Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine Indian Medical PG Practice Questions and MCQs

Question 751: Which of the following is true about the amnion, except:

A. It has no lymph supply.
B. It has a rich blood supply. (Correct Answer)
C. It has no nerve supply.
D. It dilates the cervix during labor.

Explanation: The amnion is the innermost fetal membrane, characterized by its tough, thin, and transparent nature. Understanding its histology and function is high-yield for NEET-PG. ### **Explanation of the Correct Answer** **Option B (It has a rich blood supply)** is the correct answer because it is a **false statement**. The amnion is entirely **avascular**. It contains no blood vessels, lymphatics, or nerves. It derives its nutrition and oxygen primarily via diffusion from the amniotic fluid and the underlying vascularized decidua/chorion. ### **Analysis of Other Options** * **Option A (No lymph supply):** This is a true statement. As an avascular structure, it lacks a lymphatic drainage system. * **Option C (No nerve supply):** This is a true statement. The lack of nerve supply explains why procedures like amniocentesis do not cause pain when the needle pierces the amniotic sac (the pain felt is from the maternal abdominal wall and uterus). * **Option D (Dilates the cervix):** This is a true statement. During the first stage of labor, the intact "bag of waters" (amnion and chorion) acts as a hydrostatic wedge. According to **Pascal’s Law**, it transmits intrauterine pressure evenly to the cervix, aiding in effacement and dilatation. ### **High-Yield Clinical Pearls for NEET-PG** * **Structure:** The amnion consists of five layers, the innermost being a single layer of cuboidal/columnar epithelium. * **Tensile Strength:** The amnion provides the majority of the tensile strength of the fetal membranes, largely due to its **Type IV and V collagen** content. * **Amniotic Fluid Production:** Early in pregnancy, the amnion contributes to amniotic fluid production via active transport of solutes. * **Clinical Correlation:** Rupture of membranes (ROM) leads to the loss of the hydrostatic wedge, often resulting in a change in the mechanics of labor.

Question 752: In a case of antepartum hemorrhage with BP = 80/60 mmHg, what is the treatment of choice?

A. Blood transfusion (Correct Answer)
B. Morphine
C. Placentography
D. Panhysterectomy

Explanation: ### Explanation **1. Why Blood Transfusion is the Correct Answer:** The clinical presentation describes a patient with **Antepartum Hemorrhage (APH)** who is hemodynamically unstable (BP 80/60 mmHg indicates **hypovolemic shock**). In any obstetric emergency involving significant blood loss and hypotension, the immediate priority is **resuscitation and stabilization**. Blood transfusion is the definitive treatment to restore intravascular volume, maintain oxygen-carrying capacity, and prevent multi-organ dysfunction or maternal death. In NEET-PG, remember the mantra: *“Resuscitate first, diagnose later.”* **2. Why the Other Options are Incorrect:** * **Morphine (B):** While once used in the "Stallworthy’s regime" for expectant management of placenta previa, it is no longer the treatment of choice. It can cause respiratory depression in both the mother and the fetus and does nothing to address the underlying shock. * **Placentography (C):** This is a diagnostic tool (historical or radiological) used to locate the placenta. In a state of shock (BP 80/60), diagnostic imaging is secondary to life-saving resuscitation. Furthermore, modern ultrasound has replaced traditional placentography. * **Panhysterectomy (D):** This refers to the total removal of the uterus and ovaries. While an emergency hysterectomy may be required in cases of intractable postpartum hemorrhage (e.g., placenta accreta), it is not the immediate first step for APH with hypotension and is too radical as an initial treatment. **3. Clinical Pearls for NEET-PG:** * **Initial Management:** Start two large-bore IV cannulae (14G or 16G) and rapid crystalloid infusion while waiting for cross-matched blood. * **The "Golden Rule":** Never perform a per-vaginal (PV) examination in a case of APH until placenta previa is ruled out by ultrasound, as it may provoke torrential hemorrhage. * **Target:** Maintain a urine output of >30 ml/hr as a sign of adequate renal perfusion during resuscitation.

Question 753: Which of the following antibodies is NOT typically involved in Rh isoimmunization?

