What are the two phases of the second stage of labour?

Raj. CHO -2025

Obstetrics & Gynaecology

Easy

Appeared in: Raj. CHO -2025

Explanation

The second stage of labor begins with full cervical dilation (10 cm) and ends with the birth of the baby.
It is correctly divided into two distinct phases: the propulsive phase and the expulsive phase.
The propulsive phase involves the descent of the fetus through the birth canal, driven by uterine contractions, before the mother feels a strong urge to push.
The expulsive phase starts when the fetal head reaches the pelvic floor, triggering a powerful, involuntary urge for the mother to bear down and push, which leads to the expulsion of the fetus.

Option A: Active and Latent are the two phases of the first stage of labor, which is primarily concerned with cervical effacement and dilation.
Option B: While the second stage is characterized by both expulsion and contractions, 'contractive' is not a recognized term for a distinct phase.
Option D: Contraction and retraction describe the physiological action of the uterine muscle fibers (myometrium), where the upper segment thickens and shortens to push the fetus down. This is a mechanism, not a phase of a labor stage.

Visual 1: Diagram: Illustrating the four stages of labor, with a detailed focus on the propulsive and expulsive phases of the second stage.
Visual 2: Flowchart: Showing the progression from the first stage (latent and active phases) to the second stage (propulsive and expulsive phases), highlighting the key event of full cervical dilation as the transition point.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Phases of the second stage of labor as background academic context rather than a clinical decision trigger.
Recognizing the transition from the propulsive to the expulsive phase is crucial for nurses to guide the mother's pushing efforts effectively and provide appropriate support.
Encouraging pushing only during the expulsive phase, when the urge is reflexive and involuntary (Ferguson reflex), helps conserve maternal energy and prevents exhaustion.
What if? If a mother is coached to push forcefully during the propulsive phase (before the fetal head is on the pelvic floor), it can lead to premature maternal exhaustion and potential cervical edema, which could prolong the second stage of labor.

How to Approach the Question

This is a factual recall question testing knowledge of the stages of labor.
First, identify the core concepts in the question: 'second stage of labour' and its 'two phases'.
Recall the four stages of labor and their primary characteristics.
Differentiate the phases within each stage. Remember that the first stage has latent and active phases.
Recall that the second stage is specifically divided based on fetal descent and the maternal urge to push.
Evaluate the options: 'Propulsive' (descent) and 'Expulsive' (pushing) correctly describe the two parts of the second stage. Eliminate options that refer to the first stage (Active and Latent) or describe muscle actions (Contraction and Retraction).

Concept Tested & Keywords

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