Maternal-Fetal Medicine Practice Questions

Q: What predicted beta-hCG levels are indicative of an ectopic pregnancy?

1500 mIU/mL. The correct answer is **1500 mIU/mL**. ### **Explanation of the Correct Answer** The core concept here is the **Discriminatory Zone (DZ)**. This is the threshold level of serum beta-hCG above which a normal intrauterine pregnancy (IUP) should consistently be visible via transvaginal sonography (TVS). * According to the **ACOG guidelines** and standard textbooks (Williams Obstetrics), the most widely accepted discriminatory zone is **1500 to 2000 mIU/mL**. * If the beta-hCG is above 1500 mIU/mL and the uterus is empty on TVS, the clinician must highly suspect an **ectopic pregnancy** or a non-viable IUP. ### **Analysis of Incorrect Options** * **A (1000 mIU/mL):** This was the historical threshold for older ultrasound machines. Modern high-resolution TVS can often see a sac at this level, but it is not the standard "discriminatory" cutoff used to diagnose ectopic pregnancy. * **C & D (2000 & 2500 mIU/mL):** While some institutions use 2000 mIU/mL to increase specificity (to avoid accidental termination of a desired pregnancy), **1500 mIU/mL** remains the classic, most frequently tested "lower limit" of the discriminatory zone for NEET-PG. 2500 mIU/mL is generally considered too high for a primary diagnostic threshold. ### **Clinical Pearls for NEET-PG** 1. **Doubling Time:** In a healthy IUP, beta-hCG levels should increase by at least **35-53% every 48 hours**. A rise of less than this suggests ectopic pregnancy or miscarriage. 2. **Transabdominal Ultrasound (TAS):** The discriminatory zone for TAS is much higher, typically **6000–6500 mIU/mL**. 3. **Gold Standard Diagnosis:** While beta-hCG and TVS are the primary tools, the definitive diagnosis of ectopic pregnancy is via **laparoscopy**. 4. **Medical Management:** Methotrexate is indicated if the patient is stable, the sac is <4 cm, and beta-hCG is <5000 mIU/mL.

Q: Which of the following describes the radiographic finding of a flattened, overlapping arch of the fetal skull, indicating fetal death?

Spalding Sign. **Explanation:** **Spalding’s Sign (Option A)** is the correct answer. It refers to the overlapping of the fetal skull bones caused by the liquefaction of the brain matter and the loss of intracranial pressure following intrauterine fetal death (IUFD). This radiographic sign typically appears 4 to 7 days after fetal demise. It is a classic high-yield finding in obstetric imaging, though it has largely been replaced by ultrasound in modern practice. **Analysis of Incorrect Options:** * **Robert’s Sign (Option B):** This refers to the presence of gas (usually nitrogen) in the fetal heart and great vessels. It is one of the earliest radiological signs of fetal death, appearing as early as 12 hours after demise. * **Wood’s Sign (Option C):** This is not a standard term for fetal death. It may be confused with the "Wood’s Screw Maneuver," which is a clinical technique used to manage shoulder dystocia by rotating the posterior shoulder. * **Normal Pregnancy (Option D):** In a viable pregnancy, the fetal skull bones are well-aligned without overlapping, maintained by normal intracranial pressure and brain volume. **Clinical Pearls for NEET-PG:** * **Earliest Sign of IUFD on X-ray:** Robert’s Sign (Gas in the circulatory system). * **Most Reliable Sign of IUFD:** Absence of fetal heart activity on Real-time Ultrasound (M-mode). * **Deuel’s Halo Sign:** Another sign of IUFD, characterized by the elevation of the scalp soft tissues (edema) creating a "halo" appearance around the fetal skull. * **Spalding’s Sign Caution:** It can occasionally be seen in a living fetus during labor when the head is deeply engaged and undergoing significant molding.

Q: What is the single best parameter to assess fetal well-being?

