Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine Indian Medical PG Practice Questions and MCQs

Question 311: Amniotic fluid alpha-fetoprotein levels are typically elevated in which of the following conditions?

A. Traumatic amniocentesis
B. Open neural tube defect (Correct Answer)
C. Intrauterine fetal death
D. None of the above

Explanation: ### 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.

Question 312: 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?

A. Maternal infection
B. Short maternal stature
C. Hypertension (Correct Answer)
D. Excessive weight gain during pregnancy

Explanation: **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).

Question 313: What is the cause of late decelerations on a Non-Stress Test (NST)?

A. Head compression
B. Uteroplacental insufficiency (Correct Answer)
C. Cord compression
D. All of the above

Explanation: **Explanation:** Late decelerations are characterized by a gradual decrease and return of the fetal heart rate (FHR) associated with a uterine contraction, where the nadir (lowest point) of the deceleration occurs **after** the peak of the contraction. **1. Why Uteroplacental Insufficiency is Correct:** The underlying mechanism is **fetal hypoxia**. During a contraction, uterine blood flow decreases. In a healthy placenta, fetal reserves are sufficient; however, in **uteroplacental insufficiency**, this transient drop in oxygen triggers fetal chemoreceptors. This results in a reflex alpha-adrenergic response, causing hypertension and a subsequent vagal-mediated slowing of the heart rate. Because it takes time for the oxygen levels to drop below the critical threshold and for the chemoreceptor reflex to kick in, the deceleration is delayed (late) relative to the contraction. **2. Why Other Options are Incorrect:** * **Head Compression (Option A):** This causes **Early Decelerations**. The pressure on the fetal head increases intracranial pressure, stimulating the vagus nerve. These are "mirror images" of contractions and are considered physiological (benign). * **Cord Compression (Option B):** This causes **Variable Decelerations**. These are abrupt in onset and vary in shape, size, and timing relative to contractions. They are the most common type of deceleration seen in labor. **High-Yield Clinical Pearls for NEET-PG:** * **VEAL CHOP Mnemonic:** **V**ariable = **C**ord; **E**arly = **H**ead; **A**ccelerations = **O**k; **L**ate = **P**lacenta. * Late decelerations are always considered **pathological** (non-reassuring) and indicate a high risk for fetal acidemia. * **Management:** Intrauterine resuscitation (Left lateral position, Oxygen, IV fluids, stopping Oxytocin). If persistent, urgent delivery is indicated.

Question 314: 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?

A. Depends on the genetic makeup of the prior abortus
B. Is no different than it was prior to the miscarriage (Correct Answer)
C. Is increased to approximately 25%
D. Is increased most likely to greater than 50%

Explanation: ### 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.

Question 315: What is the recommended duration for HIV treatment in pregnancy?

A. From the time of diagnosis until lifelong therapy. (Correct Answer)
B. From after the first trimester until lifelong therapy.
C. From the time of diagnosis until the puerperium.
D. From after pregnancy until lifelong therapy.

Explanation: **Explanation:** The management of HIV in pregnancy is governed by the principle of **Option B+**, which is the current standard of care recommended by the WHO and NACO. **Why Option A is correct:** The primary goals of Antiretroviral Therapy (ART) in pregnancy are to achieve an undetectable viral load to prevent **Mother-to-Child Transmission (MTCT)** and to maintain the mother’s health. Treatment should be initiated **immediately upon diagnosis**, regardless of the gestational age or CD4 count. Once started, ART is continued for life to prevent clinical progression and transmission to partners. **Why other options are incorrect:** * **Option B:** Delaying treatment until after the first trimester increases the risk of vertical transmission. While there were historical concerns regarding teratogenicity (e.g., Efavirenz), current evidence confirms that the benefits of early viral suppression far outweigh the risks. * **Option C:** Stopping ART after the puerperium (postpartum period) leads to a rebound in viral load, compromising maternal immunity and increasing the risk of transmission during future pregnancies or breastfeeding. * **Option D:** Waiting until after pregnancy leaves the fetus unprotected during the period of highest transmission risk (intrapartum). **High-Yield Clinical Pearls for NEET-PG:** * **Preferred Regimen (NACO):** TLD regimen—**T**enofovir (300mg) + **L**amivudine (300mg) + **D**olutegravir (50mg). * **Transmission Risk:** Without intervention, the risk is 20–45%. With effective ART and viral suppression (<50 copies/mL), the risk drops to **<1%**. * **Breastfeeding:** In India, exclusive breastfeeding for 6 months is recommended even for HIV-positive mothers, provided they are adherent to ART. * **Infant Prophylaxis:** Nevirapine syrup is typically given to the infant for 6 weeks (extendable to 12 weeks if maternal ART duration was inadequate).

Question 316: All are prognostic indicators of pre-eclampsia, except:

A. Low platelets
B. High serum Sodium (Correct Answer)
C. Elevated liver enzymes
D. High serum Uric acid

Explanation: 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.

Question 317: All the following are indications for delivery in women <34 weeks' gestation managed expectantly with severe preeclampsia, EXCEPT:

A. Raised umbilical artery Doppler indices (Correct Answer)
B. Eclampsia
C. Pulmonary edema
D. Placental abruption

Explanation: **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.

