Maternal-Fetal Medicine — MCQs

A 38-year-old woman is in her first pregnancy, which has been uneventful until the 34th week, when she develops swelling of feet and hands. An obstetric check-up reveals that she also has hypertension and proteinuria. Laboratory analysis shows elevated aspartate aminotransferase (AST) and alanine aminotransferase (ALT) and slightly decreased platelets. What is the initial event in the pathogenesis of her condition?

Maternal-Fetal Medicine Indian Medical PG Practice Questions and MCQs

Question 781: What is the blood flow in the intervillous space at term?

A. 150 ml (Correct Answer)
B. 250 ml
C. 300 ml
D. 500 ml

Explanation: ### Explanation **Correct Answer: A. 150 ml** The **intervillous space (IVS)** is the functional area of the placenta where maternal-fetal exchange occurs. At term, the total volume of the intervillous space is approximately **150 ml**. While the total volume of the space is 150 ml, the **maternal blood flow** through this space is significantly higher, estimated at **500–600 ml/minute**. This ensures that the 150 ml of blood is replaced roughly 3 to 4 times every minute, maintaining a steep concentration gradient for the exchange of oxygen, nutrients, and waste products. **Analysis of Incorrect Options:** * **B (250 ml) & C (300 ml):** These values overestimate the anatomical capacity of the intervillous space. While the placenta as a whole weighs about 500g, the actual blood-filled space between the villi is limited to 150 ml. * **D (500 ml):** This value is often confused with the **rate of blood flow per minute** (500–600 ml/min) rather than the static volume of the space itself. **High-Yield Clinical Pearls for NEET-PG:** * **Total Placental Volume:** At term, the placenta contains about **500 ml** of blood (150 ml in the intervillous space and 350 ml in the fetal villous system). * **Uteroplacental Blood Flow:** At term, it accounts for approximately **10–12% of total cardiac output** (roughly 600–700 ml/min). * **Pressure Dynamics:** Maternal blood enters the IVS at a pressure of **70–80 mmHg** and leaves at **8 mmHg**. The pressure within the IVS during uterine relaxation is about **10 mmHg**. * **Surface Area:** The total surface area of the chorionic villi for exchange at term is approximately **10–14 square meters**.

Question 782: Fetal hydrops is most commonly associated with which of the following?

A. Cardiac anomalies. (Correct Answer)
B. Renal anomalies.
C. Gastrointestinal anomalies.
D. Skeletal anomalies.

Explanation: **Explanation:** **Fetal Hydrops** is defined as the abnormal accumulation of fluid in at least two fetal compartments (e.g., ascites, pleural effusion, pericardial effusion, or skin edema). It is categorized into Immune (Rh isoimmunization) and Non-Immune Hydrops Fetal (NIHF). In the post-Rhogam era, **NIHF accounts for nearly 90% of cases.** **Why Cardiac Anomalies are the Correct Answer:** Cardiovascular disorders are the **most common cause of Non-Immune Hydrops Fetalis**, accounting for approximately **20–40% of cases**. The underlying mechanism is usually high-output cardiac failure or increased central venous pressure, leading to fluid extravasation. Common causes include structural defects (e.g., Atrioventricular septal defects, Ebstein anomaly) and arrhythmias (e.g., Supraventricular tachycardia or Congenital heart block). **Why Other Options are Incorrect:** * **Renal anomalies:** These are more typically associated with **Oligohydramnios** (e.g., Potter sequence) rather than hydrops. While some rare tumors (Mesoblastic nephroma) can cause hydrops, they are not the primary cause. * **Gastrointestinal anomalies:** These usually present with **Polyhydramnios** due to impaired swallowing (e.g., Esophageal or Duodenal atresia) rather than systemic fluid accumulation. * **Skeletal anomalies:** Conditions like Achondrogenesis can cause hydrops due to thoracic restriction, but they represent a very small percentage of cases compared to cardiac etiologies. **NEET-PG High-Yield Pearls:** * **Most common cause of NIHF:** Cardiovascular anomalies. * **Most common chromosomal cause:** Turner Syndrome (45,X) – often associated with cystic hygromas. * **Most common infectious cause:** Parvovirus B19 (causes hydrops via severe fetal anemia). * **Mirror Syndrome:** A clinical pearl where maternal edema "mirrors" the fetal hydrops (associated with preeclampsia-like symptoms).