Biophysical profile. The **Biophysical Profile (BPP)** is the gold standard for assessing acute and chronic fetal well-being because it combines multiple dynamic parameters to evaluate the integrity of the fetal central nervous system. ### **Why Biophysical Profile (D) is correct:** The BPP evaluates five parameters: **Fetal breathing movements, Fetal tone, Gross body movements, Amniotic fluid volume, and the Non-Stress Test (NST).** * **Acute markers** (Breathing, Tone, Movement, NST) reflect the immediate oxygenation of the fetal brain. * **Chronic markers** (Amniotic fluid) reflect long-term placental perfusion. Because it assesses both immediate neurological status and placental reserve, it is the most reliable predictor of fetal health and the risk of intrauterine death. ### **Why other options are incorrect:** * **Femur Length (A):** This is a biometric parameter used primarily to assess gestational age and skeletal growth, not acute well-being. * **Abdominal Circumference (B):** While this is the most sensitive indicator for **fetal growth restriction (IUGR)** and nutritional status (liver glycogen stores), it does not provide a real-time assessment of fetal hypoxia or distress. * **Head Circumference (C):** This is used for dating and monitoring brain growth but does not reflect the current physiological state of the fetus. ### **High-Yield Clinical Pearls for NEET-PG:** * **Manning’s Score:** The BPP is scored out of 10. A score of **8-10 is normal**, while **0-2 indicates certain fetal asphyxia** and requires immediate delivery. * **Modified BPP:** Consists of only the **NST** (acute) and **Amniotic Fluid Index** (chronic). It is as predictive as the full BPP. * **Sequence of Loss:** In fetal hypoxia, the first parameter to disappear is the **NST (reactivity)**, followed by breathing, and finally fetal tone (the last to disappear).

Q: All of the following are true of placenta previa except?

Premature labor is common.. **Explanation:** Placenta previa occurs when the placenta implants in the lower uterine segment, partially or completely covering the internal os. **Why Option C is the correct answer (The False Statement):** Contrary to common belief, **premature labor is actually infrequent** in placenta previa. While "preterm delivery" is very common, it is usually **iatrogenic** (physician-induced) due to heavy bleeding necessitating emergency delivery, rather than spontaneous onset of labor. The lower segment is passive, and the presence of the placenta there does not typically trigger the biochemical cascade of labor. **Analysis of Incorrect Options (True Statements):** * **Option A:** Postpartum hemorrhage (PPH) is a major risk. The lower uterine segment is less muscular and lacks the "living ligatures" (interlocking muscle fibers) found in the fundus. Consequently, it cannot contract effectively to compress vessels after placental separation. * **Option B:** While the classic presentation is painless bleeding in the third trimester (warning hemorrhage), early "threatened abortion" or first-trimester spotting is not uncommon due to the low implantation. * **Option C:** There is a strong correlation between a scarred uterus (previous LSCS or myomectomy) and placenta previa. The risk increases linearly with the number of previous cesarean sections. **NEET-PG High-Yield Pearls:** * **Classic Presentation:** Painless, causative, recurrent, bright red vaginal bleeding. * **Stallworthy’s Sign:** Posterior placenta previa prevents the head from engaging, causing the fetal heart rate to drop when the head is pushed into the pelvis (due to cord compression). * **Investigation of Choice:** Transvaginal Ultrasound (TVS) is the gold standard (safer and more accurate than transabdominal). * **Contraindication:** **Never** perform a per-vaginal (PV) examination in a suspected case of placenta previa, as it can provoke torrential hemorrhage.

Q: What is the most common cause of multiple fetal anomalies?

Rubella. **Explanation:** **Rubella (German Measles)** is the correct answer because it is a potent teratogen known for causing **Congenital Rubella Syndrome (CRS)**. When infection occurs during the first trimester (the period of organogenesis), the virus causes chronic focal destruction of developing cells, leading to a classic triad of anomalies: **Cataracts, Sensorineural deafness, and Congenital Heart Disease** (most commonly Patent Ductus Arteriosus). Because it affects multiple organ systems simultaneously (eyes, ears, heart, and CNS), it is the most common infectious cause of multiple fetal anomalies. **Why other options are incorrect:** * **Syphilis:** Caused by *Treponema pallidum*, it typically presents with features like snuffles, Hutchinson’s teeth, and hepatosplenomegaly. However, it is generally considered a "late" fetal infection (usually manifesting after the 16th week) rather than a cause of early structural malformations. * **Tetracycline:** This is a drug-induced teratogen. Its primary effect is localized to the **calcification of teeth** (discoloration) and inhibition of bone growth. It does not typically cause a wide spectrum of "multiple" structural anomalies. * **Rubeola (Measles):** While it can cause maternal morbidity and is associated with an increased risk of miscarriage or preterm labor, the Rubeola virus is **not teratogenic** and does not cause structural fetal malformations. **High-Yield Clinical Pearls for NEET-PG:** * **Gregg’s Triad:** Cataract, Deafness, and Cardiac defects (PDA). * **Timing:** The risk of fetal malformation is highest (up to 80%) if the infection occurs within the first 12 weeks of gestation. * **Blueberry Muffin Rash:** A characteristic neonatal presentation of CRS due to extramedullary hematopoiesis. * **Vaccination:** Rubella is a live attenuated vaccine (RA 27/3); it is **contraindicated during pregnancy**, and pregnancy should be avoided for 1 month post-vaccination.

