Maternal-Fetal Medicine Practice Questions

Q: Supine hypotension syndrome occurs in which condition?

Advanced pregnancy. ### Explanation **Supine Hypotension Syndrome** (also known as Aortocaval Compression Syndrome) occurs primarily in **advanced pregnancy** (usually after 20 weeks of gestation). #### Why Advanced Pregnancy is Correct: The underlying mechanism is the **mechanical compression** of the **Inferior Vena Cava (IVC)** and the abdominal aorta by the gravid uterus when the woman lies in a supine position. 1. **Venous Return:** Compression of the IVC leads to a significant decrease in venous return to the heart (preload). 2. **Cardiac Output:** Reduced preload results in decreased stroke volume and cardiac output. 3. **Hypotension:** This manifests as a drop in maternal blood pressure, leading to symptoms like dizziness, nausea, pallor, and syncope. It can also cause fetal distress due to reduced placental perfusion. #### Why Other Options are Incorrect: * **Early Pregnancy:** The uterus is still a pelvic organ or not large enough to exert significant pressure on the retroperitoneal vessels. * **Obesity & Ascites:** While these conditions increase intra-abdominal pressure, they rarely cause the acute, posture-dependent vascular collapse seen in pregnancy. The gravid uterus is a unique, solid, and heavy mass that specifically targets the IVC when supine. #### NEET-PG High-Yield Pearls: * **Management:** The immediate treatment is the **Left Lateral Position**, which shifts the uterus off the IVC, restoring venous return. * **Aortic Compression:** While IVC compression causes maternal hypotension, compression of the **Aorta** can lead to "Poseiro Effect" (fetal hypoxemia without maternal hypotension). * **Clinical Tip:** During CPR in a pregnant woman, manual **Left Uterine Displacement (LUD)** is a critical step to ensure effective chest compressions.

Q: Which of the following conditions is the most frequent cause of spontaneous abortion in the first trimester of pregnancy?

Chromosomal abnormalities. **Explanation:** **1. Why Chromosomal Abnormalities is Correct:** Chromosomal abnormalities are the single most common cause of spontaneous abortion, accounting for approximately **50-60%** of all first-trimester miscarriages. Among these, **Autosomal Trisomies** are the most frequent (Trisomy 16 being the most common specific trisomy), followed by Monosomy X (Turner Syndrome) and Polyploidy. These genetic errors usually occur de novo during gametogenesis or early fertilization, leading to non-viable embryos that the body naturally expels. **2. Why Other Options are Incorrect:** * **Abruptio Placentae (A):** This is the premature separation of the placenta, typically occurring in the **third trimester**. It is a cause of antepartum hemorrhage and fetal distress, not first-trimester spontaneous abortion. * **Chorioamnionitis (B):** This is an intra-amniotic infection usually associated with prolonged rupture of membranes. While it can cause mid-trimester loss or preterm labor, it is not the leading cause of early first-trimester miscarriage. * **Placenta Previa (D):** This refers to the placenta covering the internal os. Like abruption, it is a cause of **late-pregnancy bleeding** (antepartum hemorrhage) and does not cause first-trimester spontaneous abortion. **3. NEET-PG High-Yield Pearls:** * **Most common Trisomy in miscarriages:** Trisomy 16. * **Most common single chromosomal anomaly:** Monosomy X (45, X). * **Second most common cause of miscarriage:** Maternal endocrine factors (e.g., Luteal Phase Defect, uncontrolled Diabetes). * **Recurrent Pregnancy Loss (RPL):** Defined as $\geq$ 2 consecutive spontaneous abortions; the most common treatable cause is Antiphospholipid Antibody Syndrome (APS).

Q: Late deceleration in fetal heart rate monitoring is suggestive of:

