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Biomedical subjects

J B Anderson

Publications and source records attributed to J B Anderson.

At least 109 records · Page 6Linked to original sources
PubMedDate not supplied

Retrospective analysis of guardians' perceptions of cognitively impaired elderly.

The increased number of elderly persons who will become cognitively impaired in the near future is a cause for concern to all in the health care professions. Even though the final determination of incapacity and incompetency is a legal decision, input from health care professionals is weighed heavily by courts. Health professionals can have influence at the clinical level and also at the level of influencing social policy. Nurses rely on input from the assessments of informal caregivers. This research was conducted to determine guardians' perceptions of important criteria on the Incompetency Assessment Scale. Eleven guardians, a majority of whom were daughters of the elderly wards, perceived 9 of the 22 criteria on the IAS as important or very important to the question of incompetency. All nine criteria are found in Minnesota's statutory definition of incompetency, and also appear in the first two levels of the Maslow hierarchy of needs. Further research is recommended to develop a weighting or clustering of criteria to more accurately ascertain the way that incompetency judgments are made by guardians and other caregivers.

Adolescent↗
PubMedDate not supplied

Numerical studies of blood shear and washing in a continuous flow ventricular assist device.

The third prototype of a continuous flow ventricular assist device (CF3) is being developed and tested for implantation in humans. The blood in the pump flows through a fully shrouded four bladed impeller (supported by magnetic bearings) and through small clearance regions on either side of the impeller. Computational fluid dynamics (CFD) solutions for this flow have been obtained by using TascFlow, a software package available from AEA Technology, UK. These flow solutions have been used to estimate the shear stresses on the blood in the pump and, hence, to minimize hemolysis. In addition, the solutions are informative for achieving a design that will provide good washing of the blood to minimize the possibility of stagnation points that can lead to thrombosis. This study presents numerical studies of these phenomena in the CF3. The calculated shear rate results are compared with values published in the open literature. The comparisons indicate that hemolysis will not be a problem with CF3, which is in agreement with preliminary experimental measurements. Flow studies are being conducted to determine the optimal size of the clearance regions.

Blood Flow Velocity↗