Maternal-Fetal Medicine Practice Questions

Q: What ultrasound findings suggest cervical incompetence?

All of the above. **Cervical Incompetence** (also known as Cervical Insufficiency) is the inability of the uterine cervix to retain a pregnancy in the second trimester in the absence of clinical contractions. It is a structural weakness that leads to painless cervical dilatation and subsequent preterm birth or mid-trimester miscarriage. ### **Explanation of Ultrasound Findings** Transvaginal Ultrasound (TVS) is the gold standard for diagnosing cervical changes. The correct answer is **D** because all three findings are progressive markers of cervical failure: 1. **Shortened Cervical Length:** A cervical length of **<25 mm** before 24 weeks of gestation is the most significant predictor of preterm birth. 2. **Funneling of the Internal Os:** This occurs when the internal os opens but the external os remains closed. It is often described by the shapes **T, Y, V, and U** (mnemonic: **"Trust Your Vaginal Ultrasound"**), where 'U' represents the most advanced stage of funneling. 3. **Widening of the Internal Os:** As the cervix weakens, the internal os dilates, often allowing the fetal membranes to prolapse into the cervical canal (the "hourglass" membranes sign). ### **Why other options are incorrect** Options A, B, and C are individual components of the same pathological process. Selecting only one would be incomplete, as they often occur concurrently or sequentially during the "shortening and funneling" process. ### **NEET-PG High-Yield Pearls** * **Gold Standard Diagnosis:** History-based (recurrent mid-trimester losses) or TVS-based (cervical length <25 mm). * **McDonald’s and Shirodkar’s Operations:** These are the two common types of cervical cerclage. * **Best Time for Cerclage:** Usually performed between **12–14 weeks** of gestation. * **The "Stress Test":** Applying fundal pressure during ultrasound can elicit funneling that is not visible at rest, helping in early diagnosis.

Q: 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) depends on the presence of pulmonary surfactants in the amniotic fluid. **Why Phosphatidylglycerol (PG) is the best method:** Phosphatidylglycerol is a minor constituent of surfactant that appears late in gestation (usually after 35–36 weeks). Its presence is the **most reliable and specific indicator** of lung maturity. Unlike the L/S ratio, PG estimation is **not affected by contamination** with blood, meconium, or vaginal secretions, making it the "gold standard" for accuracy in complicated pregnancies. **Analysis of Incorrect Options:** * **Lecithin/Sphingomyelin (L/S) ratio:** Historically the most common test. A ratio >2:1 indicates maturity. However, it is highly sensitive to contamination (blood/meconium) and has a higher false-positive rate in diabetic pregnancies compared to PG. * **Bilirubin in amniotic fluid:** Measured via spectrophotometry ($\Delta OD_{450}$), this is used to assess the severity of **Rh-isoimmunization** and fetal hemolysis, not lung maturity. * **Amniotic fluid creatinine:** This reflects **fetal renal maturity** and muscle mass. While levels >2 mg/dL correlate with a gestational age of >37 weeks, it is not a direct or reliable measure of pulmonary surfactant. **High-Yield Clinical Pearls for NEET-PG:** * **Most sensitive/earliest test:** L/S ratio. * **Most specific test (Best):** Phosphatidylglycerol (PG). * **Rapid bedside test:** Shake test (Bubble stability test). * **Diabetes Mellitus:** PG is particularly useful here because the L/S ratio can be >2:1 while the lungs are still immature (delayed maturation). * **Lamellar Body Count (LBC):** A modern, rapid automated test; a count >30,000-50,000/µL indicates maturity.

Q: Which of the following genital infections carries the highest risk for preterm delivery?

Bacterial vaginitis. **Explanation:** **Bacterial Vaginosis (BV)** is the most significant genital infection associated with adverse pregnancy outcomes, particularly **preterm labor (PTL)** and **preterm premature rupture of membranes (PPROM)**. The underlying mechanism involves a shift in vaginal flora from protective *Lactobacilli* to anaerobic organisms (e.g., *Gardnerella vaginalis*, *Mobiluncus*). These bacteria produce inflammatory cytokines, prostaglandins, and phospholipase A2, which stimulate uterine contractions and weaken fetal membranes, leading to cervical ripening and preterm delivery. **Analysis of Options:** * **Bacterial Vaginosis (Correct):** It increases the risk of preterm birth by approximately 2-fold. It is also linked to late miscarriages and postpartum endometritis. * **Trichomonas vaginitis:** While associated with some adverse outcomes, the correlation with preterm delivery is significantly weaker than BV. Interestingly, treating asymptomatic Trichomoniasis in pregnancy has not been proven to reduce preterm birth rates. * **Monilial (Candidiasis) vaginitis:** This is very common in pregnancy due to high estrogen levels but is considered a commensal overgrowth. It does **not** increase the risk of preterm labor. * **Human Papilloma Virus (HPV):** This is a viral infection primarily associated with cervical dysplasia and genital warts. It does not have a recognized causal link with preterm delivery. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis for BV:** Nugent Scoring (Gram stain). * **Clinical Diagnosis:** Amsel’s Criteria (requires 3 out of 4: Thin white discharge, pH >4.5, +ve Whiff test, and **Clue cells**). * **Treatment in Pregnancy:** Oral Clindamycin or Metronidazole is recommended to symptomatic patients to alleviate symptoms, though it may not always prevent preterm birth once the inflammatory cascade has begun.

