Maternal-Fetal Medicine Practice Questions

Q: A 32-week pregnant patient presents with antepartum hemorrhage (APH). Her vital signs are unstable with a blood pressure of 80/60 mmHg. What is the next immediate management step?

Blood transfusion. ### Explanation **Correct Option: B. Blood Transfusion** In any case of Antepartum Hemorrhage (APH), the **initial priority is always maternal stabilization** (ABC: Airway, Breathing, and Circulation). This patient is hemodynamically unstable, as evidenced by a blood pressure of 80/60 mmHg, indicating significant hypovolemia. Before considering the mode of delivery or fetal status, the mother's intravascular volume must be restored to prevent hemorrhagic shock and multi-organ failure. Blood transfusion (along with aggressive crystalloid resuscitation) is the immediate step to stabilize the mother. **Why other options are incorrect:** * **A. Careful observation:** This is contraindicated in an unstable patient. Observation is only appropriate for stable patients with minor bleeding (Expectant management/Macafee-Johnson protocol). * **C. Medical induction of labor:** Induction is a secondary consideration. You cannot induce a patient who is in shock; stabilization must come first. * **D. Immediate cesarean section:** While a C-section may be necessary (especially in cases of Abruptio Placentae or Placenta Previa), performing surgery on a hypotensive, unstable patient significantly increases maternal mortality. The patient must be resuscitated *while* preparing for the theater. **High-Yield Clinical Pearls for NEET-PG:** * **The Golden Rule of APH:** "Resuscitate the mother first, then assess the fetus." * **Macafee-Johnson Protocol:** Used for expectant management in preterm stable patients ( 30 ml/hr and Hematocrit >30%.

Q: A 38-year-old pregnant woman is admitted to the emergency department with severe vaginal bleeding. Ultrasound examination confirms the initial diagnosis of ectopic pregnancy. Which of the following is the most common site of an ectopic pregnancy?

Uterine tubes. **Explanation:** **1. Why the Correct Answer is Right:** An ectopic pregnancy occurs when a fertilized ovum implants outside the normal uterine cavity. The **uterine (fallopian) tubes** are the most common site, accounting for approximately **95–98%** of all ectopic pregnancies. Within the tube, the **ampulla** is the most frequent specific site (approx. 70%), followed by the isthmus (12%), fimbria (11%), and interstitial/cornual portion (2%). The high frequency in the tubes is due to delayed transport of the zygote, often caused by previous pelvic inflammatory disease (PID), tubal surgery, or anatomical distortions. **2. Why the Incorrect Options are Wrong:** * **B. Cervix:** Cervical pregnancy is rare (<1%). It is associated with high morbidity due to the risk of massive hemorrhage, as the cervix is highly vascular and cannot contract to stop bleeding. * **C. Mesentery of the abdominal wall:** This refers to an abdominal pregnancy (approx. 1%). While rare, it can be primary or secondary (following tubal rupture) and is associated with high maternal mortality. * **D. Lower part of uterine body overlapping the internal cervical os:** This describes **Placenta Previa**, not an ectopic pregnancy. In placenta previa, the implantation is within the uterus but in an abnormally low position. **3. Clinical Pearls for NEET-PG:** * **Most common site overall:** Ampulla of the Fallopian tube. * **Most common site for rupture:** Isthmus (due to its narrow lumen; usually occurs at 6–8 weeks). * **Most dangerous tubal site:** Interstitial/Cornual (rupture occurs later at 12–14 weeks and causes massive hemorrhage). * **Classic Triad:** Amenorrhea, abdominal pain, and vaginal bleeding (present in only 50% of cases). * **Gold Standard Diagnosis:** Transvaginal Ultrasound (TVUS) + Serum β-hCG (Correlation with the "Discriminatory Zone").

Q: Which of the following statements regarding placenta previa is false?

