Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine Indian Medical PG Practice Questions and MCQs

Question 481: What is the most common cause of epilepsy in pregnancy?

A. Tuberculous meningitis
B. Cerebral malaria
C. Brain tumor
D. Idiopathic (Correct Answer)

Explanation: **Explanation:** **1. Why Idiopathic is Correct:** In the vast majority of pregnant women with epilepsy, the condition is pre-existing and **idiopathic** (primary generalized or focal epilepsy without a clear structural cause). Approximately 0.5–1% of all pregnant women have epilepsy, and in most cases, no specific underlying lesion or systemic disease is identified. It remains the most common diagnosis because epilepsy is typically a chronic neurological disorder that precedes pregnancy rather than a condition acutely triggered by it. **2. Why Other Options are Incorrect:** * **Tuberculous Meningitis & Cerebral Malaria:** While these are significant causes of seizures in specific endemic regions (like India), they are acute infectious etiologies. They present with systemic symptoms (fever, altered sensorium) and are far less common than chronic idiopathic epilepsy in the general obstetric population. * **Brain Tumor:** While a structural cause for new-onset seizures, intracranial neoplasms are rare during the reproductive age group compared to the prevalence of idiopathic epilepsy. **3. Clinical Pearls for NEET-PG:** * **Most common cause of seizures in pregnancy:** Eclampsia (must be distinguished from epilepsy; eclampsia occurs after 20 weeks with hypertension/proteinuria). * **Effect of pregnancy on epilepsy:** Frequency of seizures remains unchanged in 50%, increases in 30% (often due to non-compliance or sleep deprivation), and decreases in 20%. * **Drug of Choice:** **Levetiracetam** or **Lamotrigine** are preferred due to lower teratogenic potential. **Valproate** is highly contraindicated (highest risk of neural tube defects and cognitive impairment). * **Management:** All women on Anti-Epileptic Drugs (AEDs) should receive **5 mg of Folic Acid** daily pre-conceptionally to reduce the risk of NTDs. * **Vitamin K:** Prophylactic Vitamin K (10 mg) is often given to the mother in the last month of pregnancy if she is on enzyme-inducing AEDs to prevent neonatal hemorrhagic disease.

Question 482: "Tule neck sign" is associated with which of the following conditions?

A. Anencephaly
B. Extended breech
C. Shoulder dystocia (Correct Answer)
D. Congenital goiter

Explanation: **Explanation:** The **"Turtle Neck Sign"** is a pathognomonic clinical sign of **Shoulder Dystocia**. It occurs when the fetal head is delivered but immediately retracts against the maternal perineum. This happens because the fetal shoulders are impacted behind the maternal symphysis pubis (or less commonly, the sacral promontory), preventing the rest of the body from following the head. This creates a visual appearance similar to a turtle pulling its head back into its shell. **Analysis of Options:** * **Shoulder Dystocia (Correct):** The sign indicates an obstetric emergency where the head-to-body delivery interval exceeds 60 seconds or requires ancillary maneuvers. * **Anencephaly:** Characterized by the "Frog-like appearance" due to the absence of the cranial vault and bulging eyes, not a retraction of the neck. * **Extended Breech (Frank Breech):** Associated with the "Star-gazer fetus" (hyperextension of the fetal head) in some cases, but not the turtle sign. * **Congenital Goiter:** May cause hyperextension of the fetal neck (deflexed head), leading to face or brow presentation, but does not cause the retraction seen in dystocia. **High-Yield Clinical Pearls for NEET-PG:** * **First Step in Management:** Call for help and perform the **McRoberts Maneuver** (hyperflexion of maternal thighs) + **Suprapubic pressure**. * **Contraindication:** Never apply fundal pressure, as it further impacts the shoulder. * **Zavanelli Maneuver:** Cephalic replacement (pushing the head back) followed by C-section; used as a last resort. * **Risk Factors:** Maternal obesity, gestational diabetes (macrosomia), and prolonged second stage of labor.

Question 483: Rh incompatibility does not produce serious complications in the first pregnancy. Which of the following explains this phenomenon?

