Maternal-Fetal Medicine Practice Questions

Q: A young lady presents with acute abdominal pain and a history of 1.5 months of amenorrhea. Ultrasonography reveals a collection of fluid in the pouch of Douglas and an empty uterine cavity. What is the most likely diagnosis?

Ectopic pregnancy. ### Explanation The clinical presentation of **acute abdominal pain** following a period of **amenorrhea** (1.5 months/6 weeks) is a classic triad for **Ectopic Pregnancy** until proven otherwise. **1. Why Ectopic Pregnancy is the correct answer:** The key diagnostic findings here are an **empty uterine cavity** on ultrasound despite a history of amenorrhea, combined with **fluid in the Pouch of Douglas (POD)**. In the context of a suspected pregnancy, fluid in the POD usually represents **hemoperitoneum** resulting from a ruptured or leaking tubal pregnancy. The "empty uterus" sign is crucial; if the β-hCG levels are above the discriminatory zone (usually 1500–2000 mIU/ml) and the uterus is empty, the diagnosis of ectopic pregnancy is highly probable. **2. Why other options are incorrect:** * **Pelvic Hematocele:** While a hematocele (a collection of blood) is often a *sequela* of a ruptured ectopic pregnancy, it is a clinical finding rather than the primary diagnosis. * **Threatened Abortion:** In this condition, the pregnancy is intrauterine. Ultrasound would show a gestational sac within the uterine cavity, not an empty uterus. * **Twisted Ovarian Cyst:** While this causes acute pain, it is usually not associated with amenorrhea. Ultrasound would typically show a cystic adnexal mass with compromised blood flow rather than an empty uterus with free fluid. ### Clinical Pearls for NEET-PG: * **Classic Triad:** Amenorrhea, abdominal pain, and vaginal bleeding (seen in only 50% of cases). * **Most common site:** Ampulla of the Fallopian tube. * **Gold Standard Diagnosis:** Laparoscopy (though TVS + Serial β-hCG is the standard initial approach). * **Arias-Stella Reaction:** Hypersecretory endometrium seen on histology, characteristic of ectopic pregnancy. * **Pseudosac:** A fluid collection in the midline of the uterus (unlike an eccentric true gestational sac) seen in 10-20% of ectopic cases.

Q: In anencephaly, polyhydramnios is seen due to all of the following EXCEPT?

Uteroplacental insufficiency. Explanation: In anencephaly, polyhydramnios occurs due to an imbalance between amniotic fluid production and its removal. **Uteroplacental insufficiency** is the correct answer because it is actually associated with **oligohydramnios**, not polyhydramnios [3]. Reduced placental perfusion leads to decreased fetal renal blood flow, resulting in diminished fetal urine output. **Why the other options cause Polyhydramnios in Anencephaly:** * **Absence of swallowing (Option B):** This is the primary cause. The defect in the neural tube often involves the swallowing centers in the brainstem and mechanical defects in the oropharynx, preventing the fetus from recycling amniotic fluid. * **Transudation of CSF (Option A):** In anencephaly, the exposed neural tissue and meninges lack a bony covering (cranium). This allows for the direct transudation of cerebrospinal fluid and other fluids into the amniotic sac, increasing the volume. * **Absent fetal pituitary (Option C):** The absence of the fetal pituitary gland leads to a lack of Antidiuretic Hormone (ADH) [1]. This results in fetal "diabetes insipidus," where the kidneys produce excessive amounts of dilute urine, further contributing to polyhydramnios. **High-Yield Clinical Pearls for NEET-PG:** * **Alpha-Fetoprotein (AFP):** Markedly elevated in maternal serum and amniotic fluid in anencephaly (Open Neural Tube Defect) [1, 3]. * **"Frog-like" appearance:** A classic description of the anencephalic fetus on ultrasound due to prominent orbits and absent calvarium [1]. * **Face Presentation:** Anencephaly is a common cause of face presentation during labor. * **Post-term Pregnancy:** Anencephaly can lead to prolonged pregnancy due to the absence of the fetal hypothalamus-pituitary-adrenal axis, which is essential for the initiation of labor [1].

Q: Which of the following is a contraindication for MgSO4, except?

