Operative Obstetrics — MCQs

Operative Obstetrics Indian Medical PG Practice Questions and MCQs

Question 81: In the recovery room, 1 hour after an outlet forceps delivery, a patient is found to have an 8 x 5 cm expanding, bluish and tense, painful right labia majora. What is the most appropriate management for this patient?

A. Vaginal packing
B. Vaginal exploration under general anesthesia (Correct Answer)
C. Exploratory laparotomy and internal iliac artery ligation
D. Observation and cold compress

Explanation: ### Explanation The clinical presentation of an expanding, tense, bluish, and painful swelling in the labia majora following an instrumental delivery is diagnostic of a **Vulvar Hematoma**. **1. Why Option B is Correct:** A hematoma that is **expanding** or larger than **5 cm** requires immediate surgical intervention. The management involves: * **Incision and Evacuation:** Opening the hematoma to remove clots. * **Hemostasis:** Identifying and ligating the bleeding vessel (often a branch of the pudendal artery). * **General Anesthesia:** This is essential because the area is extremely painful, and adequate exploration is required to ensure no deeper extensions (like paravaginal involvement) are missed. **2. Why Other Options are Incorrect:** * **Option A (Vaginal packing):** This is used for diffuse capillary oozing or to provide counter-pressure *after* surgical evacuation, but it cannot stop an arterial bleed in an expanding vulvar hematoma. * **Option C (Laparotomy/Iliac ligation):** This is an extreme measure reserved for massive, uncontrollable retroperitoneal hematomas or life-threatening postpartum hemorrhage (PPH) that doesn't respond to conservative surgical measures. * **Option D (Observation and cold compress):** This is only appropriate for **small (<5 cm), stable, non-expanding** hematomas. In this case, the hematoma is large (8x5 cm) and expanding. **3. Clinical Pearls for NEET-PG:** * **Most common site:** Vulvar hematomas are most common, but **Paravaginal hematomas** are more dangerous as they can hide large volumes of blood. * **Risk Factors:** Instrumental delivery (forceps > vacuum), episiotomy, and primiparity. * **Classic Sign:** Severe, disproportionate perineal pain in the immediate postpartum period. * **Management Rule:** Small/Stable = Conservative (Ice packs); Large/Expanding/Hemodynamically unstable = Surgical evacuation.

Question 82: What is the percentage of scar dehiscence in lower uterine segment caesarean section?

A. 0.1-2% (Correct Answer)
B. 2-5%
C. 5-9%
D. More than 10%

Explanation: **Explanation:** The correct answer is **A (0.1–2%)**. In obstetric practice, it is crucial to differentiate between **scar dehiscence** (incomplete separation of the old scar with intact overlying visceral peritoneum/serosa) and **scar rupture** (complete separation of all layers including the serosa). For a **Lower Uterine Segment Caesarean Section (LSCS)**, the incidence of scar dehiscence or rupture during a subsequent trial of labor after cesarean (TOLAC) is low, typically ranging from **0.2% to 1.5%** (standardized in exams as 0.1–2%). This low risk is due to the relatively avascular and fibrous nature of the lower segment, which heals more efficiently than the muscular upper segment. **Analysis of Incorrect Options:** * **Option B (2–5%):** This range is too high for a standard transverse LSCS scar. However, the risk of rupture for a **Classical (vertical) incision** is significantly higher, approximately **4–9%**. * **Options C & D:** These percentages are excessively high for uterine scars. Such high rates are not supported by clinical data for any standard uterine incision and would make TOLAC an unacceptably dangerous practice. **High-Yield Clinical Pearls for NEET-PG:** * **Risk by Incision Type:** Classical Scar (4–9%) > T-shaped/Inverted T (4–9%) > Low Vertical (1–7%) > LSCS (0.1–2%). * **Most Common Sign:** The earliest and most common sign of uterine rupture is **fetal heart rate abnormalities** (typically prolonged bradycardia or variable decelerations), not abdominal pain. * **Scar Thickness:** A lower uterine segment thickness of **<2.0 to 2.5 mm** on ultrasound is often used as a predictor for increased risk of rupture. * **Contraindication:** A history of a classical or T-shaped incision is an absolute contraindication for TOLAC.

