Operative Obstetrics Practice Questions

Q: In which genetic condition is this most likely to be seen?

Trisomy 21. ***Trisomy 21*** - The **double bubble sign** (duodenal atresia) on prenatal ultrasound has a strong association with **Down syndrome**, occurring in approximately **30%** of cases. - **Trisomy 21** is the most common viable autosomal trisomy and frequently presents with gastrointestinal anomalies including **duodenal atresia**. *Trisomy 16* - **Most common trisomy** in spontaneous miscarriages but is **not compatible with life** beyond early pregnancy. - Does not typically present with duodenal atresia as affected fetuses do not survive to term. *Monosomy X* - **Turner syndrome** classically presents with **cystic hygroma**, **coarctation of aorta**, and **webbed neck** on prenatal imaging. - Gastrointestinal anomalies like duodenal atresia are **not characteristic** features of this condition. *Trisomy 13* - **Patau syndrome** typically presents with **holoprosencephaly**, **polydactyly**, and severe central nervous system malformations. - While gastrointestinal anomalies can occur, **duodenal atresia** is not a classic association with this condition.

Q: Which of the following is NOT a potential fetal injury in breech extraction?

Injury to lung. **Explanation:** Breech extraction is a high-risk obstetric procedure involving significant manual manipulation of the fetus. The correct answer is **Injury to lung**, as the lungs are protected within the rigid thoracic cage and are rarely subject to direct mechanical trauma during these maneuvers. **Why the other options are potential injuries:** * **Injury to Liver (Option A):** This is the most common solid organ injury in breech delivery. Improper handling of the fetal trunk (grasping the abdomen instead of the pelvic girdle) can lead to subcapsular hematoma or rupture. * **Intracranial Hemorrhage (Option C):** Rapid decompression of the after-coming head as it passes through the birth canal can cause tearing of the tentorium cerebelli or the vein of Galen, leading to intracranial bleeding. * **Injury to Adrenal Gland (Option D):** The fetal adrenal glands are relatively large and highly vascular. Mechanical stress and trunk compression during extraction can lead to adrenal hemorrhage. **NEET-PG High-Yield Pearls:** 1. **Most common fracture:** Clavicle (followed by the humerus and femur). 2. **Nerve Injuries:** Erb’s palsy (C5-C6) is common due to excessive lateral traction on the neck during the delivery of the after-coming head. 3. **Rule of Grasping:** Always grasp the fetus by the **fetal pelvis/iliac crests**, never the abdomen, to prevent visceral (liver/spleen/kidney) injury. 4. **Mauriceau-Smellie-Veit maneuver:** Used for the delivery of the after-coming head to maintain flexion and prevent intracranial trauma.

Q: In which of the following situations should forceps not be used for delivery?

Hydrocephalus. **Explanation:** The primary prerequisite for any instrumental vaginal delivery (Forceps or Ventouse) is a **favorable cephalopelvic relationship**. In **Hydrocephalus**, the fetal head is pathologically enlarged, leading to a significant cephalopelvic disproportion (CPD). Attempting a forceps delivery in this scenario is contraindicated because the blades cannot securely grasp the oversized head, and the forceful traction required would lead to severe maternal soft tissue trauma or uterine rupture. The management of choice for hydrocephalus is usually cephalocentesis or Cesarean section. **Analysis of Incorrect Options:** * **Twin Delivery:** Forceps are frequently used to expedite the delivery of the second twin if there is fetal distress or maternal exhaustion, provided the head is engaged. * **Postmaturity:** Post-term pregnancy itself is not a contraindication. Forceps may be indicated if postmaturity leads to a non-reassuring fetal heart rate or a prolonged second stage of labor. * **After-coming head in Breech:** This is a classic indication. **Piper’s Forceps** are specifically designed to deliver the after-coming head of a breech to maintain flexion and protect the fetal head from sudden decompression. **NEET-PG High-Yield Pearls:** * **Prerequisites for Forceps:** Remember the mnemonic **FORCEPS**: **F**etus alive, **O**penned cervix (fully dilated), **R**uptured membranes, **C**ephalic presentation (or after-coming head), **E**ngaged head, **P**elvis adequate (no CPD), and **S**hadow/Bladder empty. * **Contraindications:** Fetal bleeding disorders (e.g., hemophilia), fetal demineralizing bone diseases (e.g., Osteogenesis Imperfecta), unengaged head, and incomplete cervical dilation. * **Piper’s Forceps:** Unique because they have a long shank with a perineal curve to allow application to the after-coming head without compressing the trunk.

Q: All the following are criteria for outlet forceps application EXCEPT?

