Biomedical subjects

B D Wagner

Publications and source records attributed to B D Wagner.

5 recordsLinked to original sources

PubMed1991

Intervascular occlusion of canine renal, splenic, and vertebral arteries using electromagnetic field focusing (EFF) probe.

Electromagnetic field-focusing (EFF) probe is a precision surgical and interventional tool. Use of the device produces maximum temperature in excess of 1800 degrees C by convergence of radio-frequency (RF) induced eddy currents in biological tissues. Applications of the EFF probe in angioplasty, aneurysm thrombosis, and neurosurgery have been previously reported. In the present work, the EFF probe was guided under fluoroscopic control and used to occlude renal, splenic, and vertebral arteries in dogs. The occlusion was typically accomplished with about one minute of RF power application. Histology of the treated vessel three to six weeks posttreatment showed total occlusion consisting of intimal and subintimal changes and organized thrombus in the lumen. This suggests that the EFF probe in comparison with other procedures is an inexpensive, relatively safe precision interventional tool for performing an occlusion for experimental and therapeutic purposes.

Animals↗

PubMed1991

Effects of cocaine on canines' coronary arteries.

Nine canines were anesthetized with pentobarbital and studied by both selective and semiselective coronary artery angiography following intravenous bolus doses of 1,3,5,8, or 10 mg/kg of cocaine. Catheterization was accomplished with a 5 Fr catheter over a 0.035 inch guidewire under fluoroscopic control, and angiograms were obtained by injection of a diatrizoate solution. Digital subtraction angiography (DSA) was performed prior to cocaine administration and at minutes 0.5, 1, 1.5, 3, 5, and, in some cases, minutes 10 and 15 after cocaine administration. The 1 and 3 mg/kg doses of cocaine had no effect on the coronary arteries. The 5 mg/kg dose significantly dilated the coronary arteries. The 8 mg/kg dose produced significant dilation at 30 seconds after cocaine but nonsignificant dilation of the coronary arteries at all other times. The 10 mg/kg dose produced significant dilation at 30 seconds, nonsignificant dilation at 60 seconds followed by significant constriction at 90 seconds after cocaine, which led to immediate death in most animals. The coronary dilation and constriction produced by 10 mg/kg of cocaine could be prevented by either preadministration or postadministration of naloxone, but this did not prevent subsequent death.

Angiography, Digital Subtraction↗

PubMed1991

Specialized partial hospitalization for older adults: a clinical description of an intermediate-term program.

The field of geriatric mental health is confronted with the dilemma of a sharp rise in the elderly segment of the population and a concomitant shortage of age-appropriate psychiatric intervention services. There is tremendous need for specialized hospital-based intervention for older adults with mental health problems. A creative and rapid response is imperative and should be based on a continuum of geropsychiatric services that includes acute inpatient, partial hospitalization, and outpatient services. Because Medicare reimbursement for partial hospitalization is restricted to hospital-based programs, private psychiatric hospitals are uniquely positioned to assume a dominant role in the geriatric mental health service delivery system. This article details one hospital's specialized, intermediate-term partial-hospital program for older adults. Partial hospitalization is demonstrated to be an essential component of comprehensive geropsychiatric services that can overcome problems of cost-effectiveness, accessibility, and acceptability to consumers--all factors that presently restrict the development and use of such programs. Based on empirical findings, clinical adaptations to assessment and treatment procedures specific to older adults are presented.

Aged↗

PubMed1987

Distributions of fluorescence decay times for parinaric acids in phospholipid membranes.

Analysis of fluorescence decay data for probes incorporated into model or biological membranes invariably requires fitting to more than one decay time even though the same probe exhibits nearly single-exponential decay in solution. The parinaric acids (cis and trans) are examples of this. Data are presented for both parinaric acid isomers in dimyristoylphosphatidylcholine membranes collected to higher precision than normally encountered, and the fluorescence decays are shown to be best described by a smooth distribution of decay times rather than by a few discrete lifetimes. The temperature dependence of the fluorescence decay reveals a clear shift in the distribution to longer lifetimes associated with the membrane phase transition at 23.5 degrees C. The physical significance is that fluorescence lifetime measurements appear to reflect a physical process with a distribution of lifetimes rather than several distinct physical processes.

Dimyristoylphosphatidylcholine↗

PubMedDate not supplied

Quality indicators for partial hospitalization.

Partial hospitalization and other services along the continuum of ambulatory mental healthcare are rapidly gaining acceptance as attractive alternatives to inpatient treatment. To assure continued development of high caliber programs, leaders of the partial hospital field have been working to develop quality indicators and outcomes measures specifically tailored to the unique aspects of ambulatory care. The quality domains and indicators outlined below are based upon the principles of effectiveness, efficiency, satisfaction and viability that provide foundations for this treatment modality.

Day Care, Medical↗