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Biomedical subjects

J McMahan

Publications and source records attributed to J McMahan.

8 recordsLinked to original sources

Cloning, killing, and identity.

One potentially valuable use of cloning is to provide a source of tissues or organs for transplantation. The most important objection to this use of cloning is that a human clone would be the sort of entity that it would be seriously wrong to kill. I argue that entities of the sort that you and I essentially are do not begin to exist until around the seventh month of fetal gestation. Therefore to kill a clone prior to that would not be to kill someone like you or me but would be only to prevent one of us from existing. And even after one of us begins to exist, the objections to killing it remain comparatively weak until its psychological capacities reach a certain level of maturation. These claims support the permissibility of killing a clone during the early stages of its development in order to use its organs for transplantation.

Beginning of Human Life↗

The effect of husband counseling on NORPLANT contraceptive acceptability in Bangladesh.

A pilot study of the effect of husband counseling on NORPLANT contraceptive acceptability was conducted at four family planning clinics in Bangladesh. The study objectives were to compare discontinuation rates and user satisfaction among acceptors whose husbands received counseling about the method versus those who did not. Of a total 617 subjects enrolled in the study which began in 1988, about two-thirds (408) of the husbands were counseled at admission or at the one-month follow-up visit while the remainder of the husbands (209) were not counseled. Follow-up visits were scheduled at one and six months after NORPLANT implants insertion, and every six months thereafter until the close of the study in 1991. Some evidence was found that counseling husbands of NORPLANT implants acceptors may reduce discontinuation rates. At the end of 36 months, a difference of 10 percentage points in total discontinuation rates was observed between the husband-counseled group (32 per 100 women) and the husband-not-counseled group (42 per 100 women). The husband counseling had the most impact at clinics with higher discontinuation rates. Based on Cox's proportional hazards regression model results, the hazard for discontinuation among the acceptors in the husband-not-counseled group. Satisfaction with NORPLANT implants did not differ between the two groups. Although these results are not striking, they do suggest a potential positive effect of husband counseling on NORPLANT contraceptive accept-ability. In future studies, the counseling of husbands should be more intensive and standardized.

Adolescent↗

Pneumoconiosis in an elderly dentist.

Numerous dusts found commonly in the dental laboratory have been suggested as potential pulmonary hazards. We recently noted a case of severe interstitial pulmonary fibrosis with intraalveolar deposition of unique foreign body inclusions in an elderly dentist. The composition of these particles was shown to be consistent with that of alginate impression powder. This is in contrast to previously reported pneumoconioses in dental workers, which are usually induced by metallic alloys or silicates. Further studies are needed to identify the causes and prevalence of pneumoconiosis in the dental lab.

Aged↗

Identification of 28 DNA fragments that detect RFLPs in 13 distinct physical regions of the short arm of chromosome 5.

A series of 175 lambda phage carrying human inserts isolated from a library that is specific for the short arm of human chromosome 5 (5p) have been regionally mapped on 5p using a deletion mapping panel of 16 human-hamster cell hybrids, each of which contains a chromosome 5 with a different deletion in the short arm. Seventy-five single copy DNA fragments were screened with 12 restriction enzymes for their ability to detect restriction fragment length polymorphisms (RFLPs). Twenty-eight of these DNA fragments, which are located in 13 distinct physical regions of 5p, were found to detect RFLPs. These DNA markers make it possible to construct a linkage map that will span the entire length of 5p and will allow the relationship between genetic and physical distance for this region of the genome to be examined at a high level of resolution.

Chromosome Mapping↗

Integrating your radiology information system in a complex computing environment.

Radiology departments are a major source of important information regarding patient care. Such information is valuable in its own right but also provides significant added value when correlated with other information, including other clinical diagnoses, therapies, utilization, costs of care and outcomes. In the past, hospitals/imaging centers have typically sought the "best" RIS to meet the needs of the department and its user constituencies (physicians, nurses, medical records, etc.). Function and feature drove the RIS selection process. "Best of breed" was the rallying cry. Having multiple systems and vendors requires information systems and departmental staff to maintain expertise and support in each system and to interact with each vendor. The best-of-breed approach has a number of hidden costs. Before buying, ask "Is the best-of-breed RIS so much better than a more integrated solution that the support and integration efforts are worth it?" This is a complex question involving true needs, perceived needs, wants (justifiable or not), ego, politics, institutional future plans and more. Effective integration in a complex computing environment involves both technical processes and people processes. A cooperative, team-oriented process with the appropriate allocation of staff functions based on expertise and experience is needed. In general, the radiology department is best able to manage operations of the RIS. The information systems department should retain responsibility for housing the RIS computer and performing routine backup procedures as well as monitoring RIS performance. Both organizations can contribute to a highly successful integrated system operation based on their respective knowledge and experience. The IHE (Integrating the Healthcare Enterprise) is a joint initiative of the RSNA and HIMSS (Healthcare Information Systems Society) to stimulate the integration of information and imaging systems. The initiative will promote enterprise-wide sharing of data via established standards. The organizations, at their annual national meetings, will provide a visible forum and showcase of integration capabilities (most recently at HIMSS 2000).

Computer Systems↗

Making it work: planning and executing a successful LIS installation.

This article relates how to plan and execute a successful laboratory information system (LIS) installation for those installing a first LIS, converting to a new LIS, or upgrading the current LIS. It covers the planning process, schedule adherence, vendor relationships, project team management, and system readiness, as well as post-installation issues.

Clinical Laboratory Information Systems↗