Maternal-Fetal Medicine Practice Questions

Q: Amniotic fluid alpha-fetoprotein levels are typically elevated in which of the following conditions?

Open neural tube defect. ### Explanation **Correct Answer: B. Open neural tube defect** **Mechanism:** Alpha-fetoprotein (AFP) is a glycoprotein synthesized by the fetal yolk sac and later by the fetal liver. In a healthy pregnancy, AFP is excreted into the fetal urine and subsequently into the amniotic fluid in controlled amounts. In cases of **Open Neural Tube Defects (ONTDs)**, such as anencephaly or open spina bifida, there is a lack of skin coverage over the neural tissue. This allows AFP to leak directly from the fetal serum and cerebrospinal fluid into the amniotic fluid, leading to significantly elevated levels. **Analysis of Options:** * **A. Traumatic amniocentesis:** While fetal blood contamination during amniocentesis can theoretically raise AFP levels (as fetal serum AFP is much higher than amniotic fluid levels), it is considered a **false positive** or an artifact of the procedure rather than a clinical "condition" where levels are typically elevated. * **C. Intrauterine fetal death (IUFD):** In IUFD, the fetal skin becomes macerated and permeable, which can lead to a rise in amniotic fluid AFP. However, the question asks for the condition where it is *typically* used as a diagnostic marker. ONTD is the classic, high-yield association for elevated AFP in maternal-fetal medicine exams. **High-Yield Clinical Pearls for NEET-PG:** * **Amniotic Acetylcholinesterase (AChE):** This is the most specific confirmatory test for an open NTD if the amniotic AFP is elevated. * **Low AFP Levels:** Associated with **Down Syndrome (Trisomy 21)**, Trisomy 18, and maternal obesity. * **Other causes of High AFP:** Omphalocele, Gastroschisis (ventral wall defects), Multiple gestations, and Renal anomalies (Finnish-type nephrosis). * **Screening Window:** Maternal Serum AFP (MSAFP) is typically screened between **15–20 weeks** of gestation.

Q: What is the most effective and safe drug to control eclampsia?

Magnesium sulfate. **Explanation:** **Magnesium Sulfate (MgSO₄)** is the drug of choice for both the prevention (prophylaxis) and treatment of seizures in eclampsia. It is superior to traditional anticonvulsants because it acts centrally by increasing the seizure threshold (via NMDA receptor antagonism) and peripherally by blocking neuromuscular transmission. Large-scale clinical trials, such as the **Collaborative Eclampsia Trial**, confirmed that MgSO₄ reduces the risk of recurrent seizures and maternal death more effectively than other agents. **Analysis of Incorrect Options:** * **Phenytoin (Option A):** While an effective anti-epileptic, it is less effective than MgSO₄ in preventing recurrent eclamptic seizures and is associated with a higher rate of maternal and neonatal complications. * **Diazepam (Option C):** Benzodiazepines can control acute seizures but are associated with a high risk of recurrence, maternal respiratory depression, and neonatal "Floppy Infant Syndrome." They are now only used if MgSO₄ is contraindicated or unavailable. **NEET-PG High-Yield Pearls:** * **Regimens:** The **Pritchard Regimen** (IM) and **Zuspan Regimen** (IV) are the standard protocols. * **Therapeutic Range:** 4–7 mEq/L. * **Toxicity Monitoring:** Always check for the presence of the **Patellar reflex** (first sign to disappear), Respiratory rate (>12/min), and Urine output (>30 ml/hr). * **Antidote:** **Calcium Gluconate** (10 ml of 10% solution given IV over 10 minutes). * **Mechanism:** It is also a potent vasodilator, which helps reduce cerebral vasospasm.

Q: A 150 cm tall pregnant woman with a hemoglobin of 11 gm%, blood pressure of 160/110 mm Hg, and a 12 kg weight gain during pregnancy delivered an intrauterine growth restriction (IUGR) baby. What are the causes of IUGR in this case?