Question 318: Selective reduction of multi-chorionic, multi-fetal gestation is performed around which gestational age?

A. 4 to 6 weeks
B. 8 to 10 weeks
C. 10 to 13 weeks (Correct Answer)
D. 16 to 20 weeks

Explanation: **Explanation:** **Selective Fetal Reduction (SFR)** is a procedure performed in multifetal pregnancies (usually triplets or higher) to reduce the number of fetuses, thereby improving the chances of survival for the remaining fetuses and decreasing maternal morbidity. **Why 10 to 13 weeks is the correct answer:** The ideal window for SFR is the **late first trimester (10–13 weeks)** for several physiological and clinical reasons: 1. **Spontaneous Resorption:** By 10 weeks, the risk of "vanishing twin" (spontaneous loss) has largely passed, ensuring the clinician doesn't reduce a fetus that would have naturally resorbed. 2. **Aneurploidy Screening:** At this stage, Nuchal Translucency (NT) scans and early anatomy surveys can be performed. This allows the clinician to selectively reduce the fetus with the highest risk of chromosomal or structural anomalies. 3. **Procedure Safety:** The uterus is large enough for easy transabdominal ultrasound-guided access, but the gestational sacs are small enough that the risk of triggering a miscarriage of the remaining fetuses is minimized (approx. 4-5%). **Analysis of Incorrect Options:** * **4 to 6 weeks:** Too early; spontaneous loss is common, and fetal structures are not yet clearly visualized for targeted reduction. * **8 to 10 weeks:** While possible, it precedes the window for optimal genetic screening (NT scan). * **16 to 20 weeks:** This is the timing for **Selective Termination** (used for specific anomalies in a twin). Performing a reduction this late carries a significantly higher risk of preterm labor, infection, and pregnancy loss. **High-Yield Clinical Pearls for NEET-PG:** * **Method of Choice:** Transabdominal ultrasound-guided **intracardiac Potassium Chloride (KCl)** injection is the standard for dichorionic/multichorionic gestations. * **Monochorionic Twins:** KCl is **contraindicated** in monochorionic twins due to vascular anastomoses (it would kill both fetuses). Instead, **Radiofrequency Ablation (RFA)** or cord occlusion is used. * **Goal:** Usually to reduce the pregnancy to twins (Dichorionic Diamniotic).

Question 319: Which of the following is an abnormal finding during pregnancy?

A. Venous hum
B. Third heart sound
C. Diastolic murmur
D. Supraclavicular murmur (Correct Answer)

Explanation: **Explanation:** In pregnancy, the cardiovascular system undergoes significant physiological changes, including a 40–50% increase in blood volume and a rise in cardiac output. These changes lead to a hyperdynamic circulation, which commonly produces **functional (physiological) murmurs**. **Why Option D is the Correct Answer:** While many murmurs are physiological, a **supraclavicular murmur** (also known as a brachiocephalic bruit) is generally considered **abnormal** or non-physiological in the context of pregnancy. It often indicates underlying pathology, such as arterial stenosis or increased flow through the carotid/subclavian arteries that is not part of normal gestational adaptation. (Note: While some texts debate its rarity, in the context of standard NEET-PG curriculum, it is categorized as abnormal compared to the common benign findings listed). **Analysis of Incorrect Options:** * **A. Venous hum:** This is a continuous murmur heard over the supraclavicular fossa due to increased blood flow in the internal jugular veins. It is a common, benign finding in pregnancy. * **B. Third heart sound (S3):** A physiological S3 is heard in up to 80% of pregnant women due to rapid ventricular filling in a hyperdynamic state. It is not indicative of heart failure in this context. * **C. Diastolic murmur:** While most diastolic murmurs are pathological, a **transient soft diastolic murmur** (e.g., a "Mammary Souffle" or flow murmur) can occur in up to 10% of normal pregnancies due to increased flow through the internal mammary artery. **High-Yield Facts for NEET-PG:** * **Normal findings:** Shift of the apex beat (upward and lateral), loud S1, exaggerated splitting of S1, and physiological S3. * **Mammary Souffle:** A systolic-diastolic murmur heard over the breasts (usually late pregnancy/lactation); it disappears with firm pressure from the stethoscope. * **Red Flag:** A **Fourth heart sound (S4)** is almost always **pathological** in pregnancy.

Question 320: Ultrasonography of the umbilical artery is performed to assess which parameter?

A. Fetal heart rate (Correct Answer)
B. Gestational age
C. Fetal weight
D. Fetal maturity

Explanation: **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.

Practice by Chapter

Fetal Assessment Techniques

Practice Questions

Hypertensive Disorders in Pregnancy

Practice Questions

Intrauterine Growth Restriction

Practice Questions

Multiple Gestation

Practice Questions

Rh Isoimmunization and Other Blood Group Incompatibilities

Practice Questions

Intrauterine Fetal Therapy

Practice Questions

Prenatal Diagnosis and Genetic Counseling

Practice Questions

Placental Abnormalities

Practice Questions

Preterm Labor and Delivery

Practice Questions

Management of Medical Disorders in Pregnancy

Practice Questions

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