Neonatology Practice Questions

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).

Q: Which of the following is considered harmful to a newborn baby in the immediate postnatal period?

Giving a bath immediately after birth. ***Giving a bath immediately after birth***- Immediate bathing is associated with a high risk of **neonatal hypothermia** due to rapid evaporative heat loss, as newborns have immature thermoregulatory systems.- Current guidelines (e.g., WHO) recommend delaying bathing for at least 6 hours, and ideally 24 hours, to allow for temperature stabilization and to preserve the protective **vernix caseosa**.*Cleaning the eyes with a wet sterile swab*- This is standard practice, usually followed by applying prophylactic eye ointment (e.g., erythromycin), to prevent **ophthalmia neonatorum** caused by organisms like *Neisseria gonorrhoeae* or *Chlamydia trachomatis*.- It is a safe and necessary procedure to prepare the eyes for prophylaxis, ensuring the area is free of potentially infectious material.*Initiating breastfeeding within 1 hour*- Early initiation of breastfeeding is part of **Essential Newborn Care** and is highly beneficial, helping to stabilize the neonate's blood glucose levels and preventing **hypoglycemia**.- Colostrum provides crucial passive immunity and facilitates strong **maternal-infant bonding**, stimulating uterine involution in the mother.*Placing the baby on the mother's chest*- This practice, known as **skin-to-skin contact** (SSC), is vital for maintaining the baby's temperature, as the mother’s chest provides optimal **thermal regulation**.- SSC reduces infant stress, stabilizes heart rate and respiration, and greatly facilitates the transition to **early breastfeeding**.

Q: A newborn, born to a diabetic mother, presents after 24 hours of life with a blood glucose level of <35 mg/dL. The baby is symptomatic. What is the next best step in management?

Administer IV glucose and recheck blood glucose after 20 minutes. ***Administer IV glucose and recheck blood glucose after 20 minutes*** - Symptomatic hypoglycemia (blood glucose <40–45 mg/dL, often <35 mg/dL) requires immediate treatment with an **IV dextrose bolus** (typically D10W at 2 mL/kg) to rapidly correct the glucose deficit and prevent **neurological injury**. - After administering the IV bolus, the effectiveness of the treatment must be confirmed by repeating the blood glucose level measurement within 15–30 minutes (recheck after 20 minutes) to ensure target levels are maintained. *Administer IV bolus of Hartmann solution* - **Hartmann solution (Lactated Ringer's)** is an isotonic crystalloid mainly used for volume expansion and contains negligible dextrose, making it ineffective for treating severe, symptomatic **hypoglycemia**. - Using an IV fluid without sufficient glucose will lead to a dangerous delay in restoring adequate **cerebral glucose delivery**. *Recheck blood glucose after 20 minutes* - Since the infant is **symptomatic**, there is an immediate risk of irreversible **neurological damage**; therefore, treatment cannot be delayed for confirmation. - Immediate intervention with **IV dextrose** is mandatory for all symptomatic neonates regardless of the time since the last measurement, followed by a recheck. *Start oral feeds and observe* - Oral feeds are appropriate only for managing **asymptomatic, mild to moderate hypoglycemia** (e.g., in high-risk infants who screen positive but are clinically well). - Given the symptoms and blood glucose <35 mg/dL, relying on slow absorption from oral feeds is inadequate and exposes the infant to the risk of seizures and **brain injury**.

Q: A neonate was born to a controlled gestational diabetes mother. At the time of birth, he was fine but 4 days later, he developed dyspnea with SpO2 80% at room air. What is the initial management?

Give 100% O2. ***Give 100% O2***- The infant is suffering from **severe hypoxemia** (SpO2 80%), which is a life-threatening emergency requiring immediate stabilization.- The initial step in managing severe, unexplained neonatal hypoxemia or respiratory distress is to administer **100% oxygen** (maximal FiO2) to quickly improve SpO2 above critical levels (typically targeting >90-95%) while investigations or ventilation preparations are made.*Give 21% to 30% O2*- This concentration range represents minimal supplementation and is insufficient for treating **severe hypoxemia** (SpO2 80%) in a neonate.- Such low levels of supplemental oxygen are typically reserved for patients with very **mild desaturations** or during the process of weaning oxygen support.*Give 50% O2*- While this is a higher concentration than room air, 50% O2 may still be inadequate for the initial stabilization of an infant with **SpO2 80%**.- In severe, life-threatening hypoxemia, the priority is maximum oxygen concentration (100% O2) delivery to ensure rapid correction of tissue hypoxia.*Observation*- An oxygen saturation of 80% signifies acute **respiratory failure** or severe compromise and must be treated as a medical emergency, not simply observed.- **Observation** without immediate intervention inevitably leads to worsening hypoxemia, potential end-organ damage, and cardiorespiratory arrest.

