vehicle numbers, however, the poorest countries show the highest road traffic-related mortality rates. Many industrialized countries would appear to have introduced interventions that reduce the incidence of road traffic injury, and improve the survival of those injured. A major public health challenge is to utilize this experience to avoid the predicted increase in traffic-related mortality in less developed countries.
Violence against women: a neglected public health issue in less developed countries.
Violence against women is a significant public health issue in countries of both the industrialized and less developed world. This paper describes the magnitude and health consequences of domestic violence and rape, with an emphasis on developing countries; it recognizes, however, that there is a dearth of documentation regarding the wide range of activity opposing violence against women which is taking place in less developed countries. It briefly explores the factors that perpetuate violence against women and the strategies that have evolved to respond to the problem. It analyses the constellation of factors that may assist violence to emerge as a legitimate public health concern, and explores opportunities and obstacles to further progress in this field. Particular attention is devoted to the role of research in the policy-making process; research areas which may assist those opposing violence against women in all its forms are tentatively suggested.
The introverted medical school--time to rethink medical education.
Curricular reform in the education of medical students is highlighted within the context of changing patterns of provision of health care. A number of industrialised countries' medical schools have accepted that they have a 'social contract' to respond to the health needs of the populations they serve. Such a contract, and the commitment to populations which it would necessitate, is also relevant in the South African context.
Reassessing priorities: identifying the determinants of HIV transmission.
Explore the source record for details and available documents.
Military expenditure and foreign aid: should they be linked?
Explore the source record for details and available documents.
Identifying "high risk situations" for preventing AIDS.
Explore the source record for details and available documents.
Mesothelioma in South Africa, 1976-84: incidence and case characteristics.
Malignant mesothelioma is a rare tumour known to be associated with prior exposure to asbestos. Previous studies have described the occupational and clinical features of cases of mesothelioma in the Republic of South Africa (RSA) but none has set out to determine incidence of this disease. To estimate incidence, a case register was compiled for 1976-84 by contacting all medical practitioners and institutions likely to have seen cases of mesothelioma in this period; demographic, diagnostic and exposure details were sought. Cases were accepted if they provided evidence of histological diagnosis of mesothelioma. Fifty-two per cent of 1347 cases identified were in whites, 31% in blacks, 16% in coloureds and 1% in Asians. Seventy-three per cent of cases occurred in males. The majority of whites were aged 51-70 years, while the majority in other race groups were aged 41-60 years. The ratio of only pleural to only peritoneal mesothelioma was 11:1, although there were marked differences by race. Eighty-five per cent of males with exposure information available had prior exposure to asbestos, mostly occupational. A similar proportion of women had contact with asbestos but mostly through other types of exposure. Standardized incidence rates per million population aged 15 years and over were calculated for sex-race subgroups and were highest in white males (32.9 per million per year, 95% Cl 22.7-46.4), coloured males (24.8 per million per year, 95% Cl 16.2-36.9) and coloured females (13.9 per million per year, 95% Cl 7.7-23.5). These incidence rates are amongst the highest ever reported for a national population. Age-specific standardized incidence rates were highest in white males (over 100 per million per year in men over 55 years). Reasons for the differing rates by population group are likely to include differential access to health services. More rigorous control of asbestos exposure in the RSA is recommended.
Silicosis in non-mining industry on the Witwatersrand.
Silicosis outside the mines in South Africa has received little legislative or public attention. Between 1972 and 1986 217 such cases were seen at the National Centre for Occupational Health clinic, including 46 cases of progressive massive fibrosis. The relatively high proportion of cases of progressive massive fibrosis (21%), of patients less than or equal to 40 years at diagnosis (21% of blacks) and with exposures of less than or equal to 10 years (18%) indicate high silica exposures in industry. Four industries accounted for 83% of the cases--foundries, ceramics factories, refractories, and ore and stone crushing. Radiologically, readings of a mixture of rounded and irregular opacities were not uncommon (14%). Lymphadenopathy was very uncommon (less than 1%), while pleural thickening other than loss of the costophrenic angle was absent. Prevalences of symptoms, signs and lung function abnormality were high, probably owing to a range of factors other than silicosis. Cases of progressive massive fibrosis had significantly higher prevalences of these clinical abnormalities. When two separate lung function prediction equations were applied to the observed values in these cases, the number that met criteria for 'abnormality' differed. This finding has important implications for compensation. Recommendations include control of silica-using industries and careful occupational history-taking by clinicians.
The political abuse of medicine and the challenge of opposing it.
A fundamental aim of medicine is to protect and promote health. The practice of medicine has, however, been used to promote political aims which may be detrimental to health. The article attempts to isolate the ways in which political abuses may interfere with good medical practice: by allowing health policies to be influenced by undemocratic political considerations; by using health services to reward or punish political supporters or opponents; by direct medical involvement in political acts which contradict accepted medical ethics; and by the support which conventional medical practises give to perpetuating inequalities in health and social services. Each of these is examined with the use of a number of examples. The ways in which medical personnel have opposed the political abuse of medicine is explored by a brief review of the opposition of Chilean doctors to torture, the involvement of South African doctors in opposing the abuse of health services in perpetuating apartheid, and the growing medical movement in opposition to nuclear war. Some comments concerning the monitoring of a multitude of medical disciplines which are open to political abuse are made. The purpose of the paper is primarily to stimulate debate around this important issue and it does not attempt to provide a comprehensive review of the political abuse of medicine.
Occupational history-taking in the RSA.
Medical practitioners need to elicit a comprehensive occupational history from their patients, since this may play an integral part in establishing the diagnosis, may indicate the most appropriate form of management, and will ensure that claims for Workmen's Compensation are initiated when appropriate. This history can also assist in identifying undetected workplace hazards and in formulating and testing hypotheses concerning the relationship of work to health. The particular problems encountered in taking an occupational history effectively in the RSA are discussed.
Isocyanates and health--a review.
Isocyanates are chemical compounds used increasingly frequently in industry for the production of a wide range of goods. They can produce severe asthmatic responses in the sensitive. Health hazards, diagnosis, first-aid measures, prevention and legislation are discussed. Patients presenting with apparently work-related asthma should be questioned about exposure to these substances, and workers should be informed of the dangers of such exposure. Legislation should be passed setting limits for exposure to isocyanates and ensuring compensation for those workers whose health is affected by exposure to these compounds.
Health policy in less developed countries: past trends and future directions.
Explore the source record for details and available documents.
Injuries in developing countries: policy response needed now.
Explore the source record for details and available documents.
Militarism, militarization, health and the Third World.
This paper examines the relationship between militarism, militarization, health and development. It draws attention to the fact that world military expenditure has continued to soar since the Second World War. Wars increasingly exact a heavy civilian toll. Third World countries are consuming, producing, and exporting more armaments than ever before. The rate of growth of military expenditure in developing countries has been far greater than their rate of growth in gross national product or in foreign economic aid. Countries under military control tend to be more repressive and to have suffered more years at war than those under civilian rule. Widespread availability of arms makes the settlement of disputes through violence more likely. Internal wars and violence are stimulated by a range of factors including inequalities in political and economic power, uneven development, and lack of popular participation in policy decisions by the majority of the population. The support of the industrialized countries for armament sales should be monitored, challenged and made politically unpalatable. Local development and regional cooperation should be stimulated. Health workers, as witnesses to the destruction to public health caused by war and violence, should play a part in advocating a reduction in the arms trade and the promotion of development in Third World countries.