A. Anti C
B. Anti E
C. Anti-Lewis (Correct Answer)
D. Anti D

Explanation: **Explanation:** Rh isoimmunization occurs when maternal antibodies cross the placenta and target fetal red blood cell antigens, leading to Hemolytic Disease of the Fetus and Newborn (HDFN). **Why Anti-Lewis is the correct answer:** The Lewis antigens (Le^a and Le^b) are not integral to the red cell membrane; they are plasma glycosphingolipids adsorbed onto the RBC surface. Most importantly, **Anti-Lewis antibodies are typically IgM.** Since IgM antibodies are large pentamers, they **cannot cross the placenta**. Furthermore, Lewis antigens are poorly expressed on fetal erythrocytes. Consequently, Anti-Lewis antibodies do not cause HDFN and are clinically insignificant in Rh isoimmunization. **Analysis of incorrect options:** * **Anti-D (Option D):** This is the most common and clinically significant antibody involved in Rh isoimmunization, occurring in Rh-negative mothers carrying Rh-positive fetuses. * **Anti-C and Anti-E (Options A & B):** These belong to the Rh blood group system (C, c, E, e). While less common than Anti-D, these are **IgG antibodies** that can cross the placenta and cause significant fetal hemolysis. **Clinical Pearls for NEET-PG:** * **"Lewis Lives" (mnemonic):** Lewis antibodies do not "kill" the fetus because they don't cross the placenta. * **Kell Antibodies:** "Kell Kills." Anti-Kell is the second most common cause of severe HDFN; it causes hemolysis AND suppresses fetal erythropoiesis. * **Antibody Titers:** For Anti-D, a critical titer (usually 1:16) indicates a high risk for fetal hydrops and necessitates further fetal surveillance (e.g., MCA-PSV doppler).

Question 754: What is the drug of choice for the prevention of seizures in a patient with severe pre-eclampsia?

A. Phenytoin
B. Magnesium sulphate (Correct Answer)
C. Diazepam
D. Nifedipine

Explanation: **Explanation:** **Magnesium Sulphate (MgSO₄)** is the gold standard and drug of choice for both the **prevention (prophylaxis)** of seizures in severe pre-eclampsia and the **control** of seizures in eclampsia. Its superiority was established by the landmark **MAGPIE trial**, which demonstrated that MgSO₄ reduces the risk of eclampsia by more than 50% compared to placebo. It acts primarily by decreasing acetylcholine release at the neuromuscular junction and causing cerebral vasodilation, thereby lowering cerebral ischemia. **Analysis of Incorrect Options:** * **A. Phenytoin:** While an effective antiepileptic, it is less effective than MgSO₄ in preventing eclamptic seizures and carries a higher risk of maternal toxicity and fetal side effects. * **C. Diazepam:** Formerly used for seizure control, the **Collaborative Eclampsia Trial** proved it is inferior to MgSO₄, as it is associated with higher rates of recurrent seizures and maternal respiratory depression. * **D. Nifedipine:** This is a Calcium Channel Blocker used as an **antihypertensive** to manage blood pressure in pre-eclampsia, but it has no intrinsic anticonvulsant properties. **High-Yield Clinical Pearls for NEET-PG:** * **Regimen:** The **Pritchard Regimen** (IM) and **Zuspan Regimen** (IV) are the standard protocols. * **Therapeutic Window:** 4–7 mEq/L. * **Toxicity Monitoring:** Always check for the presence of **Knee jerk** (lost at 8-10 mEq/L), **Respiratory rate** (>12/min), and **Urine output** (>30ml/hr). * **Antidote:** 10 ml of 10% **Calcium Gluconate** IV (administered over 10 minutes).

Question 755: Which of the following drugs is effective in preventing the vertical transmission of HIV from an infected pregnant mother to her child?

