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Sagot :
During inspiration, a diameter decrease of the inferior vena cava (IVC) of 50% or more has been seen as a marker of normal central venous pressure.
What is the vena cava?
Large veins that convey deoxygenated blood to your heart so it may receive oxygen are called the superior vena cava and inferior vena cava. The biggest vein in your body, the inferior vena cava, returns oxygen-depleted blood from the lower half of your body to your heart (below your diaphragm).
Your heart receives oxygen-poor blood from your upper body through your superior vena cava, your second-largest vein. The vital job of the superior and inferior vena cava is to transport oxygen-poor blood to the right atrium of the heart, where it passes into the right ventricle and then travels to the lungs (through the pulmonary artery) to exchange carbon dioxide for oxygen.
Blood that has been oxygenated returns to the left atrium of your heart via your pulmonary veins. Blood that is now carrying brand-new oxygen then travels to your left ventricle and aorta before being distributed throughout your body.
Therefore, a diameter decrease of the inferior vena cava (IVC) of 50% or more is a marker of normal central venous pressure.
Read more about the vena cava, here
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