Q: A 15 cms X 15 cms ovarian cyst has been diagnosed in an 8-week pregnant lady. What is the recommended further management?

Laparotomy at 14-16 weeks. ### Explanation **1. Why Option B is Correct:** The management of an ovarian cyst in pregnancy depends on its size, symptoms, and gestational age. A cyst measuring **15 cm** is considered large (typically >6 cm is the threshold for concern). Large cysts carry a high risk of **torsion, rupture, or labor obstruction**. The ideal time for surgery is the **early second trimester (14–16 weeks)** because: * **Organogenesis is complete**, reducing teratogenic risk from anesthesia. * The **placenta has taken over progesterone production**, so removing the corpus luteum (if necessary) will not cause miscarriage. * The uterus is not yet large enough to technically hinder the surgery, unlike in the third trimester. **2. Why Other Options are Incorrect:** * **Option A:** Follow-up is only appropriate for small (<6 cm), simple, asymptomatic cysts (likely functional), which often regress. A 15 cm cyst is unlikely to regress and poses a high risk of complications. * **Option C & D:** Waiting until term or postpartum is dangerous. As the uterus grows, the risk of **adnexal torsion** increases significantly. Furthermore, a 15 cm cyst in the pelvis can cause **soft tissue dystocia**, necessitating an emergency Cesarean section, which is riskier than elective mid-trimester surgery. **3. Clinical Pearls for NEET-PG:** * **Most common ovarian cyst in pregnancy:** Corpus luteal cyst (usually regresses by 12–14 weeks). * **Most common benign tumor in pregnancy:** Mature cystic teratoma (Dermoid). * **Most common complication:** Torsion (most frequent in the 1st trimester or early puerperium). * **Surgical approach:** While laparotomy is the traditional answer, **laparoscopy** is now considered safe and preferred in the second trimester by experienced surgeons.

Q: What is the blood pressure reading in severe pregnancy-induced hypertension (PIH)?

160/110 mm Hg. **Explanation:** Pregnancy-Induced Hypertension (PIH), specifically Preeclampsia, is defined as new-onset hypertension (BP ≥140/90 mm Hg) after 20 weeks of gestation. The classification into "Severe" features is critical for clinical management and timing of delivery. **1. Why Option A is Correct:** According to ACOG and NHBPEP guidelines, **Severe Hypertension** in pregnancy is defined as a Systolic Blood Pressure (SBP) **≥160 mm Hg** and/or a Diastolic Blood Pressure (DBP) **≥110 mm Hg**, measured on two occasions at least 4 hours apart (unless antihypertensive therapy is initiated sooner). This threshold is used because pressures above this level significantly increase the risk of maternal cerebrovascular accidents (stroke) and placental abruption. **2. Analysis of Incorrect Options:** * **Option B (150/100 mm Hg):** This falls under the category of "Mild to Moderate" hypertension (SBP 140–159 or DBP 90–109 mm Hg). While abnormal, it does not meet the criteria for severe PIH. * **Option C (260/100 mm Hg):** While the systolic value is dangerously high, this is not the standard diagnostic threshold for defining the onset of severe PIH. * **Option D (120/80 mm Hg):** This represents a normal physiological blood pressure reading in a healthy adult. **3. NEET-PG High-Yield Pearls:** * **Proteinuria:** No longer mandatory for the diagnosis of Preeclampsia if other "Severe Features" (thrombocytopenia, renal insufficiency, impaired liver function, pulmonary edema, or cerebral/visual symptoms) are present. * **Drug of Choice (Acute Crisis):** Intravenous Labetalol or Hydralazine. * **Drug of Choice (Seizure Prophylaxis):** Magnesium Sulfate ($MgSO_4$) is the gold standard for preventing eclampsia in severe PIH. * **Definitive Treatment:** Delivery of the fetus and placenta.

