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  • 1
    Book
    Book
    New York u.a. :Wiley,
    Title: Biomedical imaging, visualization, and analysis
    Author: Robb, Richard A.
    Publisher: New York u.a. :Wiley,
    Year of publication: 2000
    Pages: 339 S.
    Type of Medium: Book
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  • 2
    Title: Medicine meets virtual reality 2000 : envisioning healing : interactive technology and the patient-practitioner dialogue; vol. 70
    Contributer: Westwood, James D. , Hoffman, Helene M. , Mogel, Greg T. , Robb, Richard A. , Stredney, Don
    Publisher: Amsterdam u.a. :IOS Press,
    Year of publication: 2000
    Pages: 402 S.
    Series Statement: Studies in health technology and informatics vol. 70
    Type of Medium: Book
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  • 3
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In recent Petawatt laser experiments at Lawrence Livermore National Laboratory, several hundred joules of 1 μm laser light in 0.5–5.0-ps pulses with intensities up to 3×1020 W cm−2 were incident on solid targets and produced a strongly relativistic interaction. The energy content, spectra, and angular patterns of the photon, electron, and ion radiations have all been diagnosed in a number of ways, including several novel (to laser physics) nuclear activation techniques. About 40%–50% of the laser energy is converted to broadly beamed hot electrons. Their beam centroid direction varies from shot to shot, but the resulting bremsstrahlung beam has a consistent width. Extraordinarily luminous ion beams (primarily protons) almost precisely normal to the rear of various targets are seen—up to 3×1013 protons with kTion∼several MeV representing ∼6% of the laser energy. Ion energies up to at least 55 MeV are observed. The ions appear to originate from the rear target surfaces. The edge of the ion beam is very sharp, and collimation increases with ion energy. At the highest energies, a narrow feature appears in the ion spectra, and the apparent size of the emitting spot is smaller than the full back surface area. Any ion emission from the front of the targets is much less than from the rear and is not sharply beamed. The hot electrons generate a Debye sheath with electrostatic fields of order MV per micron, which apparently accelerate the ions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5765-5767 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magneto-optical Kerr effect measurements performed on (0.3 nm Co/x Pt)15 multilayers with x=0.3–2.0 nm showed all samples to exhibit strong perpendicular magnetic anisotropy. Recent work has shown that for compositions near (0.3 nm Co/1.2 nm Pt)15, both polar Kerr rotation and ellipticity exhibit bimodal reversals in which the major hysteresis loops have two distinct field-dependent steps due to the contributions of two magnetic phases. To better understand this bimodal magnetization phenomenon, Kerr rotation and ellipticity were determined as a function of radial position from the center to the edge of this disk sample. These measurements exhibit a continuous variation from two-step (bimodal) behavior in the center to single-step (unimodal) behavior at the edge. Since these films were deposited via MBE with a heated substrate, it is believed that this phenomenon is related to thermally induced variations in interface effects such as alloying, abruptness, and morphology. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Inc
    Public health nursing 17 (2000), S. 0 
    ISSN: 1525-1446
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study sought to determine HIV prevention strategies other than male condom use employed by low-income women who have sex with men (WSM) and to identify variables that predict use of these strategies. A cross-sectional survey of nearly 4,000 women receiving Women, Infants, and Children (WIC) benefits in 21 Missouri counties was conducted. The response rate was 58%, with 2,256 completed questionnaires returned. Women were asked to indicate one or more of nine methods they had ever used to prevent HIV infection. Women were also asked about their use of male condoms, preference for male condoms versus female condoms, and which partner usually made decisions about STD/HIV prevention. Of the 2,256 questionnaires returned, 1,325 WSM indicated use of at least one HIV prevention strategy other than condom use. Strategies were: being tested for HIV (68.2%), partner being tested for HIV (44.1%), asking partner about his sex history (41.1%), using oral contraceptives (18.8%), asking him if he has HIV (13.7%), douching (11.8%), withdrawal (9.4%), and having anal or oral sex (6.6%). Common predictors of these strategies were race, education, history of STD, condom use, and marital status. Basic misunderstandings about HIV prevention are common in specified subpopulations of low-income women. HIV prevention programs for low-income WSM should capitalize on women's efforts to prevent HIV by designing programs to help women replace ineffective prevention strategies with effective prevention strategies.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 11 (2000), S. 0 
