Labor and Delivery Practice Questions

Q: For the prevention of preterm labor in a patient with a history of preterm delivery, which of the following is used?

Progesterone. **Explanation:** **1. Why Progesterone is Correct:** Progesterone is essential for maintaining "uterine quiescence." It inhibits the production of pro-inflammatory cytokines and prostaglandins, thereby preventing cervical ripening and uterine contractions. In women with a **documented history of spontaneous preterm birth (sPTB)**, progesterone supplementation (typically 17-OHP caproate or vaginal progesterone) has been shown to significantly reduce the risk of recurrence. It is the standard of care for secondary prevention of preterm labor. **2. Why Other Options are Incorrect:** * **A. Calcium supplements:** While calcium is vital for maternal bone health and may play a role in reducing the risk of pre-eclampsia, it has no proven role in preventing preterm labor. * **B. Ecosprin (Low-dose Aspirin):** This is used primarily for the prevention of **Pre-eclampsia** and Fetal Growth Restriction (FGR) in high-risk patients. It does not prevent preterm labor directly. * **C. Steroids (Corticosteroids):** These are used for **fetal lung maturity** once preterm labor is *imminent* (between 24–34 weeks). They do not prevent the onset of labor; they reduce neonatal morbidity (RDS, IVH, NEC) after the birth. **3. High-Yield Clinical Pearls for NEET-PG:** * **Screening:** In patients with a history of sPTB, **Transvaginal Ultrasound (TVS)** for cervical length (CL) is performed. If CL <25 mm before 24 weeks, it is a strong predictor of preterm birth. * **Management:** * **History of sPTB:** Progesterone is indicated. * **Short Cervix (<25mm) + History of sPTB:** Consider **Cervical Cerclage** (McDonald or Shirodkar). * **Short Cervix (<25mm) + No History:** Vaginal progesterone is the preferred treatment. * **Tocolytics:** (e.g., Nifedipine, Atosiban) are used to delay delivery for 48 hours to allow steroid action, not for long-term prevention.

Q: A pregnant woman in her 32nd week of gestation is given magnesium sulfate for pre-eclampsia. What is the earliest clinical indication of hypermagnesemia?

Loss of deep tendon reflexes. **Explanation:** Magnesium sulfate ($MgSO_4$) is the drug of choice for seizure prophylaxis in pre-eclampsia and control in eclampsia. It acts as a CNS depressant and a neuromuscular blocker by inhibiting acetylcholine release at the motor endplate. Because it is excreted solely by the kidneys, toxicity (hypermagnesemia) is a significant risk, especially in patients with renal impairment. **Why Option A is Correct:** The **loss of deep tendon reflexes (patellar reflex/knee jerk)** is the **earliest clinical sign** of magnesium toxicity. It occurs when serum magnesium levels reach **7–10 mEq/L** (Normal therapeutic range is 4–7 mEq/L). The loss of reflexes serves as a crucial "warning sign" that precedes more severe life-threatening complications. **Analysis of Incorrect Options:** * **B. Flaccid paralysis:** This occurs at higher levels (usually >10–12 mEq/L) as neuromuscular blockade intensifies, leading to generalized muscle weakness. * **C. Respiratory arrest:** This is a late and fatal sign, typically occurring when levels exceed **12–15 mEq/L** due to paralysis of the diaphragm and intercostal muscles. * **D. Hypotension:** While $MgSO_4$ causes vasodilation, hypotension is an inconsistent finding and not the primary clinical marker used to monitor for toxicity. **NEET-PG High-Yield Pearls:** * **Monitoring:** Always monitor **Respiratory Rate** (>12/min), **Urine Output** (>30 ml/hr), and **Patellar Reflex** during administration. * **Antidote:** The immediate management for toxicity is **10 ml of 10% Calcium Gluconate** IV (administered over 10 minutes). * **Cardiac Arrest:** Occurs at levels >25 mEq/L. * **Therapeutic Level:** 4.8–8.4 mg/dL (or 4–7 mEq/L).

Q: Pelvic examination is not indicated in which of the following conditions?

