By Nico Westerhof, Nikos Stergiopulos, Mark I.M. Noble
Snapshots of Hemodynamics: An relief for scientific learn and Graduate schooling КНИГИ ;ЗДОРОВЬЕ Название: Snapshots of Hemodynamics: An reduction for medical study and Graduate schooling Автор: Westerhof, Nico Stergiopulos, Nikos Noble, Mark I.M. Издательство: Springer Год: 2005 Формат: PDF Размер: 15.43 Mб Качество: Хорошее Язык: английскийДанное издание предназначено для студентов-медиков и исследователей с целью облегчения понимания основ гемодинамики. Издание хорошо иллюстрировано.Скачать c turbobit.net Скачать c uploading.com Скачать c .com eighty five 1 2 three four five
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The Fractional Flow Reserve, FFR, is the ratio of the maximal flow with the stenosis present and maximal flow in the unaffected bed, The FFR depends on the stenosis severity and how much the distal bed can dilate. The FFR is close to the ratio of the distal pressure and proximal pressure, The, nonlinear, relation between pressure drop over the stenosis and flow through it, depends on the stenosis severity only. Angiographic data often do not give accurate information about the functional aspects of a stenosis or coarctation.
Of the resistances. This rule can be derived as follows. , and flow is the same through both. Thus Thus, in general, and the total resistance is the sum and thus larger than each individual resistance. Physical reason why the resistance is located in the arterioles We first compare the resistance of the aorta with the resistance of an arteriole using Poiseuille’s law. 5 micrometer and a length of 1 mm we can estimate the resistance ratio of these two. , Thus the resistance of a single arteriole is as large as that of a 50 cm long aorta.
3. Solomon SB, Nikolic SD, Glantz SA, Yellin EL. Left ventricular diastolic function of remodeled myocardium in dogs with pacing induced heart failure. Am J Physiol 1998;274: H945-954. IN LEFT VENTRICULAR DIASTOLIC FILLING inertia plays a role. Flow is still forward, but decelerates, while the pressure difference between atrium and ventricle reverses. Adapted from , used by permission. Chapter 8 OSCILLATORY FLOW THEORY Description The pressure-flow relation for steady flow, where only frictional losses are considered (resistance, law of Poiseuille), and the relation between oscillatory or pulsatile pressure and flow when only blood mass (inertance) is taken into consideration, are simplifications of reality.