The first stage of labour is characterized by?

Appeared in: AIIMS Patna NO - 2020

Explanation

The first stage of labor is defined as the period from the onset of regular uterine contractions to complete cervical dilatation (10 cm).
This stage's primary purpose is to prepare the birth canal by thinning (effacement) and opening (dilatation) the cervix.
It is the longest stage of labor and is subdivided into three phases: latent, active, and transition.
The end of the first stage is marked by the cervix being fully dilated, which allows the second stage (fetal expulsion) to begin.

Option A: Crowning of the head is a key event of the second stage of labor, not the first. It signifies that the birth of the baby is imminent.
Option B: The expulsion of the fetus is the definition of the second stage of labor, which begins only after the first stage (full cervical dilatation) is complete.
Option D: The delivery of the placenta defines the third stage of labor. This stage occurs after the baby has been delivered.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The question tests the knowledge of the defining characteristics of the stages of labor, specifically the first stage as background academic context rather than a clinical decision trigger.
Nurses must accurately identify the stage of labor to provide appropriate care, such as pain management, fetal monitoring, maternal support, and preparing for delivery.
Recognizing deviations from the normal progression, like a prolonged first stage (arrest of dilatation), is critical for timely intervention to prevent maternal and fetal complications.
What if? If a woman in the active phase of the first stage shows no cervical change for over 4 hours despite adequate contractions, it is termed 'active phase arrest.' This requires assessment for potential causes (e.g., cephalopelvic disproportion) and may necessitate interventions like oxytocin augmentation or cesarean delivery.

How to Approach the Question

First, identify the core concept of the question, which is the 'first stage of labour'.
Recall the definitions of the different stages of labor.
The first stage is primarily about the cervix opening (dilatation).
The second stage is about pushing the baby out (expulsion).
The third stage is about delivering the placenta.
Evaluate each option against these definitions. 'Dilatation of cervix' is the only option that correctly describes the primary event of the first stage.

Concept Tested & Keywords

Concept Tested: The question tests the knowledge of the defining characteristics of the stages of labor, specifically the first stage.
Stem keywords: first stage, labour, characterized by
Lead-in keywords: FIRST

QcnxIOE8G-R5iFrsEhA_l3

E6 Physiology Guyton 4SAE Part 3 p. 67-69

E6 Obstetrics Williams pp. 8-23, 9-26

Practise the full AIIMS Patna NO - 2020

Attempt every question from this paper in a timed mock, then review the full solution for each one.