Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 11: Which of the following is NOT a tocolytic agent?

A. Nifedipine
B. MgSO4
C. Dinoprostone (Correct Answer)
D. Terbutaline

Explanation: **Explanation:** The core concept tested here is the pharmacological management of uterine activity. **Tocolytics** are drugs used to inhibit uterine contractions to delay preterm labor, whereas **Uterotonics** are drugs used to stimulate contractions. **Why Dinoprostone is the correct answer:** **Dinoprostone (Prostaglandin E2)** is a potent **uterotonic** agent. Its primary clinical uses are for cervical ripening and the induction of labor. It acts by increasing intracellular calcium in the myometrium, leading to contractions. Therefore, it is the opposite of a tocolytic. **Analysis of Incorrect Options (Tocolytic Agents):** * **Nifedipine:** A Calcium Channel Blocker (CCB). It is currently the **first-line tocolytic** in many guidelines due to its high efficacy and favorable side-effect profile. It works by preventing calcium entry into myometrial cells. * **MgSO4 (Magnesium Sulfate):** While primarily used for neuroprotection in preterm birth and seizure prophylaxis in eclampsia, it acts as a tocolytic by competing with calcium at the motor endplate. * **Terbutaline:** A Beta-2 adrenergic agonist. It increases cAMP levels, which leads to myometrial relaxation. It is often used for "acute tocolysis" to manage uterine hyperstimulation. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of choice for Tocolysis:** Nifedipine (CCB). * **Specific Tocolytic:** Atosiban (Oxytocin receptor antagonist) is highly specific with the fewest side effects but is expensive. * **Indomethacin (NSAID):** Used as a tocolytic before 32 weeks; contraindicated after 32 weeks due to the risk of premature closure of the *ductus arteriosus*. * **Absolute Contraindication for Tocolysis:** Chorioamnionitis, lethal fetal anomaly, or severe abruption.

Question 12: What is the most common presentation of a breech presentation?

A. Right sacroanterior
B. Left sacroposterior (Correct Answer)
C. Right sacroposterior
D. Left sacroanterior

Explanation: In breech presentation, the **sacrum** is the denominator. The position is determined by the relationship of the fetal sacrum to the maternal pelvis. ### **Explanation of the Correct Answer** **B. Left Sacroposterior (LSP)** is the most common position in breech presentation. The underlying medical concept relates to the shape of the maternal pelvis and the adaptation of the fetus. In a normal gynecoid pelvis, the left oblique diameter is slightly more spacious due to the presence of the sigmoid colon on the left side of the pelvic brim. This anatomical configuration encourages the fetal sacrum to orient itself toward the **left posterior** segment of the maternal pelvis. ### **Analysis of Incorrect Options** * **D. Left Sacroanterior (LSA):** While LSA is the second most common position, it is less frequent than LSP. (Note: In cephalic presentations, the "Anterior" positions like LOA/ROA are more common, but breech follows a different mechanical preference). * **A & C. Right Sacroanterior/Posterior:** Right-sided positions are less common because the right oblique diameter of the pelvis is often more encroached upon by the bulk of the liver and the specific curvature of the lower spine, making the left side the path of least resistance for the fetal back. ### **High-Yield Clinical Pearls for NEET-PG** * **Denominator:** The Sacrum. * **Most Common Variety of Breech:** Frank breech (extended breech), especially in primigravidae. * **Incidence:** Breech occurs in approximately 3–4% of term pregnancies. * **Diagnosis:** Confirmed by Leopold’s maneuvers (hard, round head at the fundus) and Vaginal Examination (feeling the ischial tuberosities and anus). * **Management:** External Cephalic Version (ECV) is typically offered at 36 weeks in primigravidae and 37 weeks in multigravidae.

Question 13: A 30-year-old lady presented with strong labor pains for the last 3 hours and no progress, found to have pelvic deformities leading to cephalopelvic disproportion. The baby was delivered by cesarean section. The woman is likely to have suffered from the deficiency of which vitamin?

