Maternal-Fetal Medicine Practice Questions

Q: Magnesium sulfate has no role in the prevention of which of the following?

Respiratory distress syndrome in a premature baby. **Explanation:** Magnesium sulfate ($MgSO_4$) is the drug of choice in obstetric practice for seizure prophylaxis and neuroprotection, but it does not have a direct role in fetal lung maturation. 1. **Why Option B is Correct:** Respiratory Distress Syndrome (RDS) is prevented by the administration of **antenatal corticosteroids** (such as Betamethasone or Dexamethasone), which stimulate surfactant production. $MgSO_4$ does not affect surfactant synthesis and therefore has no role in preventing RDS. 2. **Why Options A & C are Incorrect:** $MgSO_4$ is the gold standard for both the **prevention** of seizures in women with severe pre-eclampsia (prophylaxis) and the **control/prevention of recurrence** in eclampsia (treatment). It acts by increasing the seizure threshold and causing cerebral vasodilation. 3. **Why Option D is Incorrect:** $MgSO_4$ is administered for **fetal neuroprotection** in anticipated preterm births (usually <32 weeks). It reduces the risk of cerebral palsy and severe motor dysfunction in the neonate by stabilizing neuronal membranes and reducing oxidative stress. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** $MgSO_4$ is an NMDA receptor antagonist and a calcium channel blocker. * **Therapeutic Range:** 4–7 mEq/L. * **Toxicity Signs:** Loss of patellar reflex (earliest sign, 8–10 mEq/L) → Respiratory depression (12–15 mEq/L) → Cardiac arrest (>25 mEq/L). * **Antidote:** 10 ml of 10% **Calcium Gluconate** IV (administered slowly). * **Excretion:** Exclusively via kidneys; hence, dose adjustment is mandatory in renal failure.

Q: What is the fetal anomaly characterized by the absence of the cranium?

Anencephaly. ### Explanation **Correct Answer: C. Anencephaly** **Anencephaly** is the most common lethal neural tube defect (NTD). It results from the failure of the **cephalic (rostral) end of the neural tube** to close between the 23rd and 26th day of conception. This failure leads to the absence of the cranial vault (acrania) and the cerebral hemispheres. The exposed brain tissue undergoes degeneration, leaving behind a vascular mass called the *area cerebrovasculosa*. On ultrasound, this presents as the characteristic **"Frog-eye appearance"** due to prominent orbits and the absence of the calvarium. **Analysis of Incorrect Options:** * **A. Cephalocele:** This is a protrusion of the cranial contents through a defect in the skull (usually occipital). Unlike anencephaly, the rest of the cranium is present. * **B. Holoprosencephaly:** This is a failure of the prosencephalon (forebrain) to divide into two cerebral hemispheres. While it involves brain malformation and facial defects (like cyclopia), the skull vault is typically present. * **C. Dandy-Walker Malformation:** This involves the posterior fossa, characterized by agenesis of the cerebellar vermis, cystic dilation of the fourth ventricle, and an enlarged posterior fossa. The cranium itself is intact. **NEET-PG High-Yield Pearls:** * **Screening:** Elevated **Maternal Serum Alpha-Fetoprotein (MSAFP)** is a classic marker for open NTDs like anencephaly. * **Prevention:** Periconceptional intake of **Folic Acid (400 mcg/day)** reduces the risk by 70%. For women with a previous affected pregnancy, the dose is increased to **4 mg/day**. * **Associated Finding:** **Polyhydramnios** is frequently seen in the third trimester because the fetus lacks the swallowing reflex due to neurological impairment.

Q: When the death of one fetus in a multiple pregnancy occurs early in pregnancy, how may it manifest?