A. Antibodies are not able to cross the placenta. (Correct Answer)
B. Antibody titer is very low during secondary immune response.
C. IgG generated is ineffective against fetal red cells.
D. Massive hemolysis is compensated by increased erythropoiesis.

Explanation: ### Explanation **1. Why Option A is Correct:** The primary immune response to Rh-D antigen exposure (usually during delivery of the first Rh-positive child) results in the production of **IgM antibodies**. IgM is a pentameric molecule with a high molecular weight, making it **too large to cross the placental barrier**. Therefore, the fetus in the first pregnancy remains unaffected. In subsequent pregnancies, the secondary immune response produces **IgG antibodies**, which are monomers and can easily cross the placenta, leading to Hemolytic Disease of the Fetus and Newborn (HDFN). **2. Why the Other Options are Incorrect:** * **Option B:** In the first pregnancy, we are dealing with a **primary immune response**, not a secondary one. The secondary response occurs in subsequent pregnancies and is characterized by a rapid, high-titer IgG production. * **Option C:** IgG is actually highly effective against fetal red cells; however, it is typically not produced in significant quantities until the mother is "sensitized" after the first pregnancy. * **Option D:** While the fetus does increase erythropoiesis (extramedullary) to compensate for hemolysis, this occurs in **subsequent** pregnancies. In the first pregnancy, there is no significant hemolysis to begin with because IgM cannot reach the fetal circulation. **3. High-Yield Clinical Pearls for NEET-PG:** * **Sensitizing Events:** Fetomaternal hemorrhage (FMH) most commonly occurs during **delivery** (third stage of labor), but can also occur during abortion, ectopic pregnancy, or invasive procedures like amniocentesis. * **The "Grandmother Theory":** Rarely, an Rh-negative female infant may be sensitized at her own birth by her Rh-positive mother’s blood. * **Prophylaxis:** Anti-D gamma globulin (300 mcg) is administered to Rh-negative unsensitized mothers at **28 weeks** gestation and within **72 hours of delivery** of an Rh-positive infant. * **Kleihauer-Betke Test:** Used to quantify the volume of fetomaternal hemorrhage to determine the required dose of Anti-D.

Question 484: Which type of eclampsia is most common?

A. Antepartum (Correct Answer)
B. Postpartum
C. Intrapartum
D. Imminent

Explanation: **Explanation:** Eclampsia is defined as the occurrence of generalized tonic-clonic seizures in a woman with pre-eclampsia that cannot be attributed to other causes. It is a critical obstetric emergency categorized based on the timing of the seizure relative to delivery. **1. Why Antepartum is Correct:** **Antepartum eclampsia** (seizures occurring before the onset of labor) is the most common clinical presentation, accounting for approximately **50% to 70%** of all cases. This is because the physiological stress of pregnancy and the peak of placental dysfunction—which drives the pathogenesis of pre-eclampsia—are most pronounced in the third trimester prior to delivery. **2. Analysis of Incorrect Options:** * **Postpartum (B):** Seizures occur after delivery (usually within 48 hours). While significant, it accounts for about **10% to 25%** of cases. Late postpartum eclampsia can occur up to 6 weeks after delivery. * **Intrapartum (C):** Seizures occur during labor. This accounts for approximately **20% to 25%** of cases. * **Imminent (D):** This is not a "type" of eclampsia based on timing, but rather a clinical state (Imminent Eclampsia) where a patient with severe pre-eclampsia shows warning signs like headache, blurring of vision, and epigastric pain, suggesting a seizure is about to occur. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Magnesium Sulfate ($MgSO_4$) is the gold standard for both controlling and preventing seizures (Pritchard Regimen). * **Antidote for $MgSO_4$:** Calcium Gluconate (10 ml of 10% solution IV). * **Definitive Treatment:** Delivery of the fetus and placenta is the only definitive cure for eclampsia, regardless of gestational age, once the mother is stabilized. * **Statistically:** If a question asks for the most common time for a seizure, **Antepartum** is the highest frequency.

