Navegando por Palavras-chave "Angiography"
Agora exibindo 1 - 9 de 9
Resultados por página
Opções de Ordenação
- ItemAcesso aberto (Open Access)Análise radiológica da veia cava caudal em ratos Wistar(Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia, 2004-10-01) Schmidt, Luciano Rodrigues; Cardoso, Edson José [UNIFESP]; Schmidt, Rogério Rodrigues; Silva, Carlos Alberto Justo E [UNIFESP]; D'acampora, Armando José; Universidade Federal de Santa Catarina Hospital Universitário; Universidade Federal de São Paulo (UNIFESP)PURPOSE: To present an angiographic method, to visualize the cava and iliac veins in rats, emphasizing the colateral circulation, developed after interrupting the venous flow. METHODS: Twenty four male Wistar rats were studied, weighting 300 to 350g. the access used to injection of the iodined contrast, necessary to the radiologic study, was the dorsal vein of the penis. The method of cavography was tested at the 15th postoperative day, in three groups of six animals. RESULTS: The group I is control. In groups II and III the animals were submitted respectively of ligature of the caudal vena cava above and below of the iliolumbar veins. In group IV they were submitted to the ligature of the right iliac vein, besides of control group that was not operated. CONCLUSION: The cavography with the injection in the penile vein, is capable of viewing the iliac vein and caudal vena cava, as well as the colateral circulation developed in cases the blood flow was interrupted in these vessels.
- ItemAcesso aberto (Open Access)Angiografia por ressonância magnética: aspectos técnicos de um método de estudo vascular não-invasivo(Colégio Brasileiro de Radiologia e Diagnóstico por Imagem, 2004-02-01) Caldana, Rogério Pedreschi [UNIFESP]; Bezerra, Alexandre Sérgio de Araújo [UNIFESP]; Soares, Adriano Fleury de Faria; D'Ippolito, Giuseppe [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); Complexo Hospitalar São LuizEarly magnetic resonance angiography techniques used flow-sensitive sequences to obtain contrast of the vascular structures. Three techniques are based on this approach: phase-contrast, time-of-flight and black blood techniques. However, these acquisition methods are time-consuming and more susceptible to movement artifacts, flow-related artifacts and signal loss due to stenotic lesions. They also present low sensitivity for slow flow detection. The use of paramagnetic contrast medium in magnetic resonance angiography studies provides a simple and quick way of obtaining vascular enhancement. Image contrast is based on vascular enhancement in opposition to background suppression. Important factors for the technical improvement of gadolinium-enhanced magnetic resonance angiography include modern techniques of central k-space ordering that are responsible for high image contrast, and implementation of appropriate timing injection. Gadolinium-enhanced magnetic resonance angiography is a useful diagnostic tool for investigation of anatomical anomalies, stenotic and occlusive disease, and surgical complications, particularly in patients with organ transplants. Gadolinium-enhanced magnetic resonance angiography has the advantage of a noninvasive method since it does not require ionizing radiation or an iodine contrast medium, and allows the evaluation of parenchymatous structures for additional diagnostic information.
- ItemAcesso aberto (Open Access)Angiografia rotacional com reconstrução tridimensional (3D-RA) como ferramenta diagnóstica em pacientes com estenose da artéria do rim transplantado(Sociedade Brasileira de Hemodinâmica e Cardiologia Intervencionista - SBHCI, 2011-03-01) Souza, Rodrigo Almeida [UNIFESP]; Barbosa, Adriano Henrique Pereira [UNIFESP]; Pimentel, Leandro Caetano [UNIFESP]; Furini, Fábio Rodrigo [UNIFESP]; Sousa, José Marconi De Almeida [UNIFESP]; Pestana, Jose Osmar Medina [UNIFESP]; Lima, Valter Correia de [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)BACKGROUND: Transplant renal artery stenosis (TRAS) is the major vascular complication associated to adverse events in patients with kidney grafts, whose incidence ranges from 1% to 23%. Angiography is the gold-standard for diagnosis, enabling immediate treatment; however, due to the variable anatomy and location of anastomosis, additional projections are often required, leading to greater exposure to contrast medium and radiation. Tridimensional rotational angiography (3D-RA) appears as a tool for diagnosis and treatment of TRAS. The aim of this paper was to evaluate the accuracy of measurements obtained by 3D-RA in comparison to conventional angiography. METHODS: From April, 2010 to January, 2011, 41 3D-RAs were performed in patients with clinical suspicion of TRAS. Images were analyzed by independent observers; conventional angiography measurements were obtained online and 3D-RA measurements were obtained offline with the Philips Allure 3D-RA software. RESULTS: Thirty-five 3D-RAs (84%) were considered adequate for angiographic measurements, and 20% provided additional and relevant information for the therapeutic strategy. There was no statistically significant difference between measurements obtained from the reference diameter and minimal luminal diameter of the artery using 3D-RA and conventional angiography. In addition, there was a strong correlation between them CONCLUSIONS: 3D-RA comes up as a useful tool for TRAS diagnosis, providing accurate measurements and complementary and relevant information for the diagnosis and treatment, in addition to potentially reducing procedure time and exposure to contrast and radiation.