Q: Caudal regression syndrome, a rare anomaly, is associated with which maternal complication during pregnancy?

Diabetes. **Explanation:** **Caudal Regression Syndrome (CRS)** is a rare congenital malformation characterized by varying degrees of developmental failure involving the lower spine (sacrum/lumbar vertebrae), spinal cord, and lower limbs. **1. Why Diabetes is the Correct Answer:** Maternal **Pre-gestational Diabetes Mellitus** (Type 1 or Type 2) is the most significant risk factor for CRS. While the most common cardiac anomaly in infants of diabetic mothers (IDM) is a Ventricular Septal Defect (VSD), **Caudal Regression Syndrome is the most specific malformation associated with maternal diabetes.** The risk is increased nearly 200-fold in diabetic pregnancies compared to the general population. The pathogenesis is linked to fetal oxidative stress and disturbed gene expression (like *Hox* genes) during the first trimester due to poor glycemic control. **2. Why Other Options are Incorrect:** * **Epilepsy:** While anti-epileptic drugs (like Valproate) are teratogenic, they are typically associated with Neural Tube Defects (NTDs) like spina bifida, not CRS. * **Hypertension:** Chronic hypertension is associated with fetal growth restriction (IUGR) and placental abruption, but it is not a primary teratogen for structural spinal anomalies. * **SLE:** Maternal SLE is classically associated with **Congenital Complete Heart Block** in the fetus due to the transplacental passage of anti-Ro (SSA) and anti-La (SSB) antibodies. **High-Yield Facts for NEET-PG:** * **Most common anomaly in IDM:** Congenital Heart Disease (specifically VSD). * **Most specific anomaly in IDM:** Caudal Regression Syndrome (Sacral Agenesis). * **Hypertrophic Cardiomyopathy:** Often seen in IDM; involves the interventricular septum and is usually transient. * **Neonatal Complications of IDM:** Hypoglycemia, Hypocalcemia, Hyperbilirubinemia, and Polycythemia.

Q: What is the most effective drug for the treatment of Intrauterine Growth Restriction (IUGR)?

None of the above. **Explanation:** The correct answer is **None of the above** because, currently, there is **no proven pharmacological treatment** to reverse or "cure" established Intrauterine Growth Restriction (IUGR). The management of IUGR focuses primarily on intensive fetal surveillance (Doppler studies, BPP) and timely delivery to prevent intrauterine fetal demise. **Why the other options are incorrect:** * **Aspirin:** Low-dose aspirin (75–150 mg) is highly effective for the **prevention** of placental insufficiency and preeclampsia if started before 16 weeks of gestation in high-risk patients. However, it has no therapeutic benefit once IUGR has already been diagnosed. * **Nitric Oxide (NO) Donors:** While NO is a potent vasodilator, clinical trials (like the use of Sildenafil or Glyceryl Trinitrate) have failed to show significant improvement in fetal growth outcomes or a reduction in perinatal mortality. * **Antioxidants:** Vitamins C and E were once hypothesized to reduce oxidative stress in the placenta, but large-scale studies have shown they do not improve birth weight and may even increase the risk of premature rupture of membranes. **NEET-PG High-Yield Pearls:** 1. **Prevention vs. Treatment:** Aspirin is for *prophylaxis*, not *treatment*. 2. **Definitive Management:** The only "cure" for IUGR is delivery, balanced against the risks of prematurity. 3. **Monitoring Gold Standard:** **Umbilical Artery Doppler** is the most important tool for monitoring IUGR; "Absent or Reversed End Diastolic Flow" (AREDF) is a critical indicator for urgent delivery. 4. **Steroids:** If delivery is planned before 34 weeks, corticosteroids (Betamethasone) must be given to accelerate fetal lung maturity.

Q: A 34-week pregnant patient presents with acute liver failure, coagulopathy, and intrauterine fetal demise. Her blood pressure is normal and viral markers are negative. What is the most probable diagnosis?

