Neonatology Practice Questions

Q: A 26-year-old multigravida mother delivered a male baby weighing 4.2 kg at 37 weeks of gestation via emergency cesarean section for obstructed labor. One hour after birth, the child developed respiratory distress. He was kept nil per os (NPO) and received intravenous fluids. He maintained oxygen saturation on room air. No antibiotics were administered. A chest radiograph revealed fluid in the interlobar fissure. The respiratory distress resolved by 24 hours of life. What is the most likely diagnosis?

Transient tachypnea of the newborn. ### Explanation **Correct Option: A. Transient Tachypnea of the Newborn (TTN)** TTN, also known as "Wet Lung Syndrome," is caused by the **delayed clearance of fetal lung fluid**. Under normal circumstances, the "thoracic squeeze" during vaginal delivery and catecholamine-induced activation of epithelial sodium channels (ENaC) help resorb this fluid. * **Clinical Context:** Risk factors in this case include **Cesarean section** (missing the thoracic squeeze) and **macrosomia** (4.2 kg). * **Radiology:** The pathognomonic finding is **fluid in the interlobar fissures**, prominent vascular markings (perihilar streaking), and occasionally pleural effusion. * **Course:** It is a benign, self-limiting condition that typically resolves within 24–72 hours with supportive care (NPO, oxygen). **Why Incorrect Options are Wrong:** * **B. Meconium Aspiration Syndrome (MAS):** Usually occurs in post-term infants with a history of meconium-stained liquor. X-ray shows "patchy opacities" and hyperinflation, not simple fissure fluid. * **C. Persistent Fetal Circulation (PPHN):** Characterized by severe cyanosis and a significant difference between pre-ductal and post-ductal oxygen saturation. It does not resolve spontaneously within 24 hours. * **D. Hyaline Membrane Disease (RDS):** Primarily affects **preterm** infants due to surfactant deficiency. X-ray classically shows a "ground-glass appearance" and air bronchograms. **High-Yield Pearls for NEET-PG:** * **Most common cause** of respiratory distress in term neonates: TTN. * **Key Risk Factors:** Elective C-section, maternal diabetes, and male sex. * **Management:** Supportive. If distress lasts >72 hours, reconsider the diagnosis. * **X-ray Buzzword:** "Sunburst appearance" or "Starry sky" (perihilar streaking) and fluid in the horizontal fissure.

Q: CSF examination in a one-day-old term male infant with convulsions reveals cell count -- 10 RBCs/HPF, 50 cells; protein -- 70 mg/dl; sugar -- 30 mg/dl. Blood sugar is 40 mg/dl. What is the most likely diagnosis?

Intracranial bleed. ### Explanation The correct answer is **Intracranial bleed (Option B)**. To arrive at the diagnosis, we must analyze the CSF parameters in the context of a neonate: 1. **CSF Sugar/Blood Sugar Ratio:** The patient’s CSF sugar is 30 mg/dl and blood sugar is 40 mg/dl. This gives a ratio of **0.75 (75%)**. In bacterial meningitis, the CSF sugar is typically significantly decreased (usually <50% of blood glucose). A ratio of 0.75 is considered normal for a neonate. 2. **Protein Levels:** A protein level of 70 mg/dl is within the **normal range** for a term neonate (normal can be up to 100–150 mg/dl in the first week of life). 3. **Cell Count and RBCs:** The presence of **10 RBCs/HPF** in the CSF of a neonate presenting with convulsions is the most significant finding here. While a "traumatic tap" is a possibility, in the context of neonatal seizures, it strongly points toward an intracranial hemorrhage (such as intraventricular or subarachnoid hemorrhage). #### Why other options are incorrect: * **Meningitis:** Although the cell count (50 cells) is slightly elevated, the normal protein and the high CSF/Blood glucose ratio (75%) make acute bacterial meningitis unlikely. * **Hypoglycemia:** While the blood sugar is 40 mg/dl (borderline low), the question asks for a diagnosis based on the **CSF examination**. The presence of RBCs in the CSF cannot be explained by hypoglycemia alone. #### High-Yield Clinical Pearls for NEET-PG: * **Normal Neonatal CSF:** Term infants can normally have up to 20–30 WBCs/mm³ and protein up to 150 mg/dl. * **CSF/Blood Glucose Ratio:** In neonates, the normal ratio is 0.6 to 0.9. A ratio **<0.5** is highly suggestive of meningitis. * **Xanthochromia:** If the CSF was centrifuged, the presence of yellowish discoloration (xanthochromia) would confirm an older intracranial bleed rather than a traumatic tap.