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

Prematurity. **Explanation:** **Prematurity (Option C)** is the single most common cause of perinatal morbidity and mortality in twin gestations. Approximately 50–60% of twin pregnancies result in preterm birth (before 37 weeks), compared to only 10% in singletons. The primary driver is uterine overdistension, which triggers early labor or premature rupture of membranes (PROM). Complications arising from prematurity—such as Respiratory Distress Syndrome (RDS), intraventricular hemorrhage, and necrotizing enterocolitis—account for the majority of neonatal deaths. **Analysis of Incorrect Options:** * **Single fetal demise (Option A):** While it increases the risk of neurological damage or death in the surviving twin (especially in monochorionic twins), it is statistically less common than complications from early delivery. * **Twin-to-Twin Transfusion Syndrome (TTTS) (Option B):** This is a serious complication unique to monochorionic diamniotic (MCDA) twins. While it has a high mortality rate if untreated, it only affects about 10–15% of monochorionic pregnancies, making it less frequent than prematurity overall. * **Intrauterine Growth Restriction (IUGR) (Option D):** Twins are at higher risk for growth restriction due to placental insufficiency or unequal sharing. While IUGR increases vulnerability, prematurity remains the leading cause of death. **High-Yield Clinical Pearls for NEET-PG:** * **Average duration of pregnancy:** Singletons (40 weeks), Twins (37 weeks), Triplets (33 weeks). * **Most common complication of twins:** Prematurity. * **Most common type of twins:** Dizygotic (70-80%). * **Vanishing Twin Syndrome:** Death of one fetus in the first trimester (occurs in ~20% of twin pregnancies). * **Bed rest:** Routine hospitalization or bed rest does *not* prevent preterm labor in twins and is not recommended.

Question 1

What predicted beta-hCG levels are indicative of an ectopic pregnancy?

Accepted Answer

1500 mIU/mL

Answer

1000 mIU/mL

Answer

2000 mIU/mL

Answer

2500 mIU/mL

Question 2

Which of the following describes the radiographic finding of a flattened, overlapping arch of the fetal skull, indicating fetal death?

Accepted Answer

Spalding Sign

Answer

Robe's Sign

Answer

Wood's Sign

Answer

Normal pregnancy

Question 3

What is the single best parameter to assess fetal well-being?

Accepted Answer

Biophysical profile

Answer

Femur length

Answer

Abdominal circumference

Answer

Head circumference

Question 4

A 29-year-old primigravida in her 4th month of pregnancy has a history of juvenile myoclonic epilepsy and is regularly taking sodium valproate. She is seeking advice regarding her anti-epileptic regimen. What would you suggest?

Accepted Answer

Continue Valproate with monitoring of drug level

Answer

Immediately taper Valproate and start Lamotrigine

Answer

Switch to Carbamazepine

Answer

Add Lamotrigine

Question 5

Which of the following is a grave prognostic factor in a woman with pre-eclampsia?

Accepted Answer

Serum creatinine >1.4 mg/dL

Answer

Remission for 6 months

Answer

24-h urine protein excretion < 2.6 g

Answer

All of the above

Question 6

All of the following are true of placenta previa except?

Accepted Answer

Premature labor is common.

Answer

Postpartum hemorrhage is infrequent.

Answer

First-trimester bleeding is not uncommon.

Answer

Higher incidence in women with lower segment cesarean section.

Question 7

What is the most common cause of multiple fetal anomalies?

Accepted Answer

Rubella

Answer

Syphilis

Answer

Tetracycline

Answer

Rubeola

Question 8

A 15 cms X 15 cms ovarian cyst has been diagnosed in an 8-week pregnant lady. What is the recommended further management?

Accepted Answer

Laparotomy at 14-16 weeks

Answer

Only follow up without surgical intervention

Answer

Cesarean delivery and ovariotomy at term

Answer

Surgery after delivery

Question 9

What is the blood pressure reading in severe pregnancy-induced hypertension (PIH)?

Accepted Answer

160/110 mm Hg

Answer

150/100 mm Hg

Answer

260/100 mm Hg

Answer

120/80 mm Hg

Question 10

What is the most common cause of perinatal mortality in twins?

Accepted Answer

Prematurity

Answer

Single fetal demise

Answer

Twin to twin transfusion syndrome

Answer

Intrauterine growth restriction

Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine — MCQs

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