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Biomedical subjects

D Mehr

Publications and source records attributed to D Mehr.

6 recordsLinked to original sources
PubMed2000

Tenascin-C in tendon regions subjected to compression.

Tendon regions subjected almost exclusively to tension differ from regions subjected to high levels of compression as well as tension. Regions not exposed to compression consist primarily of spindle-shaped fibroblasts surrounded by densely packed longitudinally oriented collagen fibrils formed principally from type-I collagen. In contrast, regions subjected to compression have a fibrocartilagenous structure and composition: they consist of spherical cells surrounded by a matrix containing hyaline cartilage proteoglycans (aggrecan) and type-II collagen as well as type-I collagen. Reducing their adhesion to the matrix may help cells in the latter regions establish and maintain a spherical shape and minimize their deformation when the tissue is subjected to mechanical stress. We hypothesized that expression of tenascin-C, an anti-adhesive protein, is part of the adaptation of tendon cells to compression that helps establish and maintain fibrocartilagenous regions. To test this hypothesis, we compared segments of bovine flexor tendons subjected to repetitive compression (distal) with segments that are not subjected to compression (proximal) to determine whether they differed in tenascin-C content and expression. RNA and protein analyses showed that tenascin-C expression was elevated in the distal tendon. Tendon cells from the distal segment expressed more tenascin-C mRNA than did cells from the proximal segments for as long as 4 days in cell culture, indicating that increased tenascin-C expression is a relatively stable feature of the distal cells. Moreover, purified tenascin-C inhibited the attachment of cultured tendon cells to fibronectin. These observations support the hypothesis that tenascin-C expression is a cellular adaptation to compression that helps establish and maintain fibrocartilagenous regions of tendons by decreasing cell-matrix adhesion.

Animals↗
PubMed2000

Light care residents in nursing homes: why they come, why they stay.

With the increasing numbers of frail elderly, why light-care nursing home (NH) residents enter and remain in NHs is important to understand. Light-care residents (n = 98) from 11 NHs and their nurses were interviewed using open-ended questionnaires. Residents' care requirements were estimated using Resource Use Groups, Version III (RUG-III). We found that residents entered and remain in NHs because of the inability to perform instrumental activities of daily living, the fear of injury, ambulation problems, health problems, the lack of daily assistance, and a recent hospitalization. Most residents and nurses did not know of other options. These problems could be managed in the community if appropriate systems were in place.

Activities of Daily Living↗
PubMed1993

The health status and health care utilization of deaf and hard-of-hearing persons.

OBJECTIVE: To evaluate whether health habits, self-reported health status, and communication with physicians play a role in the known altered health care utilization patterns of deaf and hard-of-hearing persons. DESIGN: A cross-sectional survey. Respondents were given the choice of completing either a self-administered written survey or an American Sign Language interview-administered survey. POPULATION: Eighty-seven deaf and hard-of-hearing members of various organizations serving this population in southeastern Michigan and 88 hearing patients from a family practice clinic in the same area. RESULTS: Deaf and hard-of-hearing persons visit physicians more frequently (P = .01), have a lower incidence of ever smoking tobacco (P < .0006) and of alcohol use (P = .04), have more difficulties communicating with physicians (P < .001), have trouble understanding physicians (P < .001), and feel less comfortable with physicians (P < .001). Lower current tobacco use among deaf and hard-of-hearing persons was only seen in persons who were not educated beyond high school. Increased frequency of physician visits for deaf and hard-of-hearing persons was especially noticeable in the group of persons 60 years of age and older. Our finding that use of interpreters is associated with increased utilization and decreased understanding suggests deaf and hard-of-hearing patients presenting with interpreters warrant more focused attention from physicians. Reasons for seeing physicians did not explain the difference in frequency of physician visits between the two groups. CONCLUSIONS: Deaf and hard-of-hearing persons report a lower subjective health status and higher physician utilization, as well as substantial communication difficulties with physicians. They also report better health-related behaviors, namely less use of tobacco and alcohol. The use of interpreters did not decrease physician utilization or improve the understanding of physicians by these persons. Overall, our results underscore the fact that deaf and hard-of-hearing persons constitute a minority population that experiences considerable difficulties in the patient-physician relationship.

Adult↗