A. Zidovudine (Correct Answer)
B. Lamivudine
C. Didanosine
D. All of the above

Explanation: **Explanation:** The prevention of parent-to-child transmission (PPTCT) of HIV is a critical aspect of maternal-fetal medicine. **Why Zidovudine (AZT) is the correct answer:** Zidovudine, a Nucleoside Reverse Transcriptase Inhibitor (NRTI), was the first drug proven to significantly reduce vertical transmission. According to the landmark **PACTG 076 trial**, a regimen of oral zidovudine during pregnancy, intravenous zidovudine during labor, and oral syrup for the newborn reduced transmission risk by nearly 70%. It remains the "gold standard" component for prophylaxis because it crosses the placenta efficiently and provides pre-exposure prophylaxis to the fetus. **Analysis of other options:** * **Lamivudine (3TC) and Didanosine (ddI):** While these are also NRTIs used in Highly Active Antiretroviral Therapy (HAART) to treat the mother’s infection, they are not typically used as *monotherapy* for the specific purpose of preventing vertical transmission. In modern protocols, they are used in combination with other drugs (like Tenofovir and Efavirenz) to achieve viral suppression, but Zidovudine is the classic answer for the specific drug historically validated for transmission prevention. **High-Yield Clinical Pearls for NEET-PG:** * **WHO/NACO Guidelines:** The current recommendation for all pregnant women with HIV is **Lifelong ART** (Triple drug regimen), regardless of CD4 count. The preferred regimen is **TLE** (Tenofovir + Lamivudine + Efavirenz) or **TLD** (Tenofovir + Lamivudine + Dolutegravir). * **Mode of Delivery:** Elective Cesarean Section (at 38 weeks) is recommended if the viral load is >1000 copies/mL near term. * **Infant Prophylaxis:** Infants born to HIV-positive mothers should receive **Nevirapine** (or Zidovudine) syrup for 6–12 weeks. * **Breastfeeding:** In India, exclusive breastfeeding for 6 months is recommended unless replacement feeding is AFASS (Affordable, Feasible, Acceptable, Sustainable, and Safe).

Question 756: Which of the following types of hepatitis carries the worst prognosis in pregnancy?

A. Hepatitis A
B. Hepatitis B
C. Hepatitis C
D. Hepatitis E (Correct Answer)

Explanation: **Explanation:** The correct answer is **Hepatitis E (Option D)**. While most viral hepatitides follow a clinical course in pregnant women similar to that in non-pregnant individuals, Hepatitis E is a notable and high-yield exception. **1. Why Hepatitis E is the Correct Answer:** Hepatitis E virus (HEV), specifically genotypes 1 and 2, is associated with a significantly higher mortality rate during pregnancy, particularly in the **third trimester**. While the case fatality rate in the general population is <1%, it can soar to **15–25%** in pregnant women. The poor prognosis is attributed to a high risk of **Fulminant Hepatic Failure (FHF)**, disseminated intravascular coagulation (DIC), and obstetric complications like placental abruption. The underlying mechanism is thought to involve pregnancy-related immune modulation and high levels of steroid hormones that enhance viral replication. **2. Why Other Options are Incorrect:** * **Hepatitis A (A):** Generally follows a benign, self-limiting course. It does not cause chronic infection or increased maternal mortality. * **Hepatitis B (B):** While it poses a significant risk for **vertical transmission** (especially if the mother is HBeAg positive), it does not typically increase maternal morbidity or mortality during the acute phase of pregnancy. * **Hepatitis C (C):** Primarily concerns chronic infection and potential vertical transmission; it does not cause acute fulminant liver failure in pregnancy. **Clinical Pearls for NEET-PG:** * **Route of Transmission:** Hepatitis A and E are transmitted via the **fecal-oral route** (waterborne outbreaks). * **Vertical Transmission:** Hepatitis B has the highest risk of vertical transmission (up to 90% without immunoprophylaxis). * **Prophylaxis:** The HEV vaccine is not yet part of routine protocols, making supportive care and clean water the primary preventive measures. * **Key Association:** Always link "Pregnancy + Fulminant Hepatic Failure" to **Hepatitis E** in exam scenarios.

Question 757: Modified Biophysical Profile (BPP) consists of which of the following components?