Question 83: Ideally, traction during vacuum extraction should be applied in which of the following manner?

A. Continuously
B. Intermittently with cycles of 20 seconds of traction followed by 1 minute of rest
C. Intermittently and with contractions (Correct Answer)
D. Intermittently and between contractions

Explanation: **Explanation:** The primary goal of vacuum-assisted vaginal delivery (VAVD) is to augment the maternal expulsive efforts. The correct technique is to apply traction **intermittently and with contractions** (Option C). **Why Option C is correct:** Traction must be synchronized with maternal pushing during a uterine contraction. This utilizes the combined force of the vacuum, the uterine muscle, and the maternal abdominal muscles. Applying traction only during contractions minimizes the total force required, reduces the duration of pressure on the fetal scalp, and allows the fetal head to recede slightly between contractions, which helps prevent excessive scalp trauma (e.g., cephalohematoma or subgaleal hemorrhage). **Analysis of Incorrect Options:** * **Option A (Continuously):** Continuous traction increases the risk of fetal scalp injury and intracranial hemorrhage. It prevents the periodic relief of pressure between contractions. * **Option B (Fixed cycles):** Traction should be guided by the physiological rhythm of the mother's labor, not a fixed timer. * **Option D (Between contractions):** Applying traction without the aid of a contraction is ineffective and dangerous, as it requires significantly more force to move the fetus, increasing the risk of "pop-offs" and maternal soft tissue trauma. **High-Yield Clinical Pearls for NEET-PG:** * **Direction of Traction:** Traction should be applied perpendicular to the plane of the vacuum cup and along the axis of the birth canal (following the Curve of Carus). * **The "Rule of Threes":** Vacuum extraction should be abandoned if there are **3** "pop-offs," **3** sets of pulls with no descent, or if the procedure exceeds **20-30** minutes. * **Prerequisite:** The cervix must be fully dilated, the membranes ruptured, and the head engaged. * **Preferred Cup:** The **Malmström cup** (metal) is traditional, but soft Silastic cups are associated with fewer neonatal scalp injuries.

Question 84: Which of the following statements regarding epilepsy in pregnancy is true?

A. Sodium valproate is the drug of choice.
B. Therapeutic drug monitoring is not required.
C. Folic acid supplementation helps prevent the risk of neural tube defects. (Correct Answer)
D. Lamotrigine is the most teratogenic antiepileptic drug.

Explanation: **Explanation:** The management of epilepsy during pregnancy requires a delicate balance between seizure control and minimizing teratogenic risks. **Why Option C is Correct:** Antiepileptic drugs (AEDs), particularly enzyme-inducers, interfere with folate metabolism. This increases the risk of **Neural Tube Defects (NTDs)** like spina bifida. High-dose **Folic Acid (5 mg/day)** is recommended starting at least one month preconception and continuing through the first trimester to mitigate this risk. While it may not eliminate the risk associated with high-dose valproate, it is a standard of care for all pregnant women on AEDs. **Analysis of Incorrect Options:** * **Option A:** **Sodium Valproate** is generally **avoided** in pregnancy. It is associated with the highest risk of major congenital malformations (Fetal Valproate Syndrome) and impaired neurodevelopmental outcomes. * **Option B:** **Therapeutic Drug Monitoring (TDM)** is often **required**. Physiological changes in pregnancy (increased volume of distribution, increased renal clearance, and altered hepatic metabolism) can significantly lower serum drug levels, increasing seizure risk. * **Option D:** **Lamotrigine** is actually considered one of the **safest** AEDs in pregnancy regarding structural malformations. Sodium Valproate remains the most teratogenic. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Levetiracetam or Lamotrigine are preferred due to lower teratogenic potential. * **Vitamin K:** To prevent Hemorrhagic Disease of the Newborn, 10 mg of Vitamin K is often given to the mother in the last month of pregnancy if she is on enzyme-inducing AEDs (e.g., Phenytoin, Carbamazepine). * **Seizure Control:** The goal is monotherapy at the lowest effective dose. Breastfeeding is generally encouraged as the benefits outweigh the small amount of drug excreted in milk.

