Where does placental separation begin from the uterine wall as per the Schultze mechanism?

BTSC Staff Nurse 1 August-2025

Obstetrics & Gynaecology

Easy

Appeared in: BTSC Staff Nurse 1 August-2025

Explanation

The Schultze mechanism of placental separation begins at the center of the placenta.
This central separation leads to the formation of a retroplacental hematoma (a collection of blood behind the placenta).
The weight of the hematoma helps to peel the rest of the placenta away from the uterine wall.
As it descends, the placenta inverts, and the shiny fetal surface presents first at the introitus, which is why it's often called 'Shiny Schultze'.
The collected blood is typically expelled after the placenta is delivered.

Option B: The location of placental implantation (e.g., near the cervix) does not define the mechanism of separation. The Schultze mechanism is defined by a central separation pattern, regardless of where the placenta is attached.
Option C: Separation beginning at the periphery or edges describes the Duncan mechanism, not the Schultze mechanism. In the Duncan mechanism, blood trickles down between the membranes and uterine wall and is visible externally before the placenta is delivered.
Option D: While the placenta is most commonly implanted in the fundal region of the uterus, this describes the location of implantation, not the pattern of separation. The Schultze mechanism specifically refers to separation starting in the center of the placental mass.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Mechanisms of placental separation during the third stage of labor as background academic context rather than a clinical decision trigger.
Understanding the mechanism of placental separation helps the nurse or midwife anticipate the pattern of bleeding in the third stage of labor.
In a Schultze separation, a sudden gush of blood after the placenta delivers is expected. In a Duncan separation, a steady trickle of blood occurs before the placenta is delivered.
Regardless of the mechanism, the nurse must inspect the delivered placenta to ensure it is complete. Retained placental fragments are a major cause of postpartum hemorrhage.

How to Approach the Question

First, identify the core concept in the question, which is the 'Schultze mechanism' of placental separation.
Analyze the provided image. The image clearly labels and illustrates two distinct mechanisms. Observe the diagram for the Schultze mechanism, noting where the separation begins and how the blood collects.
The diagram shows the separation starting in the middle, with a blood clot forming behind the placenta.
Compare this visual information with the given options.
The option 'Center of the placenta' directly matches the visual depiction in the image and the definition of the Schultze mechanism.
Eliminate other options. 'Periphery' describes the Duncan mechanism, also shown in the image. 'Cervix' and 'fundus' describe locations of implantation, not mechanisms of separation.

Concept Tested & Keywords

Concept Tested: Mechanisms of placental separation during the third stage of labor.
Stem keywords: placental separation, uterine wall, Schultze mechanism
Lead-in keywords: Where
Negative lead-in flag: false

QlnMYbK5PWcop4dgsI18X6

E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 48-56