Fetal hypoxia. **Explanation:** **Late decelerations** are characterized by a gradual decrease in fetal heart rate (FHR) that begins *after* the peak of the uterine contraction and returns to baseline only after the contraction has ended. This pattern is a hallmark sign of **uteroplacental insufficiency**. During a contraction, uterine blood flow decreases; if the placental reserve is already low, the fetus experiences a drop in $PO_2$ below the critical threshold. This triggers chemoreceptors, leading to a vagal response and myocardial depression, resulting in **fetal hypoxia** and metabolic acidosis. **Analysis of Incorrect Options:** * **B. Head Compression:** This causes **Early Decelerations**. The pressure on the fetal head increases vagal tone, causing a heart rate dip that mirrors the contraction (the nadir of the FHR coincides with the peak of the contraction). It is considered physiological. * **C. Cord Compression:** This leads to **Variable Decelerations**. These are abrupt in onset and offset and vary in timing relative to contractions. They are the most common type of deceleration seen in labor. * **D. Fetal Death:** While hypoxia can lead to death, late decelerations are a sign of a struggling, live fetus. Fetal death is confirmed by the absence of cardiac activity on ultrasound or Doppler. **High-Yield Clinical Pearls for NEET-PG:** * **VEAL CHOP Mnemonic:** **V**ariable = **C**ord; **E**arly = **H**ead; **A**ccelerations = **O**k (Oxygenated); **L**ate = **P**lacenta. * Late decelerations are categorized as **Category III** (Abnormal) if associated with absent variability, requiring immediate resuscitation or delivery. * The first step in management is "intrauterine resuscitation": Left lateral position, oxygen, IV fluids, and stopping oxytocin.

Q: What is the drug of choice for imminent eclampsia?

Magnesium sulfate. **Explanation:** **Magnesium Sulfate (MgSO₄)** is the drug of choice for both the **prevention** of seizures in imminent eclampsia and the **treatment** of seizures in established eclampsia. The underlying medical concept relies on its role as a potent neuromuscular blocker and CNS depressant. It acts by inhibiting NMDA receptors, blocking calcium influx into neurons, and decreasing acetylcholine release at the motor endplate, thereby raising the seizure threshold. Large-scale trials (like the Magpie Trial) have proven its superiority over diazepam and phenytoin in preventing the progression of pre-eclampsia to eclampsia. **Analysis of Incorrect Options:** * **Hydralazine (A) & Labetalol (B):** These are antihypertensive agents. While they are used to manage hypertensive emergencies in pregnancy (BP ≥160/110 mmHg), they do not possess anti-convulsant properties and cannot prevent seizures. Labetalol is often the first-line IV antihypertensive, but it is not the drug of choice for "imminent eclampsia." * **Methyldopa (D):** This is a centrally acting alpha-2 agonist. It is the drug of choice for **chronic hypertension** in pregnancy due to its long-term safety profile, but it is too slow-acting for acute management or seizure prophylaxis. **High-Yield Clinical Pearls for NEET-PG:** * **Pritchard Regimen:** 4g IV (loading) + 10g IM (5g in each buttock), followed by 5g IM every 4 hours. * **Therapeutic Range:** 4–7 mEq/L. * **Monitoring:** Always check for **Patellar reflex** (earliest sign of toxicity), **Respiratory rate** (>12/min), and **Urine output** (>30ml/hr). * **Antidote:** 10 ml of 10% **Calcium Gluconate** IV (given over 10 minutes).

Q: You are called to the operating room for a patient found to have an abdominal pregnancy with an 18-week fetus and placenta attached to the omentum during surgery for suspected appendicitis. What is the best course of action?

Removal of the fetus only. **Explanation:** The management of abdominal pregnancy is a high-stakes scenario in maternal-fetal medicine. The primary challenge is the **placenta**, which lacks the contractile myometrium of the uterus to control bleeding after separation. **1. Why "Removal of the fetus only" is correct:** In abdominal pregnancies, the placenta often attaches to highly vascular organs (like the omentum, bowel, or major vessels). Attempting to detach the placenta can lead to **uncontrollable, life-threatening hemorrhage**. The standard recommendation is to ligate the umbilical cord close to the placenta and leave the placenta *in situ*. It is then allowed to undergo spontaneous resorption, which can be monitored using serial β-hCG levels and ultrasound. Methotrexate may occasionally be used to accelerate this process. **2. Why the other options are incorrect:** * **Option A:** Removing the placenta is contraindicated unless it is attached to a simple, pedicled structure (like the omentum) that can be easily ligated and removed entirely. However, as a general rule for exams, "leaving the placenta" is the safest answer to prevent surgical catastrophe. * **Option B:** While the cord is ligated, the fetus must be removed to prevent infection, lithopedion formation, or further complications. * **Option D:** Abdominal pregnancy carries a very high risk of maternal mortality and fetal anomalies (due to oligohydramnios). Expectant management until viability is rarely recommended and is extremely hazardous. **Clinical Pearls for NEET-PG:** * **Diagnosis:** Often suggested by "easily palpable fetal parts" and an "empty uterus" on ultrasound. * **Management of Placenta:** If left behind, the patient is at risk for bowel obstruction and infection. * **Most common site:** The Pouch of Douglas. * **Key Rule:** Never attempt to peel the placenta off a vital organ.

