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No description available.

Magnetic resonance imaging is often used as a source for reconstructing vascular anatomy for the purpose of computational fluid dynamics (CFD) analysis. We recently observed large discrepancies in such “image-based” CFD models of the normal common carotid artery (CCA) derived from contrast enhanced MR angiography (CEMRA). A novel quantitative comparison of velocity profile shape of N=20 cases revealed an average 25% overestimation of velocities by CFD, attributed to a corresponding underestimation of lumen area in the CEMRA-derived geometries. We hypothesized that this was due to blurring of edges in the images caused by dilution of contrast agent during the relatively long elliptic centric CEMRA acquisitions, and confirmed this with MRI simulations. CFD simulations incorporating realistic inlet velocity profiles and non-Newtonian rheology had a negligible effect on velocity profile skewing, suggesting a role for other sources of error or modeling assumptions.

Magnetic resonance imaging is often used as a source for reconstructing vascular anatomy for the purpose of computational fluid dynamics (CFD) analysis. We recently observed large discrepancies in such “image-based” CFD models of the normal common carotid artery (CCA) derived from contrast enhanced MR angiography (CEMRA). A novel quantitative comparison of velocity profile shape of N=20 cases revealed an average 25% overestimation of velocities by CFD, attributed to a corresponding underestimation of lumen area in the CEMRA-derived geometries. We hypothesized that this was due to blurring of edges in the images caused by dilution of contrast agent during the relatively long elliptic centric CEMRA acquisitions, and confirmed this with MRI simulations. CFD simulations incorporating realistic inlet velocity profiles and non-Newtonian rheology had a negligible effect on velocity profile skewing, suggesting a role for other sources of error or modeling assumptions.

Cardiovascular disease (CVD) is a progressive disease that presents signs, such as abnormal thickening or stiffening of arteries, early in its preclinical stage, and screening tools such as carotid intima media thickness (CIMT) measurement and pulse wave velocity (PWV) assessment have the potential to identify individuals prior to the clinical manifestation of CVD. The purpose of this study was to determine the prevalence of preclinical atherosclerosis, as indicated by high CIMT and PWV values, in an adult population aged 40-70 years and free of diagnosed CVD using these screening tools. Secondarily, this study aimed to compare established CVD risk factors and other health parameters between those with elevated or normal arterial health values. Sixty subjects made 2 visits to the Ball State University Human Performance Laboratory. The first visit included basic anthropometric measurements as well as assessment of CIMT and PWV. After a one week objective physical activity assessment, subjects returned to the HPL for assessment of blood lipids and body composition via dual energy x-ray absorptiometry scan. Prevalence of preclinical atherosclerosis was calculated from the total sample as well as within both genders, and an independent samples t-test was conducted in order to identify significant differences in health characteristics between those in the normal and high groups. Abnormal CIMT or PWV values were present in 43% of study subjects; 30% and 18% of the test sample met the criteria for elevated CIMT and PWV, respectively. Significant differences existed between normal and high CIMT and PWV study groups for physical activity, body composition, and blood lipid profile variables. Comparisons within each gender revealed differences in health profile elements. Both the CIMT and PWV measurement techniques may be valuable additions for community CVD screenings, as certain health profile abnormalities may impact each marker of arterial health differently. Additional research is needed in order to determine the cost-effectiveness of these screening tools as a preventive health method. / School of Physical Education, Sport, and Exercise Science

Diss. (sammanfattning) Örebro : Örebro universitet, 2006. / Härtill 4 uppsatser.

Thesis (M.S.)--Ball State University, 2009. / Title from PDF t.p. (viewed on June 07, 2010). Includes bibliographical references.

Thesis (Ph. D.)--University of Washington, 2007. / Vita. Includes bibliographical references (leaves 132-143).

Orientador: Winston Bonetti Yoshida / Resumo: Objetivo. A presente revisão se propõe a comparar a eficácia e segurança da angioplastia com stent versus angioplastia percutânea transluminal nas lesões sequenciais através dos desfechos: taxa de abertura do vaso (TICI 2b/3), evolução neurológica (mRs < 2) e taxa de hemorragia sintomática (hematoma grau II). Método. Utilizando como base de dados o PubMed, Scopus, Embase, SciELO/LILACS e outros, a presente revisão sistemática foi realizada até setembro de 2017 com base no PICO: (P) Pacientes com oclusão sequencial da carótida na fase aguda do AVCi tratados ou não com fibrinolítico endovenoso, (I) Angioplastia com stent, (C) Angioplastia percutânea transluminal, (O) TICI, mRs e hemorragia sintomática. As seguintes palavras chaves foram utilizadas: Stroke, Carotid Artery Injuries, Angioplasty, Stent and Safety. Aos artigos encontrados, os critérios de seleção do PRISMA foram aplicados, sendo realizada a análise qualitativa através do cheklist do NIH for before-after studies with no control group e a análise quantitativa através do programa Statdirect. Resultados. Identificados 228 artigos que após ajustes e exclusões restaram 29 para a análise qualitativa e quantitativa. TICI após CAS 0,76 (95% CI = 0,72 a 0,79); I2 = 36,9% versus PTA 0,71 (95% CI = 0,61 a 0,81); I2= 28,5%. mRs < 2 em 90 dias após CAS 0,47 (95% CI = 0,43 a 0,51) ); I2 = 3% versus PTA de 0,46 (95% CI = 0,36 a 0,57) ); I2 = 18,7%. Taxa de hemorragia sintomática após CAS 0,08 (95% CI = 0,06 a 0,10); I2 = 5,3%) ver... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Objective: Compare carotid angioplasty and stent (CAS) versus percutaneous transluminal angioplasty (PTA) measuring the efficacy and safety through Thrombolysis in Cerebral Infarction scale (TICI 2b/3), modified Rankin scale (mRs <2) and symptomatic haematoma (PH2). Method: Using the PubMed and others database, we searched for articles publish until setember 2017. The PRISMA criteria was used and rigorous eligibility were applied. The article quality was assessed by a checklist of “Quality Assessment Tool for Before-After (Pre-Post) Studies With No Control Group published" by NIH and proportional meta-analysis was performed by Statdirect software. Results: 228 articles were identified from the databases, after adjustments due to duplicates and submitted to the eligibility criteria, 29 articles with 1339 patients remained for the qualitative and quantitative analysis. TICI 2b/3 value after CAS was 0,76 (95% CI = 0,72 to 0,79); I2 = 36,9% versus PTA 0.71 (95% CI = 0.61 to 0.81); I2= 28,5%, mRs < 2 in 90 days after CAS 0.47 (95% CI = 0.43 to 0.51) ); I2 = 3% versus PTA 0.46 (95% CI = 0.36 to 0.57) ); I2 = 18,7% and symptomatic haematoma 0,08 (95% CI = 0,06 to 0,10) ); I2 = 5,3% versus PTA 0,06 (95% CI = 0,02 to 0,13); I2 = 35,5% showed no statistical difference. Other analyses of subgroups were done, including the effect of tPA with antiplatelet drugs. Conclusion: CAS is effective and safe when compared to PTA in the outcomes TICI 2b/3, mRs < 2 and PH2. A randomized clinical ass... (Complete abstract click electronic access below) / Doutor