Maternal-Fetal Medicine Practice Questions

Q: What is the earliest indication of concealed acute bleeding in pregnancy?

Tachycardia. **Explanation:** In the setting of acute concealed bleeding (such as abruptio placentae or ruptured ectopic pregnancy), the body initiates compensatory mechanisms to maintain perfusion to vital organs. **1. Why Tachycardia is correct:** Tachycardia is the **earliest clinical sign** of hypovolemia. When blood volume decreases, venous return to the heart drops, leading to a decrease in stroke volume. To maintain cardiac output ($CO = HR \times SV$), the sympathetic nervous system is activated, increasing the heart rate. In pregnant women, this sign is critical because they can lose up to 30-35% of their blood volume before a significant drop in blood pressure occurs, making tachycardia a more sensitive early indicator than hypotension. **2. Why other options are incorrect:** * **Postural Hypotension:** While an early sign of volume depletion, it requires changing the patient's position to elicit. In acute obstetric emergencies, tachycardia is often observed first during primary assessment. * **Oliguria:** This is a later sign indicating significant renal hypoperfusion and established shock (usually Stage III hemorrhage). * **Low body temperature:** Hypothermia is a late finding associated with the "lethal triad" of trauma/hemorrhage (acidosis, coagulopathy, and hypothermia) and indicates severe, decompensated shock. **Clinical Pearls for NEET-PG:** * **The "Rule of 30":** In obstetric hemorrhage, a systolic BP drop of 30 mmHg, a heart rate increase of 30 bpm, or a 30% loss of blood volume indicates significant distress. * **Shock Index (SI):** Defined as $HR / SBP$. A value $> 0.9$ in pregnancy is a highly sensitive marker for significant concealed hemorrhage and the need for transfusion. * **Note:** Always remember that due to the physiological hypervolemia of pregnancy, "normal" vital signs can be deceptive. Tachycardia should always be investigated.

Q: What is the minimum percentage difference in weight between twins to diagnose twin discordance, considering the larger twin as the index?

20%. **Explanation:** **Twin discordance** refers to a significant size disparity between twins in a multiple pregnancy. It is a critical clinical marker because it increases the risk of perinatal morbidity and mortality, particularly for the smaller twin. **Why 20% is the Correct Answer:** The standard clinical definition for twin discordance is a **birth weight difference of 20% or more**. This is calculated using the larger twin as the index (denominator) to determine the percentage lag of the smaller twin. The formula used is: *[(Weight of larger twin – Weight of smaller twin) / Weight of larger twin] × 100.* While some older literature mentioned 15% and some severe cases are defined at 25%, the **ACOG (American College of Obstetricians and Gynecologists)** and most standard textbooks (like Williams Obstetrics) recognize **20%** as the threshold for diagnosis. **Analysis of Incorrect Options:** * **15% (Options A & B):** While a 15% difference may warrant closer monitoring, it is generally considered within the range of biological variation and does not meet the formal diagnostic criteria for discordance. * **25% (Option D):** A 25% difference is considered "severe discordance" and is associated with a significantly higher risk of fetal demise, but it is not the *minimum* percentage required for the initial diagnosis. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Cause:** In dizygotic twins, it is usually due to genetic potential or placental insufficiency. In monochorionic twins, it is often due to **TTTS (Twin-to-Twin Transfusion Syndrome)** or selective fetal growth restriction (sFGR). * **Ultrasound Diagnosis:** Antenatally, discordance is suspected if there is a **20% difference in Estimated Fetal Weight (EFW)** or an abdominal circumference (AC) difference of >20 mm. * **Monochorionic vs. Dichorionic:** Discordance is more dangerous in monochorionic twins due to shared placental vasculature.

Q: A 28-week pregnant multigravida with preeclampsia presented with fulminant signs. An urgent C-section was planned. What is the best method for the diagnosis of lung maturity?