Question 85: What is NOT performed during the third stage of labor as part of the 'Active Management of Third Stage' protocol?

A. Oxytocin injection
B. Gentle massage of the uterus
C. Controlled cord traction
D. Ergometrine injection (Correct Answer)

Explanation: The **Active Management of Third Stage of Labor (AMTSL)** is a standardized protocol designed to prevent Postpartum Hemorrhage (PPH). According to the latest WHO and FIGO guidelines, the components of AMTSL have evolved. ### Why Ergometrine injection is the correct answer: While Ergometrine is a potent uterotonic, it is **not** the drug of choice for routine AMTSL. It is contraindicated in patients with hypertension or heart disease due to its side effect of peripheral vasoconstriction. **Oxytocin (10 IU IM/IV)** is the gold standard and the preferred uterotonic for AMTSL because it is effective within 2–3 minutes, has minimal side effects, and can be used in all patients regardless of blood pressure. ### Explanation of incorrect options: * **A. Oxytocin injection:** This is the **first and most important step** of AMTSL. It should be administered within one minute of the delivery of the baby (after ruling out a second twin). * **B. Gentle massage of the uterus:** While the WHO now lists "sustained uterine massage" as optional (to be done only if the uterus is soft), periodic **palpation** of the uterus to ensure it remains contracted is a standard part of immediate postpartum care. * **C. Controlled cord traction (CCT):** Also known as the **Brandt-Andrews maneuver**, this is performed to facilitate the delivery of the placenta once the uterus has contracted, reducing the duration of the third stage. ### NEET-PG High-Yield Pearls: * **Components of AMTSL:** 1. Uterotonic (Oxytocin), 2. Controlled Cord Traction (CCT), 3. Uterine Massage/Palpation. * **Delayed Cord Clamping:** Current guidelines recommend waiting **1–3 minutes** before clamping the cord to improve neonatal iron stores; this is now integrated into the third-stage management. * **Ergometrine Contraindications:** Always remember the "5 H's": Hypertension, Heart disease, Hypersensitivity, HIV (on Protease Inhibitors), and History of Raynaud’s.

Question 86: During delivery, an episiotomy is performed. The tear extends through the rectal sphincter, but the rectal mucosa remains intact. How would you classify this type of episiotomy?

A. First-degree
B. Second-degree
C. Third-degree (Correct Answer)
D. Fourth-degree

Explanation: **Explanation:** The classification of perineal tears (and episiotomy extensions) is based on the anatomical structures involved. This question describes a tear involving the **anal sphincter complex** while sparing the underlying mucosa, which is the hallmark of a **Third-degree perineal tear**. **Breakdown of the Classification:** * **Third-degree (Correct):** This involves injury to the perineum that extends through the perineal muscles and involves the **External Anal Sphincter (EAS)** and/or the **Internal Anal Sphincter (IAS)**. Since the rectal mucosa is specifically mentioned as **intact**, it remains a third-degree injury. * **First-degree (Incorrect):** This is limited to the fourchette, perineal skin, and vaginal mucous membrane. It does not involve the underlying fascia or muscles. * **Second-degree (Incorrect):** This extends beyond the skin into the fascia and muscles of the **perineal body** (e.g., bulbocavernosus, transverse perineal muscles) but does *not* involve the anal sphincter. * **Fourth-degree (Incorrect):** This is the most severe form, where the injury extends through the anal sphincter complex (EAS and IAS) and involves the **anal epithelium/rectal mucosa**, creating a communication between the vagina and the rectum. **NEET-PG High-Yield Pearls:** 1. **Sultan’s Classification:** Third-degree tears are further sub-divided: * **3a:** <50% of EAS thickness torn. * **3b:** >50% of EAS thickness torn. * **3c:** Both EAS and IAS are torn. 2. **Timing:** Episiotomy is ideally performed during the crowning of the head (second stage of labor). 3. **Repair:** Third and fourth-degree tears must be repaired in an operating theater by an experienced obstetrician to prevent long-term complications like fecal incontinence or rectovaginal fistulas. 4. **Suture Material:** Polyglactin (Vicryl) is commonly used for muscle and mucosal repair.

