"Calculation of the inspiratory collapse rate of the inferior vena cava: (Max D-Min D)/Max D×100%." Seeing Principal Zhang's blank expression, Zheng Ren explained directly.
"Place the probe under the sword and tilt it to the right. The scanning plane is parallel to the inferior vena cava. The image shows the right atrium, inferior vena cava and hepatic vein.
Under normal conditions, the inferior vena cava collapses significantly with deep inspiration. The diameter of the inferior vena cava is ≤2.1 cm and the inspiratory collapse rate is >50%, which is 3 mmHg.
When the right atrial pressure increases, the diameter can be >2.1 cm and the inspiratory collapse rate is