Phosphatidyl glycerol estimation in amniotic fluid. **Explanation:** The assessment of fetal lung maturity (FLM) is crucial in high-risk pregnancies like severe preeclampsia where preterm delivery is indicated. **Why Phosphatidylglycerol (PG) is the correct answer:** Phosphatidylglycerol is a minor constituent of surfactant that appears late in gestation (usually after **35 weeks**). Its presence is a highly specific indicator of pulmonary maturity. The primary clinical advantage of PG estimation is that its validity is **not affected by contamination** with blood, meconium, or vaginal secretions. In a fulminant case requiring urgent C-section, where amniotic fluid may be contaminated during collection, PG remains the most reliable diagnostic marker. **Analysis of Incorrect Options:** * **L/S Ratio (Lecithin/Sphingomyelin):** While an L/S ratio >2.0 generally indicates maturity, it is highly sensitive to contamination. Blood or meconium can falsely alter the ratio, making it less reliable in emergency or complicated presentations. * **Bilirubin in Amniotic Fluid:** This is measured via spectrophotometry ($\Delta OD_{450}$) primarily to assess the severity of **Rh isoimmunization** and fetal hemolysis, not lung maturity. * **Amniotic Fluid Creatinine:** This was historically used to estimate **fetal renal maturity** and muscle mass (values >2 mg/dL suggest a term fetus), but it is an indirect and unreliable marker for lung maturity. **Clinical Pearls for NEET-PG:** * **Gold Standard:** L/S ratio is often cited as the traditional gold standard, but **PG** is the most specific. * **Diabetes Mellitus:** In diabetic pregnancies, the L/S ratio may be >2.0, yet the fetus can still develop RDS. Therefore, the presence of **PG** is mandatory to confirm maturity in diabetic mothers. * **Lamellar Body Count:** A rapid, modern automated test; a count >30,000–50,000/µL indicates maturity.

Q: A 28-year-old female presents with a 6-week history of amenorrhea and abdominal pain. Ultrasound reveals fluid in the pouch of Douglas. Aspiration yields dark blood that fails to clot. What is the most probable diagnosis?

Ruptured ectopic pregnancy. ### Explanation **Correct Answer: B. Ruptured ectopic pregnancy** The clinical triad of **amenorrhea, abdominal pain, and vaginal bleeding** in a reproductive-age woman is highly suggestive of an ectopic pregnancy. The ultrasound finding of fluid in the Pouch of Douglas (POD) indicates hemoperitoneum. The definitive diagnostic clue here is the aspiration of **dark, non-clotting blood** via culdocentesis. This occurs because the blood has been present in the peritoneal cavity for some time, leading to **defibrination** (lysis of fibrin by the pelvic peritoneum), which prevents it from clotting. **Why the other options are incorrect:** * **A. Ruptured ovarian cyst:** While this can cause acute pain and fluid in the POD, it usually presents with serous fluid or fresh blood (which may clot) and is less likely to be associated with a history of amenorrhea. * **C. Red degeneration of fibroid:** This typically occurs during the second or third trimester of pregnancy due to rapid growth and ischemia. It presents with localized pain and tenderness over the fibroid, not with hemoperitoneum or non-clotting blood in the POD. * **D. Pelvic abscess:** Aspiration would yield **pus** (purulent fluid) rather than blood. Patients usually present with high-grade fever, leucocytosis, and signs of pelvic inflammatory disease (PID). **High-Yield Clinical Pearls for NEET-PG:** * **Culdocentesis:** Aspiration of non-clotting blood from the POD is a classic (though now less frequently used) sign of ruptured ectopic pregnancy. * **Most common site:** The **Ampulla** of the fallopian tube is the most common site for ectopic pregnancy. * **Most common site for rupture:** The **Isthmus** (due to its narrow lumen, it ruptures early, around 6–8 weeks). * **Gold Standard Diagnosis:** Transvaginal Ultrasound (TVS) combined with quantitative β-hCG levels (Discriminatory zone: 1500–2000 mIU/mL).

Q: A 35-week pregnant patient presents with hydramnios and marked respiratory distress. What is the most appropriate management?

