Information about the central venous pressure is important in evaluating several clinical conditions including cardiac failure and volume overload. The jugular veins serve as a primary route for the indirect estimation of the central venous pressure or waveform. The conventional methods for acquiring the central venous pressure in these veins have been through neck visualization and the insertion of catheters. Even though these procedures are effective if done properly, they have various downsides such as being invasive, inaccurate and time consuming. In this research, a sensor is proposed for the noninvasive detection of central venous waveforms within the jugular veins. The sensor is a reflectance configured probe which utilizes laser based on the photoplethysmography principle. The effectiveness of the sensor was tested in-vitro using a mock circulatory loop and was also tested on a single human subject. The results from the tests indicated a very good sensor response in estimating pressure waveforms.

This document only includes an excerpt of the corresponding thesis or dissertation. To request a digital scan of the full text, please contact the Ruth Lilly Medical Library's Interlibrary Loan Department (rlmlill@iu.edu).

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Thesis--Umeå University, Sweden. / Also published as Umeå University Medical dissertations, ISSN 0346-6612 ; new ser. no. 75.

Thesis (Ph.D.)--Michigan State University. Dept. of Pharmacology and Toxicology, 2008. / Title from PDF t.p. (viewed on July 22, 2009) Includes bibliographical references (p. 175-214). Also issued in print.

Thesis (M.S.)--Brigham Young University. Dept. of Exercise Sciences, 2007. / Includes bibliographical references.

The supine posture has been shown to limit exercise-induced plasma volume expansion. Differences in hydrostatic pressure gradients between the standing and seated position indicate that treadmill exercise might promote a greater plasma volume expansion than cycle ergometer exercise. To test this hypothesis ten subjects performed intermittent high intensity exercise (4 min at 85% VO2max, 5 min at 40% VO2max repeated 8 times) on separate days on the treadmill and cycle ergometer. Changes in plasma volume expansion were calculated from changes in hematocrit and hemoglobin. Stroke volume (SV), trans-thoracic impedance (Z0), HR, and arterial blood pressure (non-invasive arm cuff, SBP & DBP) were assessed in the seated position before and postexercise. Zo increased (p<0.05) as subjects started exercise (both treadmill and cycling), indicating a reduction in central blood volume (CBV), which returned to baseline towards the end of exercise. Postexercise Zo returned to control levels within 30 min regardless of the previous exercise mode. A significant post-exercise hypotension was observed following cycle ergometer exercise (p<0.05) but not following treadmill exercise. Plasma volume increased 6.1±1.0% and 7.0 ± 1.1% (p<0.05) following treadmill and cycle ergometer exercise, respectively. The increase in PV was similar for both exercise modes. Initial differences in central blood volume disappeared over the course of the exercise protocol and during recovery, possibly indicating that there is a postural threshold and moving beyond it yields no further effect. The lack of differences between modes of exercise on plasma albumin content and Z0 indicate that the upright postures were not different from each other. As such, PV expansion following high intensity intermittent exercise appears to be independent of upright exercise mode.

