Labor and Delivery Practice Questions

Q: The following is true of Naegele's pelvis:

Absence of one ala. **Explanation:** **Naegele’s pelvis** is an obliquely contracted pelvis caused by the **congenital absence or rudimentary development of one ala of the sacrum**. This leads to the synostosis (fusion) of the sacroiliac joint on the affected side. Because the weight of the body is transmitted through only one functional sacroiliac joint, the pelvis becomes asymmetrical and tilted, resulting in an oblique inlet that can cause mechanical dystocia. **Analysis of Options:** * **A. Absence of one ala (Correct):** This is the hallmark of Naegele’s pelvis. It results in a unilateral deformity. * **B. Both alae absent:** This describes a **Robert’s pelvis**, which is a transversely contracted pelvis where both sacral alae are absent or rudimentary, leading to bilateral sacroiliac synostosis. * **C. Kyphotic spine:** A kyphotic spine leads to a **Kyphotic pelvis** (Funnel-shaped pelvis), characterized by a wide inlet but a severely contracted outlet (decreased interspinous and intertuberous diameters). * **D. Triradiate pelvis:** This is characteristic of **Osteomalacic pelvis**. Softening of the bones causes the acetabula to be pushed inward by the femoral heads and the sacrum to be pushed forward, giving the pelvic inlet a "clover-leaf" or triradiate appearance. **High-Yield Clinical Pearls for NEET-PG:** * **Naegele’s Pelvis:** Unilateral ala absence → Oblique contraction. * **Robert’s Pelvis:** Bilateral alae absence → Transverse contraction. * **Rachitic Pelvis:** Associated with Vitamin D deficiency; characterized by a "reniform" (kidney-shaped) inlet and an increased outlet. * **Diagnosis:** In Naegele's pelvis, the **oblique diameters** are unequal. On clinical examination, the distance from the posterior superior iliac spine of one side to the opposite anterior superior iliac spine will differ.

Q: Which of the following is NOT an advantage of median episiotomy over mediolateral episiotomy?

Extension of the incision is easy. **Explanation:** In obstetric practice, choosing between a median (midline) and mediolateral episiotomy involves balancing ease of repair against the risk of maternal trauma. **Why Option C is the correct answer:** The primary disadvantage of a **median episiotomy** is its limited anatomical space. If the fetal head is large or the delivery is instrumental, the incision is prone to **accidental extension** into the anal sphincter (3rd-degree tear) or rectal mucosa (4th-degree tear). Therefore, "easy extension" is actually a **disadvantage/risk**, not an advantage. In contrast, a mediolateral episiotomy is specifically designed to provide more room by extending away from the anus. **Analysis of Incorrect Options (Advantages of Median Episiotomy):** * **A. Less blood loss:** Since the incision is made along the relatively avascular fibrous midline (perineal body), there is significantly less bleeding compared to the mediolateral approach, which cuts through vascular muscle. * **B. Easy repair:** The anatomical planes are symmetrical and easy to approximate, leading to superior cosmetic results and less postoperative pain. * **D. Muscles are not cut:** A median incision separates the fibers of the perineal body rather than transecting the bulbospongiosus or superficial transverse perineal muscles, which are typically cut in a mediolateral episiotomy. **Clinical Pearls for NEET-PG:** * **Most common type in India:** Mediolateral (to prevent 3rd/4th-degree tears). * **Timing:** Performed at "crowning" when 3–4 cm of the head is visible. * **Angle:** Mediolateral incisions are made at a **60-degree angle** from the midline to avoid the anal sphincter. * **Dyspareunia:** More common and persistent with mediolateral episiotomy due to scarring of the pelvic floor muscles.

Q: Cesarean section is mandatory in which of the following presentations?