Question 485: Which of the following signs is observed in intrauterine fetal demise?

A. Von Braun-Fernwalds sign
B. Roberts sign (Correct Answer)
C. Goodell's sign
D. Osiander's sign

Explanation: **Explanation:** **Robert’s Sign** is a classic radiological finding in **Intrauterine Fetal Demise (IUFD)**. It refers to the presence of gas (usually nitrogen) in the fetal heart and large blood vessels (like the aorta). This occurs due to the decomposition of fetal blood and is typically visible on an X-ray or ultrasound within 12 to 24 hours after fetal death. It is often the earliest radiological sign of IUFD. **Analysis of Incorrect Options:** * **Von Braun-Fernwald’s Sign:** This is a sign of **early pregnancy** (around 5–8 weeks) characterized by an irregular softening and enlargement of the uterine fundus at the site of implantation. * **Goodell’s Sign:** This refers to the **softening of the cervix**, a clinical sign of pregnancy usually detectable by the 6th week of gestation. * **Osiander’s Sign:** This is the feeling of **increased pulsations** in the lateral vaginal fornices due to increased vascularity of the uterus during early pregnancy (around 8 weeks). **High-Yield Clinical Pearls for NEET-PG:** * **Spalding’s Sign:** Another crucial sign of IUFD; it refers to the **overlapping of fetal skull bones** due to the liquefaction of the brain and loss of alignment. It usually appears 4–7 days after death. * **Deuel’s Halo Sign:** An X-ray finding in IUFD where an edematous scalp separates from the skull, creating a "halo" appearance. * **Confirmatory Test:** While these radiological signs are historically important, the **gold standard** for diagnosing IUFD today is the **absence of fetal cardiac activity on Real-Time Ultrasonography.**

Question 486: All the following are used in hypertensive emergencies in preeclampsia except?

A. Nifedipine
B. Methyldopa (Correct Answer)
C. Labetalol
D. Hydralazine

Explanation: In a hypertensive emergency during pregnancy (defined as BP ≥160/110 mmHg), the goal is to rapidly lower blood pressure to prevent maternal stroke and encephalopathy. **Why Methyldopa is the correct answer (the "Except"):** Methyldopa is a centrally acting alpha-2 agonist. While it is the **drug of choice for chronic hypertension** in pregnancy, it is **not used in emergencies**. This is because it has a slow onset of action (4–6 hours) and a peak effect that takes up to 24 hours. In an acute crisis, drugs with a rapid onset (minutes) are required. **Explanation of incorrect options (Drugs used in emergencies):** * **Labetalol (IV):** A combined alpha and beta-blocker. It is often the first-line agent due to its rapid onset (5–10 mins) and favorable safety profile. * **Hydralazine (IV):** A direct vasodilator. It was traditionally the gold standard for acute hypertensive crisis in pregnancy. It is effective but may cause reflex tachycardia and headache. * **Nifedipine (Oral):** A calcium channel blocker (short-acting/immediate-release). It is highly effective, easy to administer orally, and has a rapid onset (10–20 mins). **High-Yield Clinical Pearls for NEET-PG:** 1. **Drug of Choice (DOC) for Chronic HTN in pregnancy:** Methyldopa. 2. **DOC for Hypertensive Emergency in pregnancy:** IV Labetalol (per ACOG/FOGSI). 3. **DOC for Eclampsia (Seizures):** Magnesium Sulfate ($MgSO_4$) – *Note: $MgSO_4$ is an anticonvulsant, not an antihypertensive.* 4. **Contraindicated Antihypertensives:** ACE inhibitors and ARBs (due to fetal renal dysgenesis and oligohydramnios) and Sodium Nitroprusside (risk of fetal cyanide poisoning, used only as a last resort).

Question 487: What is the best investigation to diagnose ectopic pregnancy?