A. Vitamin D (Correct Answer)
B. Vitamin B
C. Vitamin C
D. Vitamin A

Explanation: ### Explanation **Correct Answer: A. Vitamin D** The clinical presentation of **pelvic deformities** leading to **cephalopelvic disproportion (CPD)** and obstructed labor is a classic sequela of **Vitamin D deficiency**. **Underlying Medical Concept:** Vitamin D is essential for calcium absorption and bone mineralization. Deficiency during childhood leads to **Rickets**, while in adulthood, it causes **Osteomalacia**. These conditions result in softening of the bones. Under the pressure of body weight, the pelvic bones (sacrum, ilium, and pubis) can collapse or become distorted, leading to a **contracted pelvis** (e.g., rachitic flat pelvis or triradiate pelvis). A deformed pelvis reduces the available diameters for the fetal head to pass through, resulting in CPD and necessitating a Cesarean section. **Why Incorrect Options are Wrong:** * **Vitamin B (Complex):** Deficiencies typically manifest as neurological (B12/Thiamine), dermatological (B2/B3), or hematological (B12/Folate) issues. They do not cause structural bony pelvic deformities. * **Vitamin C:** Deficiency leads to **Scurvy**, characterized by defective collagen synthesis, capillary fragility (bleeding gums), and impaired wound healing, but not gross pelvic bone distortion. * **Vitamin A:** Deficiency primarily affects vision (Night blindness, Xerophthalmia) and epithelial integrity. It does not impact bone architecture in a way that causes CPD. **High-Yield Clinical Pearls for NEET-PG:** * **Rachitic Pelvis:** Characterized by a shortened anteroposterior (AP) diameter of the inlet and an increased transverse diameter (Flat Pelvis). * **Osteomalacic Pelvis:** Also known as a **Triradiate pelvis**, where the lateral pelvic walls are pushed inwards, severely narrowing the birth canal. * **CPD Definition:** A mismatch between the fetal head size and the maternal pelvic capacity. * **Vitamin D & Pregnancy:** Maternal Vitamin D deficiency is also linked to an increased risk of pre-eclampsia and gestational diabetes.

Question 14: Which of the following interventions is NOT recommended in the active management of the third stage of labor?

A. Administration of uterotonic within 1 minute of delivery
B. Immediate clamping, cutting, and ligation of the cord (Correct Answer)
C. Gentle massage of the uterus
D. Controlled cord traction

Explanation: The **Active Management of the Third Stage of Labor (AMTSL)** is a set of interventions designed to facilitate the delivery of the placenta and prevent Postpartum Hemorrhage (PPH). ### **Why Option B is the Correct Answer** Current WHO and FIGO guidelines recommend **Delayed Cord Clamping (DCC)**, typically performed 1–3 minutes after birth (or when cord pulsations cease). Immediate clamping is **not recommended** because DCC allows for a "placental transfusion," increasing the infant's iron stores and reducing the risk of anemia and intraventricular hemorrhage in preterm infants. Therefore, immediate clamping is no longer a component of standard AMTSL. ### **Explanation of Other Options** * **Option A (Uterotonics):** This is the most critical component of AMTSL. **Oxytocin (10 IU IM/IV)** is the drug of choice, ideally administered within 1 minute of the baby's birth to stimulate uterine contractions. * **Option D (Controlled Cord Traction):** Also known as the **Brandt-Andrews maneuver**, CCT involves applying steady tension to the cord while providing counter-traction above the pubic symphysis to prevent uterine inversion. It speeds up placental delivery. * **Option C (Uterine Massage):** While the WHO no longer mandates continuous massage as a preventive measure if the uterus is contracted, it remains a standard practice to assess uterine tone immediately after placental delivery and perform massage if the uterus feels boggy. ### **NEET-PG High-Yield Pearls** * **PPH Definition:** Blood loss >500 ml (Vaginal) or >1000 ml (LSCS). * **Most Common Cause of PPH:** Uterine Atony (70-80%). * **Drug of Choice for PPH Prophylaxis:** Oxytocin. * **Contraindication for CCT:** Do not perform CCT before signs of placental separation are visible to avoid **Uterine Inversion**. * **Delayed Cord Clamping Exception:** DCC is avoided if the neonate requires immediate resuscitation or if there is maternal hemodynamic instability.

