The type of pelvis most suited for delivery is?

AIIMS BBSR SNO - 2019

Obstetrics & Gynaecology

Easy

Appeared in: AIIMS BBSR SNO - 2019

Explanation

The Gynaecoid pelvis is considered the classic and most ideal female pelvis for childbirth.
As seen in the image, it has a rounded or slightly oval inlet, a spacious cavity, and a wide subpubic arch (90 degrees or more).
These features provide ample space for the fetal head to engage, descend, and rotate through the birth canal with minimal difficulty.
It is the most common type, found in approximately 50% of women, and is associated with the highest rate of uncomplicated vaginal deliveries.

Option A: The Platypelloid pelvis is flattened anteroposteriorly and wide transversely (kidney-shaped). This shape is unfavorable for vaginal delivery as the narrow anteroposterior diameter can obstruct the fetal head's descent.
Option C: The Anthropoid pelvis is oval-shaped with a wide anteroposterior diameter but a reduced transverse diameter. While vaginal delivery is possible, it often leads to an occiput-posterior position of the fetal head, which can prolong labor.
Option D: The Android pelvis is heart-shaped or triangular, similar to a male pelvis. It features a narrow fore-pelvis and a narrow subpubic arch, which can lead to difficult labor, deep transverse arrest, and often requires operative delivery.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Types of female pelvis and their obstetric significance as background academic context rather than a clinical decision trigger.
Understanding the different pelvic types is crucial for obstetricians and midwives to anticipate potential difficulties during labor and delivery.
Clinical or radiological assessment of the pelvis (pelvimetry) can help in planning the mode of delivery, especially in cases of suspected cephalopelvic disproportion (CPD).
What if? If a woman is known to have an Android or Platypelloid pelvis, the risk of obstructed labor is high. This would necessitate closer monitoring during labor, a lower threshold for considering a Cesarean section, and counseling the patient about the increased likelihood of an operative delivery.

How to Approach the Question

The question asks to identify the pelvic type 'most suited' for delivery. This requires recalling the different pelvic classifications and their obstetric significance.
Analyze the provided image, which shows the four main pelvic shapes: Gynaecoid (round), Android (heart-shaped), Anthropoid (oval in AP diameter), and Platypelloid (oval transversely).
Correlate the shapes with their suitability for childbirth. The round, spacious Gynaecoid pelvis is visibly the most accommodating for a fetal head.
Recall that the Gynaecoid pelvis is the typical 'female' pelvis and is associated with the highest rate of uncomplicated vaginal deliveries.
Eliminate the other options based on their less favorable shapes: Android (narrow outlet), Platypelloid (flat inlet), and Anthropoid (can cause malposition).

Concept Tested & Keywords

Concept Tested: Types of female pelvis and their obstetric significance
Stem keywords: pelvis, delivery, type
Lead-in keywords: most suited
Clinical cues: Image displaying the four types of pelvises (Gynaecoid, Android, Anthropoid, Platypelloid)
Negative lead-in flag: false

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E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 38-46

E6 Obstetrics Williams p. 16-32