Hypertension. **Explanation:** The primary cause of Intrauterine Growth Restriction (IUGR) in this patient is **Hypertension**. **1. Why Hypertension is the Correct Answer:** In this case, the patient presents with a blood pressure of 160/110 mm Hg, which signifies severe hypertension (likely Preeclampsia or Chronic Hypertension). Hypertension is the most common maternal cause of IUGR. The underlying pathophysiology involves **defective trophoblastic invasion** of the spiral arteries, leading to high-resistance blood flow and **uteroplacental insufficiency**. This reduces the supply of oxygen and nutrients to the fetus, resulting in asymmetric IUGR. **2. Analysis of Incorrect Options:** * **Maternal Infection (A):** While infections like TORCH can cause IUGR (typically symmetric), there is no clinical evidence (fever, rash, or lymphadenopathy) provided in the history to suggest this. * **Short Maternal Stature (B):** A height of 150 cm is generally considered the cutoff for "short stature" in some populations, but it usually correlates with a small-for-gestational-age (SGA) baby (constitutionally small) rather than pathological IUGR. * **Excessive Weight Gain (D):** The patient gained 12 kg, which is within the normal recommended range (11–16 kg). Poor maternal weight gain (malnutrition) is a risk factor for IUGR, not excessive gain. **Clinical Pearls for NEET-PG:** * **Most common cause of IUGR:** Maternal vascular disease (Hypertension). * **Asymmetric IUGR:** Most common type (80%); caused by placental insufficiency; "Head sparing" effect seen on USG. * **Symmetric IUGR:** Caused by early insults like chromosomal anomalies or early intrauterine infections. * **Ponderal Index:** Used to differentiate between symmetric and asymmetric IUGR (decreased in asymmetric).

Q: A 37-week pregnant lady presents with a BP of 150/100 mmHg and 3+ proteinuria. On pelvic examination, the cervix is soft with 50% effacement, station is '-2', the pelvis is adequate, and the cervical os is 1 cm dilated. What is the most appropriate next step?

Induction of labor. ### Explanation **1. Why Induction of Labor is Correct:** The patient presents with **Preeclampsia with severe features** (BP ≥140/90 mmHg with 3+ proteinuria) at **37 weeks gestation**. In cases of preeclampsia, the definitive treatment is delivery once the fetus reaches term (≥37 weeks). Since the pelvis is adequate and there are no contraindications to vaginal delivery (like fetal distress or malpresentation), **Induction of Labor (IOL)** is the management of choice. Even with a low Bishop score (implied by -2 station and 1 cm dilation), cervical ripening agents can be used to initiate labor. **2. Why Other Options are Incorrect:** * **A & B (Observation/Await Spontaneous Labor):** Expectant management is contraindicated at 37 weeks in preeclampsia. Delaying delivery increases the risk of maternal complications (eclampsia, HELLP syndrome, placental abruption) without providing further fetal benefit. * **D (Cesarean Section):** Preeclampsia itself is not an indication for a C-section. A trial of vaginal labor is preferred unless there are obstetric indications (e.g., cephalopelvic disproportion, fetal distress, or failed induction). **3. Clinical Pearls for NEET-PG:** * **Term Preeclampsia:** Always deliver at ≥37 weeks, regardless of severity. * **Pre-term Preeclampsia:** If <34 weeks and stable, manage expectantly with steroids; if ≥34 weeks with severe features, proceed to delivery. * **Magnesium Sulfate ($MgSO_4$):** Should be administered during labor for seizure prophylaxis in severe preeclampsia. * **Antihypertensives:** Indicated only if BP is ≥160/110 mmHg (Severe Hypertension) to prevent maternal stroke. Common choices: Labetalol, Hydralazine, or Nifedipine.

Q: After an initial pregnancy resulting in a spontaneous loss in the first trimester, a patient is concerned about the possibility of this recurring. What is the approximate chance of recurrence?

Is no different than it was prior to the miscarriage. ### Explanation **Correct Answer: B. Is no different than it was prior to the miscarriage** **Medical Concept:** Spontaneous abortion (miscarriage) is the most common complication of early pregnancy, occurring in approximately 10–15% of clinically recognized pregnancies. The vast majority (up to 50–70%) of sporadic first-trimester losses are due to **fetal chromosomal anomalies** (most commonly autosomal trisomies), which are typically random events. Statistically, after a **single** spontaneous loss, the risk of a subsequent miscarriage remains approximately **15%**, which is essentially the same as the baseline risk for the general population. **Analysis of Incorrect Options:** * **Option A:** While the genetic makeup explains *why* the first loss occurred, it does not dictate the *recurrence risk* for a subsequent pregnancy unless a parental balanced translocation is present (which is rare in sporadic cases). * **Option C:** A risk of 25% is typically seen only after **two** consecutive miscarriages. * **Option D:** A risk greater than 40–50% is generally reserved for patients with **three or more** consecutive losses (Recurrent Pregnancy Loss). **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of sporadic miscarriage:** Fetal Chromosomal Anomaly (Trisomy is the most common; **Trisomy 16** is the most frequent specific trisomy). * **Most common single chromosomal anomaly:** Monosomy X (Turner Syndrome, 45,X). * **Recurrence Risk Progression:** * After 1 loss: ~15% (Baseline) * After 2 losses: ~25% * After 3 losses: ~30–45% * **Management:** For a single first-trimester loss, no extensive workup is indicated. Reassurance is the primary management strategy. Investigation for Recurrent Pregnancy Loss (RPL) is traditionally initiated after 3 consecutive losses, though many clinicians start after 2.