Question 15: What is the average duration of the third stage of labor?

A. 45 minutes
B. 15 minutes (Correct Answer)
C. 60 minutes
D. 5 minutes

Explanation: **Explanation:** The **third stage of labor** begins immediately after the delivery of the fetus and ends with the complete expulsion of the placenta and membranes. **Why 15 minutes is correct:** In modern obstetric practice, the average duration of the third stage is approximately **15 minutes**. While the physiological process can take longer, the widespread use of **Active Management of Third Stage of Labor (AMTSL)**—which includes the administration of uterotonics (Oxytocin), controlled cord traction (CCT), and uterine massage—has significantly reduced the average duration to this timeframe. **Analysis of Incorrect Options:** * **5 minutes (Option D):** While the placenta can occasionally separate very rapidly, 5 minutes is shorter than the average duration for most women. * **45 minutes (Option A) & 60 minutes (Option C):** These durations are considered pathologically prolonged. In clinical practice, the third stage is defined as **prolonged** if it exceeds **30 minutes** with AMTSL or **60 minutes** with expectant management. Prolonged third stage significantly increases the risk of Postpartum Hemorrhage (PPH). **NEET-PG High-Yield Pearls:** * **Definition of Retained Placenta:** If the placenta is not delivered within 30 minutes (with AMTSL), it is termed a retained placenta, necessitating manual removal. * **Signs of Placental Separation:** 1. **Schultze mechanism:** Central separation (most common, 80%). 2. **Matthews Duncan mechanism:** Peripheral separation (20%). * **Clinical Signs of Separation:** Sudden gush of blood, lengthening of the umbilical cord, and the uterus becoming firm, globular, and rising in the abdomen (Calkin’s sign). * **Drug of Choice for AMTSL:** Injection Oxytocin (10 IU IM or 5 IU slow IV).

Question 16: What is the ideal management of a 37-week uncomplicated breech pregnancy?

A. Spontaneous vaginal delivery
B. Elective cesarean section
C. External cephalic version and trial of vaginal delivery (Correct Answer)
D. None of the above

Explanation: ### Explanation **1. Why Option C is Correct:** The management of a breech presentation at term (37 weeks or beyond) focuses on reducing the risks associated with breech vaginal delivery while avoiding unnecessary surgery. **External Cephalic Version (ECV)** is the preferred initial management for an uncomplicated breech pregnancy at 37 weeks. If successful, it converts the fetus to a cephalic presentation, allowing for a **Trial of Labor After Version (TOLAV)**. ECV has a success rate of approximately 50-60% and significantly reduces the rate of Cesarean Sections (CS). **2. Why Other Options are Incorrect:** * **Option A (Spontaneous Vaginal Delivery):** While possible, a planned vaginal breech delivery is associated with higher perinatal morbidity and mortality compared to cephalic delivery or planned CS (as per the *Term Breech Trial*). It is generally reserved for specific criteria (e.g., frank breech, flexed head) or emergency situations. * **Option B (Elective Cesarean Section):** While many clinicians opt for CS for breech, it is not the "ideal" first step for an *uncomplicated* case at 37 weeks. ECV should be offered first to provide the patient the opportunity for a safer vaginal delivery. **3. Clinical Pearls for NEET-PG:** * **Timing of ECV:** Performed at **37 weeks** in nulliparous women (to allow for spontaneous version before 37 weeks and ensure fetal maturity if labor is induced by the procedure). * **Prerequisites for ECV:** Reactive NST, adequate liquor (AFI >5), and no contraindications (e.g., placenta previa, prior classical CS, or oligohydramnios). * **Tocolysis:** Beta-mimetics (like Ritodrine or Terbutaline) are often used to relax the uterus during ECV to increase success rates. * **Most common type of breech:** Frank breech (extended legs). * **Safety:** The most common complication of ECV is transient fetal bradycardia.

Question 17: What does the presence of fibronectin in a fetus indicate?

