Maternal-Fetal Medicine — MCQs

A 30-year-old G3P2 patient at 20 weeks gestation presents to an antenatal clinic. Her first child weighed 4.6 kg and was delivered via cesarean section, and her second child weighed 4.8 kg and was also delivered by cesarean section. Based on this history, gestational diabetes is suspected and a glucose challenge test (GCT) is ordered. The patient's blood sugar level after a 50 g oral glucose load is 206 mg/dl, confirming gestational diabetes. Which of the following is NOT a known complication of gestational diabetes?

Q600Medium

Pregnancy which continues following a threatened abortion is likely to have an increased incidence of which of the following?

Maternal-Fetal Medicine Indian Medical PG Practice Questions and MCQs

Question 591: What type of seizures are characteristic of eclampsia?

A. Focal seizures
B. Absence seizures
C. Generalised Tonic-Clonic Seizures (Correct Answer)
D. Myoclonic seizures

Explanation: **Explanation:** **Eclampsia** is defined as the onset of seizures in a woman with pre-eclampsia that cannot be attributed to other causes. The characteristic seizure type in eclampsia is **Generalised Tonic-Clonic Seizures (GTCS)**. **Why GTCS is the correct answer:** The pathophysiology involves cerebral vasospasm, edema, and loss of cerebral autoregulation (often termed Posterior Reversible Encephalopathy Syndrome or PRES). This leads to widespread cortical irritability, resulting in a classic four-stage seizure: 1. **Invasion:** Facial twitching. 2. **Tonic phase:** Generalized muscular rigidity (lasts ~20 seconds). 3. **Clonic phase:** Violent rhythmic contractions and tongue biting (lasts ~1-2 minutes). 4. **Coma:** A period of unconsciousness and post-ictal confusion. **Why other options are incorrect:** * **Focal seizures:** These involve a specific area of the brain. While eclampsia can occasionally present with focal neurological deficits, the hallmark seizure is generalized. * **Absence seizures:** These involve brief lapses in consciousness without motor activity, typical of childhood epilepsy, not the violent convulsions of eclampsia. * **Myoclonic seizures:** These are brief, shock-like jerks of a muscle group, which do not follow the tonic-clonic progression seen in eclamptic patients. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC):** Magnesium Sulfate ($MgSO_4$) is the DOC for both prophylaxis and treatment of eclamptic seizures (Pritchard Regimen). * **Antidote for $MgSO_4$:** Calcium Gluconate (10 ml of 10% solution). * **Timing:** Eclampsia most commonly occurs **antepartum** (50%), followed by intrapartum (25%) and postpartum (25%). * **Definitive Treatment:** Delivery of the fetus, regardless of gestational age, once the mother is stabilized.

Question 592: Which of the following is a pathognomonic feature of ectopic pregnancy?

A. Purple hemorrhagic mass in the lower vagina
B. Decidual casts (Correct Answer)
C. Chadwick sign
D. Postcoital hemorrhage

Explanation: ### Explanation **Correct Answer: B. Decidual casts** In ectopic pregnancy, the high levels of progesterone produced by the corpus luteum cause the uterine endometrium to undergo a **decidual reaction** (thickening and vascularization) to prepare for an embryo that never arrives in the uterus. When the ectopic pregnancy begins to fail or the hormonal support drops, the entire decidualized lining sloughs off and is expelled through the cervix in one piece, mimicking the shape of the uterine cavity. This is known as a **decidual cast**. While not present in every case, it is considered a classic, pathognomonic sign of ectopic pregnancy when it occurs. **Analysis of Incorrect Options:** * **A. Purple hemorrhagic mass in the lower vagina:** This is a characteristic finding of **Gestational Trophoblastic Neoplasia (Choriocarcinoma)**, representing vaginal metastasis. * **C. Chadwick sign:** This refers to the bluish discoloration of the cervix, vagina, and labia due to increased vascularity. It is a **presumptive sign of pregnancy** (both intrauterine and ectopic) but is not specific to ectopic pregnancy. * **D. Postcoital hemorrhage:** This is most commonly associated with **cervical pathology**, such as cervical polyps, cervicitis, or cervical cancer. **NEET-PG High-Yield Pearls:** * **Arias-Stella Reaction:** A microscopic finding in the endometrium (hypersecretory glands with enlarged nuclei) seen in ectopic pregnancy; it is suggestive but not pathognomonic as it can also occur in intrauterine pregnancies. * **Classic Triad:** Amenorrhea, abdominal pain, and vaginal bleeding (present in only 50% of cases). * **Gold Standard Diagnosis:** Transvaginal Ultrasound (TVUS) + Serum β-hCG (Discriminatory zone: 1500–2000 mIU/mL). * **Most Common Site:** Ampulla of the Fallopian tube.

