Neonatology Practice Questions

Q: With reference to Respiratory Distress Syndrome (RDS), all of the following statements are true EXCEPT:

Is treated by administering 100% oxygen.. ### Explanation **Respiratory Distress Syndrome (RDS)**, also known as Hyaline Membrane Disease, is primarily caused by a deficiency of pulmonary surfactant in preterm neonates. **Why Option D is the Correct Answer (The False Statement):** Administering **100% oxygen** is contraindicated in the management of RDS. High concentrations of supplemental oxygen in preterm neonates lead to the production of free radicals, causing oxidative stress. This significantly increases the risk of **Retinopathy of Prematurity (ROP)** and **Bronchopulmonary Dysplasia (BPD)**. The goal of treatment is to maintain oxygen saturation ($SpO_2$) between **91% and 95%** using the lowest possible fraction of inspired oxygen ($FiO_2$). **Analysis of Other Options:** * **Option A:** RDS is inversely proportional to gestational age. It most commonly affects infants born **before 34 weeks**, as surfactant production by Type II pneumocytes only reaches maturity after 35 weeks. * **Option B:** Infants of diabetic mothers (IDM) are at higher risk because **hyperinsulinemia** in the fetus antagonizes the action of cortisol, thereby delaying surfactant synthesis. * **Option C:** RDS leads to alveolar collapse (atelectasis), resulting in a ventilation-perfusion (V/Q) mismatch and right-to-left shunting, which clinically manifests as **cyanosis**. **NEET-PG High-Yield Pearls:** * **L/S Ratio:** A Lecithin/Sphingomyelin ratio of **>2:1** in amniotic fluid indicates lung maturity. * **Ground Glass Opacity:** The classic X-ray finding in RDS is a diffuse reticulogranular pattern with **air bronchograms**. * **Treatment of Choice:** Early application of **Nasal CPAP** and exogenous **Surfactant replacement therapy** (e.g., Poractant alfa) via the INSURE technique (Intubate-Surfactant-Extubate). * **Prevention:** Antenatal corticosteroids (Dexamethasone or Betamethasone) administered to the mother at risk of preterm labor.

Q: A 28-year-old woman gave birth to a small for gestational age newborn at 38 weeks of pregnancy. On examination, the newborn was found to have rhinitis, a distended abdomen, wrinkled skin, and palmoplantar blisters. The woman had an earlier history of abortion and stillbirth. What is the most likely diagnosis?

Congenital syphilis. ### Explanation The clinical presentation described is classic for **Early Congenital Syphilis** (symptoms appearing before 2 years of age). **Why Congenital Syphilis is correct:** The diagnosis is based on a constellation of pathognomonic findings: * **Rhinitis (Snuffles):** A highly infectious, blood-tinged mucopurulent discharge; often the earliest sign. * **Skin Lesions:** Palmoplantar bullae (Pemphigus syphiliticus) and wrinkled skin (due to intrauterine growth restriction) are characteristic. * **Abdominal Distension:** Typically due to hepatosplenomegaly. * **Obstetric History:** Recurrent abortions and stillbirths are hallmark indicators of untreated maternal syphilis. **Why the other options are incorrect:** * **Neonatal Pemphigus:** This is a rare transient condition caused by the placental transfer of maternal IgG antibodies (Pemphigus vulgaris). It presents with flaccid bullae but lacks systemic features like snuffles or hepatosplenomegaly. * **Scabies:** While it can cause vesicles and pustules in infants (including palms/soles), it does not cause rhinitis, SGA, or the specific obstetric history mentioned. * **Congenital HIV:** Usually asymptomatic at birth. Clinical features like lymphadenopathy and failure to thrive typically develop later in infancy. It does not cause palmoplantar blisters. **High-Yield Clinical Pearls for NEET-PG:** * **Hutchinson’s Triad (Late Syphilis):** Interstitial keratitis, Sensorineural hearing loss (8th nerve deafness), and Hutchinson’s teeth (notched incisors). * **Radiological Signs:** Wimberger’s sign (localized erosion of the medial proximal tibia) and periostitis. * **Screening/Diagnosis:** VDRL/RPR for screening; FTA-ABS or TP-PA for confirmation. * **Treatment of Choice:** Aqueous Crystalline Penicillin G.