Vanishing twin. ### Explanation The correct answer is **B. Vanishing twin**. **1. Why "Vanishing Twin" is correct:** When a fetus dies **early in pregnancy** (typically during the first trimester), the gestational sac and fetal tissues are often completely reabsorbed by the mother or the surviving twin. On a follow-up ultrasound, the previously documented twin simply "disappears," leaving a single viable fetus. This phenomenon occurs in approximately 20–30% of pregnancies conceived via assisted reproductive techniques. **2. Why the other options are incorrect:** * **A. Fetus papyraceus:** This occurs when fetal death happens in the **second trimester** (usually after 14 weeks). The fetus is too large to be fully reabsorbed; instead, the amniotic fluid is absorbed, and the dead fetus becomes flattened, mummified, and parchment-like due to mechanical compression by the growing survivor. * **C. Fetus compressus:** This is a similar stage to fetus papyraceus. It refers to a fetus that has died and been compressed, but the term "papyraceus" is more specifically used when it is flattened to a paper-thin state. * **D. Fetus acardiacus (TRAP Sequence):** This is a rare complication of monochorionic twinning where one twin has a rudimentary or absent heart and is perfused by the "pump twin" through large artery-to-artery anastomoses. It is a developmental malformation, not a manifestation of early fetal death/reabsorption. **3. Clinical Pearls for NEET-PG:** * **Timing is Key:** Early 1st Trimester = Vanishing Twin; 2nd Trimester = Fetus Papyraceus. * **Prognosis:** If a twin "vanishes" in the 1st trimester, the prognosis for the surviving twin is usually excellent. * **Monochorionic Risk:** Death of a twin in the **2nd or 3rd trimester** in a monochorionic pregnancy carries a high risk of neurological damage (periventricular leukomalacia) or death for the survivor due to acute hemodynamic shifts.

Q: Which of the following is true about magnesium sulfate (MgSO4)?

Magnesium sulfate is used in the management of eclampsia.. **Explanation:** **Magnesium Sulfate (MgSO₄)** is the drug of choice for both the prophylaxis and treatment of seizures in eclampsia (Pritchard or Zuspan regimens). It acts primarily by blocking NMDA receptors, increasing the seizure threshold, and causing cerebral vasodilation. **Analysis of Options:** * **Option B (Correct):** MgSO₄ is the gold standard for managing eclamptic seizures and preventing progression from pre-eclampsia to eclampsia. * **Option A (Incorrect):** While not the *first-line* choice today (calcium channel blockers are preferred), MgSO₄ **is** a tocolytic. It acts as a calcium antagonist, relaxing uterine smooth muscle to delay preterm labor. * **Option C (Incorrect):** MgSO₄ crosses the placenta. In cases of maternal toxicity or prolonged high-dose infusion, it can cause **neonatal respiratory depression**, hypotonia ("floppy infant syndrome"), and suppressed reflexes. * **Option D (Incorrect):** MgSO₄ is **strictly contraindicated in Myasthenia Gravis**. It inhibits the release of acetylcholine at the neuromuscular junction, which can precipitate a life-threatening myasthenic crisis. **High-Yield Clinical Pearls for NEET-PG:** 1. **Therapeutic Range:** 4–7 mEq/L. 2. **Monitoring:** Always check for **Patellar reflex** (first to disappear at 8–10 mEq/L), **Respiratory rate** (>12/min), and **Urine output** (>30 ml/hr, as it is renally excreted). 3. **Antidote:** 10 ml of 10% **Calcium Gluconate** IV (administered slowly). 4. **Neuroprotection:** MgSO₄ is also used for fetal neuroprotection in imminent preterm births <32 weeks to reduce the risk of cerebral palsy.

Q: Which of the following tumors are unique to pregnancy?

