Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine Indian Medical PG Practice Questions and MCQs

Question 551: What is the earliest sign of uteroplacental insufficiency detected by Doppler ultrasound?

A. Diastolic notch (Correct Answer)
B. Reversal of diastolic flow
C. Blunting of systolic flow
D. Absent mid-diastolic flow

Explanation: ### Explanation **1. Why "Diastolic Notch" is correct:** The earliest sign of uteroplacental insufficiency is the persistence of the **diastolic notch** in the uterine artery waveform. In a normal pregnancy, the physiological remodeling of spiral arteries by trophoblasts (low-resistance, high-flow system) causes the diastolic notch to disappear by **20–24 weeks** of gestation. If this remodeling fails, high resistance persists, resulting in a sharp drop in blood flow at the beginning of diastole (the notch). This serves as a predictive marker for pre-eclampsia and Intrauterine Growth Restriction (IUGR). **2. Why other options are incorrect:** * **Reversal of diastolic flow (B):** This is a **late and critical sign** of fetal compromise, typically seen in the umbilical artery. It indicates severe placental resistance and impending fetal demise. * **Blunting of systolic flow (C):** This is not a standard Doppler descriptor for early insufficiency. Doppler indices focus on the relationship between systolic and diastolic velocities (like the S/D ratio). * **Absent mid-diastolic flow (D):** While "Absent End Diastolic Velocity" (AEDV) is a significant marker of worsening insufficiency, it occurs much later in the disease spectrum than the appearance of a notch. **3. Clinical Pearls for NEET-PG:** * **Uterine Artery Doppler:** Best used for **screening** high-risk pregnancies (at 20–24 weeks). * **Umbilical Artery Doppler:** Best for **monitoring** a growth-restricted fetus. * **Sequence of deterioration:** Increased S/D ratio → Absent End Diastolic Velocity (AEDV) → Reversed End Diastolic Velocity (REDV). * **Ductus Venosus:** Reversal of the 'a' wave is the most ominous sign, indicating fetal heart failure.

Question 552: Maximum exposure to HIV is seen in which period?

A. Intrapartum period (Correct Answer)
B. Breastfeeding
C. 1st Trimester
D. 3rd Trimester

Explanation: **Explanation:** The transmission of HIV from mother to child (MTCT) can occur during pregnancy, labor, or breastfeeding. However, the **intrapartum period** (during labor and delivery) carries the highest risk, accounting for approximately **60-75%** of vertical transmission in non-breastfeeding women. **1. Why Intrapartum is the Correct Answer:** The risk is maximal during labor due to: * **Micro-transfusions:** Uterine contractions force maternal blood across the placenta into fetal circulation. * **Direct Contact:** The fetus is exposed to infected maternal blood and cervicovaginal secretions in the birth canal. * **Ascending Infection:** Rupture of membranes allows the virus to reach the amniotic fluid. **2. Analysis of Incorrect Options:** * **Breastfeeding (Option B):** While it poses a significant risk (approx. 15-20% additional risk), it is cumulative over months. The concentrated exposure during the short window of labor is higher. * **1st Trimester (Option C):** Transmission is rare (approx. 1-2%) because the placental barrier is relatively thick and the viral load in the decidua is lower. * **3rd Trimester (Option D):** While transmission increases as the placenta ages and thins, it still accounts for only about 10-15% of cases compared to the intrapartum peak. **Clinical Pearls for NEET-PG:** * **Most common route of transmission:** Intrapartum. * **Most important predictor of transmission:** Maternal plasma viral load. * **Zidovudine (AZT):** The first drug proven to reduce MTCT (ACTG 076 protocol). * **Mode of Delivery:** Elective Cesarean Section (at 38 weeks) reduces risk if the viral load is >1000 copies/mL. * **Breastfeeding:** WHO recommends exclusive breastfeeding for 6 months in HIV+ mothers *only if* they are on ART; however, in resource-rich settings, replacement feeding is preferred.

