Vacuum may be thought of as the absence of pressure. It is the measure of negative pressure between standardized atmospheric pressure and a theoretically perfect vacuum.

This effect is related to the therapeutic effect of the product in reducing blood pressure, and therefore is not necessarily a reason to stop therapy in the absence of other signs.

Result: Left lower limb DVT was more than right one apparently and the main manifestations were echo of DVT, incompressibility of the vein with probe pressure, absence of flow signal, and so on.