Luteoma. **Explanation:** **Luteoma of Pregnancy** (Pregnancy Luteoma) is a non-neoplastic, tumor-like ovarian lesion that is **unique to pregnancy**. It is not a true neoplasm but rather a hyperplastic reaction of ovarian stromal cells to Human Chorionic Gonadotropin (hCG). These lesions are typically asymptomatic, solid, often bilateral, and multinodular. They characteristically regress spontaneously during the postpartum period as hCG levels fall. **Why the other options are incorrect:** * **Serous and Mucinous Cystadenomas:** These are true epithelial ovarian neoplasms. While they can be found during pregnancy, they are not *unique* to it; they occur frequently in non-pregnant women across various age groups. * **Teratoma:** This is a germ cell tumor. Mature cystic teratomas (Dermoid cysts) are the most common ovarian tumors diagnosed during pregnancy, but they originate from germ cells and exist independently of the gestational state. **High-Yield Clinical Pearls for NEET-PG:** * **Virilization:** Luteomas are hormonally active. Maternal virilization occurs in about 25% of cases, and there is a high risk (up to 60-70%) of virilization in female fetuses. * **Management:** Since they are benign and regress spontaneously, the management is **conservative observation**. Surgery is only indicated to rule out malignancy or if complications like torsion occur. * **Differential Diagnosis:** Must be distinguished from **Hyperreactio Luteinalis** (multiple theca lutein cysts), which is also pregnancy-related but presents as cystic enlargement rather than solid nodules.

Q: Grade 2 abruptio placenta is characterized by?

Fetal distress. **Explanation:** Abruptio placentae is the premature separation of a normally situated placenta. To standardize clinical management, the **Sher and Linthicum classification** is used to grade the severity based on clinical findings. **Why Fetal Distress is the Correct Answer:** In **Grade 2 (Moderate) Abruption**, the separation involves approximately 1/4th to 2/3rd of the placental surface. This significant loss of surface area leads to uteroplacental insufficiency. The classic presentation includes uterine tenderness, increased uterine tone, and most characteristically, **evidence of fetal distress** (abnormal heart rate patterns or fetal tachycardia). While the mother may show signs of tachycardia or orthostatic hypotension, she is not yet in profound shock. **Analysis of Incorrect Options:** * **A & B (Pronounced shock & Severe bleeding):** These are hallmarks of **Grade 3 (Severe) Abruption**. In Grade 2, bleeding is mild to moderate, and maternal hemodynamics are usually maintained despite compensated tachycardia. * **C (Coagulation defect):** Consumptive coagulopathy (DIC) is a severe complication typically reserved for **Grade 3** cases, often associated with intrauterine fetal death (IUFD). **NEET-PG High-Yield Pearls:** * **Grade 0:** Asymptomatic; diagnosed retrospectively by finding a retroplacental clot after delivery. * **Grade 1:** Mild; no fetal distress, no maternal shock. * **Grade 3:** Severe; characterized by **maternal shock, fetal death (IUFD), and often DIC.** * **Couvelaire Uterus:** A complication where blood extravasates into the myometrium (port-wine appearance); it is a clinical diagnosis made during laparotomy. * **Most common risk factor:** Maternal hypertension (Chronic or PIH).

Q: Funneling in cervicogram is seen in which of the following conditions?

Cervical incompetence. **Explanation:** **Cervical incompetence** (now often termed cervical insufficiency) is the correct answer. It is characterized by the painless dilation and effacement of the cervix, typically during the second trimester, leading to recurrent pregnancy loss or preterm birth. **Funneling** refers to the protrusion of the amniotic membranes into the internal os as it begins to open, while the external os remains closed. On ultrasound (cervicogram), this creates a characteristic "V" or "U" shaped appearance. **Analysis of Options:** * **A. During labor:** While the cervix dilates and effaces during labor, this is a physiological process driven by uterine contractions. The term "funneling" specifically describes the pre-labor pathological changes seen in an incompetent cervix. * **C. Cervical ectopic pregnancy:** This condition involves the implantation of the blastocyst within the cervical canal. It typically presents with a "hourglass" shaped uterus and a closed internal os, rather than the progressive funneling of membranes. * **D. During TVS:** Transvaginal sonography is the **modality** used to diagnose funneling, not a condition itself. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** TVS is the gold standard. A cervical length **<25 mm** before 24 weeks is a significant risk factor. * **The "Trust" Rule:** The sequence of cervical changes in funneling follows the mnemonic **T-Y-U-V** (T = normal, Y = early funneling, U = advanced funneling, V = imminent loss). * **Management:** The primary treatment is **Cervical Cerclage** (e.g., McDonald or Shirodkar techniques), usually performed between 12–14 weeks of gestation. * **Clinical Sign:** On physical exam, "bulging membranes" or "hourglass membranes" may be visible at the external os.

