Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine Indian Medical PG Practice Questions and MCQs

Question 441: Which of the following is NOT considered a high-risk pregnancy factor?

A. Elderly primigravida
B. Short stature primigravida
C. Vertex presentation (Correct Answer)
D. Diabetes

Explanation: **Explanation:** In obstetrics, a **high-risk pregnancy** is one where the mother, the fetus, or the neonate is at an increased risk of morbidity or mortality before, during, or after delivery. **Why Vertex Presentation is the Correct Answer:** **Vertex presentation** is the most common and **normal (physiological)** presentation where the fetal head is well-flexed, allowing the smallest diameters of the skull to engage in the maternal pelvis. It is the ideal presentation for a spontaneous vaginal delivery and is not a risk factor; rather, it is the desired clinical finding. **Analysis of Incorrect Options (High-Risk Factors):** * **Elderly Primigravida:** Defined as a woman over **35 years** of age pregnant for the first time. It is high-risk due to increased associations with chromosomal abnormalities (Down syndrome), gestational diabetes, pre-eclampsia, and higher rates of operative interventions. * **Short Stature Primigravida:** Usually defined as a height **<140–145 cm**. This is a significant risk factor for **Cephalopelvic Disproportion (CPD)** and obstructed labor, often necessitating a Cesarean section. * **Diabetes:** Both pre-gestational and Gestational Diabetes Mellitus (GDM) are high-risk. They increase the risk of fetal macrosomia, shoulder dystocia, congenital malformations, and neonatal hypoglycemia. **NEET-PG High-Yield Pearls:** * **Malpresentations** (Breech, Transverse, Face, or Brow) are considered high-risk, unlike Vertex. * **Grand Multipara** (Para 4 or more) is also a high-risk factor due to risks of malpresentation, placenta previa, and postpartum hemorrhage (PPH). * **Previous Cesarean Section** is a major high-risk factor due to the risk of uterine rupture and morbidly adherent placenta (Placenta Accreta Spectrum).

Question 442: Which among the following is the most common chromosomal anomaly encountered in spontaneously aborted fetuses?

A. Trisomy 13
B. Trisomy 18
C. Trisomy 21
D. Trisomy 16 (Correct Answer)

Explanation: **Explanation:** Chromosomal abnormalities are the leading cause of spontaneous abortions, accounting for approximately 50–60% of first-trimester miscarriages. Among these, **Autosomal Trisomies** are the most frequent category (approx. 50% of all abnormal cases). **Why Trisomy 16 is the correct answer:** While Trisomy 21 is the most common trisomy seen in live births, **Trisomy 16** is the most common trisomy encountered in spontaneous abortions. It is considered lethal in its non-mosaic form and is virtually never seen in live-born infants. It accounts for nearly one-third of all trisomic abortions. **Analysis of Incorrect Options:** * **Trisomy 13 (Patau Syndrome) & Trisomy 18 (Edwards Syndrome):** While these are common autosomal trisomies that lead to significant phenotypic abnormalities and high rates of intrauterine fetal death, their individual prevalence in early miscarriages is significantly lower than that of Trisomy 16. * **Trisomy 21 (Down Syndrome):** This is the most common trisomy among **live births** because it has a higher survival rate in utero compared to other trisomies. However, in the context of early spontaneous abortions, it is less frequent than Trisomy 16. **NEET-PG High-Yield Pearls:** 1. **Most common single chromosomal anomaly:** Turner Syndrome (45,X) — *Note: While Trisomy 16 is the most common trisomy, 45,X is the most common specific karyotype.* 2. **Most common class of anomaly:** Autosomal Trisomy. 3. **Triploidy:** Often associated with partial hydatidiform moles. 4. **Recurrent Pregnancy Loss (RPL):** The most common parental chromosomal anomaly is a **Balanced Reciprocal Translocation**.

Question 443: What is the specific treatment for severe pre-eclampsia?