Associated with painful vaginal bleeding. **Explanation:** The hallmark of **Placenta Previa** is **painless, causeless, and recurrent** vaginal bleeding. This occurs because, as the lower uterine segment stretches and the cervix begins to efface in the third trimester, the placental attachments are disrupted, leading to bleeding from the maternal venous sinuses. In contrast, **painful** vaginal bleeding is the classic presentation of **Abruptio Placentae**, where the pain results from extravasation of blood into the myometrium (Couvelaire uterus) and uterine contractions. **Analysis of Options:** * **Option A (True):** Bleeding typically occurs in the late 2nd or early 3rd trimester (the "warning hemorrhage") as the lower uterine segment forms. * **Option C (True):** **Transvaginal Ultrasound (TVS)** is the gold standard and investigation of choice. It is safe and more accurate than transabdominal scans for measuring the distance between the internal os and the placental edge. * **Option D (True):** Risk factors include advanced maternal age, multiparity, prior Cesarean sections, smoking, and prior curettage. **Clinical Pearls for NEET-PG:** * **Stallworthy’s Sign:** A drop in fetal heart rate when the fetal head is pressed into the pelvic inlet, suggestive of posterior placenta previa. * **Management:** If the patient is stable and <37 weeks, **MacAfee & Johnson (Expectant) management** is followed. * **Contraindication:** **Digital vaginal examination** is strictly contraindicated unless the patient is in the operation theater prepared for an immediate Cesarean section (Double Setup Examination), as it can provoke torrential hemorrhage.

Q: A 31-year-old primigravid woman, known to be HIV positive, is seeking prenatal care. She also has asthma, for which she uses an inhaler. She had a diagnostic laparoscopy at age 20 for pelvic pain and has had no other surgeries. She has no known drug allergies. Counseling regarding vertical transmission of HIV to the fetus is provided. It is recommended that she take antiretroviral therapy during pregnancy to decrease the vertical transmission rate and have a scheduled cesarean delivery. After consideration, the patient chooses not to take antiretrovirals and opts for a vaginal delivery. What is the approximate risk of vertical transmission of HIV (from mother to fetus) for this patient?

25%. **Explanation:** The risk of vertical transmission of HIV depends significantly on the viral load and the interventions undertaken during pregnancy, labor, and the neonatal period. **Why 25% is correct:** In the absence of any medical intervention—meaning the mother is **not** on Antiretroviral Therapy (ART), does **not** receive intrapartum Zidovudine, and undergoes a **vaginal delivery**—the risk of mother-to-child transmission (MTCT) is approximately **25%** (ranging from 15% to 30%). Transmission can occur in utero (5-10%), during delivery (10-20%), or via breastfeeding (additional 5-20%). Since this patient refused ART and opted for a vaginal delivery, she falls into this high-risk category. **Analysis of Incorrect Options:** * **A (2%):** This is the risk when the viral load is undetectable (<50 copies/mL) due to highly active antiretroviral therapy (HAART) and appropriate obstetric management. * **B (8%):** This represents the reduced risk if only a single intervention is used (e.g., Zidovudine monotherapy or scheduled Cesarean section alone without ART). * **D (50%):** This is an overestimation. Even without treatment, the majority of infants born to HIV-positive mothers do not contract the virus. **NEET-PG High-Yield Pearls:** * **Most common timing:** Most vertical transmission occurs **intrapartum** (during labor and delivery). * **Gold Standard:** The goal is a viral load of ** 1000 copies/mL** at 38 weeks, a **Scheduled Cesarean Section** is recommended to reduce transmission. * **Breastfeeding:** In resource-rich settings, breastfeeding is contraindicated. In resource-limited settings (per WHO), exclusive breastfeeding with maternal ART is recommended if safe alternatives are unavailable.

Q: Fetal blood loss is most commonly seen in which placental abnormality?