Question 553: The triad of ectopic pregnancy includes all of the following EXCEPT:

A. Vomiting (Correct Answer)
B. Bleeding
C. Abdominal pain
D. Amenorrhea

Explanation: ### Explanation The classic clinical triad of **Ectopic Pregnancy** consists of **amenorrhea, abdominal pain, and vaginal bleeding**. This triad is a hallmark of early pregnancy complications and is essential for NEET-PG aspirants to recognize. **Why "Vomiting" is the Correct Answer (The Exception):** While vomiting and nausea are common symptoms of early intrauterine pregnancy (morning sickness), they are **not** part of the diagnostic triad for ectopic pregnancy. In cases of a ruptured ectopic pregnancy, a patient may experience nausea or syncope due to hemodynamic instability or peritoneal irritation, but it remains a non-specific symptom rather than a defining clinical feature. **Analysis of Incorrect Options (The Triad Components):** * **Amenorrhea (D):** Present in 75–90% of cases. It signifies an underlying pregnancy, though the duration is often short (6–8 weeks). * **Abdominal Pain (C):** The most common presenting symptom (95–100%). It is typically unilateral and pelvic, but becomes generalized and agonizing if rupture occurs. * **Vaginal Bleeding (B):** Occurs in about 70–80% of cases. It is usually "scanty, dark brown (prune juice appearance), and spotting" in nature, resulting from the breakdown of the decidua due to falling progesterone levels. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Transvaginal Ultrasound (TVS) + Serial β-hCG (Discriminatory zone: 1500–2000 mIU/ml). * **Most Common Site:** Ampulla of the Fallopian tube. * **Arias-Stella Reaction:** Hypersecretory endometrium seen on curettage; it is suggestive but not diagnostic of ectopic pregnancy. * **Classic Sign:** Adnexal tenderness and a "doughy" feel in the Pouch of Douglas (POD) on internal examination.

Question 554: A 6-week pregnant primigravida presents with severe, acute abdominal pain. Ultrasound confirms an ectopic pregnancy. Which of the following has the least risk of ectopic pregnancy?

A. Tubectomy
B. Infertility for more than 1 year
C. Copper T (Intrauterine Device)
D. Condoms (Correct Answer)

Explanation: **Explanation:** The risk of ectopic pregnancy is assessed in two ways: the **absolute risk** (the chance of any pregnancy occurring) and the **relative risk** (the chance that, if a pregnancy occurs, it will be ectopic). **1. Why Condoms are the Correct Answer:** Condoms are a barrier method of contraception. They prevent pregnancy by preventing sperm from reaching the egg. Because they significantly reduce the overall (absolute) risk of conception without altering the anatomy or physiology of the fallopian tubes, they carry the **least risk** of ectopic pregnancy among the given options. **2. Analysis of Incorrect Options:** * **Tubectomy:** While it is a highly effective permanent sterilization method, if a pregnancy *does* occur (due to recanalization or fistula), there is a very high relative risk (approx. 30-50%) that it will be ectopic. * **Infertility (>1 year):** Infertility is often caused by Pelvic Inflammatory Disease (PID) or endometriosis, both of which cause tubal scarring and ciliary dysfunction. This significantly increases the risk of an ectopic gestation. * **Copper T (IUD):** IUDs are excellent at preventing intrauterine pregnancies. However, they do not prevent ovulation. If the IUD fails, the relative risk of the pregnancy being ectopic is higher than in the general population because the device prevents implantation in the uterus more effectively than in the tube. **Clinical Pearls for NEET-PG:** * **Highest Risk Factor:** Previous history of ectopic pregnancy (10-fold increase). * **Most Common Site:** Ampulla of the fallopian tube. * **Most Common Site for Rupture:** Isthmus (due to its narrow lumen). * **Gold Standard Diagnosis:** Transvaginal Ultrasound (TVS) + Serial β-hCG levels. * **Classic Triad:** Amenorrhea, abdominal pain, and vaginal bleeding (present in only 50% of cases).

