Bipolar systems--do they perform?

Recent reports of bipolar sterilization failures have questioned the compatibility of bipolar forceps used with different electrogenerators. Four different bipolar forceps were matched and mismatched with five generators and the electrocoagulation effect was studied by two physicians trained in the histologic evaluation of electrical injury. All bipolar systems, matched or mismatched, failed to coagulate the fallopian tube as completely as unipolar control--except for the matched Kleppinger system. Conversely, when mismatched with other generators the coagulation effect of the Kleppinger forceps fell far below that of other bipolar forceps--matched or mismatched. Each bipolar system should be compatible and its electrocoagulation effect studied before it is used for female sterilization.

Reducing bipolar sterilization failures.

Many bipolar sterilization failures have occurred because of incomplete desiccation of the endosalpinx. This study compared the effect upon human fallopian tubes of different waveforms of electrical energy at advancing power settings. When the Valleylab SSE2-L generator was attached to the Kleppinger bipolar forceps, complete desiccation was confirmed with the power set at 25 W in a cutting waveform. Other waveforms (coagulation and blend) failed to complete the task at the same power setting. An inline current meter assures the operator that all the available energy is delivered. This information should help to reduce bipolar sterilization failures.

Bowel injuries during laparoscopy. Gross anatomy and histology.

Bowel injuries during laparoscopy can result from either electrical damage or direct trauma. When electrocoagulation is used with laparoscopy, it is frequently assumed that any bowel injury is from that source. That assumption might not be accurate. In animal studies we evaluated the histologic characteristics of both electrical and traumatic bowel injuries. A consistent difference in injury pattern, both gross and microscopic, was noted. With a high degree of accuracy, those histologic and gross characteristics can be used to distinguish traumatic from electrical injuries following operative laparoscopy.

The future of environment and health: a global perspective.

The future of occupational and environmental health will depend largely on involving all groups in society, thinking globally and acting locally, and developing the popular and political will to support it. It is necessary for professionals in the field to better understand important economic, technologic, sociocultural, and other trends, and to focus their energies on listening to those being served and assessing their needs, as well as educating, advocating, and building partnerships to address these needs. Values, visions, and leadership can have an extraordinary impact on the future of the environment and health.

Azoospermia and oligospermia among a large cohort of DBCP applicators in 12 countries.

Azoospermia and oligospermia have been well demonstrated among workers exposed to 1,2-dibromo-3-chloropropane (DBCP) in manufacturing and formulation of this pesticide. After DBCP was banned in the United States in the late 1970s, two American companies continued to export it to many less developed countries. In the early to mid-1990s, attorneys assembled a cohort of approximately 26,400 male plaintiffs who, as workers on banana and pineapple plantations in 12 of these countries, had been exposed to DBCP, primarily during its application. These attorneys, for the purpose of a lawsuit against the two American companies, developed from interrogatories a database on these men that included information about stated periods of occupational DBCP exposure. Seminal fluid analysis results were also entered into the database. Analyzing information in this database, the authors found that, after a median exposure to DBCP of three years, 64.3% of these men overall, and 90.1% of men studied from the Philippines, had azoospermia or oligospermia. The mean number of children reported by the men was 2.5 overall. The percentage of men with no children was 28.5% overall. This report represents the largest cohort of DBCP-exposed workers in which adverse reproductive health effects have been described, and the first report of the adverse effects on the reproductive health of workers exposed to DBCP primarily through its application in a cohort of this size. This serious and extensive occurrence of adverse reproductive health effects due to the export of a hazardous pesticide before and after its ban in the United States illustrates a number of needs for monitoring, research, education, and policy development.

Ongoing research in occupational health and environmental epidemiology in developing countries.

Research in occupational health and environmental epidemiology can play an important role in furthering our understanding of occupational and environmental health problems. Research guides us in the recognition, management, and prevention of health problems. However, in developing countries, where rates of occupational and environmental illnesses and injuries are higher and where these problems are often more severe than in developed countries, research capabilities are less developed. In mid-1990, a project was undertaken to (a) document ongoing research in occupational health and environmental epidemiology in developing countries, (b) facilitate the exchange of information among researchers in this field, (c) stimulate research, and (d) avoid unnecessary duplication among researchers in this field. A questionnaire was mailed, the purpose of which was to learn the current status of research in developing countries and to develop a directory of such ongoing research. The questionnaire was sent to 1,528 individuals. Of the 500 research projects identified, 77% were investigating chemical hazards; 26%, physical hazards; 10%, biological hazards; and 10%, psychosocial hazards (some projects addressed multiple hazards). The chemical hazards studied most frequently were dusts, pesticides, and lead. The greatest number of research projects were identified in China, India, Brazil, Korea, and Thailand. Most projects were descriptive or cross-sectional epidemiologic studies or industrial hygiene or exposure-assessment studies. The World Health Organization has published a directory of the specific research projects that were identified in this survey.

A diagnostic strategy for myocardial infarction.

In attempting to make the diagnosis of myocardial infarction, the family physician has available an increasing array of enzyme and nuclear imaging techniques to add to the clinical and electrocardiographic findings. In this review several of the new diagnostic tests are described, and their role is discussed both in supplementing and replacing older diagnostic tests. A general strategy for employing both old and new tests is proposed, with a goal of achieving both increased diagnostic accuracy and reduced charges for laboratory tests.

Global occupational health issues: Working in partnership to prevent illness and injury.

1. Occupational health problems in developing countries are more widespread and serious because they occur against a background of endemic risk factors for ill health. 2. In general, developing countries have less adequately developed occupational health personnel and programs and less adequately developed and enforced laws and regulations than developed countries. 3. Awareness of the importance of occupational health among workers, management, government officials, and the public is increasing with developing countries. 4. Occupational health professionals in developed countries can contribute in many ways to improving occupational health in developing countries.