By Nico Westerhof, Nikos Stergiopulos, Mark I.M. Noble
Snapshots of Hemodynamics: An relief for medical examine and Graduate schooling КНИГИ ;ЗДОРОВЬЕ Название: Snapshots of Hemodynamics: An relief for scientific learn 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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Sample text
The operating mean pressure of the individual patient, the vessels of hypertensive patients are found to have a higher incremental elastic modulus as compared with normal human subjects. However, this apparently increased stiffness in hypertensive patients is mainly the result of their higher blood pressure (see Chapter 27). Thus either a stress-strain graph should be made or the incremental elastic modulus should be compared at similar strains or stresses to be able to conclude if mechanical properties have changed or not.
Determination of the Young modulus In practice the Young modulus is often not measured directly, because isolated tissue samples without perfusion are not viable. Therefore, for hollow organs like heart and vessels, pressure-volume or, for vessels, pressure-diameter relations are determined. However, through the law of LaPlace, and accounting for geometry, the calculation of the Young modulus is feasible (Chapters 9 and 11). C. Elasticity of soft tissues in simple elongation. Am J Physiol 1967;28,1532-1544.
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. However, there is only one aorta and about arterioles, and since these arterioles all sprout (indirectly) from the single aorta we can consider them as in parallel.