A. Urine pregnancy test
B. Laparoscopy (Correct Answer)
C. Ultrasound (USG)
D. Hysteroscopy

Explanation: **Explanation:** The diagnosis of ectopic pregnancy relies on a combination of clinical, biochemical, and radiological findings. However, **Laparoscopy** remains the **Gold Standard** and the best investigation for a definitive diagnosis. 1. **Why Laparoscopy is Correct:** Laparoscopy allows for direct visualization of the fallopian tubes, ovaries, and pelvic cavity. It provides a definitive diagnosis by confirming the presence of a gestational sac outside the uterine cavity and simultaneously offers the opportunity for immediate surgical management (e.g., salpingectomy or salpingostomy). 2. **Why other options are incorrect:** * **Urine Pregnancy Test:** This is a screening tool used to confirm pregnancy (by detecting hCG) but cannot differentiate between an intrauterine and an ectopic pregnancy. * **Ultrasound (USG):** Transvaginal Sonography (TVS) is the **investigation of choice** (first-line) and the most common way to diagnose ectopic pregnancy non-invasively. However, it may sometimes yield indeterminate results (e.g., Pregnancy of Unknown Location), making it less definitive than direct visualization via laparoscopy. * **Hysteroscopy:** This involves visualizing the *inside* of the uterine cavity. While it can confirm the absence of an intrauterine pregnancy, it cannot visualize the adnexa where most ectopic pregnancies occur. **Clinical Pearls for NEET-PG:** * **Gold Standard/Best Investigation:** Laparoscopy. * **Investigation of Choice (First-line):** Transvaginal Ultrasound (TVS). * **Classic Triad:** Amenorrhea, abdominal pain, and vaginal bleeding (present in only 50% of cases). * **Discriminatory Zone:** The level of serum β-hCG (usually 1500–2000 mIU/mL) at which a normal intrauterine pregnancy should be visible on TVS. If hCG is above this level and the uterus is empty, ectopic pregnancy is highly suspected. * **Most common site:** Ampulla of the Fallopian tube.

Question 488: The theorized function of the Hyl anastomosis is equalization of which of the following pressure gradients?

A. Oxygen diffusion across villi
B. Osmotic gradient across fetal membranes
C. Pressure gradient between spiral arteries
D. Pressure gradient between umbilical arteries (Correct Answer)

Explanation: **Explanation:** The **Hyrtl anastomosis** (often referred to as the Hyl anastomosis in some texts) is a unique vascular shunt located on the fetal surface of the placenta, typically within 1–2 cm of the umbilical cord insertion. It represents a transverse connection between the two umbilical arteries. **Why the correct answer is right:** The primary physiological function of the Hyrtl anastomosis is to act as a **pressure-equalizing valve** between the two umbilical arteries. This ensures that blood flow is distributed evenly to all lobes of the placenta, even if one umbilical artery is partially compressed or if there is asymmetrical resistance in the placental vascular beds. It prevents "backflow" and maintains a stable hemodynamic environment for fetal-maternal exchange. **Analysis of Incorrect Options:** * **Option A:** Oxygen diffusion occurs at the level of the terminal villi in the intervillous space, governed by Fick’s law, not by macro-vascular shunts like the Hyrtl anastomosis. * **Option B:** Osmotic gradients across membranes regulate amniotic fluid volume and electrolyte balance; they are unrelated to the arterial shunts of the umbilical cord. * **Option C:** Spiral arteries are maternal vessels located in the decidua basalis. The Hyrtl anastomosis is a fetal structure located on the chorionic plate. **Clinical Pearls for NEET-PG:** * **Location:** It is the only connection between the two umbilical arteries before they branch into the chorionic villi. * **Safety Mechanism:** In cases of a **Single Umbilical Artery (SUA)**, this anastomosis is absent, which is associated with an increased risk of IUGR and congenital anomalies. * **Flow Direction:** Blood usually flows from the artery with higher pressure to the one with lower pressure, ensuring the entire placenta is perfused even during uterine contractions.

Question 489: Which of the following is NOT an unequivocal evidence of heart disease in pregnancy?

