Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 231: What is the main complication associated with multiple pregnancy?

A. Postpartum hemorrhage (PPH) (Correct Answer)
B. Twin interlocking
C. Foetus papyraceous
D. Eclampsia

Explanation: **Explanation:** **Postpartum Hemorrhage (PPH)** is the most common and significant complication associated with multiple pregnancies. The primary underlying mechanism is **uterine atony**. In multiple gestations, the uterus is severely overdistended to accommodate two or more fetuses, placentae, and increased liquor volume. This overstretching leads to poor uterine contractility after delivery, preventing effective vasoconstriction of the spiral arteries at the placental site. Additionally, the larger placental surface area in multiple pregnancies increases the risk of both atonic and traumatic PPH. **Analysis of Incorrect Options:** * **B. Twin interlocking:** This is a rare but serious mechanical complication (occurring in about 1 in 1,000 twin pregnancies), typically seen when the first twin is a breech and the second is a cephalic presentation. It is not the "main" or most frequent complication. * **C. Foetus papyraceous:** This refers to the mummification of a dead fetus in a multi-fetal pregnancy, usually occurring in the second trimester. While specific to multiple pregnancies, it is an uncommon occurrence. * **D. Eclampsia:** While the risk of Preeclampsia is significantly higher (3-4 times) in multiple pregnancies, PPH remains the most frequent complication encountered during the immediate peripartum period. **High-Yield NEET-PG Pearls:** * **Most common complication of twins:** Prematurity (Preterm labor). * **Most common cause of maternal morbidity in twins:** Postpartum Hemorrhage (PPH). * **Management Tip:** Active Management of Third Stage of Labor (AMTSL) is mandatory in multiple pregnancies, often requiring additional uterotonics (e.g., Oxytocin infusion or Carboprost) due to the high risk of atony. * **Weight Gain:** Recommended weight gain in a twin pregnancy for a woman with a normal BMI is 16.8–24.5 kg.

Question 232: A 32-week pregnant lady presents to the emergency room with continuous bleeding per vaginum. The uterus is painful and tender. What is the most likely diagnosis?

A. Circumvallate placenta
B. Rupture of membranes
C. Placenta previa
D. Abruptio placenta (Correct Answer)

Explanation: ### Explanation The clinical presentation of **continuous bleeding per vaginum** associated with a **painful and tender uterus** in the third trimester is a classic hallmark of **Abruptio Placenta**. #### Why Abruptio Placenta is Correct: Abruptio placenta refers to the premature separation of a normally situated placenta from the uterine wall. The bleeding is often associated with retroplacental clot formation, which causes uterine irritability, leading to a **"woody hard,"** tender, and painful uterus. Unlike other causes of antepartum hemorrhage (APH), the pain is constant and the bleeding is often "revealed" or "mixed." #### Why Other Options are Incorrect: * **Placenta Previa:** This typically presents as **painless, causeless, and recurrent** bright red bleeding. The uterus remains soft, non-tender, and the fetal parts are easily palpable. * **Circumvallate Placenta:** While it can cause APH and preterm labor, it is a morphological variation of the placenta and does not typically present with the acute uterine tenderness seen in abruption. * **Rupture of Membranes:** This presents as a sudden gush of clear or blood-tinged fluid (liquor), not continuous frank bleeding with uterine tenderness. #### Clinical Pearls for NEET-PG: * **Most common risk factor:** Pregnancy-induced hypertension (PIH) or Preeclampsia. * **Couvelaire Uterus:** A severe form of abruption where blood extravasates into the myometrium, giving the uterus a bluish/purplish mottled appearance. * **Coagulopathy:** Abruptio placenta is the most common cause of **Consumptive Coagulopathy (DIC)** in obstetrics. * **Diagnosis:** Primarily **clinical**. Ultrasound is unreliable for excluding abruption as it only detects about 25-50% of cases (retroplacental clots).

