Gradient
compression delivers a squeezing to the leg that is
tightest at the ankle. The degree of squeezing or
compression gradually decreases up the leg. This
compression, generally expressed in mmHg (millimeters of
mercury) provides two main benefits.
A complete understanding of
precisely how compression works remains unknown. Two
actions are generally accepted. Probably the most
beneficial effects of compression are its effects on the
capillaries and tissue spaces.
Compression is believed to
increase the pressure in the tissues beneath the skin
thus reducing excess leakage of fluid from the
capillaries and increasing absorption of tissue fluid by
the capillaries and lymphatic vessels. Compression
therefore reduces and helps prevent swelling.
The physical presence of the
stocking also helps control the size (diameter) of
superficial veins beneath the stocking. The stocking
does not allow these superficial veins to over expand
with blood. This action helps prevent "pooling". The
venous blood then flows more quickly up the leg towards
the heart.