Question 783: Which condition has the highest mortality in pregnancy?

A. Eisenmenger syndrome (Correct Answer)
B. Tetralogy of Fallot
C. Coarctation of the aorta
D. Marfan syndrome

Explanation: **Explanation:** **Eisenmenger Syndrome** carries the highest risk of maternal mortality, ranging from **30% to 50%**. The underlying pathophysiology involves a long-standing left-to-right shunt that leads to irreversible pulmonary hypertension and eventual shunt reversal (right-to-left). During pregnancy, the systemic vascular resistance (SVR) naturally decreases; this exacerbates the right-to-left shunt, leading to profound hypoxemia, heart failure, and sudden death, particularly during labor or the immediate postpartum period. Due to this extreme risk, pregnancy is medically contraindicated in these patients. **Analysis of Incorrect Options:** * **Tetralogy of Fallot (ToF):** While a major cyanotic heart disease, mortality is significantly lower (approx. 2-10%) if the defect was surgically repaired. Unrepaired ToF carries higher risk but does not reach the levels seen in Eisenmenger. * **Coarctation of the Aorta:** Mortality is roughly 3-9%. The primary risks are aortic dissection or rupture and congestive heart failure, but it is generally more manageable than pulmonary hypertension. * **Marfan Syndrome:** Mortality is low (<1%) if the aortic root diameter is <40mm. Risk increases significantly (>10%) only if the aortic root is >40mm or if there is a history of dissection. **High-Yield Clinical Pearls for NEET-PG:** * **Top 3 High-Risk Cardiac Conditions:** 1. Eisenmenger Syndrome (Highest), 2. Pulmonary Arterial Hypertension (PAH), 3. Severe Aortic Stenosis. * **WHO Class IV:** These conditions (including Eisenmenger) are classified as WHO Pregnancy Risk Class IV, where pregnancy is contraindicated and termination should be discussed. * **Timing of Danger:** The most critical period for cardiac patients is the **immediate postpartum (third stage of labor)** due to the sudden "autotransfusion" of blood from the involuting uterus, which can lead to acute heart failure.

Question 784: A 35-year-old multiparous lady at 30 weeks gestation presents with sudden onset painless vaginal bleeding. Ultrasound shows the following:

A. Abruption placenta
B. Placenta previa (Correct Answer)
C. Vasa previa
D. Sub-amniotic cyst

Explanation: ***Placenta previa*** - **Painless vaginal bleeding** at 30 weeks gestation is the classic presentation of placenta previa, where the placenta covers or lies close to the **internal cervical os**. - Ultrasound would show the **placental edge covering the internal os**, confirming the diagnosis and explaining the bleeding mechanism during cervical changes. *Abruption placenta* - Characterized by **painful vaginal bleeding** with **uterine contractions** and tenderness, unlike the painless nature described here. - Ultrasound typically shows a **retroplacental hematoma** or **placental separation**, not placental positioning over the cervical os. *Vasa previa* - Involves **fetal blood vessels** crossing the **internal os** ahead of the presenting part, causing **fetal blood loss** rather than maternal bleeding. - Diagnosed by **color Doppler ultrasound** showing vessels over the cervical os, and would present with **fetal distress** and **sinusoidal fetal heart rate pattern**. *Sub-amniotic cyst* - Represents an **incidental finding** of a small cyst within the **amniotic cavity** that does not cause vaginal bleeding. - This is a **benign condition** with no clinical significance and would not explain the acute presentation of bleeding.

Question 785: Which of the statements is FALSE regarding acute fatty liver of pregnancy?

A. The neonate is at risk of fatty infiltration of liver.
B. More commonly occurs in 3rd trimester.
C. More commonly seen in women with a female fetus. (Correct Answer)
D. May be associated with hyperuricemia.

