What maternal position can potentially contribute to fetal bradycardia?

The flattened supine position is associated with an increased risk of fetal bradycardia due to potential compression of the inferior vena cava (IVC). When a pregnant woman lies flat on her back, particularly later in pregnancy, the weight of the uterus can exert pressure on the IVC. This pressure can significantly alter blood flow, decreasing venous return to the heart and subsequently leading to reduced placental perfusion, which can result in decreased oxygen delivery to the fetus. The resultant oxygen deprivation may trigger fetal bradycardia as a compensatory response.

In contrast, the other positions, such as upright, left sidelying, and seated, generally do not lead to this risk of IVC compression. The left sidelying position, in particular, is often recommended as it enhances uteroplacental blood flow and minimizes any potential compression on major blood vessels. Therefore, understanding the implications of maternal positioning is crucial in monitoring and ensuring fetal well-being during labor and delivery.