RESUMEN
Twenty-four intraarterial digital subtraction angiography (IA-DSA) studies were performed in 23 renal transplant recipients for evaluation of possible postoperative complications. Ten patients had normal studies. Five patients had minimal (less than 50%) narrowing at the renal artery anastomosis and five had more severe stenoses. Three patients had vascular occlusions. IA-DSA results correlated well with findings at surgery and/or conventional angiography. The major advantage of IA-DSA is the small amount of contrast material needed to perform the study. IA-DSA is particularly well suited to the evaluation of vascular problems in renal transplant patients.
Asunto(s)
Trasplante de Riñón , Obstrucción de la Arteria Renal/diagnóstico por imagen , Arteria Renal/cirugía , Técnica de Sustracción , Adolescente , Adulto , Niño , Oclusión de Injerto Vascular/diagnóstico por imagen , Humanos , Arteria Ilíaca/diagnóstico por imagen , Riñón/irrigación sanguínea , Riñón/diagnóstico por imagen , Persona de Mediana Edad , Complicaciones Posoperatorias , Radiografía , Arteria Renal/diagnóstico por imagen , Obstrucción de la Arteria Renal/etiologíaRESUMEN
The application of digital coronary arteriography in the evaluation of patients with known or suspected coronary artery disease is considered. Digital imaging of coronary arteries and bypass grafts can augment 35-mm cineangiography and may eventually replace film for coronary arteriography. The clinical efficacy of both selective and nonselective digital coronary arteriography is not yet established, however, a number of advantages over 35 mm cine have now been delineated including high contrast sensitivity image subtraction and digital image processing. One particular advantage of digital coronary arteriography is the ability to perform an immediate quantitative analysis of coronary images providing a reliable and consistent measure of the significance of a stenotic lesion. Technical requirements for digital coronary arteriography include a high output X-ray generator, low noise television chain, a 512 X 512 digital image matrix, frame rates of at least 15 fps, and high data storage capacity of c500 megabytes. The utilization of digital coronary imaging as a supplement or in place of 35-mm cine angiography will provide improved coronary imaging and enable quantification for more accurate and clinically significant coronary artery imaging.
Asunto(s)
Angiografía/métodos , Angiografía Coronaria , Técnica de Sustracción , Angiografía/instrumentación , Computadores , Medios de Contraste , Puente de Arteria Coronaria , Enfermedad Coronaria/diagnóstico por imagen , Vasos Coronarios/anatomía & histología , Humanos , Espectroscopía de Resonancia Magnética , Tecnología Radiológica , Factores de Tiempo , Tomografía Computarizada por Rayos XRESUMEN
Computerized medical logic has been developed to calculate the patient-specific pretest likelihood of pleural fluid for radiographic examinations. This medical logic was determined by searching the computerized data base for clinical indicants which are found to differ between groups of patients with and without pleural fluid. By using a priori probabilities of pleural fluid and sequential application of Bayes' equation to revise the likelihood according to the presence of significant indicants, patient-specific likelihood were calculated. This medical logic was tested on a group of 591 patients with and without pleural fluid by radiographic evidence. The results indicated a sensitivity of 95% and a specificity of 81%.