A. Magnesium sulfate
B. Termination of pregnancy (Correct Answer)
C. Anticonvulsants
D. Antihypertensives

Explanation: **Explanation:** The definitive treatment for severe pre-eclampsia is the **termination of pregnancy (delivery)**. This is because the underlying pathophysiology of pre-eclampsia is rooted in abnormal placentation and placental ischemia. Since the placenta is the source of the anti-angiogenic factors (like sFlt-1) that cause systemic endothelial dysfunction, the disease process can only be halted by the removal of the placenta. **Analysis of Options:** * **A. Magnesium Sulfate:** This is the drug of choice for the *prevention* of seizures (eclampsia) and for neuroprotection in preterm deliveries, but it does not cure the underlying disease. * **C. Anticonvulsants:** While MgSO4 is technically an anticonvulsant used here, other traditional anticonvulsants (like diazepam or phenytoin) are not first-line and do not treat the core pathology. * **D. Antihypertensives:** Drugs like Labetalol, Hydralazine, or Nifedipine are used to prevent maternal complications like hemorrhagic stroke by managing blood pressure, but they do not stop the progression of pre-eclampsia. **Clinical Pearls for NEET-PG:** * **Definitive Treatment:** Delivery (regardless of gestational age if the condition is unstable). * **Drug of Choice (DOC) for Seizure Prophylaxis:** Magnesium sulfate (Pritchard Regimen or Zuspan Regimen). * **Antidote for MgSO4 Toxicity:** Calcium gluconate (10 ml of 10% solution IV). * **Target BP:** In severe pre-eclampsia, the goal is to keep systolic BP between 140–150 mmHg and diastolic BP between 90–100 mmHg to prevent cerebral hemorrhage. * **Indication for Delivery:** In severe pre-eclampsia, delivery is usually indicated at **34 weeks**, whereas in mild pre-eclampsia, it is **37 weeks**.

Question 444: Which of the following is NOT typically associated with gestational diabetes mellitus?

A. History of a previous macrosomic baby
B. Obesity
C. Congenital malformations (Correct Answer)
D. Polyhydramnios

Explanation: **Explanation:** The key to answering this question lies in the **timing of hyperglycemia**. **1. Why "Congenital Malformations" is the correct answer:** Congenital malformations (like sacral agenesis or cardiac defects) occur during **organogenesis**, which takes place in the first trimester (weeks 3–8). **Gestational Diabetes Mellitus (GDM)**, by definition, is glucose intolerance that develops or is first recognized in the **second or third trimester** (usually after 24 weeks), well after organogenesis is complete. Therefore, GDM does not increase the risk of structural anomalies. In contrast, **Pre-gestational (Pregestational) Diabetes** involves hyperglycemia during the first trimester, which is highly teratogenic. **2. Analysis of Incorrect Options:** * **A. History of a previous macrosomic baby:** This is a classic risk factor. A history of delivering a baby >4kg suggests undiagnosed glucose intolerance in a previous pregnancy. * **B. Obesity:** Maternal BMI >30 kg/m² is a major risk factor for GDM due to pre-existing insulin resistance. * **D. Polyhydramnios:** GDM causes fetal hyperglycemia, leading to **fetal osmotic diuresis** (increased fetal urination). This excess urine increases the amniotic fluid volume. **Clinical Pearls for NEET-PG:** * **Most common malformation in Pre-gestational DM:** Cardiac defects (specifically VSD). * **Most specific malformation in Pre-gestational DM:** Caudal Regression Syndrome (Sacral agenesis). * **Screening:** The DIPSI criteria (75g oral glucose regardless of fasting status) is the gold standard in India. * **Macrosomia in GDM:** Is characterized by "selective organomegaly" (increased fat and shoulder circumference), increasing the risk of **shoulder dystocia**.