Vasa previa. **Explanation:** **Vasa previa** is the correct answer because it involves fetal vessels (umbilical arteries or veins) running through the membranes, unprotected by placental tissue or the umbilical cord, across the internal os of the cervix. When the membranes rupture (spontaneous or artificial), these vessels are easily lacerated. Since the blood within these vessels is entirely **fetal in origin**, even a small amount of bleeding can lead to rapid fetal exsanguination and death. **Analysis of Incorrect Options:** * **Decidua basalis:** This is the maternal component of the placenta. Bleeding here (as seen in placental abruption) is primarily **maternal blood**, though it can lead to fetal distress due to hypoxia. * **Battledore placenta (Marginal insertion):** The cord inserts at the margin of the placenta rather than the center. While it increases the risk of preterm labor, it rarely causes direct fetal vessel rupture unless associated with vasa previa. * **Succenturiate placenta:** This refers to one or more accessory lobes connected to the main placenta by vascular bridges. While it is a **major risk factor** for vasa previa, the presence of the lobe itself does not cause blood loss unless the connecting vessels cross the internal os and rupture. **Clinical Pearls for NEET-PG:** * **Classic Presentation:** Painless vaginal bleeding immediately following the Rupture of Membranes (ROM) accompanied by sudden **fetal bradycardia** or a sinusoidal heart rate pattern. * **Apt Test / Ogita Test:** Used to differentiate fetal hemoglobin (HbF) from maternal hemoglobin (HbM) in vaginal blood. * **Management:** If diagnosed prenatally via Doppler USG, an elective Cesarean section is planned at 34–35 weeks to avoid labor and membrane rupture.

Q: At which gestational age does surfactant typically appear in amniotic fluid?

28 weeks. **Explanation:** The production of pulmonary surfactant is a critical milestone in fetal lung maturity. Surfactant is a phospholipid-protein complex produced by **Type II pneumocytes** that reduces surface tension in the alveoli, preventing collapse during expiration. **Why 28 weeks is correct:** While surfactant synthesis begins internally around 20–24 weeks, it is only by **28 weeks** that it is secreted into the alveolar lumen in sufficient quantities to be detectable in the **amniotic fluid**. This marks the transition where the fetus reaches a significant threshold of viability, as the lungs become capable of gas exchange with medical support. **Analysis of Incorrect Options:** * **20 weeks:** This is when Type II pneumocytes begin to differentiate and start producing surfactant internally, but it is not yet secreted into the amniotic fluid. * **32 weeks:** At this stage, surfactant levels are increasing significantly, but the initial appearance occurs much earlier (at 28 weeks). By **34–35 weeks**, surfactant levels (specifically Lecithin) rise sharply, indicating mature lungs. * **4 weeks:** This is the embryonic period when the lung bud first appears; specialized alveolar cells have not yet developed. **NEET-PG High-Yield Pearls:** * **L/S Ratio:** A Lecithin/Sphingomyelin ratio of **>2:1** (usually achieved by 35 weeks) indicates fetal lung maturity. * **Phosphatidylglycerol (PG):** Its presence is the most reliable indicator of lung maturity, especially in diabetic mothers. * **Glucocorticoids:** Administered to the mother (e.g., Betamethasone) between 24–34 weeks to accelerate surfactant production by inducing enzymes in Type II pneumocytes.

Q: Which of the following sites are the rarest and most common for ectopic pregnancy, respectively?