Imminent eclampsia. **Explanation:** Magnesium Sulfate ($MgSO_4$) is the drug of choice for both the prophylaxis and treatment of seizures in Eclampsia and Severe Pre-eclampsia. **Why "Imminent Eclampsia" is the correct answer:** Imminent eclampsia (characterized by severe hypertension, headache, blurring of vision, and epigastric pain) is an **indication**, not a contraindication, for $MgSO_4$ therapy. It is administered to prevent the onset of tonic-clonic seizures. **Analysis of Contraindications (Incorrect Options):** * **Myasthenia Gravis:** $MgSO_4$ inhibits the release of acetylcholine at the neuromuscular junction. In patients with Myasthenia Gravis, this can precipitate a severe neuromuscular blockade and trigger a life-threatening myasthenic crisis. * **Renal Failure:** Magnesium is excreted almost exclusively by the kidneys. In renal failure (Oliguria 1.1 mg/dL), magnesium accumulates rapidly, leading to toxicity. While not an absolute contraindication, it requires extreme caution or dose reduction. * **Hypocalcemia:** Magnesium is a calcium channel antagonist. Administering $MgSO_4$ in a hypocalcemic state can worsen symptoms and potentially lead to cardiac conduction defects. **High-Yield Clinical Pearls for NEET-PG:** * **Therapeutic Range:** 4–7 mEq/L. * **Monitoring Parameters:** Patellar reflex (first to disappear at 8–10 mEq/L), Respiratory rate (>12/min), and Urine output (>30 ml/hr). * **Antidote:** 10 ml of 10% **Calcium Gluconate** IV (administered slowly over 10 minutes). * **Mechanism:** It acts as a CNS depressant and a vasodilator, primarily by blocking NMDA receptors.

Q: Intrauterine growth restriction (IUGR) is caused by all of the following except?

Diabetes. **Explanation:** The correct answer is **Diabetes (Option A)**. In the context of pregnancy, maternal diabetes (specifically pre-gestational or gestational diabetes) is classically associated with **fetal macrosomia** (birth weight >4000g or >90th percentile) rather than growth restriction. This occurs because maternal hyperglycemia leads to fetal hyperglycemia, which stimulates the fetal pancreas to secrete excess insulin. Since insulin is a potent anabolic growth factor, it results in excessive fetal growth and fat deposition. *Note: The only exception is long-standing diabetes with advanced vascular complications (White’s Class F or R), which can cause placental insufficiency and lead to IUGR. However, as a general rule for NEET-PG, diabetes is the "odd one out" as it primarily causes large-for-gestational-age (LGA) babies.* **Why other options are incorrect:** * **Alcohol (Option B):** Alcohol is a known teratogen and a leading cause of symmetric IUGR. It interferes with cell division and protein synthesis. * **Smoking (Option C):** Nicotine and carbon monoxide cause vasoconstriction and reduce the oxygen-carrying capacity of fetal blood, leading to placental insufficiency and asymmetric IUGR. * **Chronic Renal Failure (Option D):** Maternal chronic disease leads to systemic hypertension and impaired uteroplacental blood flow, which are major risk factors for growth restriction. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of IUGR:** Placental insufficiency (often due to maternal hypertension). * **Symmetric IUGR:** Occurs early in pregnancy (e.g., chromosomal anomalies, TORCH infections). * **Asymmetric IUGR:** Occurs later in pregnancy; "Head sparing" effect is seen (e.g., Preeclampsia, Smoking). * **Ponderal Index:** Used to differentiate between symmetric and asymmetric IUGR.

Q: What is the primary benefit of using steroids in the treatment of HELLP syndrome?

Increase platelet count in severe thrombocytopenia.. **Explanation:** The primary clinical benefit of administering corticosteroids (such as Dexamethasone) in HELLP syndrome is the **transient increase in maternal platelet count**. While steroids do not cure the underlying pathophysiology of HELLP, they stabilize endothelial membranes and reduce the inflammatory response, which helps in elevating the platelet count. This is particularly crucial for patients with severe thrombocytopenia (<50,000/µL) to facilitate safer anesthesia (e.g., regional anesthesia) and reduce the risk of surgical site bleeding during delivery. **Analysis of Options:** * **Option A & B:** Large-scale randomized controlled trials (such as the COPE trial) and Cochrane reviews have demonstrated that steroids **do not** significantly reduce maternal mortality, the incidence of acute renal failure, or the need for blood transfusions. * **Option D:** While some studies show a slight improvement in laboratory parameters, the effect on liver enzyme recovery is inconsistent and not considered the "primary" clinical benefit compared to the stabilization of platelets for delivery management. **High-Yield NEET-PG Pearls:** * **Drug of Choice:** Dexamethasone (10 mg IV every 12 hours) is preferred over Betamethasone because it has a more potent effect on increasing platelet counts. * **Definitive Treatment:** The only definitive treatment for HELLP syndrome is **delivery** (usually after 34 weeks or if maternal/fetal condition deteriorates). * **Mississippi Classification:** Class 1 HELLP (Platelets ≤ 50,000/µL) is the most severe form and the primary indication for considering steroid therapy to "buy time" for delivery preparation. * **Postpartum:** Steroids may also be used postpartum to accelerate the recovery of platelet counts in refractory cases.