A. Systolic murmur (Correct Answer)
B. Diastolic murmur
C. Diastolic thrill and murmur
D. Systolic thrill and murmur

Explanation: **Explanation:** In pregnancy, physiological changes such as increased blood volume, decreased blood viscosity, and a hyperdynamic circulation often lead to the development of **functional (innocent) murmurs**. **1. Why Systolic Murmur is the Correct Answer:** A **systolic murmur** (specifically a soft, mid-systolic ejection murmur) is found in up to 90% of healthy pregnant women. It is caused by increased flow across the pulmonary and aortic valves. Because it is a common physiological finding, it is **not** unequivocal evidence of organic heart disease. **2. Why the other options are wrong (Evidence of Organic Disease):** * **Diastolic Murmur (Option B):** Diastolic murmurs are **always pathological** in pregnancy. They usually indicate underlying conditions like Mitral Stenosis (the most common rheumatic heart lesion in pregnancy) or Aortic Regurgitation. * **Diastolic/Systolic Thrills (Options C & D):** The presence of a **thrill** (a palpable murmur) signifies a high-grade turbulence that is never physiological. A systolic thrill usually indicates severe valvular stenosis or a Ventricular Septal Defect (VSD). **High-Yield Clinical Pearls for NEET-PG:** * **Burwell’s Criteria:** Organic heart disease is diagnosed if any of the following are present: 1. Diastolic, presystolic, or continuous murmur. 2. Cardiac enlargement (clinically or via X-ray). 3. Loud systolic murmur associated with a **thrill**. 4. Severe arrhythmia (e.g., Atrial Fibrillation). * **Most common heart disease in pregnancy (India):** Rheumatic Heart Disease (Mitral Stenosis is the most common lesion). * **Most common congenital heart disease:** ASD (Atrial Septal Defect). * **Dangerous Period:** The risk of heart failure is highest at **28–32 weeks** (peak blood volume), during **labor**, and immediately **postpartum** (due to autotransfusion from the uterus).

Question 490: A 38-year-old woman, gravida 5, para 4, at 10 weeks gestation presents with a urine culture growing >100,000 CFU/mL of Escherichia coli. She is asymptomatic. What is the best next step in her management?

A. Amoxicillin-clavulanate (Correct Answer)
B. Ciprofloxacin
C. No additional treatment or workup indicated
D. Trimethoprim-sulfamethoxazole

Explanation: **Explanation:** The patient presents with **Asymptomatic Bacteriuria (ASB)**, defined as the presence of >10^5 CFU/mL of a single uropathogen in a midstream clean-catch urine specimen from an individual without symptoms of a urinary tract infection. **1. Why Amoxicillin-clavulanate is correct:** In pregnancy, ASB must always be treated because physiological changes (ureteral dilation, decreased bladder tone) increase the risk of progression to **acute pyelonephritis** (up to 30-40% if untreated). Pyelonephritis is associated with severe maternal and fetal complications, including preterm labor, low birth weight, and maternal sepsis. **Amoxicillin-clavulanate** is a safe and effective first-line agent in the first trimester. Other common options include Nitrofurantoin (avoid near term) and Fosfomycin. **2. Why the other options are incorrect:** * **Ciprofloxacin:** Fluoroquinolones are generally avoided in pregnancy due to potential risks of fetal **cartilage toxicity** and arthropathy. * **No additional treatment:** This is the standard for non-pregnant patients with ASB. However, in pregnancy, the high risk of progression to pyelonephritis makes screening and treatment mandatory. * **Trimethoprim-sulfamethoxazole:** This is typically avoided in the **first trimester** (due to trimethoprim’s anti-folate effect and risk of neural tube defects) and the **third trimester** (due to sulfonamides' risk of neonatal kernicterus). **Clinical Pearls for NEET-PG:** * **Screening:** All pregnant women should be screened for ASB at **12–16 weeks** (or the first prenatal visit) using a urine culture. * **Follow-up:** A repeat urine culture is mandatory 1–2 weeks after completing treatment to ensure eradication (test of cure). * **Most common organism:** *Escherichia coli* (80% of cases). * **Complication:** Untreated ASB is the most common cause of preventable preterm labor.

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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