Question 445: Low maternal serum 25-hydroxyvitamin D is associated with all of the following pregnancy and neonatal outcomes, EXCEPT:

A. Gestational Diabetes
B. Pre-eclampsia
C. Caesarian Section (Correct Answer)
D. Small for Gestational Age Neonate

Explanation: **Explanation:** Vitamin D (25-hydroxyvitamin D) plays a crucial role in pregnancy, acting as a potent immunomodulator and regulator of glucose metabolism and placental development. **Why Caesarean Section is the Correct Answer:** While early observational studies suggested a link between Vitamin D deficiency and increased rates of primary C-sections (theoretically due to impaired pelvic muscle strength), large-scale meta-analyses and Cochrane reviews have **not** consistently demonstrated a statistically significant association. Therefore, C-section is not considered a definitive outcome of low maternal Vitamin D levels in current evidence-based guidelines. **Analysis of Incorrect Options:** * **Gestational Diabetes (GDM):** Vitamin D influences insulin secretion and sensitivity. Low levels are associated with increased insulin resistance and a higher risk of GDM. * **Pre-eclampsia:** Vitamin D modulates the renin-angiotensin system and promotes healthy placental angiogenesis. Deficiency is linked to endothelial dysfunction and an increased risk of hypertensive disorders of pregnancy. * **Small for Gestational Age (SGA):** Vitamin D is vital for optimal placental function and fetal bone mineralization. Low levels are associated with restricted fetal growth and lower birth weights. **NEET-PG High-Yield Pearls:** * **Active Form:** 1,25-dihydroxyvitamin D3 (Calcitriol). * **Storage Form:** 25-hydroxyvitamin D (Calcidiol) – this is the form measured to assess status. * **Fetal Source:** The fetus depends entirely on maternal transfer of 25(OH)D across the placenta. * **Neonatal Impact:** Severe maternal deficiency can lead to neonatal hypocalcemia, tetany, and congenital rickets.

Question 446: A couple with an Rh-positive female and an Rh-negative male seeks counseling regarding pregnancy. What is the recommended course of action?

A. No treatment is needed. (Correct Answer)
B. Administer vaccine to the mother after the birth of the first baby.
C. Administer vaccine to the first baby.
D. Administer vaccine to the father.

Explanation: ### Explanation **Core Concept: Rh Isoimmunization Pathophysiology** Rh isoimmunization occurs only when an **Rh-negative mother** carries an **Rh-positive fetus**. This happens if the biological father is Rh-positive. In this scenario, fetal red blood cells (carrying the D-antigen) enter the maternal circulation, causing the mother to produce anti-D antibodies that can cross the placenta and cause Hemolytic Disease of the Fetus and Newborn (HDFN). In this specific question, the **mother is Rh-positive**. Since she already possesses the D-antigen on her red blood cells, her immune system recognizes the antigen as "self." Even if the fetus were Rh-negative (inherited from the father), the mother's immune system would not produce antibodies against it. Therefore, there is **no risk of isoimmunization**, and no treatment or prophylaxis is required. **Analysis of Incorrect Options:** * **Option B:** Anti-D immunoglobulin (often mislabeled as "vaccine" in exams) is only administered to Rh-negative mothers who give birth to Rh-positive babies to prevent sensitization. * **Option C:** The baby does not require immunization; the goal of treatment is always to prevent the mother from forming antibodies. * **Option D:** The father’s Rh status is only relevant if the mother is Rh-negative. Administering treatment to the father has no clinical utility in preventing HDFN. **High-Yield NEET-PG Pearls:** * **The Rule:** Only an **Rh-negative mother** with an **Rh-positive fetus** is at risk. * **Standard Prophylaxis:** For an unsensitized Rh-negative mother, 300 mcg of Anti-D is given at **28 weeks** gestation and again within **72 hours of delivery** (if the neonate is Rh-positive). * **Kleihaur-Betke Test:** Used to quantify the volume of feto-maternal hemorrhage to determine if additional doses of Anti-D are needed. * **Indirect Coombs Test (ICT):** Performed on the mother to check for existing sensitization. If ICT is positive, Anti-D is no longer effective.

Question 447: A 35 weeks pregnant woman has ultrasound parameters corresponding to gestational age. Doppler shows absent end diastolic flow. What is the recommended management?

