The reasons of lower extremities chronic venous insufficiency are:
1) Insufficiency of the left atrium
2) Mechanical interference of blood reflow from lower extremities
3) Insufficiency of the right atrium
4) Insufficiency of valves of deep and subcutaneous veins of lower extremities
5) Insufficiency of perforant vein valves
The correct answer is:
A. 4.
B. 1.,4.
C. 2.,4.,5.
D. 2.,3.,4.,5.
E. All answers are correct
Answer: D. 2.,3.,4.,5.