A. Post-dated pregnancy
B. Preterm labor (Correct Answer)
C. Pre-eclampsia
D. None of the above

Explanation: **Explanation:** **Fetal Fibronectin (fFN)** is a high-molecular-weight glycoprotein that acts as a "biological glue," anchoring the fetal membranes (chorioamnion) to the maternal decidua. 1. **Why Preterm Labor is Correct:** Under normal physiological conditions, fFN is present in cervicovaginal secretions before 20 weeks and again near term (after 37 weeks) as the body prepares for labor. However, its presence between **22 and 34 weeks** indicates a disruption of the choriodecidual interface. This leakage into the vagina serves as a potent biochemical marker for **Preterm Labor (PTL)**. Its clinical strength lies in its **High Negative Predictive Value (95-99%)**: if fFN is absent, there is a <1% chance the patient will deliver within the next 7–14 days. 2. **Why Other Options are Incorrect:** * **Post-dated pregnancy:** fFN is naturally present at term and post-term due to the physiological breakdown of the choriodecidual interface; it is not a diagnostic marker for post-maturity. * **Pre-eclampsia:** This is a multi-system hypertensive disorder related to placental implantation and endothelial dysfunction. It is diagnosed via blood pressure and proteinuria, not fFN. **Clinical Pearls for NEET-PG:** * **Prerequisites for fFN Test:** The test must be performed before a digital vaginal exam or transvaginal ultrasound. * **False Positives:** Recent sexual intercourse (semen), vaginal bleeding, or use of lubricants/antiseptics within the last 24 hours can cause false-positive results. * **Cut-off Value:** A concentration of **>50 ng/mL** is considered a positive result.

Question 18: Delayed labour occurs in which of the following conditions?

A. Early use of epidural anesthesia with analgesia, Early use of analgesia, Unripened cervix, Preeclampsia
B. Early use of epidural anesthesia with analgesia, Early use of analgesia, Preeclampsia, Use of sedative early in course of labour (Correct Answer)
C. Early use of epidural anesthesia with analgesia, Unripened cervix, Preeclampsia, Use of sedative early in course of labour
D. Early use of epidural anesthesia with analgesia, Early use of analgesia, Preeclampsia, Use of sedative early in course of labour

Explanation: **Explanation:** Delayed labor (protracted or arrested labor) is primarily influenced by the "3 Ps": Power (uterine contractions), Passenger (fetal factors), and Passage (pelvis). The correct option identifies factors that interfere with these components, particularly **uterine power** and **maternal effort**. 1. **Early use of Epidural/Analgesia/Sedatives:** Administering these during the latent phase or early active phase can decrease uterine contractility and diminish the maternal urge to push (Ferguson reflex). Sedatives, in particular, can lead to "therapeutic rest," which intentionally slows down labor progress. 2. **Preeclampsia:** This condition is associated with placental insufficiency and an increased risk of iatrogenic interventions. Magnesium sulfate, often used for seizure prophylaxis in preeclampsia, acts as a tocolytic (calcium antagonist), which can directly relax the myometrium and prolong labor. **Analysis of Options:** * **Option B (Correct):** Includes all four pharmacological and systemic factors (Epidural, Analgesia, Preeclampsia, Sedatives) known to inhibit uterine activity or maternal cooperation. * **Options A & C:** While an "unripened cervix" is a risk factor for a failed induction, it is generally considered a precursor to labor rather than a cause of delay *during* the established course of labor itself. * **Option D:** This is a duplicate of the correct answer but often lacks the specific combination of pharmacological inhibitors found in the standard teaching of labor dystocia. **NEET-PG High-Yield Pearls:** * **Friedman’s Curve:** Used to track labor progress. Active phase begins at **6 cm** dilation (as per recent WHO/ACOG guidelines, previously 4 cm). * **Active Phase Arrest:** No cervical change for **≥4 hours** with adequate contractions or **≥6 hours** with inadequate contractions. * **Epidural Effect:** It primarily prolongs the **second stage** of labor (by approximately 1 hour) rather than the first stage. * **Drug of Choice for Augmentation:** Oxytocin is the gold standard for correcting delayed labor due to "power" issues.

Question 19: Which of the following is NOT a feature of uterine contraction in spastic lower segment?