- ItemSomente MetadadadosAvaliação da vasculatura retiniana e coriocapilar por meio de angiografia por tomografia de coerência óptica(Universidade Federal de São Paulo (UNIFESP), 2021) Conti, Felipe Ferreira [UNIFESP]; Rodrigues, Eduardo Buchele [UNIFESP]; Universidade Federal de São PauloObjective: 1. To evaluate Optical Coherence Tomography Angiography (OCTA) repeatability in healthy patients, patients with diabetic retinopathy, vascular occlusions, macular degeneration and epiretinal membrane. 2. To evaluate OCTA's ability to identify choriocapillaris and retinal capillary changes in diabetic patients compared to patients without retinopathy. 3. To evaluate OCTA's ability to identify changes in vascular parameters in patients with diabetic macular edema (DME) undergoing treatment with anti-vascular endothelial growth factor (anti-VEGF). Methods: the study was divided into 3 phases: 1. Evaluation of repeatability. Forty patients were divided into seven categories: healthy patients without retinopathy (control), retinal vascular occlusion, diabetic patients without retinopathy, diabetic patients with retinopathy, non-exudative age-related macular degeneration (AMD), exudative AMD and epiretinal membrane. Capillary perfusion density (CPD) and thickness measurements were taken 3 times using OCTA, with a 5-minute interval between them, assessed for repeatability by determining statistically significant differences and coefficient of variability (COV) between the measurements. 2. Evaluation of changes in choriocapillaris and retinal CPD in the eyes of diabetic patients compared with non-diabetic patients. Thirty-seven nondiabetic patients (controls), 31 diabetic patients without diabetic retinopathy (DM without DR), 41 patients with non-proliferative diabetic retinopathy (NPDR) and 27 with proliferative diabetic retinopathy (PDR) were examined and compared with each other. 3. To assess changes in retinal and choriocapillaris CPD after EMD treatment with antiVEGF. Nineteen control patients and 19 patients with EMD were assessed at baseline, 6 months and 12 months after anti-VEGF treatment for CPD assessment. Results: When assessing OCTA repeatability, no significant differences were found (p> 0.05) in any of the measurements within the same visit. The COV ranged from 0.26% to 52.76%, depending on the measurement configuration and the disease. Eyes with NPDR and PDR showed a statistically significant decrease in choriocapillaris CPD (p = 0.005 and p <0.001) compared with control, while DM without DR showed no statistically significant difference. Compared with controls, only eyes with PDR showed a statistically significant decrease (p <0.01) in retinal CPD, as well as an increase in foveal avascular zone (FAZ) (p = 0.001). Although OCTA is able to identify changes in the retinal and choriocapillaris CPD of diabetic patients compared to the control, after 12 months of anti-VEGF treatment, no statistically significant changes were observed in retinal CPD, choriocapillaris CPD (p = 0.5) and FAZ (p = 0.1). Conclusions: Our analysis demonstrated: 1. OCTA is a reliable tool in terms of repeatability in the evaluation of some retinal diseases, such as vascular occlusions, macular degenerations and diabetic retinopathy. 2. OCTA is able to detect changes in retinal CPD, choriocapillaris CPD and FAZ in DR. 3. OCTA was unable to observe changes in retinal and choriocapillaris CPD after intravitreal treatment with anti-VEGF in EMD patients.
- ItemAcesso aberto (Open Access)Cateterismo cardíaco, diagnóstico (angiografia) e terapêutico (angioplastia) na doença arterial coronária dos pacientes diabéticos(Sociedade Brasileira de Endocrinologia e Metabologia, 2007-03-01) Lima, Valter C. [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); FOR Hospital do Rim e HipertensãoScreening, diagnosis and revascularization of coronary artery disease (CAD) in type 2 diabetes mellitus are major challenges for current clinical practice. Diagnostic (angiography) and therapeutic (angioplasty) cardiac catheterization are important resources for the clinical assessment and management of coronary atherosclerosis. Anatomic peculiarities of CAD in diabetics can be well characterized by angiography, associated or not by intravascular ultrasound. The worse outcome following coronary revascularization procedures, either angioplasty or surgery, in diabetic is one of the main fields of clinical research. In spite of controversies, about one quarter of angioplasty and one third of surgical revascularization procedures are performed in diabetics. Two ongoing, large, randomized, multicentric trials are investigating the best management of CAD in diabetics. The BARI 2D trial is randomizing asymptomatic or mildly symptomatic patients with CAD for either medical therapy or revascularization (angioplasty or surgery, according to the best clinical judgment). The FREEDOM trial is randomizing stable patients with multivessel CAD for either angioplasty with drug eluting stents or surgery, with or without extracorporeal circulation. While the evidences are not available, in order to decide on the best revascularization procedure for individual patients, medical practice has been balanced according to a number of variables. Conditions that favor angioplasty: short lesions, lesions in large vessels, absence of left anterior descending artery disease, previous coronary bypass surgery and high surgical risk due to co-morbidities. Conditions that favor surgery: long lesions, lesions in small vessels, presence of left anterior descending artery disease and need for associated valve surgery.