Q: Bleeding is of fetal origin in which of the following conditions?

Vasa previa. **Explanation:** In **Vasa Previa**, fetal blood vessels (unprotected by Wharton’s jelly or placental tissue) run across the internal os of the cervix, usually due to a velamentous cord insertion or succenturiate lobe. When the membranes rupture (spontaneously or artificially), these fetal vessels are lacerated. Because the blood lost comes directly from the fetal circulation, even a small amount of bleeding can lead to rapid fetal exsanguination and distress, while the mother remains hemodynamically stable. **Analysis of Incorrect Options:** * **Placenta Accreta, Increta, and Percreta:** These are spectrums of morbidly adherent placenta where the chorionic villi invade the myometrium to varying depths (Accreta: superficial; Increta: into myometrium; Percreta: through serosa). Bleeding in these conditions occurs during attempts at placental delivery and is **maternal** in origin (from the uterine spiral arteries). **High-Yield Clinical Pearls for NEET-PG:** * **The Classic Triad:** Rupture of membranes + Painless vaginal bleeding + Fetal bradycardia/distress. * **Diagnostic Test:** To differentiate fetal from maternal blood, the **Apt test** or **Ogita test** is used (based on the resistance of fetal hemoglobin to alkali denaturation). * **Antenatal Diagnosis:** Color Doppler ultrasound is the gold standard for identifying vessels crossing the os. * **Management:** If diagnosed antenatally, a planned Cesarean section is performed (usually at 34–36 weeks) to avoid labor and membrane rupture.

Q: What is the standard regimen of magnesium sulfate for the management of severe pre-eclampsia and eclampsia?

Pritchard regimen. **Explanation:** Magnesium sulfate ($MgSO_4$) is the drug of choice for preventing and treating seizures in severe pre-eclampsia and eclampsia. The **Pritchard regimen** (intramuscular) and the **Zuspan regimen** (intravenous) are the two globally recognized protocols. **Why Option B is Correct:** The **Pritchard regimen** is the standard intramuscular (IM) protocol. It consists of: * **Loading Dose:** 4g IV (20% solution) over 5–10 minutes + 10g IM (5g in each buttock as a 50% solution). * **Maintenance Dose:** 5g IM every 4 hours in alternating buttocks. It is preferred in settings where infusion pumps are unavailable, making it a high-yield topic for exams focusing on Indian clinical scenarios. **Analysis of Incorrect Options:** * **A. Menon Regimen:** This is an older "Lytic Cocktail" (Chlorpromazine, Promethazine, and Pethidine) used before $MgSO_4$ became the gold standard. It is no longer recommended due to inferior efficacy and neonatal depression. * **C. Lean Regimen:** This is a distractor; there is no standard obstetric protocol by this name. * **D. Pinard’s Regimen:** Pinard refers to a maneuver for breech extraction (bringing down a leg) or a type of stethoscope used for fetal heart sounds, not a pharmacological regimen. **High-Yield Clinical Pearls for NEET-PG:** 1. **Therapeutic Range:** 4–7 mEq/L. 2. **Toxicity Signs:** Loss of patellar reflex (first sign, 8–10 mEq/L) $\rightarrow$ Respiratory depression (12 mEq/L) $\rightarrow$ Cardiac arrest (>25 mEq/L). 3. **Prerequisites for Maintenance:** Urine output >30 ml/hr, Respiratory rate >12-14/min, and presence of Patellar reflex. 4. **Antidote:** 10 ml of 10% **Calcium Gluconate** IV (given over 10 minutes).

Q: What is the commonest cause of perinatal mortality in twins?