Question 233: Multiple pregnancy resulting from fertilization of two ova discharged from the ovary at different periods of ovulation is best termed as:

A. Superfecundation
B. Superfoetation (Correct Answer)
C. Pseudocyesis
D. Atavism

Explanation: **Explanation:** The correct answer is **Superfoetation**. **1. Understanding the Correct Answer:** **Superfoetation** refers to the fertilization and implantation of a second ovum in a uterus that already contains a developing fetus. This occurs when an ovum is released during a **different menstrual cycle** (different periods of ovulation) than the first. For this to happen, three rare events must occur: ovulation during an existing pregnancy, fertilization, and successful implantation. In humans, this is extremely rare because the high progesterone levels during pregnancy typically suppress further ovulation and the cervical mucus plug prevents sperm entry. **2. Analysis of Incorrect Options:** * **A. Superfecundation:** This is the fertilization of two ova within the **same menstrual cycle** by sperm from different acts of coitus (often by different fathers). The key difference is the timing of ovulation (same cycle vs. different cycles). * **C. Pseudocyesis:** Also known as "phantom pregnancy," this is a psychological condition where a non-pregnant woman experiences physical symptoms of pregnancy (amenorrhea, abdominal enlargement) due to an intense desire or fear of becoming pregnant. * **D. Atavism:** This is a biological phenomenon where an ancestral genetic trait reappears after having been lost through evolutionary change in previous generations (e.g., a human baby born with a vestigial tail). **3. High-Yield NEET-PG Pearls:** * **Superfecundation:** Same cycle, different coitus. * **Superfoetation:** Different cycles, different ovulation periods. * **Dizygotic Twins:** Most common type of multiple pregnancy; always dichorionic and diamniotic. * **Twin Peak Sign (Lambda sign):** Ultrasound hallmark of dichorionic diamniotic (DCDA) twins. * **T-sign:** Ultrasound hallmark of monochorionic diamniotic (MCDA) twins.

Question 234: Absolute contraindications to induction of labor include all, EXCEPT:

A. Placenta previa
B. Previous cesarean section with transverse scar (Correct Answer)
C. Myomectomy entering the endometrium
D. Uterine unification surgery

Explanation: **Explanation:** Induction of Labor (IOL) is contraindicated when the risks of vaginal delivery outweigh the benefits for the mother or fetus. The core medical concept involves distinguishing between **absolute contraindications** (where vaginal delivery is impossible or life-threatening) and **relative contraindications** (where a Trial of Labor After Cesarean, or TOLAC, is permissible). **Why Option B is the Correct Answer:** A **previous cesarean section with a low transverse incision** is a relative contraindication, not an absolute one. In modern obstetrics, TOLAC is encouraged for women with one previous lower segment cesarean section (LSCS) as the risk of uterine rupture is low (approximately 0.5–1%). Therefore, IOL can be performed cautiously in these patients using mechanical methods or oxytocin. **Analysis of Incorrect Options (Absolute Contraindications):** * **Placenta Previa (A):** Vaginal delivery is impossible as the placenta obstructs the birth canal; IOL would lead to catastrophic maternal hemorrhage. * **Myomectomy entering the endometrium (C):** If the uterine cavity was breached during surgery, the scar is considered full-thickness (similar to a classical incision), posing a high risk of uterine rupture during contractions. * **Uterine Unification Surgery (D):** Procedures like the Strassman operation for bicornuate uteri involve extensive fundal incisions, making the uterus highly susceptible to rupture during labor. **NEET-PG High-Yield Pearls:** * **Absolute Contraindications to IOL:** Classical (vertical) CS scar, previous hysterotomy, vasa previa, active genital herpes, and pelvic outlet obstruction (e.g., large fibroid). * **Safe Methods for TOLAC:** Mechanical dilators (Foley bulb) are preferred over prostaglandins (Dinoprostone/Misoprostol) in patients with a previous scar to minimize rupture risk. * **Bishop Score:** Always assess the Bishop score before IOL; a score of $\geq$ 8 suggests a high likelihood of successful vaginal delivery.