Explanation: **Explanation:** Acute Fatty Liver of Pregnancy (AFLP) is a rare but life-threatening obstetric emergency characterized by microvesicular steatosis of the liver. **1. Why Option C is the correct (False) statement:** AFLP is actually more commonly associated with a **male fetus**, not a female fetus. While the exact reason is not fully understood, it is a high-yield epidemiological association frequently tested in PG exams. **2. Analysis of other options:** * **Option A (True):** AFLP is strongly linked to a fetal deficiency of the enzyme **Long-Chain 3-Hydroxyacyl-CoA Dehydrogenase (LCHAD)**. If the fetus is homozygous for this deficiency, they cannot oxidize fatty acids, leading to accumulation in the maternal circulation. Postnatally, these neonates are at high risk for hepatic failure, cardiomyopathy, and fatty infiltration of the liver. * **Option B (True):** AFLP typically manifests in the **late third trimester** (usually between 30–38 weeks) or the immediate postpartum period. * **Option C (True):** Hyperuricemia is a common laboratory finding in AFLP, often occurring early due to decreased renal clearance, even before significant elevations in creatinine or transaminases. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Liver biopsy (shows microvesicular fat), but rarely done as diagnosis is usually clinical. * **Clinical Criteria:** **Swansea Criteria** are used for diagnosis (requires ≥6 of 14 clinical/biochemical findings). * **Key Lab Findings:** Hypoglycemia (severe), elevated ammonia, prolonged PT/INR, and hyperbilirubinemia. * **Management:** Immediate stabilization and **expeditious delivery**, regardless of gestational age. It does not recur in subsequent pregnancies unless the LCHAD mutation is present.

Question 786: Which of the following is NOT considered a high-risk pregnancy factor?

A. Previous manual removal of the placenta
B. History of infertility
C. Multiple gestation (e.g., twins)
D. Obesity (Correct Answer)

Explanation: **Explanation:** In the context of standard obstetric risk stratification for the NEET-PG exam, **Obesity (Option D)** is often classified as a "medical complication" or a "risk factor for complications" rather than a standalone "high-risk pregnancy factor" in the same category as previous obstetric disasters or structural abnormalities. While obesity increases the risk of gestational diabetes and preeclampsia, it is frequently used as a distractor in questions where other options represent direct, high-impact obstetric histories or current pathological states. **Why the other options are considered High-Risk:** * **Previous manual removal of the placenta (Option A):** This indicates a history of morbidly adherent placenta or uterine atony. It significantly increases the risk of **Postpartum Hemorrhage (PPH)** and placenta accreta spectrum in subsequent pregnancies. * **History of infertility (Option B):** Pregnancies achieved after long-term infertility (especially via ART) are termed "precious pregnancies." They are associated with higher maternal age, multiple gestations, and increased psychological and physiological monitoring requirements. * **Multiple gestation (Option C):** Twins or triplets are inherently high-risk due to the increased danger of preterm labor, malpresentation, polyhydramnios, and hypertensive disorders. **Clinical Pearls for NEET-PG:** * **High-Risk Criteria:** Always include previous C-sections, grand multiparity, Rh-negative isoimmunization, and maternal age (<18 or >35). * **Manual Removal of Placenta:** If a placenta is not delivered within 30 minutes of the second stage, it is "retained." Previous history is the strongest predictor for recurrence. * **Obesity Management:** While not always the "primary" high-risk factor in MCQ stems, remember that a BMI >30 kg/m² requires screening for GDM at the first prenatal visit.

Question 787: Which of the following findings can be seen during clinical examination of a pregnant female with heart disease compared to a normal pregnancy?

A. Pedal edema
B. Engorged neck veins (Correct Answer)
C. Dyspnea
D. Exercise intolerance

Explanation: In clinical practice, distinguishing between the physiological changes of pregnancy and pathological signs of heart disease is a common challenge. ### **Why "Engorged Neck Veins" is the Correct Answer** In a normal pregnancy, despite an increase in blood volume (up to 50%), the **Jugular Venous Pressure (JVP)** remains normal because the venous system accommodates the extra volume through vasodilation. Therefore, **engorged neck veins (elevated JVP)** or a sustained hepatojugular reflux are always pathological and indicate right-sided heart failure or fluid overload. ### **Why Other Options are Incorrect** * **Pedal Edema (A):** This is a common physiological finding in late pregnancy due to the compression of the inferior vena cava by the gravid uterus and sodium/water retention. It is not specific to heart disease. * **Dyspnea (C):** "Physiological dyspnea" occurs in about 75% of normal pregnancies. It is caused by the hyperventilation effect of **progesterone** (which increases sensitivity to CO2) and the upward displacement of the diaphragm. * **Exercise Intolerance (D):** Normal pregnant women experience a decrease in exercise tolerance due to increased body weight, altered center of gravity, and increased oxygen demand. ### **High-Yield Clinical Pearls for NEET-PG** * **Normal findings in pregnancy that mimic heart disease:** S3 gallop (due to rapid ventricular filling), soft systolic murmur (Grade I/II ejection systolic), and laterally displaced apex beat. * **Definitive signs of Heart Disease in pregnancy:** 1. Diastolic murmur (Always pathological). 2. Continuous murmur (unless it is a mammary souffle). 3. Loud/Harsh Systolic murmur (Grade III or higher). 4. Persistent orthopnea or paroxysmal nocturnal dyspnea (PND). 5. Cardiac arrhythmias or fixed split S2. * **Most common heart disease in pregnancy (India):** Rheumatic Heart Disease (Mitral Stenosis is the most common lesion).