Q: An 8-hour-old term infant develops increased respiratory distress, hypothermia, and hypotension. A complete blood count (CBC) demonstrates a white blood cell (WBC) count of 2500/mL with 80% bands. The chest radiograph is shown below. Which of the following is the most likely diagnosis?

Group B streptococcal pneumonia. ***Group B streptococcal pneumonia*** - **Leukopenia** (WBC 2500/mL) with **80% bands** in a term neonate within the first 24 hours is the hallmark of **early-onset GBS sepsis/pneumonia**. - Clinical presentation of **respiratory distress**, **hypothermia**, and **hypotension** with bilateral granular infiltrates on chest X-ray mimicking **RDS** in a term infant strongly suggests GBS pneumonia. *Congenital syphilis* - Typically presents with **hepatosplenomegaly**, **skin rashes**, and **osteochondritis**, not acute respiratory distress in the immediate newborn period. - **Normal WBC count** or lymphocytosis is more common, not severe leukopenia with left shift. *Diaphragmatic hernia* - Chest X-ray would show **bowel loops in the thoracic cavity** and **mediastinal shift**, not bilateral granular infiltrates. - **WBC count** would typically be normal unless secondary complications develop. *Transient tachypnea of the newborn* - Occurs in **term infants** born via **cesarean section** with **streaky perihilar markings** on chest X-ray, not bilateral granular infiltrates. - **Normal WBC count** and absence of systemic signs like hypothermia and hypotension distinguish it from sepsis.

Q: A 7-day-old premature infant born at 26 weeks of gestation presents with grossly bloody stool, abdominal distention, and increasing oxygen requirements. What is the best initial diagnostic step in evaluating this patient's apparent gastrointestinal hemorrhage?

Abdominal series. **Explanation:** The clinical presentation of a premature infant (26 weeks) with abdominal distention, bloody stools, and systemic instability (increased oxygen requirements) is highly suggestive of **Necrotizing Enterocolitis (NEC)**. **1. Why Abdominal Series is Correct:** The "Abdominal Series" (consisting of AP, lateral decubitus, or left lateral views) is the **gold standard initial diagnostic step** for suspected NEC. It is used to identify pathognomonic findings such as **Pneumatosis intestinalis** (gas within the bowel wall), portal venous gas, or **Pneumoperitoneum** (indicating perforation). In a neonate with these symptoms, ruling out a surgical emergency like perforation is the immediate priority. **2. Why Other Options are Incorrect:** * **Fiberoptic endoscopy:** This is contraindicated in suspected NEC due to the high risk of bowel perforation from air insufflation and the friable nature of the inflamed mucosa. * **Apt test:** This test distinguishes between swallowed maternal blood and neonatal gastrointestinal bleeding. While useful in a healthy neonate with "bloody spit-up" on day 1, it is irrelevant in a 7-day-old premature infant showing signs of systemic illness and NEC. * **Routine stool culture:** While infections can trigger NEC, cultures take 48–72 hours and do not provide the immediate diagnostic information required to manage an acute abdomen. **Clinical Pearls for NEET-PG:** * **Bell’s Staging:** Used to classify the severity of NEC. * **Most common site:** Terminal ileum and proximal colon. * **Radiological Hallmark:** Pneumatosis intestinalis (Stage II). * **Absolute indication for surgery:** Pneumoperitoneum (Football sign on X-ray). * **Risk Factors:** Prematurity (most common), formula feeding, and intestinal ischemia.

Q: A newborn term baby born by vaginal delivery has respiratory distress, grunting, and a scaphoid abdomen. What is the most probable diagnosis?