Amniocentesis. **Explanation:** The patient presents with **acute/symptomatic polyhydramnios** at 35 weeks gestation. When hydramnios causes maternal compromise—specifically **marked respiratory distress** or severe abdominal pain—the primary goal is to relieve the intra-abdominal pressure to stabilize the mother. **Why Amniocentesis is correct:** **Therapeutic Amniocentesis (Amnioreduction)** is the treatment of choice for symptomatic relief. By slowly removing excess amniotic fluid (usually 500 mL per hour, up to 1.5–2 L), the pressure on the diaphragm is reduced, immediately improving respiratory function. It is preferred over delivery at 35 weeks if the primary issue is mechanical distress, as it allows the pregnancy to gain further maturity while alleviating symptoms. **Why other options are incorrect:** * **A. Intravenous Furosemide:** Hydramnios is an accumulation of fluid in the amniotic sac, not maternal pulmonary edema or systemic fluid overload. Diuretics do not reduce amniotic fluid volume. * **B. Saline Infusion:** This would be used for oligohydramnios (amnioinfusion) or maternal dehydration; it would worsen the volume status in this context. * **D. Artificial Rupture of Membranes (ARM):** Performing ARM in a patient with polyhydramnios and a high presenting part carries a massive risk of **cord prolapse** and **abruptio placentae** due to the sudden decompression of the uterus. **NEET-PG High-Yield Pearls:** * **Definition:** Polyhydramnios is defined as an Amniotic Fluid Index (AFI) > 25 cm or a Single Deepest Pocket (SDP) > 8 cm. * **Indomethacin:** Can be used for medical management (decreases fetal urine output) but is generally avoided after **32 weeks** due to the risk of premature closure of the *ductus arteriosus*. * **Complication Risk:** Always perform amnioreduction slowly to prevent placental abruption.

Q: What is the most common symptom of an ectopic pregnancy?

Pain in the lower abdomen. **Explanation:** The classic clinical triad of ectopic pregnancy consists of **amenorrhea, abdominal pain, and vaginal bleeding**. However, this triad is present in only about 50% of cases. **1. Why "Pain in the lower abdomen" is correct:** Abdominal pain is the **most common presenting symptom**, occurring in approximately **95–99%** of patients. The pain is typically caused by the distension of the fallopian tube or peritoneal irritation from leaking blood. It is usually the first symptom that prompts a patient to seek medical attention. **2. Analysis of Incorrect Options:** * **Amenorrhea (B):** While a history of a missed period is common (75–90%), it is a *sign* or a historical finding rather than the primary *symptom* that defines the clinical presentation. Some patients may mistake early vaginal bleeding for a period, leading to a negative history of amenorrhea. * **Vaginal Bleeding (C):** This occurs in about 60–80% of cases. It is usually "scanty, dark brown (prune juice appearance), and spotting" in nature. While common, it occurs less frequently than abdominal pain. * **Fainting attack (D):** This is a sign of **ruptured ectopic pregnancy** leading to hemoperitoneum and hypovolemic shock. It is a late, life-threatening complication rather than the most common symptom of ectopic pregnancy in general. **NEET-PG High-Yield Pearls:** * **Most common site:** Fallopian tube (97%), specifically the **Ampulla** (most common overall). * **Most common site for rupture:** Isthmus (occurs early, at 6–8 weeks). * **Gold Standard Investigation:** Transvaginal Ultrasound (TVS) combined with quantitative β-hCG (Discriminatory zone: 1500–2000 mIU/mL). * **Arias-Stella Reaction:** Hypersecretory endometrium seen on curettage, suggestive of pregnancy but not specific to ectopic.

Q: In case of unstable lie of fetus, where is the placenta usually located?