Q: All are prognostic indicators of pre-eclampsia, except:

High serum Sodium. In pre-eclampsia, the pathophysiology involves widespread endothelial dysfunction and vasospasm, leading to multi-organ involvement. Prognostic indicators are markers that reflect the severity of this systemic damage. **Why High Serum Sodium is the Correct Answer:** Serum sodium levels are typically **not** used as a prognostic marker for pre-eclampsia. In fact, sodium levels in pre-eclampsia are usually normal or slightly decreased (hyponatremia) due to the activation of the renin-angiotensin-aldosterone system and fluid shifts into the extravascular space (edema). Hypernatremia is not a characteristic feature or a marker of severity in this condition. **Analysis of Incorrect Options:** * **Low Platelets (Thrombocytopenia):** A hallmark of severe pre-eclampsia and HELLP syndrome. A platelet count <100,000/mm³ indicates significant endothelial damage and consumption, signaling a poor prognosis. * **Elevated Liver Enzymes:** Reflects hepatic ischemia or periportal hemorrhage (as seen in HELLP syndrome). Elevated ALT/AST levels are "red flags" for impending complications like hepatic rupture or eclampsia. * **High Serum Uric Acid:** Hyperuricemia is one of the earliest and most reliable indicators of pre-eclampsia severity. It results from decreased renal clearance (due to reduced GFR) and increased tubular reabsorption, correlating strongly with poor fetal outcomes. **NEET-PG High-Yield Pearls:** * **Most specific biochemical marker:** Serum Uric Acid (>6 mg/dL is significant). * **HELLP Syndrome:** Hemolysis, Elevated Liver enzymes, Low Platelets. * **Proteinuria:** While used for diagnosis (≥300 mg/24h), the *degree* of proteinuria is no longer used to classify "severe" features in modern ACOG guidelines, though it remains a classic prognostic sign. * **Definitive Treatment:** Delivery of the fetus and placenta.

Q: All the following are indications for delivery in women <34 weeks' gestation managed expectantly with severe preeclampsia, EXCEPT:

Raised umbilical artery Doppler indices. **Explanation:** In the management of severe preeclampsia before 34 weeks, the goal of expectant management is to improve neonatal outcomes by increasing gestational age. However, delivery is indicated when maternal or fetal risks outweigh the benefits of prolongation. **1. Why "Raised Umbilical Artery Doppler Indices" is the correct answer:** Isolated raised umbilical artery (UA) Doppler indices (like an increased S/D ratio or Pulsatility Index) indicate increased placental resistance but are **not** an absolute indication for immediate delivery in severe preeclampsia. In such cases, expectant management can continue with intensive monitoring. Delivery is only mandated if there is **absent or reversed end-diastolic flow (AEDF/REDF)**, or if other fetal testing (like a non-reactive NST or low Biophysical Profile) becomes abnormal. **2. Why the other options are wrong (Indications for Delivery):** * **Eclampsia (B):** The onset of seizures is a maternal emergency. Once the mother is stabilized, delivery must be initiated regardless of gestational age. * **Pulmonary Edema (C):** This indicates severe end-organ decompensation. Continued pregnancy poses a life-threatening risk to the mother. * **Placental Abruption (D):** This is an obstetric emergency that can lead to maternal hemorrhage and fetal demise, necessitating immediate delivery. **Clinical Pearls for NEET-PG:** * **Maternal Indications for Delivery:** Uncontrolled severe hypertension, eclampsia, pulmonary edema, placental abruption, DIC, or persistent neurological symptoms. * **Fetal Indications for Delivery:** Abnormal BPP (<4), REDF on UA Doppler, or fetal death. * **HELLP Syndrome:** While often an indication for delivery, some guidelines allow for a 48-hour delay for steroid administration if the mother is stable and <34 weeks. * **Magnesium Sulfate:** Always the drug of choice for seizure prophylaxis in severe preeclampsia.

Q: Ultrasonography of the umbilical artery is performed to assess which parameter?