Q: A 24-week pregnant female has developed gestational diabetes. Which of the following congenital anomalies is MOST characteristic of diabetic pregnancy?

Caudal regression syndrome. **Explanation:** **Why Caudal Regression Syndrome is the Correct Answer:** While the most common congenital malformations in infants of diabetic mothers (IDM) are **cardiac defects** (specifically Ventricular Septal Defects), **Caudal Regression Syndrome** (Sacral Agenesis) is the **most characteristic** or specific anomaly. This condition involves the incomplete development of the lower spine and sacrum, often associated with lower limb deformities and bowel/bladder dysfunction. Its incidence is nearly 200 times higher in diabetic pregnancies compared to the general population, making it a pathognomonic marker for pre-gestational diabetes. **Analysis of Incorrect Options:** * **A. Multicystic kidneys:** While renal anomalies (like renal agenesis or hydronephrosis) can occur in IDM, they are not as specific or characteristic as caudal regression. * **B. Esophageal atresia:** Gastrointestinal anomalies are increased in diabetic pregnancies, but esophageal atresia is less frequently associated with diabetes than cardiac or skeletal defects. * **D. Duodenal atresia:** This is most classically associated with **Down Syndrome (Trisomy 21)**, not maternal diabetes. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Anomaly:** Cardiac defects (VSD is #1; Transposition of Great Arteries is also highly associated). * **Most Specific Anomaly:** Caudal Regression Syndrome. * **Critical Period:** These anomalies occur during **organogenesis** (first 8 weeks), meaning they are associated with pre-gestational diabetes or poorly controlled blood sugar at conception, rather than gestational diabetes developing in the second trimester. * **Neural Tube Defects:** There is a 10-fold increased risk of NTDs in diabetic pregnancies.

Q: Which of the following is NOT true about vasa previa?

Mortality rate of 20% with undiagnosed cases. **Explanation:** **Vasa Previa** is a critical obstetric emergency where fetal vessels run through the membranes, unprotected by Wharton’s jelly or placental tissue, across the internal os. **Why Option B is the Correct Answer (The False Statement):** The mortality rate for **undiagnosed** vasa previa is significantly higher than 20%; it is estimated to be between **50% and 95%**. Because the blood loss is entirely fetal, even a small amount of bleeding (e.g., 100ml) can lead to rapid fetal exsanguination and death. The 20% figure is inaccurate as it underestimates the lethal nature of this condition when not managed prenatally. **Analysis of Other Options:** * **Option A:** The incidence is approximately **1:1500 to 1:2500** deliveries, making it a rare but high-stakes condition. * **Option C:** It is strongly associated with **low-lying placentas**, placenta previa, velamentous cord insertion, and succenturiate placental lobes. * **Option D:** **Cesarean section** is the mandatory mode of delivery. If diagnosed prenatally, an elective CS is usually performed at 34–36 weeks to avoid the rupture of membranes and subsequent fetal hemorrhage. **High-Yield Clinical Pearls for NEET-PG:** 1. **Classic Triad:** Rupture of membranes + Painless vaginal bleeding + Fetal bradycardia/distress. 2. **Diagnosis:** Antenatal diagnosis is made via **Transvaginal Color Doppler Ultrasound** (showing "bird's nest" vessels over the os). 3. **Apt Test:** Used to differentiate fetal hemoglobin from maternal hemoglobin in vaginal blood. 4. **Management:** If diagnosed during labor (vessels felt on PV exam or bleeding starts), immediate **Emergency Cesarean Section** is the only life-saving intervention.

Q: Molar pregnancy is typically diagnosed in which trimester?