Question 235: Which of the following is NOT a result of shoulder dystocia?

A. Erb's palsy
B. Klumpke's palsy
C. Sternomastoid swelling
D. Anencephaly (Correct Answer)

Explanation: **Explanation:** **Shoulder dystocia** is an obstetric emergency where the fetal head is delivered but the anterior shoulder becomes impacted behind the maternal symphysis pubis. This requires downward traction and maneuvers that can lead to various birth injuries. **Why Anencephaly is the correct answer:** **Anencephaly** is a neural tube defect characterized by the absence of a major portion of the brain, skull, and scalp. It is a **congenital malformation** that occurs during early embryogenesis (around the 3rd to 4th week of gestation). It is not a result of the mechanical trauma or complications associated with the process of labor or shoulder dystocia. **Analysis of incorrect options:** * **Erb’s Palsy (C5-C6):** The most common injury in shoulder dystocia, caused by excessive lateral traction on the fetal neck, damaging the upper brachial plexus. It results in the "waiter's tip" deformity. * **Klumpke’s Palsy (C8-T1):** Caused by injury to the lower brachial plexus, often due to hyperabduction of the arm during difficult deliveries. It results in a "claw hand." * **Sternomastoid Swelling:** Also known as a "sternomastoid tumor" or congenital muscular torticollis, this can result from birth trauma (like shoulder dystocia) causing a hematoma within the muscle, which later fibroses. **NEET-PG High-Yield Pearls:** * **Turtle Sign:** The retraction of the fetal head against the perineum; the hallmark clinical sign of shoulder dystocia. * **First-line Management:** **McRoberts Maneuver** (hyperflexion of maternal thighs) combined with **Suprapubic pressure**. * **Zavanelli Maneuver:** Cephalic replacement (pushing the head back into the vagina) followed by emergency C-section; used as a last resort. * **Risk Factors:** Maternal obesity, gestational diabetes, and fetal macrosomia.

Question 236: When does the "bag of membranes" typically rupture during labor?

A. Before full dilatation of the cervix (Correct Answer)
B. After full dilatation of the cervix
C. After the fetal head is engaged
D. With excessive show

Explanation: In normal labor, the rupture of membranes (ROM) typically occurs during the **active phase of the first stage of labor**, usually when the cervix is well-dilated but **before it reaches full dilatation (10 cm)**. This is often referred to as Spontaneous Rupture of Membranes (SROM). ### **Why Option A is Correct** As labor progresses, the formation of the "forewaters" occurs. With increasing intensity of uterine contractions and the resulting hydrostatic pressure, the membranes (amnion and chorion) eventually lose their structural integrity. In a physiological labor pattern, this rupture happens most frequently toward the end of the first stage, prior to the transition to the second stage (full dilatation). ### **Analysis of Incorrect Options** * **Option B:** While membranes can remain intact until the second stage (rarely resulting in a "born in the caul" delivery), it is not the *typical* timing. Rupture usually precedes full dilatation. * **Option C:** Fetal head engagement often occurs before the onset of labor in primigravidae or early in labor in multigravidae. Rupture of membranes is an event related to cervical progression and pressure, not solely the station of the head. * **Option D:** "Show" (the release of the mucus plug mixed with blood) is a sign of early cervical effacement and usually precedes the rupture of membranes by hours or even days. ### **High-Yield NEET-PG Pearls** * **PROM (Premature ROM):** Rupture occurring before the onset of labor. * **PPROM (Preterm PROM):** Rupture occurring before 37 weeks of gestation. * **ARM (Artificial ROM):** Also known as amniotomy; used to augment labor or for internal fetal monitoring. * **Danger Sign:** If membranes rupture and the fetal head is not well-applied to the cervix, the risk of **Cord Prolapse** increases significantly. Always check fetal heart sounds immediately after ROM.

Question 237: Which presentation is most unfavorable for vaginal delivery?