Lower segment. **Explanation:** The correct answer is **Lower segment**. **1. Why the Lower Segment is Correct:** An unstable lie refers to a situation where the fetal longitudinal axis frequently changes (e.g., switching between transverse, oblique, and longitudinal) after 37 weeks of gestation. The most common anatomical cause for this is a **Placenta Previa** (placenta located in the lower uterine segment). When the placenta occupies the lower segment, it prevents the fetal head from engaging in the pelvic brim. This lack of engagement allows the fetus excessive mobility, leading to an unstable or transverse lie. **2. Why Other Options are Incorrect:** * **Cornual, Lateral wall, and Fundus:** These are all locations within the **upper uterine segment**. A placenta located in the upper segment is considered normal and does not obstruct the pelvic inlet. In these cases, the fetal head can easily engage, which typically stabilizes the fetus into a longitudinal lie (usually cephalic) as term approaches. **3. Clinical Pearls for NEET-PG:** * **Definition:** Unstable lie is only diagnosed after **37 weeks**; before this, it is common due to relatively high liquor volume. * **Management:** If an unstable lie persists at term, the primary goal is to exclude placenta previa via ultrasound. * **Risk:** The most dangerous complication of an unstable lie with ruptured membranes is **Cord Prolapse**. * **Other Causes:** Apart from placenta previa, consider pelvic tumors (fibroids), polyhydramnios, grand multiparity, and uterine anomalies (e.g., arcuate or subseptate uterus).

Question 1

What is the earliest indication of concealed acute bleeding in pregnancy?

Accepted Answer

Tachycardia

Answer

Oliguria

Answer

Postural hypotension

Answer

Low body temperature

Question 2

What is the minimum percentage difference in weight between twins to diagnose twin discordance, considering the larger twin as the index?

Accepted Answer

20%

Answer

15%

Answer

15%

Answer

25%

Question 3

A 28-week pregnant multigravida with preeclampsia presented with fulminant signs. An urgent C-section was planned. What is the best method for the diagnosis of lung maturity?

Accepted Answer

Phosphatidyl glycerol estimation in amniotic fluid

Answer

L/S ratio in amniotic fluid

Answer

Bilirubin in amniotic fluid

Answer

Amniotic fluid creatinine

Question 4

A 28-year-old female presents with a 6-week history of amenorrhea and abdominal pain. Ultrasound reveals fluid in the pouch of Douglas. Aspiration yields dark blood that fails to clot. What is the most probable diagnosis?

Accepted Answer

Ruptured ectopic pregnancy

Answer

Ruptured ovarian cyst

Answer

Red degeneration of fibroid

Answer

Pelvic abscess

Question 5

A 24-year-old woman is pregnant at 14 weeks with her first baby. She feels well and the pregnancy is uncomplicated. Routine screening is positive for chronic viral hepatitis for which perinatal transmission is of major epidemiologic significance. For this patient, what is the most likely viral agent?

Accepted Answer

Hepatitis B virus

Answer

Hepatitis A virus

Answer

Hepatitis C virus

Answer

Hepatitis D virus

Question 6

A 35-week pregnant patient presents with hydramnios and marked respiratory distress. What is the most appropriate management?

Accepted Answer

Amniocentesis

Answer

Intravenous furosemide

Answer

Saline infusion

Answer

Artificial rupture of membranes

Question 7

A 37-week pregnant woman presents with bleeding per vaginam. Investigations reveal a severe degree of placenta previa. What is the appropriate management?

Accepted Answer

Immediate Cesarean section

Answer

Blood transfusion

Answer

Conservative management

Answer

Medical induction of labor

Question 8

Which one of the following fetal functions is the last to be affected?

Accepted Answer

Tone

Answer

Movement

Answer

Heart rate reactivity

Answer

Breathing movements

Question 9

What is the most common symptom of an ectopic pregnancy?

Accepted Answer

Pain in the lower abdomen

Answer

Amenorrhea

Answer

Vaginal bleeding

Answer

Fainting attack

Question 10

In case of unstable lie of fetus, where is the placenta usually located?

Accepted Answer

Lower segment

Answer

Cornual

Answer

Lateral wall

Answer

Fundus

Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine — MCQs

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