Question 555: Increased perinatal mortality in diabetic pregnancy is due to which of the following?

A. Congenital malformations
B. Hypoglycemia
C. Hyaline membrane disease
D. All of the above (Correct Answer)

Explanation: **Explanation:** Perinatal mortality in diabetic pregnancies remains significantly higher than in the general population due to a spectrum of complications affecting the fetus and neonate. The correct answer is **All of the above** because each factor contributes to the increased risk at different stages. 1. **Congenital Malformations (Option A):** This is the leading cause of perinatal mortality in diabetic pregnancies. Poor glycemic control during the period of organogenesis (first 8 weeks) is teratogenic. The most common anomalies are cardiac (e.g., VSD, TGA), but the most specific is **Caudal Regression Syndrome**. 2. **Hypoglycemia (Option B):** Maternal hyperglycemia leads to fetal hyperglycemia, which causes **fetal hyperinsulinism**. After birth, the high insulin levels persist while the glucose supply from the placenta is cut off, leading to severe neonatal hypoglycemia. If not managed, this can lead to seizures and death. 3. **Hyaline Membrane Disease (Option C):** Hyperinsulinemia in the fetus acts as an antagonist to cortisol, delaying the production of surfactant by Type II pneumocytes. Consequently, infants of diabetic mothers (IDMs) are at a higher risk of Respiratory Distress Syndrome (RDS) even at term. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of death:** Congenital malformations (Pre-gestational diabetes). * **Most common malformation:** Cardiac anomalies (specifically VSD). * **Most specific malformation:** Caudal Regression Syndrome (Sacral agenesis). * **Macrosomia:** Defined as birth weight >4000g; caused by fetal hyperinsulinism (growth hormone-like effect). * **HbA1c Goal:** Ideally <6.0–6.5% preconception to minimize malformation risks.

Question 556: What is the recommended daily dose of folic acid for treating megaloblastic anemia during pregnancy?

A. 400 mg
B. 5 mg
C. 1 mg (Correct Answer)
D. 2 mg

Explanation: **Explanation:** **1. Why Option C (1 mg) is Correct:** Megaloblastic anemia in pregnancy is most commonly caused by **folic acid deficiency**. While the physiological requirement for folate increases during pregnancy, the therapeutic dose required to treat established megaloblastic anemia is **1 mg of folic acid daily**. This dose is sufficient to induce a reticulocyte response and restore hemoglobin levels, provided there is no concurrent Vitamin B12 deficiency or malabsorption. **2. Why Other Options are Incorrect:** * **Option A (400 mg):** This is an erroneously high value. The standard prophylactic dose for low-risk pregnancies is 400 **micrograms** (0.4 mg), not milligrams. * **Option B (5 mg):** This is the high-dose prophylaxis recommended for women at **high risk of Neural Tube Defects (NTDs)** (e.g., previous child with NTD, maternal diabetes, or anti-epileptic drug use). While often used in clinical practice for anemia, 1 mg is the standard textbook recommendation for treatment. * **Option D (2 mg):** This is not a standard recommended dose in international or national guidelines for the treatment of nutritional anemia. **3. High-Yield Clinical Pearls for NEET-PG:** * **Prophylaxis (Low Risk):** 400 mcg (0.4 mg) daily, starting 1 month preconception until 12 weeks of gestation. * **Prophylaxis (High Risk):** 5 mg daily to prevent NTD recurrence. * **Iron + Folic Acid (IFA) Program:** Under the *Anemia Mukt Bharat* guidelines, pregnant women receive **60 mg elemental iron + 500 mcg (0.5 mg) folic acid** daily for 180 days. * **Diagnosis:** Megaloblastic anemia is characterized by a **Mean Corpuscular Volume (MCV) > 100 fL** and hypersegmented neutrophils on peripheral smear. Always rule out Vitamin B12 deficiency before starting high-dose folate to avoid masking neurological symptoms.

