CVP is central venous pressure, usually the pressure in the right atrium and the thoracic segment of the superior and inferior vena cava. It can be measured to determine the patient’s blood volume, cardiac function status, and the combination of vascular tone.
Valves in the venous cavity and other mechanical factors can affect the judgment of blood volume and cardiac function. CVP measurement is usually used in clinical medicine for transfusion of fluids due to acute heart failure and cardiac patients, as well as for recording of critically ill patients and extracorporeal circulatory surgery.
The normal value of central venous pressure is 5~12cmH2O. Elevated central venous pressure will lead to heart failure, and if the blood volume is insufficient, it will lead to a central venous pressure lower than normal, and it is necessary to expand the blood volume through a large number of supplemental fluids, and exceeding the normal value indicates cardiac insufficiency.
The measurement of central venous pressure is applicable to patients who are in shock or in need of large amount of blood transfusion, usually choose the subclavian vein as the puncture point, the operation needs strict sterilization and local anesthesia, and the cannula should not be kept for more than 5 days, otherwise, it will lead to infection, and if the patient’s platelet is too low, it should be forbidden to operate.