A. Mento posterior (Correct Answer)
B. Mento anterior
C. Occipito posterior
D. Deep transverse arrest

Explanation: **Explanation:** In obstetrics, the feasibility of vaginal delivery depends on the relationship between the presenting diameter of the fetal head and the maternal pelvic dimensions. **1. Why Mento-posterior (A) is the correct answer:** In a face presentation, the fetal head is maximally extended. In the **Mento-posterior (MP)** position, the fetal chin (mentum) is directed toward the maternal sacrum. For the head to be born, it must undergo further extension; however, the head is already at its limit of extension. Furthermore, the short fetal neck cannot span the length of the maternal sacrum (approx. 12 cm) to allow the chin to escape over the perineum. This results in a **mechanical impossibility** for vaginal delivery unless the head rotates spontaneously to a mento-anterior position. Persistent MP is an absolute indication for Cesarean section. **2. Analysis of Incorrect Options:** * **Mento-anterior (B):** Vaginal delivery is possible. The chin can escape under the symphysis pubis, allowing the head to be born by flexion. * **Occipito-posterior (C):** This is a common malposition. While it may lead to prolonged labor ("sunny-side up"), most cases rotate to occipito-anterior or deliver vaginally as a persistent OP (face-to-pubes). * **Deep Transverse Arrest (D):** This occurs when the head is arrested in the transverse position at the level of the ischial spines. While it requires operative intervention (Ventouse, Forceps, or C-section), it is not as "unfavorable" as MP because it is often a transient state or correctable. **Clinical Pearls for NEET-PG:** * **Engaging diameter in Face presentation:** Submento-bregmatic (9.5 cm). * **Rule of Thumb:** "Mento-anterior can deliver, Mento-posterior cannot." * **Brow Presentation:** The most unfavorable of all presentations (Diameter: Mentovertical, 13.5 cm), but among the given options of *face* and *vertex* positions, MP is the definitive answer for mechanical obstruction.

Question 238: Artificial rupture of membranes is contraindicated in:

A. Heart disease
B. Diabetes
C. Pregnancy-induced hypertension
D. Intrauterine fetal death (Correct Answer)

Explanation: **Explanation:** **Artificial Rupture of Membranes (ARM)**, or amniotomy, is a common obstetric procedure used to induce or augment labor. However, it is strictly **contraindicated in Intrauterine Fetal Death (IUFD)**. **Why IUFD is the correct answer:** In the case of a dead fetus, the protective barrier of the amniotic sac should be maintained as long as possible. Rupturing the membranes introduces an ascending route for bacteria into the uterine cavity. Since the fetus is non-viable and necrotic tissue is present, the risk of **maternal sepsis and chorioamnionitis** increases exponentially. Furthermore, the goal in IUFD is a safe vaginal delivery without adding maternal morbidity; ARM offers no benefit here and significantly increases the risk of infection. **Why other options are incorrect:** * **Heart Disease, Diabetes, and PIH:** These are actually conditions where ARM is often **indicated**. In these high-risk pregnancies, timely delivery is frequently required to stabilize maternal health. ARM is used as a method of induction (often combined with Oxytocin) to achieve a controlled vaginal delivery, which is generally preferred over Cesarean section in these patients. **Clinical Pearls for NEET-PG:** * **Absolute Contraindications for ARM:** IUFD, transverse lie, umbilical cord prolapse (or high-floating head), and active genital herpes. * **Prerequisites for ARM:** The cervix must be dilated, the fetal head must be engaged (to prevent cord prolapse), and the presentation must be cephalic. * **Complications of ARM:** Cord prolapse (most common if the head is high), accidental fetal injury, and vasa previa rupture.

Question 239: Which of the following factors affect the duration of the latent phase of labor?

