What is the significance of central venous pressure

Central venous pressure is an important indicator, which mainly refers to the pressure generated by the superior and inferior vena cava entering the right atrium. It plays an important role in many diseases and cardiac function tests. Just like other indicators, we try to learn as much as possible and have our own judgment in this regard. So, what is the significance of central venous pressure? Let’s take a closer look at it.

Central venous pressure can be used clinically as an indicator of fluid replacement rate and amount.

Volume loading test - can be used as a treatment reference for patients with high CVP but still clinical manifestations of insufficient cardiac output. If 500 ml of fluid is rapidly infused within 20 minutes, and CVP does not increase significantly or even decreases; at the same time, blood pressure increases and heart rate decreases, it indicates that the patient has absolute or relative volume deficiency and the heart has the potential to continue to accept large amounts of infusion; otherwise, infusion must be cautious.

Determination of CVP is important for understanding effective circulating blood volume and cardiac function.

The magnitude of central venous pressure depends on the relationship between the heart's ejection capacity and the amount of venous blood returning to the heart. If the heart has a strong ejection capacity and can eject the blood returning to the heart into the arteries in time, the central venous pressure will be low. On the contrary, decreased ejection capacity due to heart failure and other reasons will lead to higher central venous pressure. Central venous pressure indicates the return of venous blood to the central vein and right atrium, but does not directly reflect blood volume. If CVP cannot be obtained due to etiology, the inferior vena cava under the diaphragm can also be measured instead of central venous pressure. Changes in central venous pressure generally occur earlier than changes in arterial pressure.

If the central venous pressure is less than 0.49 kPa, it means insufficient right atrium filling or insufficient blood volume; when the central venous pressure is greater than 1.47 kPa (15 cmH2O), it indicates heart failure, excessive contraction of the venous vascular bed, or increased pulmonary circulation resistance; if the CVP exceeds 1.96 kPa (20 cmH2O), it indicates congestive heart failure.

The above is an introduction to the significance of central venous pressure. I hope it will help you understand it. Central venous pressure is a relatively important examination item. When you suffer from related diseases, you can go to a regular hospital and take this method of testing. Once there are any abnormalities, you should actively communicate with the doctor and receive further treatment to prevent more serious consequences.