Station is between 0 and +2 cm. This question tests your knowledge of the **ACOG classification of forceps delivery**, a high-yield topic for NEET-PG. ### **Explanation of the Correct Answer** **Option C** is the correct answer because it describes **Low Forceps**, not Outlet Forceps. According to ACOG criteria, for an **Outlet Forceps** application, the fetal station must be **on the pelvic floor (+3 cm or lower)**. A station between 0 and +2 cm (but not on the pelvic floor) is classified as **Mid-forceps** (if the head is engaged but station is <+2 cm) or **Low Forceps** (if the station is ≥+2 cm but not on the pelvic floor). ### **Analysis of Incorrect Options** * **Option A:** For outlet forceps, the fetal skull must have reached the pelvic floor. This ensures the head is low enough for a safe, low-traction delivery. * **Option B:** The scalp must be visible at the introitus without the need to separate the labia. This indicates the head is crowning or near-crowning. * **Option C:** The sagittal suture must be in the anteroposterior diameter, or in the right or left occiput anterior/posterior positions. The rotation required to reach the midline must **not exceed 45 degrees**. ### **Clinical Pearls for NEET-PG** * **Prerequisites for Forceps (FORCEPS Mnemonic):** **F**etus alive, **O**pthalmic/Pelvis adequate, **R**uptured membranes, **C**ervix fully dilated, **E**ngaged head, **P**osition known, **S**tation known/Bladder empty. * **High Forceps:** Historically used when the head is not engaged. It is **contraindicated** in modern obstetrics. * **Most common indication:** Prolonged second stage of labor. * **Key Distinction:** If rotation is **>45 degrees** and station is **≥+2 cm**, it is classified as **Low Forceps with rotation**, not Outlet Forceps.

Q: What procedure should be performed in case of arrest of the aftercoming head due to a contracted pelvis in a breech presentation?

Zavanelli maneuver. **Explanation:** The **Zavanelli maneuver** is the correct intervention for an entrapped aftercoming head in a breech delivery when conventional maneuvers (like the Mauriceau-Smellie-Veit) fail due to a contracted pelvis or cephalopelvic disproportion. It involves manually flexing the fetal head, rotating it back to an occiput-anterior position, and cephalic replacement into the uterus, followed by an emergency Cesarean section. While more commonly associated with shoulder dystocia, it is the definitive "rescue" procedure for breech entrapment to prevent fetal hypoxia and birth trauma. **Analysis of Incorrect Options:** * **Craniotomy (A):** This is a destructive procedure used to reduce the size of the fetal head. It is only indicated in cases of a **dead fetus** or severe hydrocephalus where vaginal delivery is otherwise impossible. * **Decapitation (B):** This is a destructive procedure used for an **impacted transverse lie** with a dead fetus. It is not indicated for breech presentation. * **Cleidotomy (D):** This involves the intentional fracture of the fetal clavicle to reduce the bisacromial diameter. It is used in **shoulder dystocia**, not for the entrapment of the aftercoming head. **High-Yield Clinical Pearls for NEET-PG:** * **First-line for aftercoming head:** Mauriceau-Smellie-Veit maneuver. * **Forceps for breech:** Piper’s forceps are specifically designed for the aftercoming head. * **Prerequisite for Zavanelli:** Tocolysis (e.g., Nitroglycerin or Terbutaline) is often required to relax the uterus before attempting replacement. * **Burn-Marshall Maneuver:** Used when the fetus is hanging by its own weight to facilitate delivery of the head.

Q: External cephalic version is contraindicated in all of the following conditions except:

Breech presentation. **Explanation:** External Cephalic Version (ECV) is a procedure where a clinician manually rotates a fetus from a non-vertex presentation (breech or transverse) to a vertex presentation through the maternal abdominal wall to facilitate a vaginal delivery. **Why "Breech Presentation" is the correct answer:** Breech presentation is the primary **indication** for performing an ECV, not a contraindication. The goal of the procedure is specifically to convert a breech fetus into a cephalic one to avoid the risks associated with a vaginal breech birth or a Cesarean section. **Analysis of Contraindications (Incorrect Options):** * **Antepartum Haemorrhage (APH):** This is an absolute contraindication. Manipulating the fetus can cause further placental separation (abruption), leading to life-threatening maternal or fetal hemorrhage. * **Multiple Pregnancy:** ECV is contraindicated in twins because there is insufficient space to turn the fetus, and there is a high risk of cord entanglement or premature rupture of membranes. * **Contracted Pelvis:** If the maternal pelvis is too small to allow a vertex delivery, converting the fetus to cephalic serves no clinical purpose, as a Cesarean section will be required regardless of presentation. **NEET-PG High-Yield Pearls:** * **Ideal Timing:** ECV is typically performed at **36 weeks** in primigravidae and **37 weeks** in multigravidae (to allow for spontaneous version and ensure fetal maturity if emergency delivery is needed). * **Prerequisites:** Reactive NST, adequate liquor (AFI >5), and no uterine anomalies. * **Most Common Complication:** Transient fetal bradycardia. * **Tocolysis:** Often used (e.g., Beta-mimetics) to relax the uterus and increase the success rate. * **Rh-Negative Mothers:** Must receive **Anti-D immunoglobulin** after the procedure due to the risk of feto-maternal hemorrhage.

