By Jeroen J. Bax, Christopher M. Kramer, Thomas H. Marwick, William Wijns

;Cardiovascular Imaging: A guide for medical perform КНИГИ ;ЗДОРОВЬЕ Название: Cardiovascular Imaging: A guide for scientific perform // Методы визуализации ССС Автор: Jeroen J. Bax (Editor), Christopher M. Kramer (Editor), Thomas H. Marwick (Editor), William Wijns (Editor) Издательство: Wiley-Blackwell Год: 2005 Формат: PDF Размер: 4.80 Mб Качество: ХорошееКнига основана на применении неинвазивных методик визуализации в клинической кардиологии. Основной посыл заключается в использовании различных диагностических комплексов, основанных на методах визуализации, в обычной практике врача-кардиолога. Затронуты многие проблемы патологии сердца, такие как болезни клапанного аппарата, ИБС, болезни миокарда и перикарда и их диагностика с помощью эхокардиографии, компьютерной томографии и магнитно-резонансной томографии.Скачать c Скачать c Скачать c .com zero

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Saunders, Philadelphia, 2002: 65–87. 6 Redfield MM, Jacobsen SJ, Burnett JC Jr, Mahoney DW, Bailey KR, Rodeheffer RJ. Burden of systolic and diastolic ventricular dysfunction in the community: appreciating the scope of the heart failure epidemic. JAMA 2003;289:194–202. 7 Fedak PW, Verma S, David TE, Leask RL, Weisel RD, Butany J. Clinical and pathophysiological implications of a bicuspid aortic valve. Circulation 2002;106:900–4. 8 Rosenhek R, Klaar U, Schemper M, Scholten C, et al. Mild and moderate aortic stenosis: natural history and risk stratification by echocardiography.

Because MR initially leads to a hyperkinetic ventricle by increasing preload and decreasing afterload, even a low-normal ejection fraction (less than 60%) should be taken as a sign of beginning contractile dysfunction. Exercise ejection fraction may be used to unmask latent contractile dysfunction. e. 12 With state-of-the-art echocardiographic equipment most if not all these data can be acquired from the transthoracic echo. In patients difficult to image or with questionable results, transesophageal echocardiography is the next diagnostic step.

As calcification and fibrosis (or commissural fusion with rheumatic disease) progress, leaflet motion becomes restricted, eventually resulting in restriction of valve opening area. This progressive narrowing results in an increasing antegrade velocity of blood flow across the valve, corresponding to a pressure gradient between the left ventricle and aorta during systole. The constrained orifice and the high-velocity jet form the basis for assessment of aortic stenosis severity. 2 Imaging also is important to exclude other causes of outflow obstruction, such as a subaortic membrane or obstructive hypertrophic cardiomyopathy.

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