- ItemSomente MetadadadosContribuição para o estudo anátomo-radiológico da origem da artéria ascendens, ramo cólico da artéria ileo-cólica(Universidade Federal de São Paulo (UNIFESP), 1981) Ures, Silvio [UNIFESP]; Prates, José Carlos [UNIFESP]
- ItemSomente MetadadadosCorrelação anatomopatológica, ecocardiográfica de cardiopatias congênitas na infância(Universidade Federal de São Paulo (UNIFESP), 1992) Ishigai, Marcia Marcelino de Souza [UNIFESP]; Patrício, Francy Reis da Silva [UNIFESP]
- ItemAcesso aberto (Open Access)Uso da angiografia rotacional 3D (3D-RA) em portadores de cardiopatias congênitas: experiência de 53 casos(Sociedade Brasileira de Hemodinâmica e Cardiologia Intervencionista - SBHCI, 2010-06-01) Kapins, Carlos Eduardo Bernini [UNIFESP]; Coutinho, Ralph Bittencourt [UNIFESP]; Barbosa, Fabiane Berruezo [UNIFESP]; Silva, Célia Maria Camelo [UNIFESP]; Lima, Valter Correa [UNIFESP]; Carvalho, Antonio Carlos [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)BACKGROUND: Advances in the diagnosis and treatment of congenital heart disease are associated to advances in imaging techniques. Anatomic images obtained by computed tomography scan, magnetic resonance imaging (MRI) and echocardiography have been useful but cannot provide accurate hemodynamic data. 3D rotational angiography (3D-RA) is a new 3D reconstruction method carried out in the cath lab that has been widely used in neurological and urological procedures. This study was aimed at evaluating the use of 3D-RA in the diagnosis and treatment of congenital heart disease METHOD: Review of catheterization results of patients with congenital heart disease referred for diagnostic assessment in which the 3D reconstruction method was employed. Philips Allure FD 10 equipment and low osmolarity contrast medium were used for angiographies RESULTS: Overall, 53 patients were reviewed and 2.2 ± 1.1 mL/kg of contrast medium were used per patient. Anatomic details not previously shown by 2D angiographies were observed in 23% of the patients. Furthermore, 3D-RA imaging was used to make treatment decisions in 49% of the patients. Exposure to radiation was not statistically different from 2D angiography. None of the patients had complications related to the method CONCLUSION: 3D-RA provided information not usually seen by conventional angiography which was useful in the treatment of selected patients with congenital heart disease. The use of 3D-RA may reduce the number of imaging tests per procedure and as a consequence, limit patient exposure to radiation and contrast media.
- ItemAcesso aberto (Open Access)Utilização de ferramentas para aquisição de imagens durante procedimentos diagnósticos em radiologia intervencionista como auxílio ao tratamento percutâneo(Universidade Federal de São Paulo (UNIFESP), 2017-08-31) Souza, Elson de Jesus [UNIFESP]; Carvalho, Antonio Carlos de Camargo [UNIFESP]; Barbosa, Adriano Henrique Pereira [UNIFESP]; http://lattes.cnpq.br/9509657393868053; http://lattes.cnpq.br/6569055379421505 ; http://lattes.cnpq.br/2978500710159471; Universidade Federal de São Paulo (UNIFESP)A angiografia rotacional tridimensional (3D-RA) é uma técnica de reconstrução, na qual a partir de imagens 2D,adquire-se um volume de imagens, fornecendo uma visão volumétrica, em três dimensões, do vaso a ser estudado. O principal objetivo do trabalho foi demonstrar a viabilização das etapas de pós-processamento de imagens digitais baseados em um modelo computacional, e auxiliar condutas médicas em relação a definição do diagnóstico e tratamento através de reformatações multiplanares. O estudo é uma análise retrospectiva e prospectiva de dados coletados de pacientes com rins transplantados que realizaram procedimentos de angiografia e angioplastia renal no serviço de Hemodinâmica e Cardiologia Intervencionista do Hospital São Paulo. Foi realizada análise dos dados referentes a 319 procedimentos, nos quais foram avaliados diversos parâmetros técnicos em comparação com critérios de avaliação previamente estabelecidos. A dose de entrada na pele (DAP) e o Kerma no ar, obtidos durante a realização dos procedimentos, também foram investigados e comparados com os limites estabelecidos pelas autoridades regulatórias. Este estudo permitiu demonstrar a eficiência da técnica 3DRA para aquisições e reconstruções de imagens tridimensionais durante o procedimento da angiografia e ou angioplastia do rim transplantado após otimização e implantação de um protocolo no qual todos os parâmetros técnicos foram otimizados.