A. Monitor until end diastolic flow becomes reversed or until 37 weeks gestation
B. Monitor until 37 weeks gestation
C. Administer steroids and wait for 48 hours
D. Plan for termination (Correct Answer)

Explanation: **Explanation:** The core issue in this scenario is **Absent End Diastolic Flow (AEDF)** in the umbilical artery, which signifies high placental resistance and impending fetal compromise. **1. Why "Plan for termination" is correct:** According to standard management protocols for Fetal Growth Restriction (FGR) and placental insufficiency, the presence of AEDF at **≥34 weeks** of gestation is a definitive indication for delivery. At 35 weeks, the risks of intrauterine fetal demise (IUFD) due to chronic hypoxia outweigh the risks of prematurity. Therefore, the pregnancy should be terminated (delivered), usually via Cesarean section if the Bishop score is unfavorable or fetal distress is evident. **2. Why the other options are incorrect:** * **Options A & B:** Monitoring until 37 weeks or until the flow reverses is dangerous. AEDF is a late-stage marker; waiting further increases the risk of acidosis and stillbirth. Expectant management is only considered if the fetus is <34 weeks to gain maturity, but even then, it requires intensive monitoring. * **Option C:** While steroids (Betamethasone/Dexamethasone) are administered for fetal lung maturity if delivery is planned between 24 and 36+6 weeks, the question asks for the "management" of the pregnancy. "Waiting for 48 hours" is secondary to the primary decision to terminate. In practice, steroids are given *while* preparing for delivery, but the definitive management plan is termination. **Clinical Pearls for NEET-PG:** * **S/D Ratio:** The first Doppler sign of placental insufficiency is an increased Systolic/Diastolic ratio. * **AEDF:** Delivery is indicated at **≥34 weeks**. * **REDF (Reversed End Diastolic Flow):** This is a critical emergency. Delivery is indicated at **≥30-32 weeks**. * **Ductus Venosus:** Abnormal flow (absent/reversed a-wave) in the ductus venosus is the most sensitive predictor of imminent fetal death.

Question 448: Which of the following is NOT an explanation for decreased variability of the fetal heart rate tracing?

A. Fetal sleep state
B. Prematurity
C. Barbiturate ingestion
D. Fetal stimulation (Correct Answer)

Explanation: **Explanation:** Fetal heart rate (FHR) variability represents the fine-tuning of the fetal cardiac output by the interplay between the sympathetic and parasympathetic nervous systems. It is the single most important indicator of an intact neurological pathway and fetal oxygenation. **Why Fetal Stimulation is the correct answer:** Fetal stimulation (e.g., scalp stimulation or vibroacoustic stimulation) is used to provoke a response in a fetus with a non-reactive or quiet trace. It typically causes **increased variability** and **accelerations**, confirming fetal well-being and the absence of acidosis. Therefore, it does not cause decreased variability. **Why the other options are incorrect:** * **Fetal sleep state:** This is the most common cause of transiently decreased variability. Fetal "quiet sleep" cycles usually last 20–40 minutes; if variability is low, the clinician should wait or stimulate the fetus to rule out sleep. * **Prematurity:** Variability is dependent on the maturation of the autonomic nervous system. In very preterm fetuses (especially <28 weeks), the parasympathetic system is underdeveloped, leading to naturally lower baseline variability. * **Barbiturate ingestion:** Central nervous system (CNS) depressants, including barbiturates, benzodiazepines, and opioids (like pethidine), cross the placenta and suppress fetal brain activity, leading to a "flat" or diminished variability trace. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** Normal variability is **6–25 bpm**. * **Minimal variability:** ≤5 bpm; **Absent:** Undetectable; **Marked:** >25 bpm. * **Sinusoidal Pattern:** A specific type of absent variability indicating severe fetal anemia (e.g., Rh isoimmunization) or acute hypoxia. * **Management:** If decreased variability persists >40 minutes despite stimulation, consider fetal hypoxia, acidosis, or drug effects.