A. Presence of fundal dominance (Correct Answer)
B. There may be reversed polarity
C. Inadequate relaxation in between contractions
D. Basal tonus is usually raised above the critical level of 20 mm Hg

Explanation: In normal labor, uterine contractions follow the principle of **Triple Descendent Gradient**, which includes **fundal dominance** (contractions start and are strongest at the fundus), a downward propagation of the wave, and a longer duration of contraction in the upper segment. **Explanation of the Correct Answer:** **Option A (Presence of fundal dominance)** is the correct answer because fundal dominance is a feature of **normal uterine action**. In a **spastic lower segment** (a type of hypertonic uterine dysfunction), the normal gradient is lost. Instead of the fundus leading the contraction, the lower segment becomes hyperactive and fails to relax, effectively neutralizing the expulsive force of the upper segment. **Analysis of Incorrect Options:** * **Option B (Reversed polarity):** In spastic lower segment dysfunction, the "polarity" is reversed. Instead of the upper segment contracting and the lower segment dilating, the lower segment contracts more strongly than the fundus, preventing cervical dilatation. * **Option C (Inadequate relaxation):** Because the uterus is in a hypertonic state, the muscle fibers do not relax completely between contractions. This leads to fetal distress due to compromised uteroplacental circulation. * **Option D (Raised basal tonus):** Normal basal tone is 8–12 mm Hg. In spastic conditions, the resting tone (basal tonus) rises above the critical level of **20 mm Hg**, which is a hallmark of hypertonic uterine inertia. **NEET-PG High-Yield Pearls:** * **Colicky Uterus:** Characterized by irregular, localized contractions without a coordinated gradient. * **Hypertonic Uterine Inertia:** Associated with increased basal tone (>20 mmHg) and is extremely painful (out of proportion to the intensity of contractions). * **Management:** Unlike hypotonic inertia (where Oxytocin is used), hypertonic states are managed with **analgesics/sedatives (Morphine)** or Tocolytics; Oxytocin is contraindicated as it may cause uterine rupture.

Question 20: In modern-day obstetrics, what is the most common cause of uterine rupture?

A. Prolonged labor
B. Previous lower segment caesarean section scar rupture (Correct Answer)
C. Forceps delivery
D. Internal podalic version

Explanation: **Explanation:** **Uterine rupture** is a catastrophic obstetric emergency. In modern obstetrics, the epidemiology has shifted significantly due to the rising rates of surgical interventions and better management of obstructed labor. **1. Why the Correct Answer is Right:** The most common cause of uterine rupture today is the **dehiscence or rupture of a previous uterine scar**, specifically from a **Lower Segment Caesarean Section (LSCS)**. As the global rate of primary C-sections increases, more women present for a Trial of Labor After Caesarean (TOLAC). The scarred myometrium is a point of structural weakness; under the stress of uterine contractions, this scar can give way. While classical (vertical) scars have a higher risk (4–9%), the sheer volume of LSCS procedures makes the transverse lower segment scar the most frequent culprit in clinical practice (risk ~0.5–1%). **2. Why Other Options are Incorrect:** * **Prolonged/Obstructed Labor:** Historically the leading cause (due to the formation of a pathological retraction ring or Bandl’s ring), it is now less common in modern settings due to active management of labor and timely intervention. * **Forceps Delivery:** While instrumental delivery can cause cervical or vaginal tears, it rarely causes true uterine rupture unless performed inappropriately through an incompletely dilated cervix. * **Internal Podalic Version:** This is a high-risk procedure (used for the second twin) that can cause traumatic rupture, but it is performed so infrequently today that it is not the "most common" cause. **Clinical Pearls for NEET-PG:** * **Most common site:** Lower segment (in scarred uteri). * **Earliest sign:** Fetal heart rate abnormalities (typically **variable or late decelerations**/bradycardia). * **Classic clinical sign:** Recession of the presenting part and cessation of contractions. * **Scar type risk:** Classical scar > Hysterotomy scar > LSCS scar. * **Silent Rupture:** Often refers to scar dehiscence where the visceral peritoneum remains intact, and bleeding is minimal.

Practice by Chapter

Physiology of Labor

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Stages of Labor and Normal Progression

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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

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