Q: A premature baby of 34 weeks gestation was delivered and developed bullous lesions on the skin. Radiographs show periostitis. What should be the next investigation?

VDRL for mother and baby. The clinical presentation of a premature neonate with **bullous skin lesions** (Pemphigus syphiliticus) and **periostitis** is a classic triad for **Congenital Syphilis**. ### **Why Option A is Correct** Congenital syphilis is caused by the transplacental transmission of *Treponema pallidum*. * **Skin Lesions:** The characteristic rash often involves bullae or maculopapular lesions, typically on the palms and soles. * **Radiological Findings:** Bone involvement is seen in 90% of symptomatic infants. **Periostitis** and osteochondritis (e.g., Wimberger’s sign) are hallmark features. * **Diagnosis:** The initial screening step is performing non-treponemal tests (**VDRL or RPR**) on both the mother and the baby. A neonatal titer fourfold higher than the maternal titer is highly suggestive of infection. ### **Why Other Options are Incorrect** * **B (HIV):** While HIV can be transmitted vertically, it typically presents later with failure to thrive, lymphadenopathy, and opportunistic infections, not acute bullous lesions or periostitis. * **C (TB):** Congenital Tuberculosis usually presents with hepatosplenomegaly, respiratory distress, and fever; it does not cause bullous skin disease. * **D (Hepatitis B):** Neonatal Hep-B is usually asymptomatic at birth and is managed with vaccination and HBIG; it does not present with skeletal or dermatological abnormalities. ### **NEET-PG High-Yield Pearls** * **Early Congenital Syphilis ( 2 years):** Hutchinson’s triad (interstitial keratitis, sensorineural deafness, and Hutchinson’s teeth), Mulberry molars, and Sabre shin. * **Treatment of Choice:** Intravenous **Penicillin G** for 10 days.

Q: IUGR is characterized by all EXCEPT?

Hyaline membrane disease. **Explanation:** Intrauterine Growth Restriction (IUGR) occurs when a fetus does not reach its biological growth potential due to placental, maternal, or fetal factors. **Why Hyaline Membrane Disease (HMD) is the correct answer:** HMD, also known as Respiratory Distress Syndrome (RDS), is primarily a disease of **prematurity** caused by surfactant deficiency. In IUGR, the fetus undergoes chronic intrauterine stress. This stress triggers an increased release of **endogenous maternal and fetal glucocorticoids (cortisol)**, which accelerates fetal lung maturation and surfactant production. Consequently, IUGR infants actually have a **decreased risk** of HMD compared to non-IUGR infants of the same gestational age. **Analysis of Incorrect Options:** * **Polycythemia:** Chronic fetal hypoxia in IUGR stimulates erythropoietin production, leading to an increased red cell mass. * **Meconium Aspiration Syndrome (MAS):** Hypoxia-induced fetal distress causes the passage of meconium in utero and gasping movements, making MAS a common complication. * **Hypocalcemia:** This occurs due to reduced placental transfer of calcium and a transiently blunted parathyroid hormone response post-delivery. **High-Yield Clinical Pearls for NEET-PG:** * **Most common metabolic complication in IUGR:** Hypoglycemia (due to low glycogen stores and impaired gluconeogenesis). * **Ponderal Index:** Used to differentiate between Symmetrical and Asymmetrical IUGR. * **Asymmetrical IUGR:** Most common type; characterized by "Head Sparing" (normal head circumference but low birth weight). * **Other complications:** Hypothermia, Hyperviscosity syndrome, and Pulmonary hemorrhage.

Q: What wavelength is used in the given instrument to treat neonatal pathology?