Question 557: Fundal height is more than the period of gestation in all conditions except:

A. Intrauterine death (IUD) (Correct Answer)
B. Twin pregnancy
C. Hydatidiform mole
D. Hydramnios

Explanation: **Explanation:** In clinical obstetrics, the symphysis-fundal height (SFH) is a crucial screening tool. When the **fundal height is less than the period of gestation**, it indicates a decrease in the contents of the uterus (fetus, placenta, or liquor). **1. Why Intrauterine Death (IUD) is the Correct Answer:** In IUD, the cessation of fetal growth, the loss of fetal muscle tone (leading to collapse of the fetal body), and the subsequent absorption of amniotic fluid (liquor) cause the uterus to shrink. Consequently, the fundal height becomes **less than** the expected period of gestation. **2. Analysis of Incorrect Options (Conditions where SFH > Gestational Age):** * **Twin Pregnancy:** The presence of two fetuses and two placentas increases the total intrauterine volume. * **Hydatidiform Mole:** This is characterized by the rapid proliferation of chorionic villi and the accumulation of concealed hemorrhage, often making the uterus "doughy" and larger than dates. * **Hydramnios (Polyhydramnios):** An excessive accumulation of amniotic fluid directly increases the uterine size beyond what is expected for the fetal age. **Clinical Pearls for NEET-PG:** * **Other causes of SFH > Dates:** Large for gestational age (LGA) fetus, uterine fibroids, and maternal obesity or full bladder during examination. * **Other causes of SFH < Dates:** Intrauterine growth restriction (IUGR), Oligohydramnios, and transverse lie. * **Rule of Thumb:** A discrepancy of **>2 cm** between SFH and gestational age warrants further investigation via ultrasound. * **McDonald's Rule:** SFH in cm = Gestational age in weeks (applicable between 20–36 weeks).

Question 558: Eclampsia is a complication of which condition complicating pregnancy?

A. Anemia complicating pregnancy
B. Diabetes complicating pregnancy
C. Hypertension complicating pregnancy (Correct Answer)
D. Cardiac disease complicating pregnancy

Explanation: **Explanation:** **Eclampsia** is defined as the onset of generalized tonic-clonic seizures in a woman with pre-eclampsia that cannot be attributed to other causes (such as epilepsy or intracranial hemorrhage). Since pre-eclampsia is a multisystem disorder characterized by **hypertension** (BP ≥140/90 mmHg) and proteinuria (or end-organ dysfunction) after 20 weeks of gestation, eclampsia is fundamentally a severe complication of **hypertensive disorders of pregnancy**. * **Why Option C is correct:** The pathophysiology involves vasospasm, endothelial dysfunction, and cerebral edema resulting from severe hypertension. Eclampsia is the convulsive stage of pre-eclampsia. * **Why Options A, B, and D are incorrect:** While Anemia, Diabetes (Gestational or Prelestational), and Cardiac disease are significant medical complications of pregnancy, they do not directly cause the specific seizure-phenotype known as eclampsia. However, pre-existing diabetes and chronic hypertension are risk factors for developing pre-eclampsia. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC):** Magnesium Sulfate ($MgSO_4$) is the DOC for both the treatment of eclamptic seizures and prophylaxis in severe pre-eclampsia (Pritchard Regimen). * **Antidote for $MgSO_4$ toxicity:** Calcium Gluconate (10 ml of 10% solution IV). * **Definitive Treatment:** Delivery of the fetus and placenta is the only definitive cure for eclampsia/pre-eclampsia. * **Warning Signs:** Impending eclampsia is signaled by headache, visual disturbances (scotomata), and epigastric pain.

Question 559: What percentage of eclampsia cases occur antepartum?