Question 788: Which of the following is not a criterion for antenatal diagnosis of Twin-Twin transfusion syndrome?

A. Oligohydramnios in donor fetus
B. Dichorionicity (Correct Answer)
C. Hemoglobin difference of > 5 g/dL between the two fetuses
D. Weight difference of > 20% between the two fetuses

Explanation: ### Explanation **1. Why Dichorionicity is the Correct Answer:** Twin-Twin Transfusion Syndrome (TTTS) is a complication exclusive to **Monochorionic (MC)** twins. It occurs due to unbalanced blood flow through deep arteriovenous anastomoses in a single shared placenta. In **Dichorionic** twins, each fetus has its own separate placenta; therefore, vascular communications do not exist, making TTTS physiologically impossible. Thus, dichorionicity is an exclusion criterion, not a diagnostic one. **2. Analysis of Incorrect Options:** * **Oligohydramnios in donor fetus (Option A):** This is a hallmark diagnostic criterion. The donor twin suffers from hypovolemia and decreased renal perfusion, leading to oligohydramnios (Maximum Vertical Pocket < 2 cm), while the recipient twin develops polyhydramnios (MVP > 8 cm). * **Hemoglobin difference (Option C):** While modern antenatal diagnosis relies primarily on ultrasound (Quintero stages), a significant hemoglobin discrepancy (> 5 g/dL) is a classic postnatal finding used to confirm the diagnosis of chronic transfusion. * **Weight difference (Option D):** Selective Fetal Growth Restriction (sFGR) often coexists with TTTS. A weight discordance of > 20% is a common clinical feature used to support the diagnosis of unequal nutrient distribution between the twins. **3. High-Yield Clinical Pearls for NEET-PG:** * **Quintero Staging:** Used to grade TTTS severity (Stage I: Poly/Oli; Stage II: Absent bladder in donor; Stage III: Abnormal Dopplers; Stage IV: Hydrops; Stage V: Death). * **Gold Standard Treatment:** Fetoscopic Laser Photocoagulation of placental anastomoses (best performed between 16–26 weeks). * **Stuck Twin Phenomenon:** Refers to the donor twin being "shrink-wrapped" against the uterine wall due to severe oligohydramnios. * **Most Common Type of Twins:** Dizygotic (always Dichorionic). TTTS only occurs in Monozygotic twins that result in a Monochorionic Diamniotic (MCDA) pregnancy.

Question 789: Which of the following is not a feature of HELLP syndrome?

