ABSTRACT

This chapter discusses the path physiology and hemodynamics impairing normal function of the superficial and deep venous system. In the superficial venous system, the obstruction that occurs with thrombophlebitis is not a major consideration from a hemodynamic perspective. The mechanism of valvular incompetence and reflux in the superficial system, however, is of great importance because of both its hemodynamic effects and associated clinical sequelae. The deep veins are more important hemodynamically because they are responsible for a greater portion of the blood flow out of the leg. The concept of repairing or replacing non-functioning valves promised to immediately and directly restore their hemodynamic performance. The hemodynamics in the venous system are more complex than on the arterial side because flow is intermittent and the veins are collapsible. Flow within them is also dependent on both the effects of gravity/hydrostatic pressure and extrinsic muscle compression.