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PubMedDate not supplied

Design of custom hip stem prostheses using three-dimensional CT modeling.

Long life expectancy, demand for high activity levels, and bone loss at the time of revision motivate the search for reliable and successful noncemented hip stem designs. It is hypothesized that improved implant fit may increase the longevity of noncemented total joints. Quantitative X-ray CT has enabled the use of a computerized stem design program, which designs an optimal-fit hip stem for individual femurs. Computed tomography and interactive image processing methods are used to generate the individual three-dimensional femoral models, which are used by the stem design program. Optimal-fit design provides maximum stem-bone contact while satisfying the requirement of being surgically insertable. Previous methods of custom implant design, including those that use three-dimensional CT modeling, have not provided optimal stem-bone fit. Quantitative results of this new process are presented.

Aged↗
PubMed1978

The design of a training program for adolescent medicine. Thoughts of fellows in training.

Program design for training in Adolescent Medicine is still in an evolutionary state. Postgraduate fellows and program directors have different perceptions with regard to the importance of various components of the ideal training program. Fellows indicate a higher priority for problems associated with the female reproductive system than do their mentors. Inpatient experience received lesser emphasis by the Fellows. Adolescent Medicine as a subspecialty discipline is discouraged.

Adolescent↗
PubMed1991

OVID and SUPER: two overlap programs for drug design.

Two programs, OVID and SUPER, for exploring the similarity of molecules with respect to their action at a receptor are described. OVID accepts two molecules as input and optimizes the three-dimensional overlap of specified atoms in one molecule with specified atoms in the second molecule. The result is expressed as a percent of the theoretical maximum. OVID gives a quantitative measure of the extent of a guessed correspondence between two molecules based on volume overlap of selected atoms. The Achilles' heel of OVID is that the correspondence between the two molecules has to be guessed. We realized that it would be better to systematically examine all possible correspondences of two structures to minimize the chance of overlooking a superior correspondence. We created SUPER to satisfy this need. SUPER accepts two molecules as input and finds the top twenty correspondences of their surfaces and charge distributions, giving a quantitative measure of the extent of each correspondence. An instructive example of the application of OVID and SUPER to the design of leukotriene D4 receptor antagonists is described. SUPER appears to be a practical brain-storming tool for the medicinal chemist trying to understand how molecules whose structures may not resemble one another in an obvious way can bind to the same site.

Acetophenones↗
PubMed1986

Community-wide prevention strategies: evaluation design of the Minnesota Heart Health Program.

The Minnesota Heart Health Program (MHHP) is a community-based research and demonstration program designed to accelerate population-wide changes in coronary risk factors and disease. MHHP is on-going in three pairs of communities in Minnesota, North and South Dakota. To strengthen inference of program effects, its basic design involves elements of control, repetition, sensitive trend measurements and evaluation of the effects of program components. Its evaluation design is presented here as a comprehensive measurement system for disease endpoints, risk factor levels and efficacy of specific educational programs. The MHHP design is able to compare risk factor levels and mortality rates between education and comparison communities. MHHP statistical power is sufficient to detect community-wide changes of public health import. Early results show comparability of education and comparison communities for most variables. Widespread community awareness of and participation in MHHP programs is reported.

Adult↗
PubMed1991

Object-oriented design and programming in medical decision support.

The concept of object-oriented design and programming has recently received a great deal of attention from the software engineering community. This paper highlights the realisable benefits of using the object-oriented approach in the design and development of clinical decision support systems. These systems seek to build a computational model of some problem domain and therefore tend to be exploratory in nature. Conventional procedural design techniques do not support either the process of model building or rapid prototyping. The central concepts of the object-oriented paradigm are introduced, namely encapsulation, inheritance and polymorphism, and their use illustrated in a case study, taken from the domain of breast histopathology. In particular, the dual roles of inheritance in object-oriented programming are examined, i.e., inheritance as a conceptual modelling tool and inheritance as a code reuse mechanism. It is argued that the use of the former is not entirely intuitive and may be difficult to incorporate into the design process. However, inheritance as a means of optimising code reuse offers substantial technical benefits.

Adult↗
PubMed1979

The Mayo Three-Community Hypertension Control Program. I. Design and initial screening results.

The Mayo Three-Community Hypertension Control Program implemented graduated programs for the control of high blood pressure in three rural southeastern Minnesota communities, beginning in 1974. Prevalence of hypertension (when defined as diastolic blood pressure, at initial screening, of 95 mm Hg or more) was similar to that found for comparable groups by age and sex in the United States generally, but an atypically high frequency of known but untreated hypertension was found. Programs of public and professional information, systematic household screening, continuing professional education (two communities), and a new community hypertension clinic (one community) were initiated, and plans were made to evaluate the programs simultaneously by means of total rescreening of persons found to be hypertensive initially. The present report describes in detail the design of the program and the results of initial screening in relation to findings in other populations at the time. Subsequent reports assess the impact of each program on its target community and of a community hypertension clinic within the one setting where this component of a model program was established.

Adult↗
PubMed1989

Directed blood procurement does not benefit patients who are enrolled in an autologous blood predeposit program.

Designated or directed blood transfusion (DD) is a controversial practice; its merits are currently debated on the basis of implications for the national blood supply and on the "safety" of directed blood compared with homologous blood. An equally compelling issue for the merits of DD is whether this practice results in its putative effect: to avoid volunteer homologous blood exposure. To study this, the authors reviewed 112 consecutive patients (73 orthopedic) who predeposited autologous blood for elective surgery. This group was compared with 17 patients (all orthopedic) who predeposited autologous blood and also requested storage of designated blood. Seven of 17 patients with DD subsequently received homologous blood, compared with 11 of 112 patients without designated blood (NDD, P less than 0.01) and 3 of 35 NDD orthopedic patients asked to predonate three or more units of blood, P = 0.015. DD and NDD patients were no different when analyzed for age, sex, or units blood stored; admission, nadir, or discharge hematocrit; autologous blood transfused; days in hospital; or surgical blood loss. The authors conclude that patient requests for DD are unjustified for elective surgical patients who are eligible to donate autologous blood because DD as practiced in this setting does not avoid subsequent homologous blood exposure. Maximizing autologous blood procurement is the preferred alternative for avoiding homologous blood transfusion.

Adolescent↗