Brow. **Explanation:** The correct answer is **Brow presentation**. In this presentation, the fetal head is midway between full flexion and full extension. The engaging diameter is the **mentovertical diameter**, which measures approximately **13.5 cm**. Since this diameter exceeds the average dimensions of the maternal pelvic inlet (the largest being the transverse diameter at 13 cm), a persistent brow presentation is physically impossible to deliver vaginally. Therefore, a Cesarean section is mandatory unless the presentation spontaneously converts to a vertex or face presentation. **Analysis of Incorrect Options:** * **A & B (Cephalic/Vertex):** These are the most common and favorable presentations for vaginal delivery. In vertex presentation, the head is well-flexed, presenting the **suboccipitobregmatic diameter (9.5 cm)**, which easily negotiates the birth canal. * **C (Face):** Vaginal delivery is possible in face presentation provided the position is **Mentum Anterior**. In this case, the submentobregmatic diameter (9.5 cm) engages. However, if the position is **Mentum Posterior**, vaginal delivery is impossible, and a Cesarean section is required. Since face presentation *can* be delivered vaginally, it is not "mandatory" for all cases. **High-Yield Clinical Pearls for NEET-PG:** * **Largest Engaging Diameter:** Mentovertical (13.5 cm) – seen in Brow presentation. * **Smallest Engaging Diameter:** Suboccipitobregmatic (9.5 cm) – seen in well-flexed Vertex. * **Mnemonic for Face Presentation:** "Posterior is prohibited" (Mentum posterior cannot deliver vaginally). * **Brow Presentation Management:** If diagnosed early in labor, one may wait for spontaneous conversion. If it persists in active labor, **Cesarean section is the only safe mode of delivery.**

Q: A 25-year-old G1P1 woman with a history of a previous vaginal breech delivery of a term, live baby presents with a full-term pregnancy and breech presentation. What is the best management option?

Assisted breech delivery. **Explanation:** The correct management for this patient is **Assisted Breech Delivery**. The clinical cornerstone here is the patient’s obstetric history: she is a **multigravida with a previous successful vaginal breech delivery** of a term, live baby. This indicates an "adequately tested pelvis" and a proven ability to deliver a breech fetus vaginally. In such cases, if the current pregnancy is also a term breech with no other contraindications (like footling presentation or hyperextension of the head), vaginal delivery is a safe and preferred option. **Why other options are incorrect:** * **Cesarean Section:** While the Term Breech Trial (2000) increased the rates of elective CS for breech, current guidelines (ACOG/RCOG) support vaginal delivery in carefully selected cases, especially in multiparous women with a proven pelvis. * **External Cephalic Version (ECV):** ECV is typically performed between 36–37 weeks to reduce the incidence of breech at term. Since the patient is already at "full-term" and likely in labor or ready for delivery, the window for a safe ECV has passed. * **Watchful Expectancy:** This is inappropriate as breech delivery requires active monitoring and skilled assistance during the second stage of labor to prevent complications like cord prolapse or head entrapment. **High-Yield Clinical Pearls for NEET-PG:** * **Prerequisites for Vaginal Breech:** Average fetal weight (2.5–3.5 kg), Frank or Complete breech presentation, flexed fetal head, and an adequate maternal pelvis. * **Burn-Marshall Maneuver:** Used for delivery of the after-coming head (allowing the baby to hang to use gravity). * **Mauriceau-Smellie-Veit Maneuver:** The most common manual method for delivering the after-coming head. * **Piper Forceps:** The specialized forceps used specifically for the after-coming head in breech.

Q: During uterine contraction of labour, what happens to the uterine blood flow?

Decreases. **Explanation:** The correct answer is **A. Decreases**. **Underlying Medical Concept:** During a uterine contraction, the intramyometrial pressure rises significantly. This pressure compresses the intramural vessels (arcuate and radial arteries) as they pass through the interlacing muscle fibers of the myometrium (often called the "living ligatures" of the uterus). As the intrauterine pressure exceeds the venous pressure and eventually approaches the arterial pressure, the blood flow to the intervillous space is significantly reduced. This is a physiological intermittent reduction in perfusion that a healthy fetus can tolerate due to the placental reserve. **Analysis of Incorrect Options:** * **B. Increases:** This is incorrect because the mechanical compression of blood vessels by the contracting myometrium physically restricts flow rather than enhancing it. * **C. Does not change:** This is incorrect as uterine hemodynamics are highly dynamic during labor; flow fluctuates in inverse proportion to the intensity of the contraction. * **D. Temporarily ceases:** This is generally incorrect for a normal physiological contraction. While blood flow is significantly *diminished*, it rarely ceases entirely unless the contraction is pathologically tetanic or hypertonic (e.g., in placental abruption or oxytocin overstimulation). **High-Yield Clinical Pearls for NEET-PG:** * **Placental Reserve:** A healthy fetus relies on the oxygen stored in the intervillous space during the peak of a contraction. * **Fetal Heart Rate (FHR):** If the uterine blood flow is compromised excessively (e.g., tachysystole), it leads to fetal hypoxia, manifesting as **late decelerations** on cardiotocography (CTG). * **Supine Hypotension Syndrome:** In the supine position, the gravid uterus compresses the IVC, further reducing venous return and subsequently decreasing uterine blood flow, which is why the **left lateral position** is preferred during labor.

