[Concepts of basic physics that every cardiovascular surgeon should know: part I - mechanics of fluids].
The professional activity that the cardiovascular surgeon performs is much more than a simple gesture to mechanically operate the patient's heart. There is in every act of intraoperative most notions of physiology and physics than we generally realize. This paper discusses, in the light of mathematics, on the dynamics of fluids, ie blood, focused on invasive measurements of blood pressure, the effect of vessel size on its internal resistance and the flow passing through it in conversion of various units of measurements of pressure and resistance, blood viscosity and its relationship to the vessel, hemodilution, differences in laminar and turbulent flow, velocity and blood pressure and wall tension after a stenosis and the origin of poststenotic aneurysm. This study is not to enable the reader to the knowledge of all physics, but to show it as a useful tool in explaining phenomena known in the routine of cardiovascular surgery.
Oliveira
Marcos Aurélio Barboza de
MA
Doutorando da Faculdade de Medicina de São José do Rio Preto. m_aurelio@sbccv.org.br
Alves
Fernanda Tomé
FT
Silva
Marcos Vinícius Pinto e
MV
Croti
Ulisses Alexandre
UA
Godoy
Moacir Fernandes de
MF
Braile
Domingo Marcolino
DM
D000465:Algorithms; D001783:Blood Flow Velocity; D013504:Cardiovascular Surgical Procedures / Q000193:education*; D006400:Hematocrit; D006439:Hemodynamics / Q000502:physiology*; D018056:Hemorheology / Q000502:physiology; D006801:Humans; D006874:Hydrostatic Pressure; D010825:Physics; D014655:Vascular Resistance / Q000502:physiology