Fetal heart rate. **Explanation:** The correct answer is **A. Fetal heart rate.** In the context of basic obstetric ultrasonography, the umbilical artery is a primary site for assessing the fetal cardiovascular system. The pulsatile flow within the umbilical artery directly reflects the fetal cardiac cycle. By placing a Doppler gate over the umbilical artery, clinicians can visualize the systolic and diastolic peaks, allowing for an accurate calculation of the **Fetal Heart Rate (FHR)**. This is particularly useful in early pregnancy or when the fetal heart itself is difficult to visualize clearly. **Why other options are incorrect:** * **B. Gestational age:** This is assessed using biometric parameters such as Crown-Rump Length (CRL) in the first trimester, or Biparietal Diameter (BPD), Head Circumference (HC), and Femur Length (FL) in the second and third trimesters. * **C. Fetal weight:** Estimated Fetal Weight (EFW) is calculated using Hadlock’s formula, which incorporates BPD, HC, Abdominal Circumference (AC), and FL. * **D. Fetal maturity:** This refers to functional readiness (e.g., lung maturity), traditionally assessed via amniocentesis (L/S ratio) or clinical dating, rather than umbilical artery Doppler. **Clinical Pearls for NEET-PG:** * **Umbilical Artery Doppler:** Beyond FHR, it is primarily used to monitor **placental insufficiency**. * **Abnormal Waveforms:** The progression of placental resistance is marked by: Reduced End-Diastolic Velocity (EDV) → **Absent End-Diastolic Velocity (AEDV)** → **Reversed End-Diastolic Velocity (REDV)**. * **High-Yield Fact:** AEDV and REDV are critical markers of fetal compromise in Intrauterine Growth Restriction (IUGR) and often indicate the need for urgent delivery.

Question 1

Amniotic fluid alpha-fetoprotein levels are typically elevated in which of the following conditions?

Accepted Answer

Open neural tube defect

Answer

Traumatic amniocentesis

Answer

Intrauterine fetal death

Answer

None of the above

Question 2

A woman at 32 weeks of gestation presents with labor pains. On examination, her cervix is 2 cm dilated and one uterine contraction is felt every 20-30 seconds. What is the appropriate management?

Accepted Answer

Isoxsuprine hydrochloride

Answer

Wait and watch

Answer

Augmentation of labor

Answer

Emergency lower segment cesarean section

Question 3

What is the most effective and safe drug to control eclampsia?

Accepted Answer

Magnesium sulfate

Answer

Phenytoin

Answer

Diazepam

Answer

None of the above

Question 4

A 150 cm tall pregnant woman with a hemoglobin of 11 gm%, blood pressure of 160/110 mm Hg, and a 12 kg weight gain during pregnancy delivered an intrauterine growth restriction (IUGR) baby. What are the causes of IUGR in this case?

Accepted Answer

Hypertension

Answer

Maternal infection

Answer

Short maternal stature

Answer

Excessive weight gain during pregnancy

Question 5

A 37-week pregnant lady presents with a BP of 150/100 mmHg and 3+ proteinuria. On pelvic examination, the cervix is soft with 50% effacement, station is '-2', the pelvis is adequate, and the cervical os is 1 cm dilated. What is the most appropriate next step?

Accepted Answer

Induction of labor

Answer

Observation with monitoring of blood pressure

Answer

Antihypertensives and await spontaneous labor

Answer

Cesarean section

Question 6

After an initial pregnancy resulting in a spontaneous loss in the first trimester, a patient is concerned about the possibility of this recurring. What is the approximate chance of recurrence?

Accepted Answer

Is no different than it was prior to the miscarriage

Answer

Depends on the genetic makeup of the prior abortus

Answer

Is increased to approximately 25%

Answer

Is increased most likely to greater than 50%

Question 7

All are prognostic indicators of pre-eclampsia, except:

Accepted Answer

High serum Sodium

Answer

Low platelets

Answer

Elevated liver enzymes

Answer

High serum Uric acid

Question 8

All the following are indications for delivery in women <34 weeks' gestation managed expectantly with severe preeclampsia, EXCEPT:

Accepted Answer

Raised umbilical artery Doppler indices

Answer

Eclampsia

Answer

Pulmonary edema

Answer

Placental abruption

Question 9

Selective reduction of multi-chorionic, multi-fetal gestation is performed around which gestational age?

Accepted Answer

10 to 13 weeks

Answer

4 to 6 weeks

Answer

8 to 10 weeks

Answer

16 to 20 weeks

Question 10

Ultrasonography of the umbilical artery is performed to assess which parameter?

Accepted Answer

Fetal heart rate

Answer

Gestational age

Answer

Fetal weight

Answer

Fetal maturity

Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine — MCQs

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