470 nm. ***470 nm*** - This wavelength falls within the **therapeutic blue light range** (450-490 nm) used in **phototherapy units** for treating neonatal jaundice. - **Blue light** at this wavelength effectively converts **unconjugated bilirubin** to water-soluble photoisomers that can be excreted without conjugation. *360 nm* - This wavelength represents **UV-A light**, which is outside the therapeutic range for **neonatal phototherapy**. - **UV light** can cause skin damage and is not used for treating **neonatal hyperbilirubinemia**. *540 nm* - This wavelength corresponds to **green light**, which is less effective than blue light for **bilirubin photoisomerization**. - **Green light** has minimal therapeutic benefit and is not the standard wavelength used in **phototherapy units**. *230 nm* - This wavelength represents **far UV-C light**, which is highly dangerous and can cause severe **DNA damage** and skin burns. - **Far UV light** has no therapeutic role in neonatal care and would be harmful to newborns.

Q: All of the following are causes of bronchopulmonary dysplasia except?

Theophylline use. **Explanation:** **Bronchopulmonary Dysplasia (BPD)** is a chronic lung disease primarily affecting preterm infants who require prolonged mechanical ventilation and oxygen therapy. **Why Theophylline is the correct answer:** Theophylline (and other methylxanthines like Caffeine) is actually used in the **prevention and management** of apnea of prematurity and to facilitate weaning from mechanical ventilation. By stimulating the respiratory center and improving diaphragmatic contractility, it helps reduce the duration of ventilation, thereby potentially **decreasing** the risk of BPD rather than causing it. **Analysis of Incorrect Options:** * **Oxygen Toxicity (A):** High concentrations of inspired oxygen ($FiO_2$) lead to the production of reactive oxygen species (free radicals). Preterm neonates have immature antioxidant enzyme systems, leading to oxidative stress and alveolar-capillary damage. * **Traumatic Damage (C):** Also known as **Volutrauma** or **Barotrauma**. High tidal volumes and peak inspiratory pressures from mechanical ventilation cause physical shearing of the alveoli and inflammation, a hallmark in BPD pathogenesis. * **Pulmonary Edema (D):** Inflammation and capillary leak lead to interstitial and alveolar edema. This impairs gas exchange and triggers a fibroproliferative response, leading to the characteristic "bubbly" appearance on X-ray. **NEET-PG High-Yield Pearls:** * **Definition:** BPD is defined as the need for supplemental oxygen at **36 weeks post-menstrual age (PMA)** or for more than 28 days of life. * **Radiology:** Classic "sponge-like" or "bubbly" appearance with areas of opacification and lucency. * **Prevention:** Antenatal steroids, early use of surfactant, and "gentle ventilation" (permissive hypercapnia) are key strategies. * **Drug of Choice:** **Caffeine citrate** is preferred over Theophylline due to a wider therapeutic index and longer half-life.

Q: What is the most common presentation of congenital Cytomegalovirus (CMV) infection?

Hepatosplenomegaly. **Explanation:** Congenital Cytomegalovirus (CMV) is the most common intrauterine infection worldwide. While approximately 90% of affected neonates are asymptomatic at birth, among those who are **symptomatic**, **Hepatosplenomegaly** is the most frequent clinical finding (occurring in approximately 60-80% of cases). **Why Hepatosplenomegaly is correct:** CMV has a tropism for the reticuloendothelial system. In utero, the virus causes extramedullary hematopoiesis and inflammatory infiltration of the liver and spleen, leading to enlargement. It is often accompanied by jaundice and petechiae (blueberry muffin rash). **Analysis of Incorrect Options:** * **B. Microcephaly:** While a classic feature of the "TORCH" spectrum and a significant marker of poor neurodevelopmental prognosis, it occurs less frequently (approx. 40-50%) than visceral enlargement. * **C. Cerebral calcification:** In CMV, these are typically **periventricular** in distribution. While highly characteristic and a favorite for radiology-based questions, they are present in only about 30-40% of symptomatic cases. * **D. Chorioretinitis:** This is a common late manifestation or a finding in severe cases (approx. 10-20%), but it is significantly less common than hepatosplenomegaly or jaundice. **High-Yield Clinical Pearls for NEET-PG:** * **Most common overall presentation:** Asymptomatic (90%). * **Most common symptomatic presentation:** Hepatosplenomegaly. * **Most common long-term sequela:** Sensorineural Hearing Loss (SNHL)—CMV is the leading non-genetic cause of SNHL in children. * **Radiology Key:** Look for **Periventricular calcifications** (distinguish from Toxoplasmosis, which shows diffuse/scattered calcifications). * **Diagnosis:** Gold standard is **Viral culture or PCR of saliva/urine** within the first 3 weeks of life.