Question 593: What is the earliest detectable congenital malformation by ultrasound?

A. Spina bifida
B. Cystic hygroma
C. Anencephaly (Correct Answer)
D. Encephalocele

Explanation: **Explanation:** **Anencephaly** is the correct answer because it is a lethal neural tube defect characterized by the absence of the cranial vault and cerebral hemispheres. It can be reliably detected via transvaginal sonography (TVS) as early as **10 to 11 weeks** of gestation. The diagnosis is based on the "acrania-anencephaly sequence," where the absence of the calvarium (acrania) leads to the degeneration of the exposed brain tissue. On ultrasound, this presents as the classic **"Frog-eye appearance"** or "Mickey Mouse sign" in the coronal view. **Analysis of Incorrect Options:** * **Spina Bifida:** While it occurs at the same embryological stage as anencephaly, the spinal lesions are often subtle in the first trimester. Definitive diagnosis usually occurs during the mid-trimester anomaly scan (18–20 weeks) via indirect cranial signs (Lemon and Banana signs). * **Cystic Hygroma:** This is a malformation of the lymphatic system. While it can be seen in the late first trimester (associated with increased Nuchal Translucency), it is generally detectable slightly later than the initial signs of acrania/anencephaly. * **Encephalocele:** This involves a herniation of cranial contents through a skull defect. Like spina bifida, small encephaloceles are difficult to detect in the early first trimester compared to the total absence of the skull vault seen in anencephaly. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest detection:** Anencephaly (10–11 weeks). * **Biochemical Marker:** Elevated **Alpha-Fetoprotein (AFP)** in maternal serum and amniotic fluid is highly suggestive of open neural tube defects. * **Prevention:** 400 mcg of Folic acid daily (pre-conceptionally) reduces risk by 70%. For a previous history of NTD, the dose is increased to **4 mg**. * **Ultrasound Sign:** "Frog-eye appearance" due to prominent orbits and absent forehead.

Question 594: Which of the following conditions is considered least dangerous in pregnancy?

A. Ebstein's anomaly (Correct Answer)
B. Pulmonary hypertension
C. Cyanotic heart disease
D. Marfan syndrome

Explanation: **Explanation:** In maternal-fetal medicine, cardiac diseases are categorized by their risk of maternal mortality. **Ebstein’s anomaly** is generally well-tolerated during pregnancy, provided there is no significant right-to-left shunting or severe heart failure. In this condition, the tricuspid valve is displaced downward into the right ventricle; however, unless accompanied by severe cyanosis or arrhythmias (like WPW syndrome), most women have successful obstetric outcomes. **Why the other options are more dangerous:** * **Pulmonary Hypertension (Option B):** This is the most lethal condition in pregnancy (mortality rates of 30-50%). The inability of the right ventricle to increase cardiac output against fixed pulmonary resistance leads to sudden cardiovascular collapse, especially during labor or the immediate postpartum period. * **Cyanotic Heart Disease (Option C):** Conditions like Eisenmenger syndrome or uncorrected Tetralogy of Fallot carry a high risk (mortality >25%). Pregnancy-induced systemic vasodilation increases right-to-left shunting, worsening hypoxia for both mother and fetus. * **Marfan Syndrome (Option D):** Pregnancy increases the risk of life-threatening **aortic dissection** or rupture due to hypervolemia and hormonal changes (estrogen/progesterone) affecting the aortic wall integrity, especially if the aortic root diameter exceeds 4 cm. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Class IV (Pregnancy Contraindicated):** Pulmonary hypertension, severe systemic ventricular dysfunction (EF <30%), severe mitral stenosis, and Marfan syndrome with an aortic root >45mm. * **Most common heart disease in pregnancy:** Mitral Stenosis (Rheumatic). * **Most common congenital heart disease in pregnancy:** ASD (Atrial Septal Defect). * **Ebstein’s Anomaly** is uniquely associated with maternal **Lithium** intake during the first trimester.

