Study On The Method For Noninvasive Measurement Of Venous Pressure

The vein is a part of the circulation system, and is the vessel system of draining blood to return the cardiac atrium. The venous system includes two parts: the vein of pulmonary circulation and the vein of general circulation. The vein of general circulation is classified the superficial vein and the deep vein. The functions of venous system are the passage for blood flowing back to heart and the storeroom of blood, and about 60-70% blood volume of the general circulation is in the vein. The change of venous volume can influence the blood volume of to return to heart and the blood distribution in body. The venous pressure is classified the peripheral venous pressure and central venous pressure (CVP). The venous pressure is a main index of the function of venous system. So, the measuring value of venous pressure become a important information that be needed by the process of diagnosis and treatment in many clinic specialty. The common index of venous pressure measurement is CPV. The method of measuring CPV is puncturing or cutting open peripheral vein (PV) and then inset a catheter to the superior vena cava or inferior vena cava that close right atrium. The normal value of CPV is 5-12cmH2O(0.49-1.18Kpa). The measurement of CPV is important for evaluating the blood volume and cardiac function. Now, because the measurement of CPV is more complex and invasive and may cause some...