Q: Induction of labor by amniotomy can lead to which of the following complications?

Cord prolapse. **Explanation:** **Amniotomy**, or Artificial Rupture of Membranes (ARM), is a common method for the induction or augmentation of labor. **Why Cord Prolapse is the Correct Answer:** The most immediate and serious mechanical complication of amniotomy is **umbilical cord prolapse**. When the membranes are ruptured, the sudden gush of amniotic fluid can wash the cord down into the vagina, especially if the fetal presenting part is not well-engaged in the pelvis (high station) or if there is malpresentation. To minimize this risk, amniotomy should ideally be performed only when the cervix is favorable and the fetal head is well-applied to the cervix. **Analysis of Incorrect Options:** * **B. Abruptio Placenta:** While sudden decompression of the uterus (e.g., in polyhydramnios) can theoretically cause placental separation, it is a much rarer complication compared to cord prolapse during routine induction. * **C. Rupture Uterus:** This is typically a complication of obstructed labor or the overzealous use of uterotonic drugs (like Oxytocin), rather than the mechanical act of amniotomy itself. * **D. Infection:** While prolonged rupture of membranes increases the risk of **Chorioamnionitis**, it is a delayed complication. Cord prolapse is the immediate, life-threatening risk associated with the procedure itself. **High-Yield Clinical Pearls for NEET-PG:** * **Prerequisite:** Always check the fetal heart rate (FHR) before and immediately after amniotomy to rule out cord compression/prolapse. * **Contraindication:** Amniotomy should be avoided if the presenting part is high and mobile (ballotable). * **Other complications:** These include vasa previa rupture (if fetal vessels cross the membranes) and fetal scalp trauma. * **Amniotomy + Oxytocin:** This combination is more effective for induction of labor than either method used alone.

Question 1

The following is true of Naegele's pelvis:

Accepted Answer

Absence of one ala

Answer

Both alae absent

Answer

Kyphotic spine

Answer

Triradiate pelvis

Question 2

Which of the following is NOT an advantage of median episiotomy over mediolateral episiotomy?

Accepted Answer

Extension of the incision is easy

Answer

Less blood loss

Answer

Easy repair

Answer

Muscles are not cut

Question 3

All of the following are indications for early clamping of the umbilical cord except?

Accepted Answer

Postdated pregnancy

Answer

Preterm delivery

Answer

Bih's asphyxia

Answer

Maternal diabetes

Question 4

Cesarean section is mandatory in which of the following presentations?

Accepted Answer

Brow

Answer

Cephalic

Answer

Vertex

Answer

Face

Question 5

Which of the following obstetric conditions can be detected using a Partogram?

Accepted Answer

Obstructed labour

Answer

Abruptio placentae

Answer

Incoordinate uterine action

Answer

Postpartum hemorrhage (PPH)

Question 6

A 25-year-old G1P1 woman with a history of a previous vaginal breech delivery of a term, live baby presents with a full-term pregnancy and breech presentation. What is the best management option?

Accepted Answer

Assisted breech delivery

Answer

Cesarean section

Answer

External cephalic version

Answer

Watchful expectancy

Question 7

A 34-week pregnant female presents with uterine contractions and no other risk factors. What is the next immediate step in management?

Accepted Answer

Expectant management

Answer

Tocolysis for 3 more weeks

Answer

Administer dexamethasone

Answer

Vacuum-assisted delivery

Question 8

During uterine contraction of labour, what happens to the uterine blood flow?

Accepted Answer

Decreases

Answer

Increases

Answer

Does not change

Answer

Temporarily ceases

Question 9

Induction of labor by amniotomy can lead to which of the following complications?

Accepted Answer

Cord prolapse

Answer

Abruptio placenta

Answer

Rupture uterus

Answer

Infection

Question 10

Which of the following statements is NOT true regarding a "show"?

Accepted Answer

It is blood of maternal origin.

Answer

It may be a cause of antepartum hemorrhage.

Answer

It is blood of fetal origin.

Answer

It is positive on a Singer's test.

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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