Acute fatty liver of pregnancy. **Explanation:** **Acute Fatty Liver of Pregnancy (AFLP)** is a rare but life-threatening emergency occurring in the third trimester. The hallmark of AFLP is **microvesicular steatosis** of hepatocytes, leading to rapid-onset hepatic failure. The clinical presentation in this case—acute liver failure (jaundice, encephalopathy), coagulopathy (DIC), and intrauterine fetal demise (IUFD) in the absence of hypertension—is classic for AFLP. While often associated with preeclampsia, 50% of patients may be normotensive. **Why other options are incorrect:** * **Intrahepatic Cholestasis of Pregnancy (ICP):** Presents with intense pruritus (palms and soles) and elevated bile acids. It does not cause liver failure or coagulopathy. * **Viral Hepatitis:** While the most common cause of jaundice in pregnancy, it is ruled out here by negative viral markers. * **Obstructive Jaundice:** Usually presents with colicky pain and an obstructive enzyme pattern (high ALP/GGT) without acute liver failure or DIC. **High-Yield Clinical Pearls for NEET-PG:** * **Swansea Criteria:** Used for diagnosing AFLP (requires $\geq$ 6 clinical/biochemical features). * **Biochemical Hallmarks:** Hypoglycemia (very characteristic), hyperuricemia, elevated ammonia, and prolonged PT/APTT. * **Genetic Link:** Strongly associated with a fetal deficiency of the enzyme **Long-Chain 3-Hydroxyacyl-CoA Dehydrogenase (LCHAD)**. * **Management:** Immediate stabilization and **urgent delivery**, regardless of gestational age. Liver function typically improves rapidly postpartum.

Q: Single umbilical artery is associated with all of the following except?

Advanced maternal age. **Explanation:** A **Single Umbilical Artery (SUA)**, or 2-vessel cord, occurs when one of the two umbilical arteries is absent (usually the left). It is the most common umbilical cord anomaly, occurring in approximately 1% of singleton pregnancies. **Why "Advanced Maternal Age" is the correct answer:** Unlike many chromosomal anomalies, the incidence of SUA is **not** significantly associated with advanced maternal age. Instead, it is more frequently associated with **young maternal age** (less than 20 years), maternal smoking, and primiparity. **Analysis of Incorrect Options:** * **Polyhydramnios:** SUA is frequently associated with maternal complications like polyhydramnios and pre-eclampsia. Polyhydramnios often occurs due to associated fetal structural anomalies (e.g., esophageal atresia) that interfere with fetal swallowing. * **Fetal Growth Retardation (FGR):** There is a strong correlation between SUA and FGR. Even in the absence of structural malformations, a single artery may lead to placental insufficiency, resulting in a higher incidence of small-for-gestational-age (SGA) infants. * **Increased incidence of fetal malformation:** Approximately 20–30% of fetuses with SUA have associated malformations. The most common involve the **cardiovascular system** (e.g., VSD) and the **genitourinary system** (e.g., renal agenesis). **High-Yield Clinical Pearls for NEET-PG:** * **Most common association:** Renal and Cardiac anomalies. * **Chromosomal link:** SUA is associated with Trisomy 18 (Edwards Syndrome) and Trisomy 13 (Patau Syndrome). * **Management:** If SUA is detected on a mid-trimester scan, a detailed **Targeted Imaging for Fetal Anomalies (TIFFA)** and a **Fetal Echocardiogram** are mandatory. * **Prognosis:** If the SUA is "isolated" (no other anomalies), the neonatal outcome is generally excellent, though serial growth scans are recommended.

Q: Which of the following is NOT a feature of pre-eclampsia?

Vomiting. **Explanation:** Pre-eclampsia is a multisystem disorder characterized by new-onset hypertension (BP ≥ 140/90 mmHg) and proteinuria (or end-organ dysfunction) after 20 weeks of gestation. **Why "Vomiting" is the correct answer:** While nausea and vomiting can occur in severe cases (often associated with HELLP syndrome), **vomiting is not a diagnostic feature or a specific "warning sign"** of pre-eclampsia. It is a non-specific symptom common in pregnancy. In contrast, the other options represent classic diagnostic criteria or "imminent signs" indicating severe pre-eclampsia. **Analysis of Incorrect Options:** * **Option A (BP > 140/90 mmHg):** This is the fundamental diagnostic threshold for gestational hypertension and pre-eclampsia when recorded on two occasions at least 4 hours apart after 20 weeks. * **Option B (Epigastric pain):** This is a "warning sign" of imminent eclampsia. It typically results from hepatic stretching (Glisson’s capsule tension) or subcapsular hematoma, often seen in HELLP syndrome. * **Option D (Visual disturbances and heartburn):** Visual disturbances (scotomata, blurring) indicate cortical irritability or retinal edema. Heartburn/retrosternal pain is often grouped with epigastric pain as a sign of hepatic involvement or severe gastric irritation in pre-eclampsia. **NEET-PG High-Yield Pearls:** 1. **New Definition:** Proteinuria is no longer mandatory for diagnosis if other end-organ dysfunctions (thrombocytopenia, renal insufficiency, impaired liver function, or cerebral symptoms) are present. 2. **Imminent Eclampsia Signs:** Headache (most common), visual disturbances, epigastric pain, and hyperreflexia. 3. **Drug of Choice:** Magnesium Sulfate ($MgSO_4$) is the drug of choice for both prophylaxis and control of convulsions in eclampsia (Pritchard Regimen). 4. **Definitive Treatment:** Delivery of the fetus and placenta.