A. Less than 10%
B. 15-20%
C. 35-45% (Correct Answer)
D. More than 50%

Explanation: **Explanation:** Eclampsia is defined as the onset of generalized tonic-clonic seizures in a woman with pre-eclampsia that cannot be attributed to other causes. The timing of these seizures is traditionally divided into three categories: antepartum (before labor), intrapartum (during labor), and postpartum (after delivery). **Why Option C is Correct:** According to standard obstetric textbooks (Williams Obstetrics and Dutta’s Textbook of Obstetrics), the distribution of eclamptic seizures is approximately: * **Antepartum:** 35–45% (The most common single period). * **Intrapartum:** 30–35%. * **Postpartum:** 20–25% (usually within the first 48 hours). Therefore, the range of 35-45% accurately reflects the highest frequency of cases occurring before the onset of labor. **Why Other Options are Incorrect:** * **Option A & B:** These percentages are too low. While postpartum eclampsia accounts for about 20-25%, antepartum cases are significantly more frequent. * **Option D:** While antepartum eclampsia is the most common, it rarely exceeds 50% in modern clinical data, as a significant portion of cases are triggered by the physiological stress of labor (intrapartum) or occur immediately after birth. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Magnesium Sulfate ($MgSO_4$) is the gold standard for both the control of seizures and prophylaxis in severe pre-eclampsia (Pritchard Regimen). * **Postpartum Timing:** "Early postpartum" eclampsia occurs within 48 hours; "Late postpartum" occurs after 48 hours but within 4 weeks. * **Definitive Treatment:** Delivery of the fetus and placenta is the only definitive cure for the underlying pathology. * **Warning Signs:** Headache, visual disturbances (scotomata), and epigastric pain are classic premonitory symptoms of an impending eclamptic fit.

Question 560: What is the highest risk factor for ectopic pregnancy?

A. Intrauterine device
B. Previous surgery for ectopic pregnancy (Correct Answer)
C. Salpingitis
D. Salpingitis isthmica nodosa

Explanation: **Explanation:** The risk factors for ectopic pregnancy are categorized into high, moderate, and low risk. Understanding the distinction between the **highest risk factor** and the **most common risk factor** is crucial for NEET-PG. **1. Why Option B is Correct:** A **previous history of ectopic pregnancy** is the strongest risk factor. Once a woman has had one ectopic pregnancy, the risk of recurrence increases significantly (approximately 10-fold). If she has had a previous tubal surgery specifically to treat an ectopic (like a salpingostomy), the damage to the endosalpinx and altered tubal motility create a high-risk environment for blastocyst implantation. The risk increases further with each subsequent ectopic event. **2. Analysis of Incorrect Options:** * **Option A (Intrauterine Device):** While an IUD is highly effective at preventing pregnancy, if a woman *does* become pregnant with an IUD in situ, there is a higher *proportionate* chance it will be ectopic. However, it is not the strongest overall risk factor. * **Option C (Salpingitis/PID):** Pelvic Inflammatory Disease (PID) is the **most common** risk factor for ectopic pregnancy due to post-inflammatory scarring and adhesion formation. However, the **relative risk** is lower than that of a previous ectopic pregnancy. * **Option D (Salpingitis Isthmica Nodosa):** This refers to nodular thickening of the fallopian tube (diverticula). While it is a strong risk factor, it is less common and carries a lower statistical risk compared to a prior ectopic history. **Clinical Pearls for NEET-PG:** * **Highest Risk Factor:** Previous ectopic pregnancy (RR >10). * **Most Common Risk Factor:** Pelvic Inflammatory Disease (PID) / Salpingitis. * **Most Common Site:** Ampulla of the Fallopian tube (70%). * **Most Common Site for Rupture:** Isthmus (occurs early, at 6-8 weeks). * **Classic Triad:** Amenorrhea, abdominal pain, and vaginal bleeding (present in only 50% of cases).

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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