Question 449: On a routine first-trimester ultrasound at 6 weeks, the gestational sac is seen separate from the endometrium and more than 1 cm away from the most lateral edge of the uterine cavity. The "interstitial line sign" is observed. What is your diagnosis?

A. Angular pregnancy
B. Interstitial pregnancy (Correct Answer)
C. Cornual pregnancy
D. Isthmic pregnancy

Explanation: **Explanation:** The correct diagnosis is **Interstitial pregnancy**, a specific type of ectopic pregnancy where the blastocyst implants within the proximal, intramural portion of the fallopian tube as it traverses the muscular uterine wall. **Why it is correct:** The diagnosis is confirmed by three classic sonographic criteria: 1. **Empty uterine cavity:** The gestational sac is seen separate from the endometrium. 2. **Eccentric location:** The sac is located more than 1 cm from the most lateral edge of the uterine cavity. 3. **Interstitial line sign:** This is a highly specific high-yield finding where a thin echogenic line extends from the endometrial canal to the center of the ectopic gestational sac, representing the interstitial portion of the fallopian tube. **Why the other options are incorrect:** * **Angular pregnancy:** The embryo implants in the lateral angle of the uterine cavity, *medial* to the uterotubal junction. Unlike interstitial pregnancy, it is surrounded by myometrium and can potentially progress to a viable term delivery, though with higher risks. * **Cornual pregnancy:** This term is often used interchangeably but strictly refers to a pregnancy in the horn of a **bicornuate or unicornuate uterus**. * **Isthmic pregnancy:** This refers to an ectopic pregnancy in the narrow, extra-uterine portion of the fallopian tube (isthmus), not within the uterine wall. **Clinical Pearls for NEET-PG:** * **Risk of Rupture:** Interstitial pregnancies often rupture later (12–14 weeks) than other tubal pregnancies because the myometrium allows for more expansion. * **Hemorrhage:** Rupture can lead to catastrophic, life-threatening hemorrhage due to the proximity of the **uterine and ovarian artery anastomosis** (Sampson’s artery). * **Management:** While methotrexate can be used in stable cases, surgical management often requires cornual resection or hysterectomy.

Question 450: Itching during cholestasis of pregnancy is primarily due to retained which substance?

A. Bilirubin
B. Bile acids
C. Alkaline phosphatase
D. Bile salts (Correct Answer)

Explanation: **Explanation:** **Intrahepatic Cholestasis of Pregnancy (ICP)** is a reversible form of hormonal cholestasis occurring typically in the third trimester. The correct answer is **Bile salts**. 1. **Why Bile Salts?** The primary pathophysiology involves the failure of the liver to excrete bile acids into the biliary canaliculi, leading to their accumulation in the maternal serum. These bile acids are converted into **bile salts**, which deposit in the peripheral dermis. These salts act as pruritogens, irritating sensory nerve endings and causing the characteristic intense pruritus (itching), which typically starts on the palms and soles and worsens at night. 2. **Why other options are incorrect:** * **Bilirubin:** While mild jaundice can occur in 10-20% of cases (cholestatic jaundice), it is a late finding. Itching in ICP often precedes any rise in bilirubin. * **Alkaline Phosphatase (ALP):** ALP levels are physiologically elevated in pregnancy due to placental production. While they rise further in ICP, ALP itself does not cause itching. * **Bile acids:** While "bile acids" and "bile salts" are often used interchangeably in clinical practice, the **salts** (conjugated form) are the specific chemical irritants deposited in the skin. In MCQ exams, "Bile salts" is the more precise physiological answer for the cause of pruritus. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Elevated **Serum Bile Acids (>10 μmol/L)** is the most sensitive biochemical marker. * **Treatment:** **Ursodeoxycholic Acid (UDCA)** is the drug of choice (improves itching and liver functions). * **Fetal Risk:** ICP is associated with increased risks of preterm labor, meconium-stained liquor, and **sudden intrauterine fetal death (IUFD)** due to fetal arrhythmias caused by high bile acid levels. * **Delivery:** Induction is usually recommended at **37 weeks** to prevent late-term stillbirth.

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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