Q: During neonatal resuscitation of a spontaneously breathing preterm baby of 30 weeks gestation with labored breathing, oxygen delivery can be achieved by which of the following methods?

CPAP using T-pieces. **Explanation:** The core principle in neonatal resuscitation of preterm infants is the preservation of lung volume and the prevention of alveolar collapse. According to the latest **NRP (Neonatal Resuscitation Program) guidelines**, if a preterm baby is breathing spontaneously but has labored breathing or persistent cyanosis, the initial management of choice is **Continuous Positive Airway Pressure (CPAP)**. **1. Why CPAP using T-piece is correct:** A T-piece resuscitator (like a Neopuff) is the preferred device for delivering CPAP in the delivery room. It provides a consistent, controlled **Positive End-Expiratory Pressure (PEEP)**, which helps maintain Functional Residual Capacity (FRC), keeps the surfactant-deficient preterm alveoli open, and reduces the work of breathing. **2. Why other options are incorrect:** * **Endotracheal Intubation (A):** This is an invasive procedure reserved for babies who fail to respond to CPAP/PPV or require prolonged ventilation. Current trends favor non-invasive respiratory support to prevent Bronchopulmonary Dysplasia (BPD). * **Laryngeal Mask Airway (B):** While useful for rescue ventilation, LMAs are generally not recommended for infants born before **34 weeks gestation** or weighing less than 1500g due to size constraints. * **Self-inflating bag (D):** This device **cannot provide CPAP** or PEEP unless a specific PEEP valve is attached. Even with a valve, it cannot provide PEEP to a spontaneously breathing patient who is not being bagged. **Clinical Pearls for NEET-PG:** * **Golden Hour:** The first 60 minutes of a preterm neonate's life are critical; early CPAP is a key component. * **Target SpO2:** Do not aim for 100% saturation. At 1 minute of life, the target is 60-65%; at 10 minutes, it is 85-95%. * **T-piece Advantage:** Unlike a self-inflating bag, a T-piece can deliver 100% FiO2 and precise inspiratory pressures (PIP).

Q: A very preterm baby on 30mL/kg of enteral feeding developed sudden severe abdominal distension with visible bowel loops on day 6 of life. The baby also showed temperature instability and lethargy. X-ray of the abdomen showed portal venous gas. What is the staging of NEC?