Q: What is a chignon?

Artificial caput. **Explanation:** A **chignon** is the temporary, localized swelling of the scalp tissue caused by the application of a **vacuum extractor (ventouse)** during assisted vaginal delivery. **Why the correct answer is right:** When the vacuum cup is applied to the fetal scalp and negative pressure is exerted, it causes the underlying scalp tissue to be sucked into the cup. This leads to localized edema and extravasation of fluid, creating an **artificial caput succedaneum**. This "chignon" helps the cup maintain a firm grip on the fetal head to facilitate traction. It typically resolves spontaneously within 24 to 48 hours. **Why the incorrect options are wrong:** * **Cephalhematoma:** This is a collection of blood *under* the periosteum. Unlike a chignon, it is limited by suture lines and usually appears several hours after birth. * **Scalp laceration:** While a potential complication of vacuum or forceps delivery, a chignon is a physiological response to suction, not a cut or tear in the skin. * **Excessive molding:** Molding refers to the alteration of the fetal cranial shape due to the overlapping of skull bones during labor. While vacuum delivery can occur alongside molding, the chignon specifically refers to the soft tissue swelling. **High-Yield Facts for NEET-PG:** * **Placement:** The vacuum cup should be placed over the **flexion point** (3 cm anterior to the posterior fontanelle, along the sagittal suture). * **Pressure:** The recommended suction pressure is **0.6 to 0.8 kg/cm²**. * **Safety Rule:** The "Rule of 3s"—discontinue if there are 3 "pop-offs," 3 pulls with no descent, or the procedure exceeds 30 minutes. * **Contraindication:** Vacuum is contraindicated in **preterm fetuses (<34 weeks)** due to the high risk of subgaleal or intraventricular hemorrhage.

Question 1

During a cesarean section, how is the lower uterine segment physically identified?

Accepted Answer

Loose attachment of visceral peritoneum

Answer

Presence of dilated venous sinuses

Answer

Deflection of the uterine artery towards the upper segment

Answer

Thinness of its wall compared to the upper segment

Question 2

In which genetic condition is this most likely to be seen?

Accepted Answer

Trisomy 21

Answer

Trisomy 16

Answer

Monosomy X

Answer

Trisomy 13

Question 3

Which of the following is NOT a potential fetal injury in breech extraction?

Accepted Answer

Injury to lung

Answer

Injury to liver

Answer

Intracranial hemorrhage

Answer

Injury to adrenal gland

Question 4

In which of the following situations should forceps not be used for delivery?

Accepted Answer

Hydrocephalus

Answer

Twin delivery

Answer

Postmaturity

Answer

After the head has delivered in a breech presentation

Question 5

Why is a transverse uterine incision preferred over a vertical incision during surgery?

Accepted Answer

It reduces the risk of uterine rupture in subsequent pregnancies.

Answer

It has a lower risk of postpartum endometritis.

Answer

It facilitates easier fetal delivery.

Answer

It is located in the active segment of the uterus.

Question 6

All the following are criteria for outlet forceps application EXCEPT?

Accepted Answer

Station is between 0 and +2 cm

Answer

Fetal skull has reached the pelvic floor

Answer

Scalp is visible at the introitus without separating the labia

Answer

Rotation does not exceed 45 degrees

Question 7

What procedure should be performed in case of arrest of the aftercoming head due to a contracted pelvis in a breech presentation?

Accepted Answer

Zavanelli maneuver

Answer

Craniotomy

Answer

Decapitation

Answer

Cleidotomy

Question 8

External cephalic version is contraindicated in all of the following conditions except:

Accepted Answer

Breech presentation

Answer

Antepartum haemorrhage

Answer

Multiple pregnancy

Answer

Contracted pelvis

Question 9

What is a chignon?

Accepted Answer

Artificial caput

Answer

Cephalhematoma

Answer

Scalp laceration

Answer

Excessive molding

Question 10

Which is the commonest indication for a classical cesarean section?

Accepted Answer

Dense adhesions in the lower uterine segment

Answer

Transverse lie

Answer

Cord prolapse

Answer

Placenta previa

Operative Obstetrics — MCQs

Operative Obstetrics — MCQs

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