Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine Indian Medical PG Practice Questions and MCQs

Question 21: Chances of adverse outcome in a heart disease patient are increased in all of the following periods except?

A. 28-32 weeks of pregnancy
B. At the time of labor
C. 4-5 days after delivery
D. First 4 weeks of pregnancy (Correct Answer)

Explanation: **Explanation:** The hemodynamic burden on the maternal heart is determined by changes in cardiac output, blood volume, and heart rate. The risk of cardiac failure or adverse outcomes is highest when these parameters peak or fluctuate rapidly. **1. Why Option D is correct:** During the **first 4 weeks of pregnancy**, the physiological changes are minimal. Significant increases in blood volume and cardiac output do not begin until the end of the first trimester. Therefore, this period poses the least risk to a patient with heart disease. **2. Why the other options are incorrect:** * **28–32 weeks of pregnancy (Option A):** This is a critical period because **plasma volume reaches its peak** (increasing by nearly 50%). The resulting high cardiac output can lead to decompensation in a compromised heart. * **At the time of labor (Option B):** Each uterine contraction shifts 300–500 mL of blood into the systemic circulation (autotransfusion). Combined with pain and anxiety, this causes a sharp rise in blood pressure and cardiac output, making labor a high-risk period. * **4–5 days after delivery (Option C):** The immediate postpartum period (especially the first 24–48 hours and up to the first week) is the **most dangerous**. The sudden relief of caval compression and the mobilization of extravascular fluid back into the circulation cause a massive increase in venous return (preload), which can trigger sudden pulmonary edema. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of heart disease in pregnancy (India):** Rheumatic Heart Disease (Mitral Stenosis is the most common lesion). * **Most common cause of death in heart disease:** Heart failure. * **Maximum risk of failure:** Immediately after delivery (Postpartum). * **Contraindications to pregnancy:** NYHA Class III/IV, Eisenmenger syndrome, Severe Aortic Stenosis, and Marfan syndrome with aortic root involvement (>4cm).

Question 22: What is the commonest complication of diabetes complicating pregnancy?

A. Ventricular septal defect (VSD) (Correct Answer)
B. Atrial septal defect (ASD)
C. Sacral agenesis
D. Anencephaly

Explanation: **Explanation:** In pregnancies complicated by pre-gestational diabetes (Type 1 or Type 2), the risk of congenital malformations is 3–4 times higher than in the general population, primarily due to the teratogenic effects of maternal hyperglycemia during organogenesis. **1. Why Ventricular Septal Defect (VSD) is correct:** While there are many anomalies associated with diabetes, **Congenital Heart Diseases (CHD)** are the most frequent group of malformations. Among these, **Ventricular Septal Defect (VSD)** is statistically the **most common** specific cardiac anomaly encountered. It is important to distinguish between "most common" and "most specific." **2. Analysis of Incorrect Options:** * **B. Atrial septal defect (ASD):** While ASDs occur in diabetic pregnancies, they are less frequent than VSDs. * **C. Sacral agenesis (Caudal Regression Syndrome):** This is the **most specific** (pathognomonic) malformation associated with maternal diabetes. Although highly characteristic, it is rare. NEET-PG often tests the distinction between "most common" (VSD) and "most specific" (Sacral Agenesis). * **D. Anencephaly:** Neural tube defects (NTDs) are the second most common group of anomalies after cardiac defects, but they occur less frequently than VSDs. **Clinical Pearls for NEET-PG:** * **Most Common System Involved:** Cardiovascular system. * **Most Common Specific Anomaly:** VSD. * **Most Specific/Pathognomonic Anomaly:** Sacral agenesis (Caudal regression). * **HbA1c Correlation:** The risk of malformations increases significantly if the periconceptional HbA1c is >8.5%. * **Gestational Diabetes (GDM):** Unlike pre-gestational diabetes, GDM (developing after 24 weeks) is **not** associated with an increased risk of congenital anomalies because organogenesis is already complete.