Stage IIb. This question tests your knowledge of **Bell’s Staging Criteria for Necrotizing Enterocolitis (NEC)**, a critical topic for NEET-PG. ### **Explanation of the Correct Answer** The correct answer is **Stage IIb (Moderate NEC)**. According to Bell’s criteria, NEC is staged based on systemic, intestinal, and radiological findings: * **Systemic signs:** The baby has temperature instability and lethargy. * **Intestinal signs:** Severe abdominal distension and visible bowel loops indicate significant intestinal involvement. * **Radiological signs:** The presence of **portal venous gas** is the pathognomonic feature that upgrades the diagnosis from Stage IIa to **Stage IIb**. ### **Why Other Options are Incorrect** * **Stage I (Suspected NEC):** Presents with non-specific systemic signs (apnea, bradycardia) and mild gastric residuals. X-ray is usually normal or shows non-specific dilation. * **Stage IIa (Mild NEC):** Characterized by absent bowel sounds and tenderness. The hallmark radiological finding is **pneumatosis intestinalis** (air in the bowel wall), but *not* portal venous gas. * **Stage IIIa (Advanced NEC):** This stage represents "intact bowel" but with severe systemic illness (septic shock, respiratory acidosis, or DIC). Stage IIIb is characterized by **pneumoperitoneum** (perforation). ### **High-Yield Clinical Pearls for NEET-PG** 1. **Pathognomonic X-ray findings:** * Pneumatosis intestinalis = Stage IIa. * Portal venous gas = Stage IIb. * Pneumoperitoneum (Football sign/Rigler sign) = Stage IIIb. 2. **Management:** Stage I and II are managed medically (NPO, antibiotics, TPN). Stage IIIb (perforation) is an absolute indication for surgery. 3. **Risk Factors:** Prematurity and rapid advancement of enteral feeds are the most significant triggers. 4. **Most common site:** Terminal ileum and proximal colon.

Question 1

With reference to Respiratory Distress Syndrome (RDS), all of the following statements are true EXCEPT:

Accepted Answer

Is treated by administering 100% oxygen.

Answer

Usually occurs in infants born before 34 weeks of gestation.

Answer

Is more common in babies born to diabetic mothers.

Answer

Leads to cyanosis.

Question 2

A 28-year-old woman gave birth to a small for gestational age newborn at 38 weeks of pregnancy. On examination, the newborn was found to have rhinitis, a distended abdomen, wrinkled skin, and palmoplantar blisters. The woman had an earlier history of abortion and stillbirth. What is the most likely diagnosis?

Accepted Answer

Congenital syphilis

Answer

Neonatal pemphigus

Answer

Scabies

Answer

Congenital HIV infection

Question 3

Which of the following skin changes in a newborn disappear spontaneously?

Accepted Answer

All of the above

Answer

Harlequin skin change

Answer

Mongolian spots

Answer

Erythema toxicum

Question 4

A premature baby of 34 weeks gestation was delivered and developed bullous lesions on the skin. Radiographs show periostitis. What should be the next investigation?

Accepted Answer

VDRL for mother and baby

Answer

ELISA for HIV

Answer

PCR for TB

Answer

Hepatitis B surface antigen for mother

Question 5

IUGR is characterized by all EXCEPT?

Accepted Answer

Hyaline membrane disease

Answer

Polycythemia

Answer

Meconium aspiration syndrome

Answer

Hypocalcemia

Question 6

What wavelength is used in the given instrument to treat neonatal pathology?

Accepted Answer

470 nm

Answer

360 nm

Answer

540 nm

Answer

230 nm

Question 7

All of the following are causes of bronchopulmonary dysplasia except?

Accepted Answer

Theophylline use

Answer

Oxygen toxicity

Answer

Traumatic damage to lungs

Answer

Pulmonary edema due to capillary damage

Question 8

What is the most common presentation of congenital Cytomegalovirus (CMV) infection?

Accepted Answer

Hepatosplenomegaly

Answer

Microcephaly

Answer

Cerebral calcification

Answer

Chorioretinitis

Question 9

During neonatal resuscitation of a spontaneously breathing preterm baby of 30 weeks gestation with labored breathing, oxygen delivery can be achieved by which of the following methods?

Accepted Answer

CPAP using T-pieces

Answer

Endotracheal intubation

Answer

Laryngeal mask airway

Answer

Self-inflating bag

Question 10

A very preterm baby on 30mL/kg of enteral feeding developed sudden severe abdominal distension with visible bowel loops on day 6 of life. The baby also showed temperature instability and lethargy. X-ray of the abdomen showed portal venous gas. What is the staging of NEC?

Accepted Answer

Stage IIb

Answer

Stage I

Answer

Stage IIa

Answer

Stage IIIa

Neonatology — MCQs

Neonatology — MCQs

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