A G3P2 female had 2 Caesarean sections. What is the risk of uterine rupture in this female?

NORCET 6 Prelims -2024

Obstetrics & Gynaecology

Easy

Appeared in: NORCET 6 Prelims -2024

Explanation

The risk of uterine rupture increases with each subsequent cesarean section.
For a woman with two prior low-transverse cesarean sections, the risk of uterine rupture during a trial of labor is generally cited between 0.9% and 1.8%.
Some clinical guidelines and studies suggest a broader range that can be as high as 3.7%, which makes the 2-3% option the most plausible choice among those provided.
This represents a significant increase (doubling or tripling) compared to the risk after only one prior cesarean section (0.2-0.9%).

Option B: This range is too high for a standard history of two low-transverse cesarean sections.
Option C: This is a very high risk and not typical for multiple low-transverse incisions.
Option D: This is an extremely high and factually incorrect percentage for uterine rupture risk in this context.

Visual 1: Diagram - An illustration comparing different types of uterine incisions (low-transverse, low-vertical, classical, T-shaped) and their corresponding locations on the uterus. This helps visualize why rupture risks differ.
Visual 2: Chart - A bar chart comparing the percentage risk of uterine rupture for one prior C-section, two prior C-sections, and a prior classical incision. This provides a clear visual comparison of the escalating risk.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The primary concept tested is the assessment of risk for uterine rupture during a Trial of Labor After Cesarean (TOLAC), specifically for a patient with a history of two prior cesarean sections as background academic context rather than a clinical decision trigger.
Understanding the risk of uterine rupture is critical for counseling patients on the choice between a Trial of Labor After Cesarean (TOLAC) and an Elective Repeat Cesarean Delivery (ERCD).
Nurses play a key role in monitoring patients during TOLAC for signs of uterine rupture, such as fetal heart rate abnormalities (most common sign), loss of fetal station, severe abdominal pain, and maternal hemodynamic instability.
Patient safety during TOLAC requires immediate access to emergency cesarean delivery facilities ('readily available').

How to Approach the Question

Identify the core question: It asks for the statistical risk of uterine rupture.
Identify the key patient factor: The patient has had two prior Caesarean sections.
Recall or look up the risk stratification based on the number and type of prior uterine incisions.
Recognize that risk increases with the number of prior sections. The risk for one low-transverse is the baseline (~0.5-0.9%).
Evaluate the options against the known data. The risk for two sections is higher than for one. The range of 0.9-1.8% (or up to 3.7% in some literature) is the target.
Select the option that best fits this data. 2-3% is the most reasonable choice, as other options represent risks for different, higher-risk scenarios (like classical incisions) or are factually incorrect.

Concept Tested & Keywords

Concept Tested: The primary concept tested is the assessment of risk for uterine rupture during a Trial of Labor After Cesarean (TOLAC), specifically for a patient with a history of two prior cesarean sections.
Stem keywords: G3P2, 2 Caesarean sections, uterine rupture, risk
Lead-in keywords: What is the risk
Clinical cues: History of two prior Caesarean sections is the key clinical factor determining the risk.

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