Question 23: Which of the following is false regarding placenta previa?

A. Associated with toxemia (Correct Answer)
B. Painless recurrent bleeding
C. Maternal blood loss
D. Severe bleeding may occur

Explanation: **Explanation:** In **Placenta Previa**, the placenta is implanted in the lower uterine segment, over or near the internal os. The hallmark clinical presentation is **painless, causative, and recurrent vaginal bleeding**. **Why Option A is False (The Correct Answer):** Toxemia (Preeclampsia) is classically associated with **Abruptio Placentae**, not placenta previa. In Abruptio, hypertension causes vasospasm and ischemia of the decidual vessels, leading to retroplacental hemorrhage. Conversely, placenta previa is more common in multiparous women and those with previous uterine scars, but it does not have a causal link with hypertensive disorders of pregnancy. **Why the other options are true:** * **Option B (Painless recurrent bleeding):** As the lower uterine segment stretches in the third trimester, the inelastic placenta separates from its attachment, causing bleeding. Since there is no retroplacental clot tension, the bleeding is painless. * **Option C & D (Maternal blood loss/Severe bleeding):** The bleeding in placenta previa is **entirely maternal** in origin (from the placental bed). Because the lower segment contracts poorly compared to the fundus, bleeding can be profuse, sudden, and life-threatening, often requiring emergency intervention. **NEET-PG High-Yield Pearls:** * **Investigation of Choice:** Transvaginal Ultrasound (TVS) is the gold standard (safer and more accurate than transabdominal). * **Contraindication:** **Digital vaginal examination** is strictly contraindicated unless the patient is in the operation theater for a "Double Setup" examination, as it can provoke torrential hemorrhage. * **Stallworthy’s Sign:** A drop in fetal heart rate when the fetal head is pressed into the pelvis (seen in posterior placenta previa).

Question 24: Which umbilical artery Doppler finding most significantly predicts intrauterine fetal death?

A. Reversal of diastolic flow (Correct Answer)
B. Absent diastolic flow
C. Absent systolic flow
D. Presence of diastolic notch

Explanation: **Explanation:** Umbilical artery (UA) Doppler is a vital tool for monitoring fetuses with Fetal Growth Restriction (FGR). It reflects placental vascular resistance; as resistance increases, the diastolic flow progressively decreases. **1. Why "Reversal of Diastolic Flow" is correct:** Reversed End-Diastolic Velocity (REVDV) represents the most advanced stage of placental insufficiency. It occurs when more than 70% of the placental vascular bed is obliterated. During diastole, the high resistance in the placenta causes blood to actually flow backward toward the fetal heart. This finding is a critical "pre-terminal" sign, indicating extreme fetal hypoxia and acidosis, and is the strongest predictor of impending intrauterine fetal death (IUFD). **2. Analysis of Incorrect Options:** * **Absent Diastolic Flow (AEDV):** This occurs when approximately 60-70% of the placental bed is damaged. While a serious sign of fetal compromise, it precedes reversal and carries a lower immediate risk of IUFD compared to REVDV. * **Absent Systolic Flow:** This is not a recognized clinical stage in UA Doppler. If systolic flow were absent, it would imply a complete lack of cardiac output, which is incompatible with life. * **Presence of Diastolic Notch:** This is a characteristic finding in **Uterine Artery** Doppler (maternal side), indicating a failure of trophoblastic invasion and a risk for pre-eclampsia/FGR, but it does not predict immediate fetal death. **Clinical Pearls for NEET-PG:** * **Sequence of Deterioration:** Reduced Diastolic Flow → Absent Diastolic Flow (AEDV) → Reversed Diastolic Flow (REVDV). * **Management:** REVDV in a viable fetus (>32 weeks) is usually an indication for immediate delivery via Cesarean section. * **Ductus Venosus:** If UA Doppler shows REVDV, the next step is often checking the Ductus Venosus; reversal of the 'a' wave here is the final sign before fetal demise.