Diaphragmatic hernia. **Explanation:** The clinical triad of **respiratory distress, a scaphoid abdomen, and a term delivery** is the classic presentation of **Congenital Diaphragmatic Hernia (CDH)**. **1. Why Diaphragmatic Hernia is correct:** In CDH (most commonly the Bochdalek type on the left side), there is a defect in the diaphragm allowing abdominal viscera (stomach, intestines, spleen) to herniate into the thoracic cavity. This results in: * **Scaphoid Abdomen:** The abdomen appears sunken because the abdominal contents have migrated into the chest. * **Respiratory Distress:** Caused by secondary pulmonary hypoplasia and mechanical compression of the lungs by the herniated organs. * **Physical Signs:** Shifted apex beat (mediastinal shift) and bowel sounds heard in the chest. **2. Why other options are incorrect:** * **Hyaline Membrane Disease (HMD):** Typically occurs in **preterm** infants due to surfactant deficiency. The abdomen is usually normal or distended, not scaphoid. * **Pneumothorax:** While it causes acute respiratory distress and mediastinal shift, it does not cause a scaphoid abdomen. It is often a complication of positive pressure ventilation. * **Meconium Aspiration Syndrome (MAS):** Occurs in term/post-term babies with meconium-stained liquor. It presents with a "barrel chest" (hyperinflation) rather than a scaphoid abdomen. **Clinical Pearls for NEET-PG:** * **Most common site:** Left side (Bochdalek hernia) through the pleuroperitoneal canal. * **Initial Management:** Immediate **endotracheal intubation**. * **Contraindication:** Avoid **Bag and Mask ventilation**, as it distends the herniated bowel with air, further compressing the lungs. * **X-ray finding:** Air-filled loops of bowel in the hemithorax.

Q: A preterm baby is born with synchronized upper chest movement, minimal nasal flare, expiratory grunting heard by stethoscope, but has no chest or xiphoid retractions. What is the Silverman score?

2. The **Silverman-Anderson Scoring System** is a clinical tool used to assess the severity of respiratory distress in neonates, particularly preterm infants. Unlike the Apgar score, a **higher Silverman score indicates greater respiratory distress** (0 is normal, 10 is maximum distress). ### **Step-by-Step Calculation for this Case:** The score evaluates five parameters, each graded 0, 1, or 2: 1. **Upper Chest Movement:** Synchronized movement = **0** (Lag = 1; See-saw = 2). 2. **Lower Chest Retractions:** None = **0** (Just visible = 1; Marked = 2). 3. **Xiphoid Retractions:** None = **0** (Just visible = 1; Marked = 2). 4. **Nasal Flaring:** Minimal = **1** (None = 0; Marked = 2). 5. **Expiratory Grunt:** Heard by stethoscope only = **1** (None = 0; Heard by naked ear = 2). **Total Score: 0 + 0 + 0 + 1 + 1 = 2.** ### **Analysis of Options:** * **Option A (1):** Incorrect. This would only account for either the nasal flare or the grunt, but not both. * **Option B (2):** **Correct.** The sum of minimal nasal flare (1) and grunting via stethoscope (1) equals 2. * **Option C & D (3 & 4):** Incorrect. These scores would require additional findings such as visible retractions or audible grunting without a stethoscope. ### **NEET-PG High-Yield Pearls:** * **Interpretation:** Score 0 (None); Score 1–3 (Mild distress); Score 4–6 (Moderate distress); Score >6 (Severe distress); Score 10 (Impending respiratory failure). * **Mnemonic:** Remember **"Upper-Lower-Xiphoid-Nose-Grunt"** to sequence the parameters. * **Clinical Correlation:** While Apgar assesses transition and depression, Silverman specifically monitors the work of breathing. It is the gold standard for assessing RDS (Respiratory Distress Syndrome) in preterms.

Q: Macrosomia is defined as:

A baby weighing more than 4000 grams. **Explanation:** **Macrosomia** is a term used to describe a neonate who is significantly larger than average. In clinical practice and per standard pediatric guidelines, it is defined as a birth weight **greater than 4000 grams** (some definitions use 4500g), regardless of the gestational age. This condition is most commonly associated with maternal diabetes mellitus, where fetal hyperinsulinism acts as a growth hormone, leading to increased fat deposition and organomegaly. **Analysis of Options:** * **Option A (Correct):** This is the standard anthropometric definition. It is distinct from "Large for Gestational Age" (LGA), which refers to a weight above the 90th percentile for a specific gestational age. * **Option B:** A large mouth is termed **macrostomia**, often seen in syndromes like Treacher Collins or Beckwith-Wiedemann, but it does not define macrosomia. * **Option C:** A large head circumference is termed **macrocephaly**, which can be associated with hydrocephalus or skeletal dysplasias. * **Option D:** A large tongue is termed **macroglossia**, a classic feature of Beckwith-Wiedemann Syndrome and Congenital Hypothyroidism. **High-Yield NEET-PG Pearls:** 1. **Most Common Cause:** Maternal Diabetes (Gestational or Pre-gestational). 2. **Complications:** Shoulder dystocia, brachial plexus injury (Erb’s palsy), birth asphyxia, and neonatal hypoglycemia. 3. **Beckwith-Wiedemann Syndrome:** A high-yield differential featuring macrosomia, macroglossia, omphalocele, and Wilms tumor. 4. **Ponderal Index:** Used to differentiate between "symmetric" and "asymmetric" growth; macrosomic infants of diabetic mothers typically show asymmetric growth (increased weight-to-length ratio).

