Neonatology Practice Questions

Q: A large for date baby may be due to which of the following conditions?

All of the above. **Explanation:** A **Large for Gestational Age (LGA)** or "Large for Date" baby is defined as a neonate whose birth weight is above the **90th percentile** for that specific gestational age. This condition is primarily driven by hyperinsulinism or genetic factors that accelerate fetal growth. * **Diabetic Mother (Option B):** This is the most common clinical cause. According to the **Pedersen Hypothesis**, maternal hyperglycemia leads to fetal hyperglycemia. This stimulates the fetal pancreas to secrete excess insulin. Since fetal insulin acts as a potent **anabolic growth hormone**, it leads to macrosomia (increased fat deposition and organomegaly). * **Beckwith-Wiedemann Syndrome (Option A):** This is a classic overgrowth disorder characterized by the triad of **macrosomia, macroglossia (large tongue), and omphalocele**. It involves dysregulation of imprinted genes on chromosome 11p15.5 (like IGF-2). * **Genetic Predisposition (Option C):** Constitutional factors, such as tall/obese parents or high maternal weight gain during pregnancy, significantly contribute to increased birth weight. **Why "All of the above" is correct:** All three conditions independently contribute to increased fetal size through either metabolic (insulin) or genetic pathways. **High-Yield Clinical Pearls for NEET-PG:** * **Infant of Diabetic Mother (IDM):** These babies are "large but immature." They are at high risk for **hypoglycemia, hypocalcemia, polycythemia, and Hypertrophic Cardiomyopathy (Septal hypertrophy).** * **Beckwith-Wiedemann Syndrome:** Associated with an increased risk of embryonal tumors, most commonly **Wilms tumor** and hepatoblastoma. * **Sotos Syndrome:** Another high-yield overgrowth syndrome characterized by a "macrodolichocephalic" head and advanced bone age.

Q: Deficiency of surfactant is seen in which of the following conditions?

Hyaline membrane disease (HMD). ### Explanation **Correct Option: C. Hyaline membrane disease (HMD)** Hyaline Membrane Disease, also known as **Respiratory Distress Syndrome (RDS)**, is primarily caused by a deficiency of pulmonary surfactant. Surfactant (produced by Type II pneumocytes) reduces alveolar surface tension. In its absence, alveoli collapse at the end of expiration (atelectasis), leading to impaired gas exchange, hypoxia, and the formation of proteinaceous "hyaline membranes" within the alveoli. This condition is most common in preterm infants (born before 34 weeks) because surfactant production only peaks near term. **Analysis of Incorrect Options:** * **A. Bronchopulmonary Dysplasia (BPD):** This is a chronic lung disease that occurs as a *complication* of prolonged mechanical ventilation and oxygen therapy, often following HMD. It is characterized by alveolar hypoplasia rather than primary surfactant deficiency. * **B. Neonatal Asphyxia:** This refers to impaired gas exchange leading to progressive hypoxia and hypercapnia. While asphyxia can *inactivate* existing surfactant, the primary pathology is a lack of oxygenation/perfusion, not a deficiency in surfactant production. * **D. Anencephaly:** While infants with anencephaly may have lung hypoplasia due to lack of fetal breathing movements or hormonal triggers (like ACTH/cortisol), surfactant deficiency is not the hallmark or defining feature of this neural tube defect. **High-Yield Clinical Pearls for NEET-PG:** * **Lecithin/Sphingomyelin (L/S) Ratio:** A ratio **>2:1** in amniotic fluid indicates fetal lung maturity. * **Best Initial Test:** Chest X-ray showing a **"Ground glass appearance"** and air bronchograms. * **Management:** Antenatal steroids (Dexamethasone/Betamethasone) given to the mother significantly reduce the risk of HMD. * **Surfactant Composition:** Primarily **Dipalmitoylphosphatidylcholine (DPPC)**; the most important protein for function is **SP-B**.

Q: In which of the following conditions are steroids NOT indicated for treatment?

