Which mechanism of placental delivery is associated with more visible bleeding?

The Duncan mechanism is recognized for its association with more visible bleeding during placental delivery. This mechanism occurs when the placenta separates from the uterine wall in a way that the maternal surface (the side attached to the uterus) is delivered first. As this separation occurs, maternal blood vessels can be exposed and torn, leading to increased bleeding that may be more readily visible.

In contrast, the Schultz mechanism involves the fetal side of the placenta delivering first (the smooth side), which tends to lead to less visible bleeding since the maternal vessels are less likely to be disrupted during separation. The compressing and controlled mechanisms are terms that generally do not describe standard placental delivery methods, and they do not inherently relate to the visibility of bleeding, reinforcing the Duncan mechanism's distinctive characteristic concerning maternal hemorrhage.