Question 25: Multiple bih are commonest among?

A. Indians
B. Mongol
C. Caucasians
D. Negroes (Correct Answer)

Explanation: **Explanation:** The incidence of spontaneous twinning (specifically dizygotic twins) varies significantly across different ethnic groups and geographical locations. This variation is primarily attributed to differences in the levels of endogenous Follicle Stimulating Hormone (FSH) and genetic predispositions. **1. Why Negroes is the correct answer:** The highest incidence of spontaneous multiple births is observed in the **African race (Negroes)**. The rate is approximately **1 in 20 births** in certain West African populations (e.g., the Yoruba tribe in Nigeria). This is linked to higher baseline FSH levels, which increase the likelihood of multiple ovulations in a single cycle. **2. Why other options are incorrect:** * **Caucasians:** They have an intermediate incidence rate, traditionally cited as approximately **1 in 80 to 100 births**. * **Indians:** Similar to other Asian populations, the incidence in India is generally lower than in African and Caucasian populations, though it is higher than in the Mongoloid race. * **Mongol (Asians):** This group has the **lowest incidence** of spontaneous twinning, occurring in approximately **1 in 155 births** (notably low in Japan and China). **Clinical Pearls for NEET-PG:** * **Hellin’s Rule:** A mathematical formula to estimate the frequency of multiple births: Twins = 1:80, Triplets = 1:80², Quadruplets = 1:80³. * **Dizygotic (DZ) vs. Monozygotic (MZ):** The variation in incidence is almost entirely due to **Dizygotic twins**. The rate of Monozygotic (identical) twins is remarkably constant worldwide at approximately **3–4 per 1,000 births**, regardless of race, age, or parity. * **Risk Factors for DZ Twins:** Increasing maternal age (peaks at 37 years), high parity, and the use of assisted reproductive technologies (ART).

Question 26: A 20-year-old primigravida at 30 weeks of gestation has polyhydramnios. What advice should be given?

A. Bed rest
B. Artificial rupture of membranes
C. Oral indomethacin (Correct Answer)
D. Restriction of oral fluids

Explanation: **Explanation:** The management of polyhydramnios depends on the severity, gestational age, and presence of maternal symptoms. In this case, **Oral Indomethacin** is the pharmacological treatment of choice for symptomatic polyhydramnios before 32 weeks of gestation. **Why Indomethacin is correct:** Indomethacin is a prostaglandin synthetase inhibitor. It reduces amniotic fluid volume through two primary mechanisms: 1. **Decreased fetal urine production:** It reduces renal blood flow in the fetus, leading to decreased urine output (the primary source of amniotic fluid in the third trimester). 2. **Increased fluid resorption:** It enhances the resorption of lung fluid and increases the movement of fluid across fetal membranes. **Why the other options are incorrect:** * **Bed rest:** While often advised in pregnancy complications, there is no clinical evidence that bed rest reduces amniotic fluid volume. * **Artificial rupture of membranes (ARM):** This is contraindicated in polyhydramnios before the onset of labor. Sudden decompression can lead to catastrophic complications like **cord prolapse** or **abruptio placentae**. * **Restriction of oral fluids:** Maternal hydration status has a negligible effect on amniotic fluid volume; restricting fluids is ineffective and may cause maternal dehydration. **NEET-PG High-Yield Pearls:** * **Therapeutic Window:** Indomethacin should not be used after **32 weeks** due to the risk of premature closure of the **ductus arteriosus** and oligohydramnios. * **Monitoring:** Fetal echocardiography is required to monitor for ductal constriction if used for more than 48–72 hours. * **Amnioreduction:** If the patient is severely symptomatic (respiratory distress) or beyond 32 weeks, **therapeutic amniocentesis** (amnioreduction) is the preferred intervention. * **Common Cause:** Always screen for **Gestational Diabetes Mellitus (GDM)** and fetal structural anomalies (e.g., esophageal atresia) when polyhydramnios is detected.