Question 87: All are consistent with the diabetogenic effects of pregnancy except?

A. Insulin resistance
B. Decrease lipolysis (Correct Answer)
C. Changes in gluconeogenesis
D. Placental insulinase

Explanation: Pregnancy is characterized by a state of **"accelerated starvation"** and **"facilitated anabolism"** to ensure a continuous supply of nutrients to the fetus. The diabetogenic effect is primarily driven by placental hormones (hPL, cortisol, progesterone) to spare glucose for the fetus. **Explanation of the Correct Answer:** * **B. Decrease lipolysis:** This is the correct answer because pregnancy actually causes **increased lipolysis**. During fasting states, the maternal body shifts toward fat metabolism to conserve glucose for the fetus. This leads to an increase in free fatty acids (FFAs) and ketones in the maternal circulation. Decreased lipolysis would be contrary to the metabolic demands of pregnancy. **Analysis of Incorrect Options:** * **A. Insulin resistance:** This is a hallmark of the second and third trimesters. Human Placental Lactogen (hPL) and TNF-alpha induce peripheral resistance to insulin, ensuring glucose remains available in the blood for placental transfer. * **C. Changes in gluconeogenesis:** Maternal hepatic glucose production increases (gluconeogenesis) to maintain a steady glucose gradient for the fetus, despite the mother’s peripheral insulin resistance. * **D. Placental insulinase:** The placenta produces the enzyme insulinase, which actively degrades maternal insulin, further contributing to the diabetogenic state. **NEET-PG High-Yield Pearls:** * **hPL (Human Placental Lactogen)** is the most potent antagonist to insulin during pregnancy. * **Fasting Hypoglycemia:** Despite insulin resistance, pregnant women develop fasting hypoglycemia because the fetus continuously drains maternal glucose. * **Post-prandial Hyperglycemia:** Due to insulin resistance, blood sugar levels stay elevated longer after meals. * **Ketosis:** Pregnant women are more prone to ketosis (starvation ketosis) due to the rapid shift to lipolysis.

Question 88: Prostaglandin analogues are used in which of the following obstetric indications?

A. Induction of labor
B. Induction of abortion
C. Management of postpartum hemorrhage
D. All of the above (Correct Answer)

Explanation: Prostaglandins (PGs) are potent stimulators of smooth muscle contraction and play a pivotal role in reproductive physiology. In obstetrics, their primary utility stems from two actions: **cervical ripening** (remodeling of connective tissue) and **myometrial contraction**. ### Explanation of Options: * **Induction of Labor (A):** Prostaglandin E2 (Dinoprostone) is the gold standard for cervical ripening in patients with an unfavorable Bishop score. PGE1 (Misoprostol) is also used frequently for labor induction due to its efficacy and low cost. * **Induction of Abortion (B):** Prostaglandins are essential for both medical and surgical abortions. In medical termination of pregnancy (MTP), Misoprostol (PGE1) is used following Mifepristone to expel the products of conception. It is also used for mid-trimester pregnancy terminations. * **Management of Postpartum Hemorrhage (C):** Prostaglandins act as powerful uterotonics. Misoprostol (PGE1) and Carboprost (PGF2α) are used to treat atonic PPH by causing sustained uterine contractions to compress bleeding vessels. ### High-Yield Clinical Pearls for NEET-PG: 1. **PGE1 (Misoprostol):** Stable at room temperature; used for induction, abortion, and PPH (dose for PPH is 800 mcg sublingually/rectally). 2. **PGE2 (Dinoprostone):** Available as intracervical gel or vaginal inserts; must be stored in a refrigerator (2-8°C). 3. **PGF2α (Carboprost/15-methyl PGF2α):** Administered intramuscularly for refractory PPH. **Contraindication:** Absolute contraindication in patients with **Asthma** (causes bronchoconstriction). 4. **Side Effects:** Common side effects include nausea, vomiting, diarrhea, and transient pyrexia (fever).