INTRODUÇÃO: A construção do conhecimento apoiada em novas tecnologias tem evoluído rapidamente e estas desempenham papel importante como elemento transformador do modo de acessar e organizar as informações, constituindo um aliado do estudante na aquisição e organização do conhecimento. OBJETIVO: Avaliar a aprendizagem e a satisfação de estudantes em relação ao uso do aplicativo multimídia em plataforma móvel para o ensino da mensuração da Pressão Venosa Central (PVC). MÉTODO: Trata-se de uma pesquisa de desenvolvimento tecnológico, acompanhada de um estudo longitudinal, quase experimental, realizado em duas etapas. A primeira etapa constituiu-se por um método quase experimental, do tipo antes e depois, para a verificação da apreensão do conhecimento após a intervenção - utilização do aplicativo para o ensino da PVC por 60 dias - e a comparação com os resultados obtidos no período pré-intervenção. Nesta etapa, além da aplicação de um questionário para avaliar o conhecimento sobre a mensuração da PVC, o exame de habilidades estruturado, baseado no modelo Objective Structured Clinical Examination (OSCE), foi utilizado para avaliação da execução do procedimento em situação prática. A segunda etapa compreendeu a aplicação de um instrumento para verificar a autoavaliação da aprendizagem pós-intervenção e a satisfação dos estudantes em relação ao uso do aplicativo. O local de estudo foi uma instituição de Ensino Superior privada, no município de Santos-SP. A amostra foi composta por 31 estudantes, que atenderam aos critérios de inclusão. As avaliações teóricas e práticas foram submetidas à análise de medidas repetidas por meio do test t de Student e a correlação da avaliação prática com os acessos ao aplicativo foi feita com o coeficiente de correlação de Pearson. Também foi feita regressão linear para identificar a existência de variáveis associadas ao aprendizado. As variáveis qualitativas foram apresentadas em valores absolutos e relativos e as quantitativas foram apresentadas em valores de tendência central e de dispersão. RESULTADOS: As médias das notas do teste pré (4,10) e pós-intervenção (5,57) revelaram diferença estatística significativa no grau de conhecimento teórico, com p = 0,004. Na avaliação das habilidades práticas por meio do OSCE, todas as estações apresentaram resultado significativo, tendo as estações 1 e 2 p = 0,002 e a estação 3 p = 0,000. O cruzamento do resultado do desempenho prático com a quantidade de acessos às telas específicas para esse fim no aplicativo não apresentou diferença estatística significativa. Não foram identificadas variáveis estatisticamente significativas associadas ao aprendizado. Em relação à autoaprendizagem e à satisfação, 95,7% dos estudantes concordaram que o aplicativo favoreceu o aprendizado da mensuração da PVC. CONCLUSÕES: Esta pesquisa demonstrou a viabilidade e a eficácia da utilização de um recurso tecnológico, especificamente desenvolvido para dispositivos móveis e baseado na aprendizagem significativa e na pedagogia construtivista, como ferramenta de apoio ao processo de ensino-aprendizagem. Esta pesquisa abre perspectivas para novos caminhos investigativos e estudos de produção tecnológica que poderão contribuir para aprimorar a formação dos estudantes e a atuação dos profissionais. Também pode servir de incentivo para a criação de novos grupos de estudo e pesquisa em Tecnologia na Enfermagem. / INTRODUCTION: Knowledge construction supported by new technologies has evolved rapidly and they play a significant role as an element changing the way to access and organize information, constituting a students ally in knowledge acquisition and organization. OBJECTIVE: Evaluate students learning and satisfaction in relation to the use of a multimedia application on a mobile platform for teaching how to measure central venous pressure (CVP). METHOD: This is a technology development research, accompanied by a longitudinal study, quasi-experimental, conducted in two stages. The first stage consisted in a quasi-experimental method, with a before and after design, to verify knowledge acquisition after the intervention use of the application for teaching CVP for 60 days and compare it to the results obtained within the pre-intervention period. At this stage, besides the application of a questionnaire to evaluate knowledge on CVP measurement, the structured skills examination, based on the Objective Structured Clinical Examination (OSCE) model, was used to evaluate how the procedure is executed in a practical situation. The second stage involved the application of an instrument to verify self-assessment of post-intervention learning and students satisfaction in relation to using the application. The study site was a private Higher Education institution, in the city of Santos, São Paulo, Brazil. The sample consisted of 31 students, who met the inclusion criteria. The theoretical and practical evaluations underwent repeated measurement analysis by using Students t-test and the correlation of practical evaluation with accesses to the application was achieved through Pearsons correlation coefficient. Linear regression was also employed to identify the existence of variables associated with learning. The qualitative variables were shown in absolute and relative values and the quantitative ones were shown in central tendency and dispersion values. RESULTS: The average pre- (4.10) and post- (5.57) intervention test values revealed a statistically significant difference in the theoretical knowledge degree, with p = 0.004. In the evaluation of practical skills through the OSCE, all stations showed a significant result, where stations 1 and 2 had p = 0.002 and station 3 had p = 0.000. Cross-comparison of the practical performance outcome and the number of accesses to specific screens for this purpose in the application showed no significant statistical difference. No statistically significant variables associated with learning were identified. Regarding self-learning and satisfaction, 95.7% of the students agreed that the application favored learning how to measure CVP. CONCLUSIONS: This research demonstrated the feasibility and effectiveness of using a technological resource, specifically designed for mobile devices and based on meaningful learning and constructivist pedagogy, as a support tool aimed at the teaching-learning process. This research opens prospects for further investigative routes and technological production studies capable of contributing to improve students education and practitioners work. It may also serve as an incentive for the creation of new study and research groups on Technology in Nursing.

Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Vita. / Bibliography: p. 200-205. / by Roger D. Kamm. / Ph.D.

The Relationship Between Central Venous Catheter and Post-operative Complications in Patients Undergoing Hepatic Resection David C. O’Connor, Ph.D., DNAP, CRNA A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at Virginia Commonwealth University Virginia Commonwealth University, 2018 Dissertation Chair: Clarence J. Biddle, Ph.D., CRNA Hepatic resection is indicated for primary and secondary malignancies. Use of a low central venous pressure technique is associated with decreased blood loss in these cases. This technique has evolved; central venous catheters and high dose morphine are no longer used, and patients are extubated earlier. The purpose of this study is to assess a relationship between these changes and outcomes. Central venous pressure has fallen out of favor as an accurate fluid measurement. Central venous catheters are associated with many complications. Outcomes in patients undergoing hepatic resection have improved over 20 years at one high volume institution. Guided by Donabedian’s theory of measuring outcomes, a non-randomized, non-experimental, retrospective, cohort design was conducted. The independent variables were intraoperative insertion of a central venous catheter, use of morphine, and time of extubation. The dependent variables were superficial and deep wound infections, number and severity of complications. The population sample is patients who submitted to partial hepatectomy at Memorial Sloan Kettering Cancer Center from 2007-2016. Data was obtained from hepatobiliary and anesthesia databases at Memorial Sloan Kettering Cancer Center. Data of 2518 from a possible 3903 patients were analyzed with chi square, univariate, Poisson and multivariate regressions. Univariate analysis for presence of CVC was significant for 90-day mortality (p 0.013). Use of morphine was significant for superficial wound infection (p 0.035), and a decrease in complications (p <.001). Amount of morphine was associated with fewer severe complications (p <.001). Incidental findings included a relationship between gender, total amount of fluids and number of segments resected. The significance of CVC with 90-day mortality was eliminated with stepwise multivariate regression. The findings support the change in anesthetic practice with clinical significance. Incidental findings regarding fluids and segments are supported in the literature. Future research should include goal directed fluid therapy and investigation of the relationship between gender and outcomes.