Question 595: All of the following are common causes of maternal mortality except?

A. Postpartum hemorrhage
B. Infection
C. Cardiac failure (Correct Answer)
D. Anemia

Explanation: **Explanation:** In the context of maternal mortality, causes are categorized into **Direct Obstetric Causes** (complications of the pregnant state) and **Indirect Obstetric Causes** (pre-existing diseases aggravated by pregnancy). **Why Cardiac Failure is the correct answer:** While cardiac disease is a significant cause of maternal morbidity and a leading *indirect* cause of death in developed nations, it is **not** among the most common causes globally or in India when compared to the "Big Three" (Hemorrhage, Sepsis, and Hypertension). In the specific context of NEET-PG, "Cardiac failure" is often the "except" choice because the other options represent the primary drivers of the Maternal Mortality Ratio (MMR). **Analysis of Incorrect Options:** * **Postpartum Hemorrhage (PPH):** This is the **#1 leading cause** of maternal mortality worldwide and in India (accounting for approximately 25-30% of deaths). * **Infection (Sepsis):** Puerperal sepsis remains a major cause of death, particularly in areas with poor access to skilled birth attendance and hygiene. * **Anemia:** While often an indirect cause, severe anemia is a massive contributor to maternal mortality in India, either by causing heart failure or by making the mother unable to withstand even minor blood loss during delivery. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of MMR (India & Global):** Obstetric Hemorrhage (specifically PPH). * **Most common indirect cause of MMR (India):** Anemia. * **Most common indirect cause of MMR (Global/Developed):** Cardiac disease. * **The "Classic Triad" of Maternal Death:** Hemorrhage, Infection (Sepsis), and Hypertension (Eclampsia). * **Target:** The Sustainable Development Goal (SDG) 3.1 aims to reduce the global MMR to less than **70 per 100,000 live births** by 2030.

Question 596: A pregnant woman is found to have excessive accumulation of amniotic fluid. Polyhydramnios is likely to be associated with all of the following conditions, except?

A. Twinning
B. Microanencephaly
C. Oesophageal atresia
D. Bilateral renal agenesis (Correct Answer)

Explanation: **Explanation:** The volume of amniotic fluid is a dynamic balance between production and removal. From the second trimester onwards, **fetal urine** is the primary source of amniotic fluid, while **fetal swallowing** is the primary route of removal. **Why Bilateral Renal Agenesis is the Correct Answer:** In bilateral renal agenesis (Potter’s sequence), the fetus lacks kidneys and cannot produce urine. Since urine is the major contributor to the amniotic pool, its absence leads to **Oligohydramnios** (decreased fluid), not polyhydramnios. This is a classic "must-know" distinction for NEET-PG. **Analysis of Other Options (Causes of Polyhydramnios):** * **Twinning:** Specifically in Monochorionic twins, Twin-to-Twin Transfusion Syndrome (TTTS) leads to polyhydramnios in the recipient twin due to volume overload and polyuria. * **Microanencephaly/Anencephaly:** Polyhydramnios occurs due to two reasons: 1) Failure of the swallowing reflex due to neurological deficit, and 2) Transudation of fluid from the exposed meninges/choroid plexus. * **Oesophageal Atresia:** This creates a mechanical obstruction in the gastrointestinal tract, preventing the fetus from swallowing and absorbing amniotic fluid, leading to its accumulation. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** Polyhydramnios is defined as an Amniotic Fluid Index (AFI) **>25 cm** or a Single Deepest Pocket (SDP) **>8 cm**. * **Maternal Cause:** The most common maternal cause of polyhydramnios is **Maternal Diabetes** (fetal hyperglycemia leads to osmotic diuresis/polyuria). * **Fetal Causes:** Any condition that impairs swallowing (CNS anomalies, GI atresias) or increases urine output (Hydrops fetalis, TTTS) results in polyhydramnios. * **Potter’s Sequence:** Bilateral renal agenesis → Oligohydramnios → Pulmonary hypoplasia and limb deformities.

Question 597: Glucose is transported from the placenta to the fetus by which mechanism?