Placenta previa. In cases of **Placenta Previa**, the placenta is implanted in the lower uterine segment, covering or near the internal os. Performing a digital pelvic examination (PV) can inadvertently detach the placenta or traumatize the highly vascularized placental bed, leading to **sudden, torrential, and life-threatening hemorrhage**. Therefore, a PV examination is strictly contraindicated unless performed in an "Operation Theatre" under double setup (prepared for immediate Cesarean section). The gold standard for diagnosis is a Transvaginal Ultrasound (TVS), which is safe and accurate. **Explanation of Incorrect Options:** * **Contracted Pelvis:** Pelvic examination (Clinical Pelvimetry) is essential here to assess the pelvic diameters (e.g., diagonal conjugate, ischial spines) and determine the feasibility of vaginal delivery. * **Hydatidiform Mole:** While diagnosis is primarily via USG ("snowstorm appearance") and beta-hCG levels, a PV examination is not contraindicated and may reveal a "doughy" uterus or the presence of theca lutein cysts. * **Ectopic Pregnancy:** A bimanual examination is a standard clinical step to check for cervical motion tenderness (Chandelier sign) and adnexal masses, though it must be performed gently to avoid rupturing the sac. **High-Yield Clinical Pearls for NEET-PG:** * **Warning Hemorrhage:** The first episode of bleeding in placenta previa is usually painless, causeless, and recurrent. * **Rule of Thumb:** In any patient presenting with antepartum hemorrhage (APH), **always** perform a speculum examination to rule out local causes, but **never** perform a digital PV until placenta previa is ruled out by ultrasound. * **Stallworthy’s Sign:** Posterior placenta previa can interfere with the engagement of the fetal head, a classic clinical finding.

Q: What is an absolute indication for cesarean section?

Vaginal atresia. ### Explanation **Correct Answer: D. Vaginal atresia** In obstetrics, an **absolute indication** for a Cesarean Section (CS) refers to a clinical scenario where vaginal delivery is physically impossible or poses an immediate, life-threatening risk to the mother or fetus. **Vaginal atresia** (congenital absence or closure of the vagina) is an absolute indication because the birth canal is structurally non-existent or obstructed. There is no anatomical pathway for the fetus to descend, making abdominal delivery the only possible route. **Why the other options are incorrect:** * **A. Previous uterine scar:** This is a **relative indication**. Many women with one previous lower segment cesarean section (LSCS) can safely undergo a **Trial of Labor After Cesarean (TOLAC)**, leading to a Vaginal Birth After Cesarean (VBAC). * **B. Transverse lie:** While a persistent transverse lie at term requires a CS, it is not always "absolute" because external cephalic version (ECV) can sometimes be attempted to convert the fetus to a longitudinal lie, or the fetus may spontaneously convert before labor. * **C. Breech presentation:** This is a **relative indication**. Depending on the type of breech (e.g., frank breech), fetal weight, and pelvic adequacy, a planned vaginal breech delivery is an acceptable clinical option in specific cases. **High-Yield Clinical Pearls for NEET-PG:** * **Other Absolute Indications:** Central Placenta Previa (Grade IV), Cephalopelvic Disproportion (CPD), Pelvic exostosis/tumors obstructing the birth canal, and Advanced invasive Cervical Cancer. * **Most common indication for CS worldwide:** Previous CS. * **Most common indication for primary CS:** Dystocia (Failure to progress). * **Vaginal Atresia** is often associated with **Müllerian Agenesis (MRKH Syndrome)**; however, if a pregnancy occurs (via ART/surrogacy or in cases of partial atresia), the delivery must be abdominal.

Q: In a patient with a prosthetic heart valve, at which gestational age is it generally recommended to switch from warfarin to heparin?

36 weeks. **Explanation:** The management of anticoagulation in pregnant women with prosthetic heart valves is a critical balance between preventing maternal valve thrombosis and minimizing fetal/neonatal risks. **Why 36 weeks is correct:** Warfarin is a highly effective anticoagulant but crosses the placenta. The primary concern near term is the risk of **fetal intracranial hemorrhage** during the mechanical stress of labor and delivery if the fetus is anticoagulated. Therefore, it is standard practice to switch from Warfarin to **Unfractionated Heparin (UFH) or Low Molecular Weight Heparin (LMWH)** at **36 weeks** of gestation. Heparin does not cross the placenta, ensuring the fetus is not anticoagulated during birth. Additionally, UFH has a short half-life and can be easily reversed with Protamine Sulfate if urgent delivery is required. **Analysis of Incorrect Options:** * **A & B (28 and 32 weeks):** Switching this early unnecessarily increases the risk of maternal valve thrombosis. Warfarin is generally superior to heparin for preventing valve thrombosis; thus, it is continued as long as safely possible. * **D (Postpartum):** Waiting until postpartum is dangerous. If the patient goes into labor while on Warfarin, the risk of neonatal hemorrhage is extremely high. Warfarin is typically restarted 6–12 hours after an uncomplicated delivery. **Clinical Pearls for NEET-PG:** * **Warfarin Embryopathy:** Occurs if Warfarin is used between **6–12 weeks** (stippled epiphyses, nasal hypoplasia). * **Preferred Regimen:** Many guidelines suggest Warfarin throughout pregnancy (if dose <5mg) due to lower valve failure rates, but **switching at 36 weeks is mandatory** regardless of the dose. * **Labor Management:** Heparin should be discontinued 4–6 hours (UFH) or 24 hours (LMWH) before planned induction or regional anesthesia.