A. Elevated liver enzymes
B. Thrombocytopenia
C. Retroplacental hemorrhage (Correct Answer)
D. Hemolysis

Explanation: **Explanation:** HELLP syndrome is a severe multisystem disorder, typically considered a complication or variant of severe preeclampsia. The diagnosis is strictly biochemical, defined by the acronym itself: * **H: Hemolysis** (Evidence of microangiopathic hemolytic anemia, such as schistocytes on peripheral smear or elevated bilirubin). * **EL: Elevated Liver enzymes** (AST/ALT ≥ 70 U/L). * **LP: Low Platelets** (Thrombocytopenia < 100,000/mm³). **Why Option C is the correct answer:** **Retroplacental hemorrhage** (Abruptio Placentae) is a known **complication** of HELLP syndrome and severe preeclampsia, but it is not a diagnostic **feature** or part of the defining criteria. While it occurs more frequently in these patients due to vascular damage, it is a clinical event rather than a laboratory component of the syndrome. **Analysis of Incorrect Options:** * **A. Elevated liver enzymes:** A core diagnostic feature caused by periportal necrosis and fibrin deposition in the liver sinusoids. * **B. Thrombocytopenia:** A hallmark feature resulting from increased platelet consumption and activation at the site of damaged vascular endothelium. * **D. Hemolysis:** A mandatory feature characterized by the fragmentation of RBCs as they pass through small blood vessels damaged by fibrin deposits. **NEET-PG High-Yield Pearls:** 1. **Mississippi Classification:** Classifies HELLP based on platelet count (Class 1: <50k, Class 2: 50-100k, Class 3: 100-150k). 2. **Most common symptom:** Epigastric or right upper quadrant pain (due to Glisson’s capsule stretch). 3. **Management:** The definitive treatment is delivery. If <34 weeks, steroids (Dexamethasone) are given for fetal lung maturity and to potentially improve maternal platelet counts. 4. **Differential:** Must be distinguished from Acute Fatty Liver of Pregnancy (AFLP), which typically presents with hypoglycemia and deranged coagulation profiles (↑PT/APTT).

Question 790: A 38-year-old woman is in her first pregnancy, which has been uneventful until the 34th week, when she develops swelling of feet and hands. An obstetric check-up reveals that she also has hypertension and proteinuria. Laboratory analysis shows elevated aspartate aminotransferase (AST) and alanine aminotransferase (ALT) and slightly decreased platelets. What is the initial event in the pathogenesis of her condition?

A. Chorioamnionitis
B. Disseminated intravascular coagulation
C. Maternal hypertension
D. Placental ischemia (Correct Answer)

Explanation: ### Explanation **Pathogenesis of Preeclampsia** The clinical presentation of hypertension, proteinuria, edema, elevated liver enzymes, and thrombocytopenia in a primigravida at 34 weeks is diagnostic of **Preeclampsia with severe features** (approaching HELLP syndrome). The "root cause" of preeclampsia is abnormal placentation. In a normal pregnancy, trophoblastic cells invade the maternal spiral arteries, converting them from high-resistance, small-caliber vessels into high-capacitance, low-resistance vessels. In preeclampsia, this **remodeling fails**, leading to narrow spiral arteries and subsequent **placental ischemia**. This ischemic placenta releases anti-angiogenic factors (like sFlt-1 and soluble endoglin) into the maternal circulation, causing widespread endothelial dysfunction, which manifests as hypertension, proteinuria (leaky glomerular capillaries), and multi-organ damage. **Analysis of Incorrect Options:** * **A. Chorioamnionitis:** This is an infection of the fetal membranes/amniotic fluid, typically presenting with fever, uterine tenderness, and fetal tachycardia, not hypertension or proteinuria. * **B. Disseminated Intravascular Coagulation (DIC):** While DIC can be a *complication* of severe preeclampsia or placental abruption, it is a late-stage consumptive coagulopathy, not the initiating event. * **C. Maternal Hypertension:** Hypertension is a *clinical manifestation* of the underlying systemic endothelial damage; it is the result of the pathogenesis, not the initial cause. **Clinical Pearls for NEET-PG:** * **The "Two-Stage" Theory:** Stage 1 is reduced placental perfusion (ischemia); Stage 2 is the maternal systemic inflammatory response. * **Definitive Treatment:** Delivery of the placenta is the only cure, as it removes the source of the ischemic factors. * **Aspirin Prophylaxis:** Low-dose aspirin (75–150 mg) started before 16 weeks is recommended for high-risk patients to improve placentation. * **HELLP Syndrome:** Hemolysis, Elevated Liver enzymes, Low Platelets. It is a subset of severe preeclampsia.

Practice by Chapter

Fetal Assessment Techniques

Practice Questions

Hypertensive Disorders in Pregnancy

Practice Questions

Intrauterine Growth Restriction

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Multiple Gestation

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Rh Isoimmunization and Other Blood Group Incompatibilities

Practice Questions

Intrauterine Fetal Therapy

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Prenatal Diagnosis and Genetic Counseling

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Placental Abnormalities

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Preterm Labor and Delivery

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Management of Medical Disorders in Pregnancy

Practice Questions

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