Intraventricular hemorrhage. **Explanation:** The correct answer is **Intraventricular Hemorrhage (IVH)**. In neonatology, steroids are not used to treat IVH; in fact, postnatal corticosteroid use (especially dexamethasone) has been associated with an increased risk of neurodevelopmental impairment and does not reduce the incidence or severity of existing germinal matrix hemorrhage. **Why the other options are incorrect:** * **Hypercalcemia:** Glucocorticoids are a recognized treatment for refractory neonatal hypercalcemia (e.g., in Williams Syndrome or Subcutaneous Fat Necrosis). They work by decreasing intestinal calcium absorption and increasing renal calcium excretion. * **Respiratory Distress:** Steroids are indicated in two specific contexts: **Antenatal** (to prevent Respiratory Distress Syndrome by accelerating surfactant production) and **Postnatal** (to treat or prevent Bronchopulmonary Dysplasia/Chronic Lung Disease in ventilator-dependent infants). * **Enterocolitis:** While not a primary treatment for Necrotizing Enterocolitis (NEC), steroids are used in the management of **Eosinophilic Enterocolitis**, a rare allergic gastrointestinal disorder in infants that presents with vomiting and bloody stools. **High-Yield Clinical Pearls for NEET-PG:** * **Antenatal Steroids:** The "Gold Standard" for preventing RDS, IVH, and NEC when given to the mother 24–48 hours before preterm delivery (Betamethasone is preferred over Dexamethasone). * **Postnatal Steroids:** Used cautiously for BPD (DART protocol). Side effects include hyperglycemia, hypertension, and intestinal perforation (especially when used with Indomethacin). * **IVH Prevention:** The most effective prevention for IVH is the administration of **Antenatal Corticosteroids** to the mother, not postnatal administration to the neonate.

Q: Gastroschisis is associated with:

Younger maternal age. **Explanation:** **Gastroschisis** is a full-thickness paraumbilical abdominal wall defect (usually to the right of the umbilical cord) through which bowel herniates without a covering sac. **Why Younger Maternal Age is Correct:** Epidemiological studies consistently identify **young maternal age (especially <20 years)** as the strongest and most significant risk factor for gastroschisis. The underlying pathophysiology is thought to involve a vascular disruption of the right omphalomesenteric artery or umbilical vein. Younger mothers are statistically more likely to have exposure to risk factors like smoking, recreational drug use (cocaine/amphetamines), and poor nutrition, which contribute to this vascular compromise. **Why Other Options are Incorrect:** * **Maternal Obesity:** Unlike Omphalocele, which is associated with metabolic syndrome and obesity, Gastroschisis is more commonly associated with a **low maternal Body Mass Index (BMI)**. * **Elderly Primigravida:** Advanced maternal age is a risk factor for chromosomal abnormalities (like Trisomy 13, 18, 21) and **Omphalocele**, but it is protective against Gastroschisis. * **Anemia:** While poor nutrition is a risk factor, maternal anemia is not a specific or primary epidemiological association for gastroschisis compared to maternal age. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Usually to the **right** of the umbilical cord. * **Covering:** No sac (bowel is exposed to amniotic fluid, leading to "peel" or inflammation). * **Associations:** Unlike Omphalocele, Gastroschisis is **rarely associated with chromosomal anomalies** or syndromes (e.g., Beckwith-Wiedemann). * **Complication:** Intestinal atresia is the most common associated gastrointestinal anomaly. * **Management:** Immediate stabilization, covering the bowel with sterile saline-soaked gauze/silastic silo, and surgical closure.

Q: Delayed removal or absorption of amniotic fluid from the pulmonary system results in which condition?

Transient tachypnea of the newborn. **Explanation:** **Transient Tachypnea of the Newborn (TTN)**, also known as "Wet Lung Disease," is caused by a delay in the clearance of fetal lung fluid. In utero, the lungs are filled with amniotic fluid. During and after labor, this fluid is normally cleared via two mechanisms: mechanical "squeezing" during vaginal delivery and active resorption through epithelial sodium channels (ENaC) into the pulmonary lymphatics and capillaries. When this process is impaired, the residual fluid accumulates in the perihilar lymphatics and interlobar fissures, leading to decreased lung compliance and tachypnea. **Analysis of Options:** * **Respiratory Distress Syndrome (RDS):** Caused by a **deficiency of surfactant**, primarily in preterm infants. It is a restrictive lung disease characterized by alveolar collapse, not fluid retention. * **Meconium Aspiration Syndrome (MAS):** Occurs when a neonate aspirates meconium-stained amniotic fluid, leading to airway obstruction, chemical pneumonitis, and surfactant inactivation. It is usually seen in post-term or term infants with fetal distress. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Cesarean section (lack of thoracic squeeze), maternal asthma, and maternal diabetes. * **Chest X-ray Findings:** Characteristically shows **perihilar streaking** (sunburst appearance), fluid in the **interlobar fissures**, and occasional pleural effusion. * **Clinical Course:** It is a self-limiting condition. Tachypnea usually appears within 2 hours of birth and resolves spontaneously within 48–72 hours. * **Management:** Supportive care (oxygen via hood or nasal cannula); rarely requires CPAP.