Prematurity. **Explanation:** **1. Why Prematurity is Correct:** Prematurity is the single most significant factor contributing to perinatal mortality and morbidity in twin gestations. While the average singleton pregnancy lasts 40 weeks, the average twin pregnancy lasts approximately 37 weeks. About 50% of twins are born preterm (before 37 weeks), and nearly 10% are born very preterm (before 32 weeks). The complications associated with prematurity—specifically **Respiratory Distress Syndrome (RDS)**, intraventricular hemorrhage, and necrotizing enterocolitis—are the primary drivers of neonatal death in these cases. **2. Why Other Options are Incorrect:** * **Infection:** While chorioamnionitis or neonatal sepsis can occur, they are often secondary to prolonged rupture of membranes or consequences of prematurity itself, rather than the primary statistical cause of death. * **Head Injury:** Birth trauma (like intracranial hemorrhage) was more common historically due to difficult vaginal deliveries of the second twin. However, with modern obstetric management and increased C-section rates for malpresentations, it is now a rare cause of mortality. * **Malnutrition:** While **Intrauterine Growth Restriction (IUGR)** and discordant growth are common in twins (especially Monochorionic), they typically lead to morbidity rather than being the leading cause of mortality compared to the systemic failures of prematurity. **High-Yield Clinical Pearls for NEET-PG:** * **Average duration of pregnancy:** Singletons (40 weeks), Twins (37 weeks), Triplets (33 weeks), Quadruplets (29 weeks). * **Monochorionic twins** have a 3–5 times higher mortality rate than dichorionic twins due to unique complications like **Twin-to-Twin Transfusion Syndrome (TTTS)**. * The **second twin** is generally at a higher risk of hypoxia and birth trauma than the first twin. * **Most common malpresentation in twins:** Cephalic-Cephalic (approx. 40-45%).

Question 1

In Erythroblastosis fetalis, why is the first child typically spared?

Accepted Answer

Sensitization of Rh-negative mothers by a Rh-positive fetus generally occurs at birth.

Answer

The immune response during a second exposure is rapid.

Answer

Small amounts of fetal blood leak into the maternal circulation at the time of delivery.

Answer

Mothers develop significant titers of anti-Rh agglutinins during the postpartum period.

Question 2

A 20-year-old woman, gravida 3, para 2, has a screening ultrasound at 18 weeks' gestation that shows hydrops fetalis but no malformations. The woman's two previous pregnancies ended at term in live births. The current pregnancy results in a live birth at 36 weeks. Physical examination shows marked hydrops of the neonate and placenta. Laboratory studies show a cord blood hemoglobin level of 9.2 g/dL and total bilirubin concentration of 20.2 mg/dL. Which of the following laboratory findings is most likely to be present in this case?

Accepted Answer

Positive Coombs test result on cord blood

Answer

Diminished glucocerebrosidase activity in fetal cells

Answer

Elevated maternal serum alpha-fetoprotein level

Answer

Positive maternal hepatitis B surface antigen

Question 3

Supine hypotension syndrome occurs in which condition?

Accepted Answer

Advanced pregnancy

Answer

Obesity

Answer

Ascites

Answer

Early pregnancy

Question 4

Which of the following conditions is the most frequent cause of spontaneous abortion in the first trimester of pregnancy?

Accepted Answer

Chromosomal abnormalities

Answer

Abruptio placentae

Answer

Chorioamnionitis

Answer

Placenta previa

Question 5

Late deceleration in fetal heart rate monitoring is suggestive of:

Accepted Answer

Fetal hypoxia

Answer

Head compression

Answer

Cord compression

Answer

Fetal death

Question 6

What is the drug of choice for imminent eclampsia?

Accepted Answer

Magnesium sulfate

Answer

Hydralazine

Answer

Labetalol

Answer

Methyldopa

Question 7

You are called to the operating room for a patient found to have an abdominal pregnancy with an 18-week fetus and placenta attached to the omentum during surgery for suspected appendicitis. What is the best course of action?

Accepted Answer

Removal of the fetus only

Answer

Removal of both fetus and placenta

Answer

Laparoscopic ligation of the umbilical cord

Answer

Closely follow until viability and then deliver by laparotomy

Question 8

Bleeding is of fetal origin in which of the following conditions?

Accepted Answer

Vasa previa

Answer

Placenta accreta

Answer

Placenta percreta

Answer

Placenta increta

Question 9

What is the standard regimen of magnesium sulfate for the management of severe pre-eclampsia and eclampsia?

Accepted Answer

Pritchard regimen

Answer

Menon regimen

Answer

Lean regimen

Answer

Pinard's regimen

Question 10

What is the commonest cause of perinatal mortality in twins?

Accepted Answer

Prematurity

Answer

Infection

Answer

Head injury

Answer

Malnutrition

Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine — MCQs

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