The Diaphragm Pump; The Tonus Of The Vein Wall; Aponeuroses Of The Legs; Residual Arterial Pressure - Fscaresystems Viridex Rf Bedienungsanleitung

MANUEL
RF
Finally an increase in adipose tissue in the leg significantly increases the work of the muscular
pump (see the study by Dr Chardonneau of heaviness of the legs, revue de phlebology 1999)
The articular condition: each articular movement pushes venous blood towards the heart. It
follows that articular amplitude is a key factor in the expulsion of blood.

3.4.2. The diaphragm pump

The rhythm of venous blood return is controlled by respiration. The further we go into the large
veins (popliteal - femoral - iliac), the more this phased movement is felt. A Doppler reading
easily confirms this, in the decubitus position.
During inspiration, the diaphragm is drawn lower into the abdominal cavity as the volume of
the thorax increases. Thoracic pressure falls and the intra-abdominal pressure increases. This
effect tends to squeeze the inferior vena cava and to propel its contents towards the thorax.
The venous valves prevent any reflux towards the inferior members.
During expiration we find that the diaphragm rising into the thoracic cage is responsible for an
influx of venous blood into the inferior members of the abdominal cavity.

3.4.3. The tonus of the Vein Wall

This venous tonus depends on the sympathetic nervous system. The release of certain
chemical substances following stimulation of the adrenergic nerves results in contraction of the
vein wall. These vasomotor reflexes are especially common in the superficial veins. They do
not exist for the muscular veins.
Orthostatism, cold, stress, deep respiration, physical effort and hyperventilation increase the
venous tonus.
On the contrary, rest in the decubitus position, heat and the absorption of alcohol reduce it.
Certain medicinal products reduce the venous tonus: B-blockers, nitroglycerine, nitrate
derivatives, theophylline and barbiturates.
Finally, it is increased by non-compensated cardiac insufficiency.

3.4.4. Aponeuroses of the Legs

Their role is certainly underestimated.
Their resistance to variations in volume and pressure increases the effectiveness of the
muscular pump. It is not simply a passive envelope, but participates actively to the ejection of
blood from the deep veins.

3.4.5. Residual Arterial Pressure

This is what remains of the systolic propulsive force of the left ventricle after arterial flow to the
capillaries. It plays only a moderate role.
Date 27/03/2014
THERMOCOAGULATION – Viridex
Page 21 de 49 N° de révision : 05