Q: What is the definitive test for the diagnosis of neonatal sepsis?

Blood culture. **Explanation:** **1. Why Blood Culture is the Correct Answer:** In neonatology, **Blood Culture** is considered the **gold standard** and definitive test for diagnosing neonatal sepsis. The isolation of a pathogenic microorganism from a sterile site (blood) provides irrefutable evidence of systemic infection. It not only confirms the diagnosis but also identifies the specific causative organism and its antibiotic sensitivity, allowing for targeted therapy. **2. Analysis of Incorrect Options:** * **Urine Culture:** While important in late-onset sepsis (after 72 hours), it is rarely positive in early-onset sepsis and is not the primary definitive test for systemic infection. * **Immature:Total (I:T) Neutrophil Ratio:** This is a component of the hematological profile. An I:T ratio **>0.2** is a sensitive indicator of sepsis but lacks the specificity to be definitive. * **Sepsis Screen:** This is a bedside tool used to *exclude* or *suspect* sepsis. It typically includes CRP, TLC, ANC, I:T ratio, and micro-ESR. While it helps in the decision to start antibiotics, it does not provide a definitive microbiological diagnosis. **3. Clinical Pearls for NEET-PG:** * **Volume Matters:** For optimal yield in neonates, at least **1 mL** of blood should be collected for culture. * **Sepsis Screen Positivity:** A screen is considered positive if **two or more** parameters are abnormal. It has a high **Negative Predictive Value (NPV)**, meaning if the screen is negative, sepsis is unlikely. * **Most Common Organisms:** In India, *Klebsiella* is the most common cause of neonatal sepsis, whereas, in the West, Group B Streptococcus (GBS) is more prevalent. * **CSF Culture:** Should always be performed if sepsis is suspected, as 10-15% of neonates with sepsis may have associated meningitis.

Question 1

What is the management of a newborn when the mother has active Tuberculosis and is taking Anti-Tuberculosis Treatment (ATT)?

Accepted Answer

BCG vaccination, Isoniazid (INH) for 6 weeks, and Breast Feeding

Answer

BCG vaccination, Rifampicin, Isoniazid (INH), and Breast Feeding

Answer

BCG vaccination and Isolation of the baby

Answer

BCG vaccination, Isoniazid (INH), and withholding Breast Feeding

Question 2

A large for date baby may be due to which of the following conditions?

Accepted Answer

All of the above

Answer

Beckwith-Wiedemann syndrome

Answer

Diabetic mother

Answer

Genetic predisposition

Question 3

What is the normal cardiac output of a newborn?

Accepted Answer

350 ml/kg/min

Answer

200 ml/kg/min

Answer

250 ml/kg/min

Answer

300 ml/kg/min

Question 4

Deficiency of surfactant is seen in which of the following conditions?

Accepted Answer

Hyaline membrane disease (HMD)

Answer

Bronchopulmonary dysplasia (BPD)

Answer

Neonatal asphyxia

Answer

Anencephaly

Question 5

In which of the following conditions are steroids NOT indicated for treatment?

Accepted Answer

Intraventricular hemorrhage

Answer

Hypercalcemia

Answer

Respiratory distress

Answer

Enterocolitis

Question 6

Gastroschisis is associated with:

Accepted Answer

Younger maternal age

Answer

Maternal obesity

Answer

Elderly primigravida

Answer

Anemia

Question 7

Delayed removal or absorption of amniotic fluid from the pulmonary system results in which condition?

Accepted Answer

Transient tachypnea of the newborn

Answer

Respiratory distress syndrome

Answer

Meconium aspiration syndrome

Answer

None of the above

Question 8

What is the definitive test for the diagnosis of neonatal sepsis?

Accepted Answer

Blood culture

Answer

Urine culture

Answer

Immature:Total neutrophil ratio

Answer

Sepsis screen

Question 9

A neonate presents with respiratory distress, contralateral mediastinal shift, and multiple cystic air-filled lesions in the chest. What is the most likely diagnosis?

Accepted Answer

Congenital diaphragmatic hernia

Answer

Pneumonia

Answer

Congenital Lung Cyst

Answer

Congenital lobar Emphysema

Question 10

What is the best next step in managing a breastfed infant with jaundice?

Accepted Answer

Increase feeding duration to 15-20 minutes every 2 hours

Answer

Start phototherapy

Answer

Perform exchange transfusion

Answer

Switch to cow's milk formula

Neonatology — MCQs

Neonatology — MCQs

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