Maternal-Fetal Medicine Practice Questions

Q: What is the single most effective drug in eclampsia?

Magnesium sulphate. **Explanation:** **Magnesium sulphate ($MgSO_4$)** is the drug of choice for both the prevention and control of seizures in eclampsia. Its superiority was definitively established by the **Collaborative Eclampsia Trial**, which proved it is more effective than phenytoin or diazepam in preventing recurrent convulsions and reducing maternal mortality. **Mechanism of Action:** $MgSO_4$ acts as a central nervous system depressant and a vasodilator. It works primarily by blocking **NMDA receptors** in the brain, increasing the seizure threshold. It also causes cerebral vasodilation, which reverses the vasospasm associated with eclampsia. **Why other options are incorrect:** * **Dilantin (Phenytoin):** While an effective anti-epileptic for primary seizure disorders, it is significantly less effective than $MgSO_4$ in eclampsia and carries a higher risk of recurrent seizures. * **Phenobarbital:** This is a sedative-hypnotic. It causes significant maternal respiratory depression and neonatal depression (floppy baby syndrome) without addressing the underlying pathophysiology of eclampsia. * **Paraldehyde:** Now largely obsolete, it was used historically but is difficult to administer and lacks the specific neuroprotective benefits of Magnesium. **High-Yield Clinical Pearls for NEET-PG:** * **Regimen:** The **Pritchard Regimen** (IM) and **Zuspan Regimen** (IV) are the standard protocols. * **Therapeutic Range:** 4–7 mEq/L. * **Monitoring:** Always check for **Patellar reflex** (first to disappear), **Respiratory rate** (>12/min), and **Urine output** (>30 ml/hr) before each dose. * **Antidote:** 10 ml of 10% **Calcium Gluconate** IV (administered slowly).

Q: Smoking causes all of the following conditions except:

Preeclampsia. **Explanation:** The correct answer is **Preeclampsia**. This is a classic "paradoxical" high-yield fact in Obstetrics. While smoking is a major risk factor for almost all adverse pregnancy outcomes, multiple epidemiological studies have consistently shown that smoking is associated with a **decreased risk** of developing preeclampsia. **Why Preeclampsia is the correct answer:** The underlying mechanism is believed to be related to **carbon monoxide (CO)** and **nicotine**. Smoking stimulates the production of placental growth factor (PlGF) and inhibits the release of soluble fms-like tyrosine kinase-1 (sFlt-1), an anti-angiogenic protein that is elevated in preeclampsia. By lowering sFlt-1 levels, smoking theoretically maintains better angiogenic balance, reducing the incidence of hypertension in pregnancy. **Why the other options are incorrect:** * **Preterm Birth:** Smoking is a potent cause of spontaneous preterm labor and preterm pre-labor rupture of membranes (PPROM) due to increased oxidative stress and collagen degradation in the fetal membranes. * **Abruptio Placenta:** Smoking causes chronic placental hypoxemia and vascular necrosis of the decidua, significantly increasing the risk of placental abruption. * **Intrauterine Fetal Demise (IUFD):** Smoking leads to chronic fetal hypoxia and Intrauterine Growth Restriction (IUGR) due to high levels of carboxyhemoglobin, which reduces oxygen delivery to the fetus, increasing the risk of stillbirth. **NEET-PG High-Yield Pearls:** * **Smoking & Preeclampsia:** Risk is reduced by approximately 30-50% in smokers. * **Smoking & Placenta:** It is a major risk factor for both **Placenta Previa** and **Abruptio Placenta**. * **Teratogenicity:** Smoking is specifically linked to **Orofacial clefts** (Cleft lip/palate). * **Post-natal:** It is the most significant modifiable risk factor for **Sudden Infant Death Syndrome (SIDS)**.

Q: In a pregnant patient with rheumatic heart disease, failure does not occur if she has which of the following conditions?

