During delivery, on vaginal examination, palpation of fetal blood vessels lying in front of the fetal presenting part through intact membrane is known as?

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2019

Explanation

Vasa previa is the condition where unprotected fetal blood vessels run within the amniotic membranes and cross over the internal cervical os.
The question describes the classic clinical finding of vasa previa: palpating these pulsating vessels through intact membranes during a vaginal examination.
These vessels are not protected by Wharton's jelly of the umbilical cord or by placental tissue, making them extremely vulnerable to rupture or compression.
Rupture of these vessels, often occurring with membrane rupture, can lead to rapid fetal exsanguination and is a dire obstetric emergency.

Option A: Cord prolapse involves the umbilical cord descending past the presenting part, and it occurs after the membranes have ruptured. The question specifies intact membranes and something in front of the presenting part.
Option B: Cord presentation involves feeling the entire umbilical cord (a soft, rope-like structure) between the presenting part and the intact membranes. The question specifically mentions palpating 'fetal blood vessels,' which are thin and thread-like, characteristic of the unprotected vessels in vasa previa.
Option C: Placenta previa is when the placenta itself is implanted over or near the internal cervical os. On examination, one would feel spongy placental tissue, not distinct, pulsating blood vessels.

Clinical Relevance

Nursing practice connection: Knowing Obstetrical emergencies related to placental and umbilical cord abnormalities helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Vasa previa is a critical obstetric emergency requiring immediate recognition and management to prevent fetal death.
A key nursing responsibility is to avoid iatrogenic rupture of membranes if vasa previa is suspected. Any vaginal examination should be performed with extreme caution.
Nurses must be prepared for an emergency cesarean section, which includes notifying the full surgical and neonatal team, ensuring IV access, and providing emotional support to the patient.

How to Approach the Question

First, dissect the question stem for key defining terms: 'palpation', 'fetal blood vessels', 'in front of the fetal presenting part', and 'intact membrane'.
Evaluate each option against these specific criteria.
Recognize that 'intact membrane' immediately makes 'Cord prolapse' unlikely, as prolapse typically occurs after rupture.
Differentiate between 'Placenta previa', 'Cord presentation', and 'Vasa previa'. The term 'fetal blood vessels' is the most specific clue.
Placenta previa involves the entire placenta, not just vessels. Cord presentation involves the entire umbilical cord. Vasa previa specifically involves unprotected vessels.
Conclude that the palpation of thin, pulsating vessels (not the whole cord or placenta) in front of the presenting part with intact membranes is the classic description of vasa previa.

Concept Tested & Keywords

Concept Tested: Obstetrical emergencies related to placental and umbilical cord abnormalities.
Stem keywords: vaginal examination, palpation, fetal blood vessels, in front of the fetal presenting part, intact membrane
Lead-in keywords: known as

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E6 Obstetrics Williams pp. 13-28, 40-58

E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 19-27

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