Question 1

A 26-year-old multigravida mother delivered a male baby weighing 4.2 kg at 37 weeks of gestation via emergency cesarean section for obstructed labor. One hour after birth, the child developed respiratory distress. He was kept nil per os (NPO) and received intravenous fluids. He maintained oxygen saturation on room air. No antibiotics were administered. A chest radiograph revealed fluid in the interlobar fissure. The respiratory distress resolved by 24 hours of life. What is the most likely diagnosis?

Accepted Answer

Transient tachypnea of the newborn

Answer

Meconium aspiration syndrome

Answer

Persistent fetal circulation

Answer

Hyaline membrane disease

Question 2

CSF examination in a one-day-old term male infant with convulsions reveals cell count -- 10 RBCs/HPF, 50 cells; protein -- 70 mg/dl; sugar -- 30 mg/dl. Blood sugar is 40 mg/dl. What is the most likely diagnosis?

Accepted Answer

Intracranial bleed

Answer

Meningitis

Answer

Hypoglycemia

Answer

None of the above

Question 3

A mother diagnosed with chickenpox delivered a healthy, afebrile, term infant 7 days ago. What is the most appropriate management step for the infant?

Accepted Answer

Advise the mother to continue regular baby care

Answer

Hospitalize the infant in an isolation ward

Answer

Administer acyclovir to the infant

Answer

Administer varicella-zoster immunoglobulin (VZIG) to the infant

Question 4

An 8-hour-old term infant develops increased respiratory distress, hypothermia, and hypotension. A complete blood count (CBC) demonstrates a white blood cell (WBC) count of 2500/mL with 80% bands. The chest radiograph is shown below. Which of the following is the most likely diagnosis?

Accepted Answer

Group B streptococcal pneumonia

Answer

Congenital syphilis

Answer

Diaphragmatic hernia

Answer

Transient tachypnea of the newborn

Question 5

An 8-hour-old term infant develops increased respiratory distress, hypothermia, and hypotension. A complete blood count (CBC) demonstrates a white blood cell (WBC) count of 2500/mL with 80% bands. The chest radiograph is shown below. Which of the following is the most likely diagnosis?

Accepted Answer

Group B streptococcal pneumonia

Answer

Congenital syphilis

Answer

Diaphragmatic hernia

Answer

Transient tachypnea of the newborn

Question 6

A 7-day-old premature infant born at 26 weeks of gestation presents with grossly bloody stool, abdominal distention, and increasing oxygen requirements. What is the best initial diagnostic step in evaluating this patient's apparent gastrointestinal hemorrhage?

Accepted Answer

Abdominal series

Answer

Fiberoptic endoscopy

Answer

Apt test

Answer

Routine stool culture

Question 7

Which of the following statements is FALSE regarding neonatal resuscitation?

Accepted Answer

A self-inflating bag should not be used without a reservoir.

Answer

T-piece resuscitator delivers free-flow oxygen.

Answer

A self-inflating bag can deliver free-flow oxygen.

Answer

A flow-inflating bag delivers free-flow oxygen.

Question 8

A newborn term baby born by vaginal delivery has respiratory distress, grunting, and a scaphoid abdomen. What is the most probable diagnosis?

Accepted Answer

Diaphragmatic hernia

Answer

Hyaline membrane disease (HMD)

Answer

Pneumothorax

Answer

Meconium aspiration syndrome

Question 9

A preterm baby is born with synchronized upper chest movement, minimal nasal flare, expiratory grunting heard by stethoscope, but has no chest or xiphoid retractions. What is the Silverman score?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 10

Macrosomia is defined as:

Accepted Answer

A baby weighing more than 4000 grams

Answer

A baby with a large mouth

Answer

A baby with a large head circumference

Answer

A baby with a large tongue

Neonatology — MCQs

Neonatology — MCQs

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