Q: What is the best test to diagnose lung maturity in a neonate born to a diabetic mother?

Phosphatidylglycerol. **Explanation:** The assessment of fetal lung maturity (FLM) in diabetic pregnancies requires specific markers because maternal hyperglycemia can lead to delayed surfactant production, even if the fetus is at term. **1. Why Phosphatidylglycerol (PG) is the correct answer:** Phosphatidylglycerol is the "final marker" of lung maturation. It typically appears in amniotic fluid around 35–36 weeks of gestation. In diabetic mothers, high levels of fetal insulin (hyperinsulinism) can inhibit the enzymes responsible for surfactant synthesis. This can lead to **Respiratory Distress Syndrome (RDS)** even with a "mature" L/S ratio. However, the presence of **Phosphatidylglycerol** is not affected by insulin levels. Therefore, its presence is the most reliable indicator that the lungs are mature and the risk of RDS is near zero, making it the gold standard for diabetic pregnancies. **2. Why other options are incorrect:** * **Lecithin/Sphingomyelin (L/S) ratio:** While an L/S ratio > 2.0 generally indicates maturity in normal pregnancies, it is notoriously **unreliable in diabetic mothers**. These fetuses can develop RDS despite an L/S ratio > 2.0 (false maturity). * **Ultrasonography:** While USG can estimate gestational age and detect certain markers (like placental grading or distal femoral epiphysis), it cannot biochemically confirm functional lung maturity. **High-Yield Clinical Pearls for NEET-PG:** * **Hyperinsulinemia** is the primary culprit; it antagonizes the action of cortisol on type II pneumocytes. * **L/S Ratio:** Measured via amniocentesis. 2.0 is mature; 1.5–1.9 is intermediate; 30,000–50,000/µL suggests maturity.

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).

Question 1

Magnesium sulfate has no role in the prevention of which of the following?

Accepted Answer

Respiratory distress syndrome in a premature baby

Answer

Seizures in severe pre-eclampsia

Answer

Recurrent seizures in eclampsia

Answer

Neuroprotection

Question 2

What is the fetal anomaly characterized by the absence of the cranium?

Accepted Answer

Anencephaly

Answer

Cephalocele

Answer

Holoprosencephaly

Answer

Dandy-Walker Malformation

Question 3

When the death of one fetus in a multiple pregnancy occurs early in pregnancy, how may it manifest?

Accepted Answer

Vanishing twin

Answer

Fetus papyraceus

Answer

Fetus compressus

Answer

Fetus acardiacus

Question 4

Which of the following is true about magnesium sulfate (MgSO4)?

Accepted Answer

Magnesium sulfate is used in the management of eclampsia.

Answer

Magnesium sulfate is not a tocolytic.

Answer

Magnesium sulfate does not cause neonatal respiratory depression.

Answer

Magnesium sulfate can be given in myasthenia gravis.

Question 5

Which of the following tumors are unique to pregnancy?

Accepted Answer

Luteoma

Answer

Serous cystadenoma

Answer

Mucinous cystadenoma

Answer

Teratoma

Question 6

Grade 2 abruptio placenta is characterized by?

Accepted Answer

Fetal distress

Answer

Pronounced shock

Answer

Severe bleeding

Answer

Coagulation defect

Question 7

Funneling in cervicogram is seen in which of the following conditions?

Accepted Answer

Cervical incompetence

Answer

During labor

Answer

Cervical ectopic pregnancy

Answer

During transvaginal sonography (TVS)

Question 8

What is the best test to diagnose lung maturity in a neonate born to a diabetic mother?

Accepted Answer

Phosphatidylglycerol

Answer

Sphingomyelin/Lecithin ratio

Answer

Ultrasonography

Answer

None of the above

Question 9

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 10

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

Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine — MCQs

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