A. Non-stress test (NST) with amniotic fluid index (AFI) (Correct Answer)
B. Non-stress test (NST) with fetal breathing movements
C. Non-stress test (NST) with fetal movements
D. Non-stress test (NST) with fetal tone

Explanation: The **Modified Biophysical Profile (mBPP)** is a simplified, efficient method of fetal surveillance used to assess fetal well-being in high-risk pregnancies. It combines two specific parameters that reflect both acute and chronic fetal oxygenation. ### **Explanation of the Correct Answer** * **Non-stress Test (NST):** This serves as an indicator of **acute fetal acid-base status**. A reactive NST suggests a functioning fetal central nervous system and the absence of immediate hypoxia. * **Amniotic Fluid Index (AFI):** This serves as an indicator of **chronic placental function**. Since fetal urine output is the primary source of amniotic fluid, a normal AFI (typically >5 cm) suggests adequate long-term placental perfusion. The mBPP is considered "normal" if the NST is reactive and the AFI is >5 cm. It is preferred in busy clinical settings because it is less time-consuming than a full BPP while maintaining a high negative predictive value. ### **Why Other Options are Incorrect** * **Options B, C, and D:** Fetal breathing movements, fetal movements, and fetal tone are components of the **Manning’s Full Biophysical Profile (BPP)**, which includes five parameters (NST + 4 ultrasound components). In a **Modified** BPP, these specific ultrasound markers are bypassed in favor of the AFI alone to represent long-term status. ### **NEET-PG High-Yield Pearls** * **Full BPP Components:** Tone, Movement, Breathing, NST, and Amniotic Fluid (Mnemonic: **"BATMAN"** - Breathing, Amniotic fluid, Tone, Movement, And Nst). * **First sign lost in hypoxia:** Fetal breathing movements (most sensitive). * **Last sign lost in hypoxia:** Fetal tone (indicates severe acidosis). * **AFI vs. SDP:** In a full BPP, the Single Deepest Pocket (SDP) >2 cm is often used; in mBPP, the AFI is the standard measurement.

Question 758: What is the most common cause of fetal ventriculomegaly?

A. Arnold Chiari malformation I
B. Arnold Chiari malformation II
C. Aqueductal stenosis (Correct Answer)
D. Dandy-Walker malformation

Explanation: **Explanation:** **Ventriculomegaly** is defined as an atrial width of the lateral ventricles ≥10 mm. It is a common prenatal ultrasound finding that necessitates a thorough evaluation of the fetal neuroanatomy. **Why Aqueductal Stenosis is the Correct Answer:** **Aqueductal stenosis** is the most common cause of congenital obstructive (non-communicating) hydrocephalus, accounting for approximately **33–43% of cases**. It involves a narrowing or obstruction of the Aqueduct of Sylvius, which connects the third and fourth ventricles. This leads to a characteristic "upstream" dilation of the lateral and third ventricles, while the fourth ventricle remains normal in size. **Analysis of Incorrect Options:** * **Arnold-Chiari Malformation II:** This is a common cause of ventriculomegaly, but it is almost always associated with **neural tube defects** (specifically myelomeningocele). While high-yield, it is statistically less frequent as a primary cause compared to isolated aqueductal stenosis. * **Arnold-Chiari Malformation I:** This involves downward displacement of the cerebellar tonsils. It is rarely diagnosed prenatally and is generally not a common cause of fetal ventriculomegaly. * **Dandy-Walker Malformation:** This involves agenesis/hypoplasia of the cerebellar vermis and cystic dilation of the **fourth ventricle**. While it causes hydrocephalus, it is less common than aqueductal stenosis. **NEET-PG High-Yield Pearls:** * **Normal Atrial Width:** <10 mm. (10–12 mm is mild; 13–15 mm is moderate; >15 mm is severe/frank hydrocephalus). * **The "Dangling Choroid" Sign:** A classic sonographic feature where the choroid plexus falls toward the dependent wall of the dilated lateral ventricle. * **X-linked Hydrocephalus:** The most common heritable form of aqueductal stenosis (HSAS), associated with the *L1CAM* gene mutation and characterized by "thumb adduction."

Question 759: Which is the most sensitive screening test for congenital malformations in diabetic mothers?