A. Endocytosis
B. Active transport
C. Facilitated diffusion (Correct Answer)
D. Simple diffusion

Explanation: **Explanation:** The transport of glucose across the placenta is a high-yield concept in Maternal-Fetal Medicine. Glucose is the primary energy source for the fetus, and its transfer occurs via **Facilitated Diffusion**. **1. Why Facilitated Diffusion is Correct:** Glucose molecules are too large and polar to pass through the lipid bilayer by simple diffusion. Instead, they require specific carrier proteins known as **GLUT (Glucose Transporters)**, primarily **GLUT-1**. This process moves glucose down a concentration gradient (from maternal blood to fetal blood) without the expenditure of energy (ATP). This ensures a rapid and continuous supply of glucose to meet fetal metabolic demands. **2. Why Other Options are Incorrect:** * **Endocytosis:** This involves the engulfing of large molecules (e.g., IgG antibodies) into vesicles. It is not used for small metabolic substrates like glucose. * **Active Transport:** This requires ATP to move substances against a concentration gradient. Examples include **Amino acids**, calcium, and water-soluble vitamins. * **Simple Diffusion:** This is reserved for small, uncharged molecules or gases moving down a gradient without a carrier. Examples include **Oxygen ($O_2$)**, Carbon dioxide ($CO_2$), water, and most drugs. **Clinical Pearls for NEET-PG:** * **GLUT-1** is the predominant glucose transporter in the human placenta. * **Fetal glucose levels** are typically 20–30 mg/dL lower than maternal levels to maintain the concentration gradient. * **Insulin** does NOT cross the placenta; the fetus produces its own insulin in response to maternal glucose levels. * **Mnemonic for Placental Transport:** * **S**imple Diffusion: **G**ases (**S**moking/**G**as) * **F**acilitated Diffusion: **G**lucose (**F**ast **G**lucose) * **A**ctive Transport: **A**mino Acids (**A**ctive/**A**mino) * **P**inocytosis/Endocytosis: **I**gG (**P**rotective **I**gG)

Question 598: All the following are hereditary causes of anemia during pregnancy except?

A. Thalassemias
B. Sickle cell anemia
C. Megaloblastic anemia (Correct Answer)
D. Hereditary hemolytic anemia

Explanation: **Explanation:** The core of this question lies in distinguishing between **congenital (hereditary)** and **acquired** causes of anemia. **1. Why Megaloblastic Anemia is the Correct Answer:** Megaloblastic anemia is primarily an **acquired nutritional deficiency** rather than a hereditary condition. In pregnancy, it is most commonly caused by a deficiency of **Folic Acid** (due to increased fetal demand and rapid cell division) or, less frequently, **Vitamin B12**. Since it results from external nutritional factors and physiological demands, it is not passed down through genetic inheritance. **2. Analysis of Incorrect Options (Hereditary Causes):** * **Thalassemias (A):** These are autosomal recessive genetic disorders characterized by a defect in the synthesis of globin chains ($\alpha$ or $\beta$). * **Sickle Cell Anemia (B):** This is an autosomal recessive hemoglobinopathy caused by a point mutation in the $\beta$-globin gene, leading to the production of HbS. * **Hereditary Hemolytic Anemia (D):** This category includes genetic defects of the red cell membrane (e.g., Hereditary Spherocytosis) or enzymes (e.g., G6PD deficiency), all of which are inherited. **3. NEET-PG High-Yield Pearls:** * **Most common cause of anemia in pregnancy:** Iron Deficiency Anemia (Nutritional/Acquired). * **Most common cause of Megaloblastic anemia in pregnancy:** Folic Acid deficiency. * **Prophylactic Dose:** 400 $\mu$g of Folic acid daily is recommended to prevent neural tube defects (NTDs). * **Therapeutic Dose:** 5 mg of Folic acid daily if megaloblastic anemia is diagnosed or if there is a previous history of NTD. * **Dimorphic Anemia:** A common clinical scenario in India where both Iron and Folic acid deficiencies coexist.

Question 599: A 30-year-old G3P2 patient at 20 weeks gestation presents to an antenatal clinic. Her first child weighed 4.6 kg and was delivered via cesarean section, and her second child weighed 4.8 kg and was also delivered by cesarean section. Based on this history, gestational diabetes is suspected and a glucose challenge test (GCT) is ordered. The patient's blood sugar level after a 50 g oral glucose load is 206 mg/dl, confirming gestational diabetes. Which of the following is NOT a known complication of gestational diabetes?