Q: A neonate on examination has bilateral cataracts and, after investigations, is found to have a patent ductus arteriosus and salt and pepper retinopathy. What is the most likely congenital infection?

Rubella. ***Rubella***- The constellation of **bilateral cataracts**, **patent ductus arteriosus (PDA)**, and **salt and pepper retinopathy** is highly characteristic, if not pathognomonic, of **Congenital Rubella Syndrome (CRS)**.- Other common findings in CRS include **sensorineural hearing loss**, microcephaly, and **pulmonary artery stenosis**.*CMV*- Congenital Cytomegalovirus (CMV) infection is classically associated with **periventricular calcifications** on neuroimaging, microcephaly, and **sensorineural hearing loss**.- While CMV can cause chorioretinitis, it rarely causes the specific combination of **cataracts** and **PDA** found in this neonate, which strongly favors rubella.*Toxoplasma*- Congenital toxoplasmosis typically presents with the classic triad of **hydrocephalus**, **intracranial calcifications** (often random or diffuse), and focal **chorioretinitis**.- It is not typically associated with common cardiovascular defects like **PDA** or the specific appearance of **salt and pepper retinopathy**.*Varicella*- Congenital Varicella Syndrome is characterized by **skin scarring** (often a zigzag pattern), **limb hypoplasia**, and cortical atrophy.- Ocular findings usually involve **microphthalmia** and severe scarring rather than the specific combination of **cataracts** and **PDA**.

Q: When is a blood sample taken to diagnose neonatal hypothyroidism?

72 hours after delivery. ***72 hours after delivery*** - Newborn screening for congenital hypothyroidism is ideally performed **48-72 hours after birth** - This timing avoids false-positive results from the **physiological TSH surge** that occurs in the first 24-48 hours of life - At 72 hours, TSH levels have stabilized and accurately reflect thyroid function - Early detection allows prompt treatment to prevent neurodevelopmental impairment *Immediately from the umbilical cord* - Too early - will capture the physiological TSH surge immediately after birth - Results in high false-positive rate - Not recommended for screening *24 hours after delivery* - Still within the period of physiological TSH elevation - May yield false-positive results - Not optimal timing for screening *23-48 hours after delivery* - The lower end (24-48 hours) is acceptable in some screening programs - However, 48-72 hours is preferred to ensure TSH has normalized from the physiological surge - 72 hours provides more reliable results

Question 1

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 2

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 3

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 4

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 5

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

Question 6

Which of the following is considered harmful to a newborn baby in the immediate postnatal period?

Accepted Answer

Giving a bath immediately after birth

Answer

Placing the baby on the mother's chest

Answer

Cleaning the eyes with a wet sterile swab

Answer

Initiating breastfeeding within 1 hour

Question 7

A newborn, born to a diabetic mother, presents after 24 hours of life with a blood glucose level of <35 mg/dL. The baby is symptomatic. What is the next best step in management?

Accepted Answer

Administer IV glucose and recheck blood glucose after 20 minutes

Answer

Administer IV bolus of Hartmann solution

Answer

Start oral feeds and observe

Answer

Recheck blood glucose after 20 minutes

Question 8

A neonate was born to a controlled gestational diabetes mother. At the time of birth, he was fine but 4 days later, he developed dyspnea with SpO2 80% at room air. What is the initial management?

Accepted Answer

Give 100% O2

Answer

Observation

Answer

Give 50% O2

Answer

Give 21% to 30% O2

Question 9

A neonate on examination has bilateral cataracts and, after investigations, is found to have a patent ductus arteriosus and salt and pepper retinopathy. What is the most likely congenital infection?

Accepted Answer

Rubella

Answer

Varicella

Answer

CMV

Answer

Toxoplasma

Question 10

When is a blood sample taken to diagnose neonatal hypothyroidism?

Accepted Answer

72 hours after delivery

Answer

Immediately from the umbilical cord

Answer

23-48 hours after delivery

Answer

24 hours after delivery

Neonatology — MCQs

Neonatology — MCQs

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