Question 27: What is the recurrence rate of ectopic pregnancy in a patient previously treated for ectopic pregnancy?

A. 25%
B. 15% (Correct Answer)
C. 30%
D. 50%

Explanation: **Explanation:** The recurrence of ectopic pregnancy is a critical clinical concern because the underlying risk factors (such as pelvic inflammatory disease, tubal surgery, or endometriosis) often affect both fallopian tubes. **1. Why 15% is correct:** Statistically, after one ectopic pregnancy, the risk of recurrence in a subsequent pregnancy is approximately **15%**. If a patient has a history of two or more ectopic pregnancies, the risk rises significantly to about **30%**. The risk remains similar regardless of whether the initial management was medical (Methotrexate) or surgical (Salpingostomy/Salpingectomy), provided the contralateral tube is healthy. **2. Analysis of Incorrect Options:** * **A (25%):** This value is higher than the standard risk after a single episode. However, it is closer to the risk seen after two prior ectopic pregnancies. * **C (30%):** This is the recurrence rate specifically for women with **two or more** prior ectopic pregnancies, not one. * **D (50%):** This is an overestimation. While the risk is 7–10 times higher than the general population (where the incidence is ~1-2%), it does not reach 50%. **3. NEET-PG High-Yield Pearls:** * **Most common site:** Ampulla of the Fallopian tube (70%). * **Most common risk factor:** Prior history of Pelvic Inflammatory Disease (PID) / Chlamydia infection. * **Strongest risk factor:** Previous history of ectopic pregnancy. * **Management Pearl:** In a patient with a previous ectopic pregnancy, the first step in a subsequent pregnancy is an early transvaginal scan (TVS) at 5–6 weeks to confirm intrauterine location. * **Future Fertility:** Approximately 60% of women achieve a successful intrauterine pregnancy following an ectopic gestation.

Question 28: A large baby is born with which complication in pregnancy?

A. Gestational diabetes (Correct Answer)
B. Gestational hypertension
C. Cardiac disease
D. Anemia

Explanation: **Explanation:** The correct answer is **Gestational Diabetes Mellitus (GDM)**. The underlying pathophysiology is the **Pedersen Hypothesis**: maternal hyperglycemia leads to fetal hyperglycemia. Since insulin does not cross the placenta but glucose does, the fetal pancreas responds by secreting excess insulin. **Fetal hyperinsulinism** acts as a potent growth hormone, leading to increased fat deposition and organomegaly, resulting in a large-for-gestational-age (LGA) baby or **macrosomia** (birth weight >4 kg). **Analysis of Incorrect Options:** * **Gestational Hypertension:** Hypertensive disorders of pregnancy typically cause **uteroplacental insufficiency**, leading to Fetal Growth Restriction (FGR) and small-for-gestational-age (SGA) babies, rather than large babies. * **Cardiac Disease:** Maternal cardiac compromise often results in chronic fetal hypoxia and reduced nutrient delivery, commonly leading to **low birth weight** and preterm delivery. * **Anemia:** Severe maternal anemia is associated with increased risks of preterm labor and **FGR** due to decreased oxygen-carrying capacity to the fetus. **High-Yield NEET-PG Pearls:** * **Most common cause of macrosomia:** Maternal Diabetes (Pre-gestational or Gestational). * **Shoulder Dystocia:** The most dreaded birth complication of a large baby in GDM; it occurs because the trunk/shoulders are disproportionately larger than the head. * **Neonatal Complications of GDM:** Hypoglycemia (most common), hypocalcemia, hyperbilirubinemia, and Polycythemia. * **Screening:** In India, the **DIPSI guidelines** (75g oral glucose regardless of last meal) are commonly used for screening GDM.

Question 29: For maturity estimation, amniotic fluid cells are stained with which of the following?

