Why is the supine position generally avoided in pregnant women?

The supine position is generally avoided in pregnant women primarily because it compresses the inferior vena cava, which can significantly impact blood circulation. When a woman lies on her back, the weight of the growing uterus can press down on the inferior vena cava, a large vein that carries deoxygenated blood from the lower body to the heart. This compression can lead to reduced venous return, potentially causing a drop in blood pressure and reduced blood flow to the fetus, leading to complications.

In this context, maintaining optimal blood flow is crucial for both maternal and fetal well-being. Alternatives to the supine position, such as lying on the side, particularly the left side, are recommended as they help to alleviate pressure on the inferior vena cava while also improving overall circulation. This adjustment supports better oxygen and nutrient delivery to the fetus and can also enhance maternal comfort during pregnancy.