A 38-week pregnant woman is admitted in labor. The on-duty nurse knows the right sequence of the mechanism of… - NORCET 2 - 2021 (shift-1)

NORCET 2 - 2021 (shift-1)

Obstetrics & Gynaecology

Easy

Appeared in: NORCET 2 - 2021 (shift-1)

Explanation

The process of a fetus passing through the birth canal involves a specific sequence of positional changes known as the cardinal movements of labor.
The complete and correct sequence is: Engagement, Descent, Flexion, Internal Rotation, Extension (which includes crowning), Restitution, External Rotation, and finally, Expulsion.
The selected option correctly lists a subset of these movements in the proper chronological order, starting with Engagement and progressing through Internal Rotation, Crowning, and the subsequent rotational movements of the head.

Option A: This option is incorrect because it starts with Restitution. Restitution is a movement that occurs after the head has already been delivered (crowned and extended), not before.
Option B: This option is incorrect as it begins with Restitution and External Rotation, which are late-stage movements. Furthermore, it places Internal Rotation and Crowning at the end, which is the reverse of the actual process.
Option C: This option is incorrect because it starts with Restitution and External Rotation. These movements happen after the head is born. Internal Rotation must occur before Crowning for the head to navigate the pelvic outlet.

Visual 1: Diagram - A series of illustrations showing the 8 cardinal movements of labor, depicting the fetus's journey through the maternal pelvis from engagement to expulsion.

Clinical Relevance

Nursing practice connection: Use the key finding related to Mechanism of Labor (Cardinal Movements) to guide bedside assessment, documentation, and the next nursing action.
Understanding the mechanism of labor allows the nurse to anticipate the progress of labor, assess for abnormalities (e.g., arrest of descent or rotation), and prepare for the next steps in delivery.
Monitoring the fetal heart rate is crucial during descent and internal rotation, as these movements can sometimes lead to cord compression.
During crowning, the nurse's role includes supporting the perineum to prevent tears, coaching the mother on pushing techniques, and preparing for potential immediate postpartum events like a nuchal cord.

How to Approach the Question

First, recognize that the question asks for the correct chronological order of events in the mechanism of labor.
Recall the cardinal movements of labor. A helpful mnemonic is: Every Darn Fetus Is Extremely Eager to Exit (Engagement, Descent, Flexion, Internal Rotation, Extension, External Rotation, Expulsion).
Examine the starting point of each option. Options A, B, and C all begin with 'Restitution,' which is a movement that happens late in the process, after the baby's head is born.
Based on this, eliminate options A, B, and C as they are clearly out of sequence.
Verify that the remaining option, D, lists its events (Engagement, internal rotation, crowning, Restitution, external rotation) in the correct chronological order according to the full sequence of cardinal movements.
Conclude that Option D is the only sequence presented in the correct order.

Concept Tested & Keywords

Concept Tested: Mechanism of Labor (Cardinal Movements)
Stem keywords: mechanism of labor, sequence, 38-week pregnant, labor
Lead-in keywords: right sequence
Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.
Negative lead-in flag: false

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