A drop in the level of the uterus during the last weeks of pregnancy as the head of the foetus engages in the pelvis is known as:

Appeared in: DSSSB October 2024

Explanation

Lightening is the correct term for the descent of the fetal presenting part, usually the head, into the true pelvis.
This event typically occurs in the last few weeks of pregnancy, particularly in women who are pregnant for the first time (primigravidas).
The primary maternal sensation is a feeling of the baby 'dropping', which relieves pressure on the diaphragm (making breathing easier) but increases pressure on the bladder (leading to frequent urination).

Option A: Ballottement is a physical examination technique, not a spontaneous physiological event. It involves the examiner tapping the uterus to feel the fetus rebound.
Option B: Effacement refers to the thinning and shortening of the cervix in preparation for labor, not the descent of the entire uterus.
Option D: Quickening is the mother's first perception of fetal movement, which occurs much earlier in pregnancy (16-20 weeks) and is unrelated to the baby's position in the pelvis.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Terminology of physiological changes in late pregnancy as background academic context rather than a clinical decision trigger.
Nurses play a key role in educating expectant mothers about the signs of approaching labor. Explaining lightening helps manage patient anxiety and expectations.
When a patient reports symptoms associated with lightening (easier breathing, increased urinary frequency, pelvic pressure), the nurse can identify this as a normal progression of pregnancy, especially in first-time mothers.
It is important to differentiate lightening from the onset of active labor, as lightening can occur weeks before labor begins.

How to Approach the Question

First, break down the question stem to identify the key physiological event being described: a 'drop in the level of the uterus' as the 'foetus engages in the pelvis' in the 'last weeks of pregnancy'.
Next, recall the specific terminology used in obstetrics for the various signs and symptoms of pregnancy and labor.
Evaluate each option based on its definition.
Ballottement is an examination technique. Effacement relates to the cervix. Quickening is about fetal movement.
Conclude that 'Lightening' is the only term that accurately describes the fetus 'dropping' into the pelvis, which matches the question's description.

Concept Tested & Keywords

Concept Tested: Terminology of physiological changes in late pregnancy.
Stem keywords: drop in level of uterus, last weeks of pregnancy, head of foetus engages, pelvis
Lead-in keywords: is known as

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E6 Obstetrics Williams p. 20-37

Practise the full DSSSB October 2024

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