First trimester. **Explanation:** **Why the First Trimester is Correct:** In modern obstetric practice, molar pregnancy (Hydatidiform mole) is typically diagnosed in the **first trimester (usually between 8–12 weeks)**. This shift from historical second-trimester diagnoses is due to the routine use of high-resolution **transvaginal ultrasonography (TVS)** and sensitive **quantitative β-hCG assays** during early pregnancy check-ups. Most patients present early with vaginal bleeding (the most common symptom) or are diagnosed incidentally during a dating scan showing the characteristic "snowstorm appearance" or "cluster of grapes" pattern. **Why Other Options are Incorrect:** * **Second Trimester:** Historically, molar pregnancies were diagnosed here when patients presented with "classical" signs like pre-eclampsia before 20 weeks, hyperthyroidism, or the passage of vesicles. Today, early screening makes second-trimester diagnosis rare. * **Third Trimester:** A molar pregnancy cannot progress to the third trimester. If left untreated, it will inevitably result in spontaneous abortion, severe hemorrhage, or the development of gestational trophoblastic neoplasia (GTN) much earlier. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Symptom:** Vaginal bleeding (often described as "prune juice" discharge). * **USG Finding:** "Snowstorm appearance" (due to hydropic villi) and absence of a fetus in a Complete Mole. * **Pathognomonic Sign:** Passage of grape-like vesicles per vaginum. * **Theca Lutein Cysts:** Often seen bilaterally due to extremely high β-hCG levels. * **Associated Complication:** Early-onset Preeclampsia (occurring before 20 weeks gestation) is highly suggestive of a molar pregnancy.

Question 1

A young lady presents with acute abdominal pain and a history of 1.5 months of amenorrhea. Ultrasonography reveals a collection of fluid in the pouch of Douglas and an empty uterine cavity. What is the most likely diagnosis?

Accepted Answer

Ectopic pregnancy

Answer

Pelvic hematocele

Answer

Threatened abortion

Answer

Twisted ovarian cyst

Question 2

In anencephaly, polyhydramnios is seen due to all of the following EXCEPT?

Accepted Answer

Uteroplacental insufficiency

Answer

Transudation of CSF

Answer

Absence of swallowing

Answer

Absent fetal pituitary

Question 3

"Giant's roll over" test for Pregnancy Induced Hypertension is done at what gestational age?

Accepted Answer

28-32 weeks

Answer

22-24 weeks

Answer

24-26 weeks

Answer

32-34 weeks

Question 4

Which of the following is a contraindication for MgSO4, except?

Accepted Answer

Imminent eclampsia

Answer

Renal Failure

Answer

Hypocalcemia

Answer

Myasthenia Gravis

Question 5

Intrauterine growth restriction (IUGR) is caused by all of the following except?

Accepted Answer

Diabetes

Answer

Alcohol

Answer

Smoking

Answer

Chronic renal failure

Question 6

Cholestasis of pregnancy is characterized by:

Accepted Answer

Increased perinatal mortality and recurrence in subsequent pregnancies

Answer

Commonly occurs in the 1st trimester of pregnancy, increased perinatal mortality, and recurrence in subsequent pregnancies

Answer

Increased maternal mortality, increased perinatal mortality, and recurrence in subsequent pregnancies

Answer

Commonly occurs in the 1st trimester of pregnancy and recurrence in subsequent pregnancies

Question 7

What is the primary benefit of using steroids in the treatment of HELLP syndrome?

Accepted Answer

Increase platelet count in severe thrombocytopenia.

Answer

Decrease maternal mortality rate.

Answer

Decrease rate of acute renal failure.

Answer

Increase rate of recovery of liver enzymes.

Question 8

A 24-week pregnant female has developed gestational diabetes. Which of the following congenital anomalies is MOST characteristic of diabetic pregnancy?

Accepted Answer

Caudal regression syndrome

Answer

Multicystic kidneys

Answer

Esophageal atresia

Answer

Duodenal atresia

Question 9

Which of the following is NOT true about vasa previa?

Accepted Answer

Mortality rate of 20% with undiagnosed cases

Answer

Incidence is 1:1500

Answer

Associated with low-lying placenta

Answer

Cesarean section is indicated

Question 10

Molar pregnancy is typically diagnosed in which trimester?

Accepted Answer

First trimester

Answer

Second trimester

Answer

Third trimester

Answer

All of the above

Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine — MCQs

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