A. Nile blue sulphate (Correct Answer)
B. Methylene blue
C. Mucicarmine
D. Sudan black

Explanation: **Explanation:** The correct answer is **Nile blue sulphate**. This test is used to assess fetal maturity by identifying **sebaceous gland activity** in the fetus. **1. Why Nile Blue Sulphate is Correct:** As the fetus matures (typically after 34–36 weeks), the sebaceous glands begin to function, shedding lipid-containing cells (sebocytes) into the amniotic fluid. When amniotic fluid is stained with 0.1% Nile blue sulphate, these lipid-rich cells—often called **"orange bodies"**—stain a distinct orange or gold color. * **Clinical Interpretation:** If >20% of the cells stain orange, it indicates a gestational age of >36 weeks (fetal maturity). **2. Why the Other Options are Incorrect:** * **Methylene blue:** Primarily used as a functional dye (e.g., to check tubal patency in chromopertubation) or to treat methemoglobinemia. It does not specifically stain lipids for maturity testing. * **Mucicarmine:** A histological stain used specifically to identify **mucin** (acid mucopolysaccharides). It is commonly used in pathology to detect epithelial mucins or *Cryptococcus* capsules. * **Sudan black:** While it is a lipid stain, it is traditionally used in hematopathology to differentiate acute myeloid leukemia (AML) from acute lymphocytic leukemia (ALL) by staining myeloblasts. It is not the standard for amniotic fluid maturity testing. **High-Yield Clinical Pearls for NEET-PG:** * **L/S Ratio:** The gold standard for fetal lung maturity is a Lecithin/Sphingomyelin ratio **>2**. * **Phosphatidylglycerol (PG):** Its presence in amniotic fluid is a highly specific indicator of lung maturity, especially useful in diabetic pregnancies. * **Shake Test (Bubble Stability Test):** A bedside screening test for surfactant; persistence of bubbles after shaking with ethanol indicates maturity. * **Creatinine levels:** Amniotic fluid creatinine **>2 mg/dL** also suggests fetal maturity (reflecting mature fetal muscle mass and renal function).

Question 30: On Doppler studies, which finding is an ominous sign for an Intrauterine Growth Restriction (IUGR) fetus?

A. Increased S/D ratio
B. Reverse diastolic flow (Correct Answer)
C. Diastolic notch
D. All of the above

Explanation: **Explanation:** In the management of Intrauterine Growth Restriction (IUGR), Umbilical Artery (UA) Doppler is the gold standard for monitoring fetal well-being and placental resistance. **1. Why Reverse Diastolic Flow (REDF) is the correct answer:** As placental insufficiency worsens, the resistance in the umbilical artery increases. Initially, this leads to a decrease in end-diastolic flow. When more than 70% of the placental vascular bed is obliterated, the flow during diastole stops (Absent End Diastolic Velocity - AEDV). The most critical and **ominous** stage is **Reversed End Diastolic Velocity (REDF)**, where blood actually flows back toward the fetus during diastole. This indicates imminent fetal compromise, severe hypoxia, and acidosis, usually necessitating immediate delivery. **2. Why other options are incorrect:** * **A. Increased S/D ratio:** This is an early sign of increased placental resistance. While abnormal, it is not "ominous" as it precedes AEDV and REDV. * **B. Diastolic notch:** A notch in the **Uterine Artery** waveform (not Umbilical) at 20–24 weeks is a screening marker for the *risk* of developing pre-eclampsia or IUGR, but it is not a sign of acute fetal jeopardy. **Clinical Pearls for NEET-PG:** * **Sequence of Doppler changes:** Increased S/D ratio → AEDV → REDV → Abnormal Ductus Venosus (DV) flow (a-wave reversal). * **Ductus Venosus:** Reversal of the 'a-wave' in the DV is the most specific predictor of fetal death within 48–72 hours. * **Brain Sparing Effect:** Identified by a *decrease* in the Pulsatility Index (PI) of the Middle Cerebral Artery (MCA), indicating blood shunting to the fetal brain.

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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