Cervix and ampulla of fallopian tube. **Explanation:** Ectopic pregnancy occurs when a fertilized ovum implants outside the normal uterine cavity. Understanding the distribution of these sites is a high-yield topic for NEET-PG. **1. Why Option C is Correct:** * **Most Common Site:** The **Fallopian tube** accounts for approximately 95–97% of all ectopic pregnancies. Within the tube, the **Ampulla** is the most frequent site (approx. 70%) due to its wide lumen and mucosal folds where fertilization typically occurs. * **Rarest Site:** The **Cervix** is considered the rarest site of implantation, occurring in <1% of cases. It is clinically significant due to the high risk of massive hemorrhage during management. **2. Analysis of Incorrect Options:** * **Option A:** While the Ampulla is the most common, the Ovary (approx. 3%) is more common than the cervix. * **Option B:** The Isthmus is the second most common tubal site (approx. 12%), but not the most common overall. The Broad ligament (intraligamentary) is rare but usually occurs secondary to tubal rupture. * **Option D:** Abdominal pregnancies (approx. 1%) are rare but still occur more frequently than cervical pregnancies in most epidemiological studies. **3. NEET-PG Clinical Pearls:** * **Order of Frequency in Fallopian Tube:** Ampulla (70%) > Isthmus (12%) > Fimbria (11%) > Interstitial/Cornual (2–3%). * **Highest Risk of Rupture:** The **Isthmus** tends to rupture early (6–8 weeks) because it is narrow and non-distensible. * **Most Dangerous Site:** **Interstitial/Cornual** pregnancies are the most dangerous because they rupture late (12–14 weeks) and cause massive, life-threatening hemorrhage due to the proximity of the uterine artery. * **Classic Triad:** Amenorrhea, abdominal pain, and vaginal bleeding (present in only 50% of cases).

Q: Amniotic fluid volume in polyhydramnios is more than:

2000ml. **Explanation:** **Polyhydramnios** is defined as a pathological increase in amniotic fluid volume during pregnancy. By standard clinical definition, polyhydramnios occurs when the total volume of amniotic fluid exceeds **2000 ml** at any point during gestation. 1. **Why 2000 ml is correct:** Amniotic fluid volume increases progressively until 34–36 weeks, peaking at approximately 800–1000 ml. A volume exceeding 2000 ml is considered abnormal and is associated with maternal complications (like respiratory distress or preterm labor) and fetal anomalies (like esophageal atresia or neural tube defects). 2. **Why other options are incorrect:** * **500 ml:** This is within the normal range for mid-pregnancy. A volume below 200 ml is termed oligohydramnios. * **1000 ml:** This represents the physiological peak of amniotic fluid at 36 weeks; it is the upper limit of normal, not polyhydramnios. * **1500 ml:** While this is an excessive amount, it does not meet the formal diagnostic threshold of 2000 ml used in obstetric textbooks (e.g., Williams Obstetrics, Dutta). **High-Yield Clinical Pearls for NEET-PG:** * **Sonographic Diagnosis:** Polyhydramnios is diagnosed via ultrasound if the **Amniotic Fluid Index (AFI) is >25 cm** or the **Single Deepest Pocket (SDP) is >8 cm**. * **Most Common Cause:** Idiopathic (50–60%), followed by maternal diabetes and fetal structural anomalies. * **Complications:** Malpresentation, cord prolapse, placental abruption (due to sudden decompression), and Postpartum Hemorrhage (PPH) due to uterine atony. * **Management:** Therapeutic amniocentesis (amniodrainage) or Indomethacin (which decreases fetal urine production) may be used in severe cases.

Q: Which of the following measures the amount of fetal blood entering maternal circulation?

Kleihauer-Betke test. ### Explanation **1. Why Kleihauer-Betke (KB) Test is Correct:** The **Kleihauer-Betke test** is the gold standard for quantifying the volume of **fetal-maternal hemorrhage (FMH)**. It relies on the principle that **Fetal Hemoglobin (HbF)** is resistant to acid elution, whereas Adult Hemoglobin (HbA) is not. When a maternal blood smear is treated with an acid buffer, HbA is leached out of the adult cells (leaving them as "ghost cells"), while HbF remains intact. The percentage of fetal cells is then used to calculate the required dose of **Anti-D immunoglobulin** to prevent Rh isoimmunization. **2. Analysis of Incorrect Options:** * **B. Singer’s Test:** This is a chemical method (alkali denaturation) used to estimate the percentage of HbF in a blood sample, but it is not used to quantify fetal cells in maternal circulation for FMH. * **C. APT Test:** This is a qualitative test used to differentiate fetal blood from maternal blood in cases of **antepartum hemorrhage** (e.g., vasa previa) or neonatal gastric aspirate (to see if the baby swallowed maternal blood during delivery). It uses NaOH; fetal blood stays pink, while maternal blood turns yellow-brown. * **D. Benedict Test:** This is a classic biochemistry test used to detect **reducing sugars** (like glucose) in the urine. **3. High-Yield Clinical Pearls for NEET-PG:** * **Formula for Anti-D:** Volume of FMH (mL) = % of fetal cells × 50. One 300 mcg vial of Anti-D covers **30 mL** of fetal whole blood (or 15 mL of fetal RBCs). * **Screening vs. Quantification:** The **Rosette Test** is the initial *qualitative* screening test for FMH. If positive, the KB test is performed for *quantification*. * **False Positives:** Conditions with high maternal HbF (e.g., Beta-thalassemia trait, Sickle cell anemia, or Hereditary Persistence of Fetal Hemoglobin) can cause a false-positive KB test.