A. Maternal serum alpha-fetoprotein (MS AFP)
B. Blood glucose
C. Amniotic fluid alpha-fetoprotein (AFP)
D. Glycosylated hemoglobin (HbA1C) (Correct Answer)

Explanation: **Explanation:** The risk of congenital malformations in infants of diabetic mothers (IDM) is directly proportional to the level of glycemic control during the period of **organogenesis** (the first 8 weeks of gestation). **Why HbA1C is the Correct Answer:** Glycosylated hemoglobin (HbA1C) reflects the average blood glucose levels over the preceding 8–12 weeks. In pre-gestational diabetes, an elevated HbA1C in the first trimester serves as a powerful **predictive marker** for structural anomalies. If HbA1C is >8.5%, the risk of malformations increases significantly (up to 22%), and if >10%, the risk can exceed 50%. Therefore, it is the most sensitive screening tool to assess the risk of "diabetic embryopathy." **Analysis of Incorrect Options:** * **Maternal Serum AFP (MS AFP):** While used to screen for Neural Tube Defects (NTDs), it is less sensitive for the broad spectrum of diabetic malformations and is typically performed later (15–20 weeks). * **Blood Glucose:** A single random or fasting glucose measurement only provides a "snapshot" of control and does not reflect the sustained metabolic environment during the critical window of organogenesis. * **Amniotic Fluid AFP:** This is an invasive diagnostic test used primarily to confirm NTDs after an abnormal screening; it is not a primary screening tool for general malformations. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Malformation:** Cardiac anomalies (specifically **Ventricular Septal Defect**). * **Most Specific Malformation:** **Caudal Regression Syndrome** (Sacral agenesis), though rare, is highly characteristic of maternal diabetes. * **Target HbA1C:** For women planning pregnancy, the goal is to achieve an HbA1C **<6.5%** to minimize the risk of anomalies. * **Note:** Gestational Diabetes Mellitus (GDM) usually develops after organogenesis; therefore, it is typically *not* associated with an increased risk of congenital malformations, unlike pre-gestational diabetes.

Question 760: Which of the following is classified as a high-risk pregnancy?

A. Elderly primigravida
B. History of eclampsia
C. Molar pregnancy
D. All the above (Correct Answer)

Explanation: **Explanation:** A high-risk pregnancy is one where the mother, the fetus, or the newborn is at an increased risk of adverse health outcomes due to pre-existing conditions or complications arising during pregnancy. **Why "All the above" is correct:** 1. **Elderly Primigravida (Option A):** Defined as a woman over **35 years** of age pregnant for the first time. These pregnancies are high-risk due to an increased incidence of chromosomal abnormalities (e.g., Down Syndrome), gestational diabetes, pre-eclampsia, and a higher likelihood of operative interventions (Cesarean section). 2. **History of Eclampsia (Option B):** A previous history of eclampsia or severe pre-eclampsia significantly increases the risk of recurrence in subsequent pregnancies. It necessitates close monitoring for hypertension, proteinuria, and placental insufficiency (IUGR). 3. **Molar Pregnancy (Option C):** Gestational Trophoblastic Disease (GTD) is inherently high-risk. It carries risks of severe hemorrhage, hyperemesis gravidarum, early-onset pre-eclampsia, and the potential for malignant transformation into choriocarcinoma. **Clinical Pearls for NEET-PG:** * **Definition of Elderly Primigravida:** Age >35 years. Conversely, a **"Teenage Pregnancy"** (<19 years) is also classified as high-risk due to risks of anemia, CPD, and pre-eclampsia. * **Grand Multipara:** A woman who has had 5 or more previous deliveries is high-risk due to risks of malpresentation, postpartum hemorrhage (PPH), and placenta previa. * **Short Stature:** A primigravida with a height **<140-145 cm** is at high risk for Cephalopelvic Disproportion (CPD). * **Medical Comorbidities:** Any pregnancy complicated by Heart Disease (the most common non-obstetric cause of maternal death), Diabetes, or Anemia (Hb <7g/dL) is automatically high-risk.

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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