Q: Polyhydramnios is typically most pronounced during which gestational period?

Third trimester. **Explanation:** Polyhydramnios is defined as an excessive accumulation of amniotic fluid (Amniotic Fluid Index >24 cm or Single Deepest Pocket >8 cm). The correct answer is the **Third Trimester** because amniotic fluid dynamics are volume-dependent on fetal physiological processes that peak late in pregnancy. **Why the Third Trimester is Correct:** Amniotic fluid volume increases progressively throughout pregnancy, reaching its peak (approximately 800–1000 mL) at **34–36 weeks**. From the second trimester onwards, fetal **urine production** becomes the primary source of amniotic fluid, while fetal **swallowing** is the main pathway for resorption. In cases of polyhydramnios (e.g., maternal diabetes, fetal GI atresia, or idiopathic causes), the imbalance between production and resorption becomes most clinically evident and voluminous during the third trimester as fetal urine output reaches its maximum (up to 700–1000 mL/day). **Why Other Options are Incorrect:** * **A & B (First/Early Second Trimester):** During early pregnancy, amniotic fluid is primarily an ultrafiltrate of maternal plasma or fetal serum across non-keratinized skin. The volumes are too small (approx. 30 mL at 10 weeks) for polyhydramnios to be "pronounced." * **C (Latter Second Trimester):** While fluid begins to increase rapidly here, it has not yet reached the physiological peak seen in the third trimester. **NEET-PG High-Yield Pearls:** * **Most common cause:** Idiopathic (approx. 50–60%), followed by Maternal Diabetes. * **Most common fetal anomaly:** Esophageal atresia (due to impaired swallowing). * **Clinical Sign:** "Fluid thrill" on abdominal examination and "Uterus larger than dates." * **Complications:** Preterm labor, Cord prolapse, and Postpartum hemorrhage (due to uterine atony).

Question 1

Paradoxical incontinence of urine in a primigravida is seen with which of the following conditions?

Accepted Answer

Retroflexion of the uterus

Answer

Anteflexion of the uterus

Answer

Sacculation

Answer

Uterine prolapse

Question 2

What ultrasound findings suggest cervical incompetence?

Accepted Answer

All of the above

Answer

Shortened cervical length

Answer

Funneling of the internal os

Answer

Widening of the internal os

Question 3

What is the best method for the diagnosis of lung maturity?

Accepted Answer

Phosphatidyl glycerol estimation in amniotic fluid

Answer

Lecithin/Sphingomyelin (L/S) ratio in amniotic fluid

Answer

Bilirubin in amniotic fluid

Answer

Amniotic fluid creatinine

Question 4

Which of the following genital infections carries the highest risk for preterm delivery?

Accepted Answer

Bacterial vaginitis

Answer

Trichomonas vaginitis

Answer

Monilial vaginitis

Answer

Human papilloma virus

Question 5

Caudal regression syndrome, a rare anomaly, is associated with which maternal complication during pregnancy?

Accepted Answer

Diabetes

Answer

Epilepsy

Answer

Hypertension

Answer

Systemic Lupus Erythematosus (SLE)

Question 6

What is the most effective drug for the treatment of Intrauterine Growth Restriction (IUGR)?

Accepted Answer

None of the above

Answer

Aspirin

Answer

Nitric oxide donors

Answer

Antioxidants

Question 7

A 34-week pregnant patient presents with acute liver failure, coagulopathy, and intrauterine fetal demise. Her blood pressure is normal and viral markers are negative. What is the most probable diagnosis?

Accepted Answer

Acute fatty liver of pregnancy

Answer

Intrahepatic cholestasis of pregnancy

Answer

Viral hepatitis

Answer

Obstructive jaundice

Question 8

Single umbilical artery is associated with all of the following except?

Accepted Answer

Advanced maternal age

Answer

Polyhydramnios

Answer

Fetal growth retardation

Answer

Increased incidence of fetal malformation

Question 9

Which of the following is NOT a feature of pre-eclampsia?

Accepted Answer

Vomiting

Answer

Blood pressure > 140/90 mmHg after 20 weeks of gestation

Answer

Epigastric pain

Answer

Visual disturbances and heartburn

Question 10

Polyhydramnios is typically most pronounced during which gestational period?

Accepted Answer

Third trimester

Answer

End of the first trimester

Answer

Early part of the second trimester

Answer

Latter part of the second trimester

Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine — MCQs

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