Question 1

A 32-week pregnant patient presents with antepartum hemorrhage (APH). Her vital signs are unstable with a blood pressure of 80/60 mmHg. What is the next immediate management step?

Accepted Answer

Blood transfusion

Answer

Careful observation

Answer

Medical induction of labor

Answer

Immediate cesarean section

Question 2

A 38-year-old pregnant woman is admitted to the emergency department with severe vaginal bleeding. Ultrasound examination confirms the initial diagnosis of ectopic pregnancy. Which of the following is the most common site of an ectopic pregnancy?

Accepted Answer

Uterine tubes

Answer

Cervix

Answer

Mesentery of the abdominal wall

Answer

Lower part of uterine body overlapping the internal cervical os

Question 3

Which of the following statements regarding placenta previa is false?

Accepted Answer

Associated with painful vaginal bleeding

Answer

Presents commonly in the 3rd trimester

Answer

Ultrasound is the investigation of choice

Answer

Increased maternal age is a risk factor

Question 4

A 31-year-old primigravid woman, known to be HIV positive, is seeking prenatal care. She also has asthma, for which she uses an inhaler. She had a diagnostic laparoscopy at age 20 for pelvic pain and has had no other surgeries. She has no known drug allergies. Counseling regarding vertical transmission of HIV to the fetus is provided. It is recommended that she take antiretroviral therapy during pregnancy to decrease the vertical transmission rate and have a scheduled cesarean delivery. After consideration, the patient chooses not to take antiretrovirals and opts for a vaginal delivery. What is the approximate risk of vertical transmission of HIV (from mother to fetus) for this patient?

Accepted Answer

25%

Answer

2%

Answer

8%

Answer

50%

Question 5

Fetal blood loss is most commonly seen in which placental abnormality?

Accepted Answer

Vasa previa

Answer

Decidua basalis

Answer

Battledore placenta

Answer

Succenturiate placenta

Question 6

At which gestational age does surfactant typically appear in amniotic fluid?

Accepted Answer

28 weeks

Answer

20 weeks

Answer

32 weeks

Answer

4 weeks

Question 7

Which of the following sites are the rarest and most common for ectopic pregnancy, respectively?

Accepted Answer

Cervix and ampulla of fallopian tube

Answer

Ovary and ampulla of fallopian tube

Answer

Broad ligament and isthmus of fallopian tube

Answer

Abdomen and isthmus of fallopian tube

Question 8

Amniotic fluid volume in polyhydramnios is more than:

Accepted Answer

2000ml

Answer

500ml

Answer

1000ml

Answer

1500ml

Question 9

Which of the following measures the amount of fetal blood entering maternal circulation?

Accepted Answer

Kleihauer-Betke test

Answer

Singers test

Answer

APT test

Answer

Benedict test

Question 10

Which of the following is NOT considered a high-risk factor for gestational hypertension?

Accepted Answer

Polyhydramnios

Answer

Blood pressure of 150/100 mm Hg

Answer

Gestation age less than 30 weeks

Answer

Intrauterine growth restriction (IUGR)

Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine — MCQs

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