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Background: Fast-track recovery after coronary artery bypass surgery has influenced patient care positively. Predicting patients who fall off track and require prolonged (≥7 days) hospitalization remains uncertain. The Parsonnet risk assessment score is effective in predicting length of stay, but is limited by inaccurate subdivision of risk categories. We simplified the Parsonnet risk scale to better identify patients eligible for fast-track recovery. Method: The cases of 604 consecutive patients who underwent isolated coronary artery bypass grafting (CABG) using cardiopulmonary bypass (CPS) were reviewed retrospectively. A rapid recovery protocol emphasizing reduced CPB time, preoperative intra-aortic balloon pump (IABP) criteria, and atrial fibrillation prophylaxis was applied to all patients. The five original divisions of the Parsonnet risk scale were reduced to three risk categories: Low (0–10; Group A), Intermediate (11–20; Group B), High (〉 20; Group C). Comparisons of progressive risk categories were analyzed to identify predictive factors associated with fast-track outcomes. Results: The thirty-day operative mortality for the entire group was 3.6%. Three clinical features were identified that distinguished risk progression—female gender, reoperative CABG, and increased age. Additionally, the presence of diabetes (p 〈 0.05), congestive heart failure (p 〈 0.01), and peripheral vascular disease (p 〈 0.001) distinguished Groups A and B, while acute myocardial infarction (p 〈 0.05) influenced outcomes in Group C. Group A (48%) mean risk score 5.9 ± 3.2 was compared to Group B (34%) 14.8 ± 2.6, which was further compared to Group C (18%) 26.4 ± 2.8. The mean length of stay for Group A (5.3 ± 4.1 days) was notably less than Group B (6.1 ± 4.7 days; p 〈 0.05); however, both groups responded favorably to fast-track techniques. Group C did not respond comparably (9.2 ± 9.2 vs 6.1 ± 4.7 days; p 〈 0.001) and experienced prolonged recovery. The simplified Parsonnet risk scale did not identify differences in operative mortality and revealed only pneumonia (p 〈 0.05) and atrial fibrillation (p 〈 0.01) to be greater in Group C. As risk increased, significantly less revascularization was performed (Group A 3.6 ± 1.2 grafts/patient vs Group B 3.3 ± 1.2 [p 〈 0.01]; Group B 3.3 ± 1.2 vs Group C 2.5 ± 1.0 [p 〈 0.001]). Conclusion: A simplified Parsonnet risk scale (three categories) is an effective tool in identifying factors limiting fast-track recovery. Low- and intermediate-risk patients represent the majority (82%) and respond well to fast-track methods. High-risk patients (18%) are limited by a greater percentage of female patients, reoperative CABG, and the very elderly, resulting in fast-track failure. Strategies to improve recovery in high-risk patients may include evolving off-pump techniques.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 13 (2000), S. 0 
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Several studies show worse outcome for diabetic patients after percutaneous transluminal coronary angioplasty (PTCA). There are relatively few studies evaluating outcome in the modern era of coronary stenting. We compared the incidence of death, myocardial infarction (MI), and repeat target lesion revascularization (RTLR) by PTCA or coronary artery bypass grafting (CABG) over a 6-month follow-up in 110 diabetic and 400 nondiabetic patients receiving Palmaz-Schatz stents. All patients received aspirin/ticlopidine and stents were deployed using high-pressure inflations. Seventy-five (68.2%) diabetic patients and 272 (68%) nondiabetic patients had single stents, while 35 (31.8%) diabetic and 128 (32%) nondiabetic patients had multiple stents (≥ 2stents in the same vessel). The success rate and acute major complications were not significantly different between diabetic and nondiabetic patients. There was also no significant difference in death, MI, and repeat PTCA between these two groups. Diabetic patients underwent CABG more frequently than nondiabetic patients (12.7% vs 3.2%, respectively, P =0.001) and diabetic patients also had RTLR more frequently than nondiabetic patients (25.5% vs 12.8%, respectively, P = 0.002) during 6-month follow-up. Multivariate analysis showed that diabetes and multiple stents independently contributed to the 6-month RTLR rate. Coronary stenting in diabetic patients can be carried out with a high success rate and low incidence of acute major complications. The presence of diabetes mellitus and multiple stent placement significantly increase the incidence of repeat target lesion revascularization.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 11 (2000), S. 0 
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Deexcitation During Fibrillation Induction and Defibrillation. Previous models of fibrillation induction and defibrillation stressed the contribution of depolarization during the response of the heart to a shock. This article reviews recent evidence suggesting that comprehending the role of negative polarization (hyperpolarization) also is crucial for understanding the response to a shock. Negative polarization can “deexcite” cardiac cells, creating regions of excitable tissue through which wavefronts can propagate. These wavefronts can result in new reentrant circuits, inducing fibrillation or causing defibrillation to fail. In addition, deexcitation can lead to rapid propagation through newly excitable regions, resulting in the elimination of excitable gaps soon after the shock and causing defibrillation to succeed.
    Type of Medium: Electronic Resource
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