Question 89: Bishop's scoring is used for assessment of:

A. Intrapartum fetal surveillance
B. Induction of labor readiness (Correct Answer)
C. Fetal weight estimation by ultrasound
D. Monitoring events during active labor

Explanation: **Explanation:** **Bishop’s Scoring** is a pre-induction cervical scoring system used to predict the likelihood of a successful vaginal delivery following the **induction of labor**. It assesses the "readiness" or "ripeness" of the cervix. A high score indicates a favorable cervix, suggesting a higher probability of successful induction, while a low score suggests an unfavorable cervix that may require ripening agents (like Prostaglandins). The score evaluates five parameters: 1. **Cervical Dilation** 2. **Cervical Effacement** 3. **Cervical Consistency** 4. **Cervical Position** 5. **Station of the Fetal Head** **Why other options are incorrect:** * **Option A:** Intrapartum fetal surveillance is primarily performed using Cardiotocography (CTG) or intermittent auscultation to monitor fetal heart rate patterns. * **Option C:** Fetal weight estimation is done via Hadlock’s formula using ultrasound parameters (BPD, HC, AC, FL) or clinically via Leopold’s maneuvers and Johnson’s formula. * **Option D:** Monitoring events during active labor is the function of a **Partogram**, which tracks cervical dilation against time, fetal descent, and maternal/fetal vitals. **High-Yield Clinical Pearls for NEET-PG:** * **Maximum Score:** 13; **Minimum Score:** 0. * **Favorable Cervix:** A score of **≥8** suggests the likelihood of vaginal delivery is similar to spontaneous labor. * **Unfavorable Cervix:** A score of **≤6** indicates cervical ripening (e.g., Dinoprostone) is needed before induction. * **Mnemonic for Parameters:** **"D-E-S-C-P"** (Dilation, Effacement, Station, Consistency, Position).

Question 90: In classical cesarean section, which part of the uterus has a higher chance of rupture?

A. Upper uterine segment (Correct Answer)
B. Lower uterine segment
C. Uterocervical junction
D. Posterior uterine segment

Explanation: **Explanation:** In a **Classical Cesarean Section**, a vertical incision is made in the **upper uterine segment**, involving the thick, muscular body of the uterus (the corpus). This area is highly vascular and undergoes significant hypertrophy and stretching during pregnancy. **Why the Upper Uterine Segment is at higher risk:** 1. **Poor Healing:** The thick myometrium in the upper segment does not appose or heal as efficiently as the thin, fibrous lower segment. 2. **Contractile Nature:** The upper segment is the active, contractile part of the uterus. During subsequent pregnancies and labor, this area is subjected to intense mechanical stress and intrauterine pressure, leading to a high risk of **rupture (up to 4-9%)**. 3. **Rupture Timing:** Unlike lower segment scars, a classical scar can rupture **before the onset of labor** or even in the late second trimester. **Analysis of Incorrect Options:** * **B. Lower Uterine Segment:** This is the site for a Lower Segment Cesarean Section (LSCS). It is thinner, less vascular, and heals with a stronger scar. The risk of rupture is significantly lower (~0.5–1%). * **C. Uterocervical Junction:** This area is generally avoided in standard incisions to prevent extension into the cervix or bladder. * **D. Posterior Uterine Segment:** Incisions are made anteriorly for accessibility. A posterior incision is rare and only used in specific malpresentations or dense adhesions. **NEET-PG High-Yield Pearls:** * **Indications for Classical CS:** Structural abnormalities (e.g., bicornuate uterus), impacted transverse lie, anterior placenta previa with engorged vessels, or extremely premature fetus in a non-developed lower segment. * **Management:** A history of classical CS is an absolute indication for **repeat elective CS at 36-37 weeks**; a Trial of Labor After Cesarean (TOLAC) is strictly contraindicated. * **Rupture Type:** Rupture of a classical scar is often catastrophic and complete, whereas LSCS scars often present as "silent" dehisences.

Practice by Chapter

Cesarean Section Techniques

Practice Questions

Vaginal Birth After Cesarean

Practice Questions

Instrumental Deliveries

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Breech Delivery

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Episiotomy and Repair

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Management of Multiple Gestation

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Cervical Cerclage

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Obstetric Hysterectomy

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Surgery During Pregnancy

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Surgical Complications in Obstetrics

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