Hypothyroidism. **Explanation:** The core physiological challenge in managing a pregnant patient with Rheumatic Heart Disease (RHD) is the **increase in cardiac output (CO)**. Pregnancy normally increases CO by 30–50% to meet metabolic demands. Heart failure occurs when the cardiac reserve is overwhelmed by additional hemodynamic stressors. **Why Hypothyroidism is the Correct Answer:** Hypothyroidism is characterized by a **decreased metabolic rate**, which leads to bradycardia and a reduction in stroke volume. This effectively **lowers the cardiac output** and reduces the workload on the heart. In a patient with RHD (especially Mitral Stenosis), a slower heart rate allows for better diastolic filling, thereby acting as a "protective" factor against the development of congestive heart failure. **Analysis of Incorrect Options:** * **Preeclamptic Toxemia (PET):** Causes hypertension, increased systemic vascular resistance (afterload), and fluid retention, all of which precipitate heart failure. * **Hyperthyroidism:** Increases the metabolic rate, causes tachycardia, and significantly raises cardiac output, often leading to "high-output" heart failure. * **Polyhydramnios:** The excessive amniotic fluid increases intra-abdominal pressure, restricts venous return, and can cause sudden shifts in blood volume, stressing the maternal heart. **NEET-PG High-Yield Pearls:** * **Most common RHD lesion in pregnancy:** Mitral Stenosis (MS). * **Most common cause of maternal death in RHD:** Congestive Heart Failure. * **Critical periods for failure:** 28–32 weeks (peak plasma volume), during labor (second stage), and immediately postpartum (autotransfusion from the uterus). * **Management:** Beta-blockers are preferred in MS to maintain a slow heart rate and prolong diastole.

Q: At what period does tuberculosis flare up most commonly in a pregnant patient?

Puerperium. **Explanation:** The correct answer is **D. Puerperium**. **Medical Concept:** The primary reason for the flare-up of Tuberculosis (TB) during the puerperium (the 6-week period following childbirth) is the **reversal of pregnancy-induced immunosuppression**. During pregnancy, the maternal immune system shifts toward a Th2-dominant state (humoral immunity) to prevent fetal rejection, which suppresses the Th1-mediated response (cell-mediated immunity) required to control *Mycobacterium tuberculosis*. Upon delivery, there is a rapid "immune rebound" or restoration of Th1 responses. This sudden shift can lead to an inflammatory response against latent or subclinical infections, similar to **Immune Reconstitution Inflammatory Syndrome (IRIS)** seen in HIV patients starting ART. Additionally, the physical stress of labor and the metabolic demands of lactation further predispose the mother to reactivation. **Analysis of Incorrect Options:** * **A, B, & C (Trimesters):** While TB can occur at any stage, the high levels of progesterone and corticosteroids during pregnancy actually exert a protective, anti-inflammatory effect that often keeps the infection dormant. Therefore, clinical worsening is less common during the antepartum period compared to the postpartum period. **NEET-PG Clinical Pearls:** * **Congenital TB:** Most commonly acquired via the **umbilical vein** (primary complex in the liver) or by aspiration of infected amniotic fluid. * **Treatment:** The WHO/RNTCP regimen for TB in pregnancy is the same as in non-pregnant adults (2HREZ + 4HRE). **Streptomycin** is the only first-line drug **contraindicated** due to its ototoxicity (8th cranial nerve damage) to the fetus. * **Breastfeeding:** It is **not contraindicated** if the mother is on Anti-Tubercular Therapy (ATT), provided the infant receives Isoniazid prophylaxis and the mother practices respiratory hygiene.

Q: Which is the most significant finding in cardiotocography for the detection of fetal hypoxia?

Late deceleration. **Explanation:** **1. Why Late Deceleration is the Correct Answer:** Late decelerations are the most significant and ominous CTG finding for detecting **fetal hypoxia**. They are characterized by a gradual decrease in fetal heart rate (FHR) that begins *after* the peak of the uterine contraction and returns to baseline only after the contraction has ended. This delay occurs because the contraction transiently reduces uterine blood flow; in a fetus with borderline oxygenation, this reduction pushes the fetal $PO_2$ below the critical threshold, triggering chemoreceptor-mediated vagal responses and direct myocardial depression. Persistent late decelerations indicate **uteroplacental insufficiency**. **2. Why Other Options are Incorrect:** * **Variable Deceleration:** These are the most common type of decelerations and are caused by **umbilical cord compression**. While frequent or "atypical" variables can lead to hypoxia, they are not as specific for primary uteroplacental failure as late decelerations. * **Sinusoidal Pattern:** A smooth, sine-wave-like pattern is highly specific for **severe fetal anemia** (e.g., Rh isoimmunization or vasa previa hemorrhage) rather than acute hypoxic-ischemic distress. * **Early Deceleration:** These are "mirror images" of contractions caused by **fetal head compression**. They are considered physiological (benign) and do not indicate hypoxia. **Clinical Pearls for NEET-PG:** * **Reassuring CTG:** Requires a normal baseline (110–160 bpm), moderate variability (6–25 bpm), and presence of accelerations. * **Most Sensitive Indicator:** Loss of **fetal heart rate variability** is often the earliest sign of fetal compromise, but late decelerations are the most specific for hypoxia. * **Management:** Persistent late decelerations require immediate intrauterine resuscitation (left lateral position, oxygen, IV fluids, stopping oxytocin) and prompt delivery if the pattern persists.