Q: Placenta previa is characterized by all of the following except?

Presents in first trimester. **Explanation:** Placenta previa is a condition where the placenta is implanted in the lower uterine segment, partially or completely covering the internal os. It is a classic cause of **Antepartum Hemorrhage (APH)**. **Why Option C is the correct answer:** Placenta previa typically presents in the **late second or third trimester** (usually after 28 weeks of gestation). This is because the lower uterine segment begins to form and stretch during this period, causing the placental attachments to shear and bleed. Bleeding in the first trimester is categorized as an abortion, ectopic pregnancy, or molar pregnancy, not placenta previa. **Analysis of other options:** * **Painless bleeding (Option A):** This is the hallmark of placenta previa. Unlike placental abruption, the bleeding occurs without uterine contractions or pain. * **Causeless bleeding (Option B):** The bleeding usually occurs spontaneously without any preceding trauma or obvious inciting factor. * **Recurrent bleeding (Option D):** Bleeding episodes often recur as the lower segment continues to stretch and the cervix begins to efface as term approaches. The first episode (warning hemorrhage) is usually mild. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Transvaginal Ultrasound (TVS) is the gold standard for localization. * **Contraindication:** **Digital vaginal examination** is strictly contraindicated unless the patient is in the operating theater (Double Setup Examination), as it can provoke torrential hemorrhage. * **Stallworthy’s Sign:** A clinical finding where the fetal heart rate slows when the head is pushed into the pelvis, suggesting a posterior placenta previa. * **Risk Factors:** Multiparity, advanced maternal age, and previous Cesarean section (increases risk of Placenta Accreta Spectrum).

Question 1

Which of the following correctly defines Montevideo units for measurement of uterine activity?

Accepted Answer

Uterine pressure (mm of Hg) multiplied by the number of contractions in 10 minutes.

Answer

Uterine pressure (mm of water) multiplied by the number of contractions in 10 minutes.

Answer

Uterine pressure (cm of water) multiplied by the number of contractions in 10 minutes.

Answer

Uterine pressure (cm of H2O) multiplied by the number of contractions in 20 minutes.

Question 2

For the prevention of preterm labor in a patient with a history of preterm delivery, which of the following is used?

Accepted Answer

Progesterone

Answer

Calcium supplements

Answer

Ecosprin

Answer

Steroids

Question 3

External cephalic version (ECV) is contraindicated in which of the following conditions?

Accepted Answer

Pregnancy-induced hypertension (PIH)

Answer

Primigravida

Answer

Flexed breech presentation

Answer

Severe anemia

Question 4

A pregnant woman in her 32nd week of gestation is given magnesium sulfate for pre-eclampsia. What is the earliest clinical indication of hypermagnesemia?

Accepted Answer

Loss of deep tendon reflexes

Answer

Flaccid paralysis

Answer

Respiratory arrest

Answer

Hypotension

Question 5

What is an absolute indication for caesarean section?

Accepted Answer

Type IV placenta previa

Answer

Previous lower segment caesarean section (LSCS)

Answer

Fetal distress

Answer

Breech presentation

Question 6

Pelvic examination is not indicated in which of the following conditions?

Accepted Answer

Placenta previa

Answer

Contracted pelvis

Answer

Hydatidiform mole

Answer

Ectopic pregnancy

Question 7

A pregnant mother at 32 weeks gestation presents in preterm labor. Antenatal steroids to induce lung maturity in the fetus may be given in all of the following conditions except?

Accepted Answer

Chorioamnionitis

Answer

Prolonged rupture of membranes for more than 24 hours

Answer

Pregnancy-induced hypertension

Answer

Diabetes mellitus

Question 8

What is an absolute indication for cesarean section?

Accepted Answer

Vaginal atresia

Answer

Previous uterine scar

Answer

Transverse lie

Answer

Breech presentation

Question 9

In a patient with a prosthetic heart valve, at which gestational age is it generally recommended to switch from warfarin to heparin?

Accepted Answer

36 weeks

Answer

28 weeks

Answer

32 weeks

Answer

Postpartum

Question 10

Placenta previa is characterized by all of the following except?

Accepted Answer

Presents in first trimester

Answer

Painless bleeding

Answer

Causeless bleeding

Answer

Recurrent bleeding

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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