A. Susceptibility for infection
B. Fetal hyperglycemia
C. Congenital malformations in fetus (Correct Answer)
D. Neonatal hypoglycemia

Explanation: ### Explanation The key to answering this question lies in distinguishing between **Gestational Diabetes Mellitus (GDM)** and **Pregnancy with Pre-gestational (Overt) Diabetes**. **1. Why "Congenital malformations" is the correct answer:** Congenital malformations (such as Sacral Agenesis or VSD) occur during **organogenesis**, which takes place in the first 8 weeks of gestation. In GDM, hyperglycemia typically develops in the late second or third trimester (after 24 weeks) due to increased insulin resistance from placental hormones (hPL, Cortisol). Since the glycemic insult occurs *after* the organs have already formed, GDM does **not** increase the risk of structural malformations. Increased malformation risk is exclusively associated with poorly controlled pre-gestational diabetes. **2. Analysis of Incorrect Options:** * **A. Susceptibility for infection:** Hyperglycemia impairs leucocyte function and provides a medium for growth, leading to increased risks of Monilial vulvovaginitis and Urinary Tract Infections (UTIs) in GDM patients. * **B. Fetal hyperglycemia:** Maternal glucose crosses the placenta via facilitated diffusion. Therefore, maternal hyperglycemia directly leads to fetal hyperglycemia. * **D. Neonatal hypoglycemia:** Chronic fetal hyperglycemia leads to fetal pancreatic beta-cell hyperplasia (hyperinsulinism). After birth, the maternal glucose supply is cut off, but the neonate’s high insulin levels persist, causing a rapid drop in blood sugar. **3. NEET-PG High-Yield Pearls:** * **Most common malformation in Overt Diabetes:** Ventricular Septal Defect (VSD). * **Most specific malformation in Overt Diabetes:** Caudal Regression Syndrome (Sacral Agenesis). * **DIPSI Criteria:** A single-step 75g Glucose Tolerance Test is used in India. A 2-hour value **≥140 mg/dl** diagnoses GDM. * **Macrosomia:** Defined as birth weight >4 kg or >4.5 kg; it is the most common fetal complication of GDM due to the "Pedersen Hypothesis" (Maternal hyperglycemia → Fetal hyperinsulinemia → Anabolism).

Question 600: Pregnancy which continues following a threatened abortion is likely to have an increased incidence of which of the following?

A. Preterm labor
B. Fetal malformation
C. Intrauterine growth restriction (IUGR)
D. All of the above (Correct Answer)

Explanation: **Explanation:** Threatened abortion, characterized by vaginal bleeding before 20 weeks of gestation with a closed cervical os, is not merely an isolated event but often reflects underlying **placental dysfunction** or early decidual hemorrhage. When such a pregnancy continues, the initial insult to the maternal-fetal interface predisposes the patient to several late-pregnancy complications. 1. **Preterm Labor (Option A):** Early bleeding is associated with the release of thrombin and inflammatory cytokines, which can trigger uterine contractions and premature rupture of membranes (PROM), leading to preterm delivery. 2. **Fetal Malformations (Option B):** While the association is less frequent than other complications, studies indicate a slightly higher incidence of congenital anomalies (such as skeletal or cardiovascular defects) in pregnancies complicated by early-trimester bleeding, possibly due to transient hypoxia or underlying genetic factors. 3. **Intrauterine Growth Restriction (IUGR) (Option C):** Chronic placental insufficiency resulting from early subchorionic hemorrhage or impaired placentation limits the nutrient and oxygen supply to the fetus, leading to restricted growth and low birth weight. **Why "All of the Above" is Correct:** The underlying medical concept is that threatened abortion is a marker for **"Great Obstetrical Syndromes"**—conditions rooted in defective deep placentation. This increases the risk of a spectrum of adverse outcomes, including Pre-eclampsia, Placental Abruption, and the three options listed above. **Clinical Pearls for NEET-PG:** * **Most common outcome:** Despite the risks, the majority (>70-80%) of threatened abortions that show fetal cardiac activity will result in a healthy live birth. * **Management:** Bed rest is traditionally advised but has **no proven benefit** in preventing miscarriage. Progesterone supplementation is only beneficial in cases of recurrent miscarriage or proven luteal phase defect. * **Rh-Negative Mothers:** Always administer Anti-D immunoglobulin in threatened abortion to prevent isoimmunization.

Practice by Chapter

Fetal Assessment Techniques

Practice Questions

Hypertensive Disorders in Pregnancy

Practice Questions

Intrauterine Growth Restriction

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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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