Low central venous pressure

Introduction Low central venous pressure refers to blood pressure in the right atrium and the large thoracic cavity is less than the normal value of 0.49-1.18Kpa (5-12cmH2O).

Cause

Low blood volume, dehydration, decreased peripheral vascular tone, etc. can cause central venous pressure to be low.

an examination

Related inspection

Central venous pressure measurement (CVP) blood pressure cardiac output (CO)

The central venous pressure was measured to be less than the normal value of 0.49 kPa.

The blood pressure in the right atrium and the large thoracic vein is called central venous pressure. The level of central venous pressure depends on the correlation between cardiac ejection capability and venous return. If the heart has a strong ability to eject blood, the blood flowing back into the heart can be injected into the artery in time, and the central venous pressure is lower. Central venous pressure is another indicator of cardiovascular function. Clinically, in the treatment of shock with infusion, in addition to observing changes in arterial blood pressure, we must also observe changes in central venous pressure. The normal range of central venous pressure is 4 to 12 cm H2O. If the central venous pressure is low or has a downward trend, it is often suggested that the infusion volume is insufficient.

Differential diagnosis

Differential diagnosis of low central venous pressure:

The venous return rate is increased: the central venous pressure is also increased when the venous return rate is increased. Therefore, the central venous pressure may increase in the case of an increase in blood volume, systemic venous contraction, or elevation of peripheral venous pressure due to relaxation of the micro-arteries. A trend in which the central venous pressure is higher than normal and has a progressive increase suggests that the infusion is too fast or the cardiac ejection function is incomplete.

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