Q: A woman presents with amenorrhea of 6 weeks duration and a lump in the right iliac fossa. What is the investigation of choice?

Ultrasound abdomen. **Explanation:** The clinical presentation of **amenorrhea (6 weeks)** followed by a **lump in the iliac fossa** is highly suggestive of an **Ectopic Pregnancy** or a corpus luteum cyst. In any woman of reproductive age presenting with these symptoms, the primary goal is to confirm pregnancy location and viability. **1. Why Ultrasound (USG) is the Investigation of Choice:** Ultrasound (specifically Transvaginal Sonography or TVS) is the **gold standard first-line investigation** for suspected ectopic pregnancy. It is non-invasive, cost-effective, and lacks ionizing radiation. It can identify an intrauterine gestational sac, an adnexal mass (the "blob sign" or "tubal ring sign"), or free fluid in the Pouch of Douglas (suggesting rupture). **2. Why other options are incorrect:** * **Laparoscopy:** While it is the *diagnostic gold standard* (most accurate), it is an invasive surgical procedure. It is reserved for cases where USG is inconclusive or for definitive management. * **CT Scan:** It is contraindicated in early pregnancy due to high doses of ionizing radiation, which poses a risk of teratogenicity and fetal loss. * **Shielded X-ray:** X-rays have no role in diagnosing early pregnancy or soft tissue adnexal masses. Even with shielding, the diagnostic yield is zero for this condition. **Clinical Pearls for NEET-PG:** * **Discriminatory Zone:** The level of serum β-hCG at which an intrauterine gestational sac should be visible on USG (usually **1500–2000 mIU/ml** for TVS). If β-hCG is above this and the uterus is empty, suspect ectopic pregnancy. * **Arias-Stella Reaction:** Hypersecretory endometrium seen on histology in cases of ectopic pregnancy (due to hormonal stimulation without an intrauterine implant). * **Most common site of Ectopic:** Ampulla of the Fallopian tube.

Question 1

What is the single most effective drug in eclampsia?

Accepted Answer

Magnesium sulphate

Answer

Dilantin

Answer

Phenobarbital

Answer

Paraldehyde

Question 2

What is the recommended management for intrauterine fetal death at 36 weeks gestation?

Accepted Answer

Await spontaneous expulsion

Answer

Continue pregnancy until term

Answer

Administer Syntocinon and artificial rupture of membranes (ARM)

Answer

Perform hysterectomy

Question 3

One of the parents has a balanced translocation between chromosome 15 and 21. What advice will you provide to the couple to prevent a child being born with Down syndrome?

Accepted Answer

Prenatal diagnosis and abortion

Answer

Artificial insemination with donor's sperm

Answer

Adoption

Answer

No need to worry as there is no increased risk

Question 4

Smoking causes all of the following conditions except:

Accepted Answer

Preeclampsia

Answer

Preterm birth

Answer

Abruptio placenta

Answer

Intrauterine fetal demise

Question 5

In a pregnant patient with rheumatic heart disease, failure does not occur if she has which of the following conditions?

Accepted Answer

Hypothyroidism

Answer

Preeclamptic toxemia

Answer

Hyperthyroidism

Answer

Polyhydramnios

Question 6

At what period does tuberculosis flare up most commonly in a pregnant patient?

Accepted Answer

Puerperium

Answer

First trimester

Answer

Second trimester

Answer

Third trimester

Question 7

The concentration of lecithin relative to sphingomyelin begins to rise in which week of gestation?

Accepted Answer

32 weeks

Answer

20 weeks

Answer

36 weeks

Answer

28 weeks

Question 8

The

Accepted Answer

Spina bifida

Answer

Anencephaly

Answer

Agenesis of corpus callosum

Answer

Cystic hygroma

Question 9

Which is the most significant finding in cardiotocography for the detection of fetal hypoxia?

Accepted Answer

Late deceleration

Answer

Variable deceleration

Answer

Sinusoidal deceleration

Answer

Early deceleration

Question 10

A woman presents with amenorrhea of 6 weeks duration and a lump in the right iliac fossa. What is the investigation of choice?

Accepted Answer

Ultrasound abdomen

Answer

Laparoscopy

Answer

CT scan

Answer

Shielded X-ray

Maternal-Fetal Medicine — MCQs

Maternal-Fetal Medicine — MCQs

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