A. Early use of conduction anesthesia and sedation
B. Unripe cervix
C. Hypertonic uterine contractions
D. Pre-eclampsia (Correct Answer)

Explanation: **Explanation:** The **latent phase of labor** is the period from the onset of regular uterine contractions to the beginning of the active phase (usually 4–6 cm cervical dilation). A **prolonged latent phase** is defined as >20 hours in nullipara and >14 hours in multipara. **Why Pre-eclampsia is the correct answer:** While several factors can influence labor, **Pre-eclampsia** is a systemic vascular disorder that often necessitates medical intervention. In pre-eclamptic patients, the use of **Magnesium Sulfate (MgSO₄)** for seizure prophylaxis acts as a mild tocolytic, which can decrease uterine contractility and prolong the latent phase. Additionally, these patients often undergo **Induction of Labor (IOL)** with an unfavorable cervix, which naturally extends the time required to reach the active phase compared to spontaneous labor. **Analysis of Incorrect Options:** * **A. Early use of conduction anesthesia and sedation:** While excessive sedation can slow labor, modern conduction anesthesia (epidurals) administered in the latent phase does not significantly prolong its duration according to current ACOG guidelines. * **B. Unripe cervix:** An unripe cervix (low Bishop score) is a *prerequisite* for the start of the latent phase, not necessarily a factor that dictates its pathological prolongation in a standard physiological context, though it is a risk factor for failed induction. * **C. Hypertonic uterine contractions:** These are typically associated with **precipitate labor** (shortened duration) or placental abruption, rather than a prolonged latent phase. **NEET-PG High-Yield Pearls:** * **Friedman’s Curve:** The classic tool used to track labor progress. * **Management of Prolonged Latent Phase:** The preferred management is **therapeutic rest** (morphine) or oxytocin augmentation; Cesarean section is rarely indicated for a prolonged latent phase alone. * **Active Phase Arrest:** Defined as no cervical change for ≥4 hours with adequate contractions or ≥6 hours with inadequate contractions.

Question 240: What is the most common presentation in anencephaly?

A. Breech
B. Face (Correct Answer)
C. Brow
D. Shoulder

Explanation: **Explanation:** In **anencephaly**, there is a developmental failure of the cranial vault and brain tissue. This structural defect directly impacts the fetal attitude and presentation during labor. **Why Face Presentation is Correct:** The absence of the calvarium (skull cap) means there is no bony structure to maintain the normal flexed attitude of the head. Furthermore, the absence of the brain and the presence of a bulky base of the skull often lead to **hyperextension of the neck**. Because the vertex is missing, the face becomes the most dependent part and the leading pole in the birth canal. Therefore, **Face presentation** is the most common malpresentation associated with anencephaly. **Analysis of Incorrect Options:** * **A. Breech:** While malpresentations are generally more common in fetal anomalies due to altered fetal shape and polyhydramnios (common in anencephaly), breech is not as frequent as face presentation in these specific cases. * **C. Brow:** Brow presentation requires a partial extension of the head. In anencephaly, the lack of a forehead and cranial vault makes a true "brow" presentation anatomically impossible. * **D. Shoulder:** Transverse lie leading to shoulder presentation occurs more frequently with polyhydramnios or prematurity, but it is not the characteristic presentation for anencephaly. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Anencephaly is best diagnosed via ultrasound (showing the "Frog-eye appearance"). * **Biochemical Marker:** Elevated **Alpha-fetoprotein (AFP)** in maternal serum and amniotic fluid. * **Associated Condition:** **Polyhydramnios** is present in 50% of cases due to the failure of the fetus to swallow amniotic fluid and transudation from exposed meninges. * **Labor:** Expectant management is usually preferred as the condition is incompatible with life; however, face presentation may lead to slow progress in labor.

Practice by Chapter

Physiology of Labor

Practice Questions

Stages of Labor and Normal Progression

Practice Questions

Fetal Monitoring Techniques

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Pain Management in Labor

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Induction and Augmentation of Labor

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Operative Delivery (Forceps and Vacuum)

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Cesarean Section: Indications and Techniques

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Dystocia and Abnormal Labor Patterns

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Obstetric Emergencies

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Postpartum Hemorrhage Management

Practice Questions

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