Neonatology — MCQs

A two-day-old baby presented with severe respiratory distress. On examination, a scaphoid abdomen and decreased breath sounds on the left side were observed. The baby was managed by prompt endotracheal intubation. After ET tube placement, the maximal cardiac impulse shifted further to the right side. What should be the next step in management?

Q286Medium

Which of the following is used to monitor respiration in a neonate who is not intubated?

Q287Medium

Which of the following statements about Intrauterine Growth Restriction (IUGR) is true?

Q288Medium

Which of the following statements is true regarding the resuscitation of a neonate born through meconium-stained amniotic fluid?

Q289Medium

A newborn is infected in utero with an enveloped virus containing double-stranded DNA. The child develops petechiae, hepatosplenomegaly, and jaundice. Brain calcifications are detected on computed tomography (CT). With which of the following viruses is the newborn most likely infected?

Q290Medium

A 3-month-old infant presents with profuse lacrimation. Pus exudes from the puncta upon pressure. What is the best line of management?

Neonatology Indian Medical PG Practice Questions and MCQs

Question 281: Extremely low birth weight is defined as birth weight below:

A. 1000 gm (Correct Answer)
B. 1200 gm
C. 1500 gm
D. 2500 gm

Explanation: **Explanation:** The classification of birth weight is a fundamental concept in neonatology, used to predict neonatal morbidity and mortality. The correct answer is **1000 gm** based on the standard World Health Organization (WHO) and American Academy of Pediatrics (AAP) definitions. **1. Why Option A is Correct:** * **Extremely Low Birth Weight (ELBW):** Defined as a birth weight **less than 1000 grams**. These infants are at the highest risk for complications such as Respiratory Distress Syndrome (RDS), Intraventricular Hemorrhage (IVH), and Necrotizing Enterocolitis (NEC). **2. Why Other Options are Incorrect:** * **Option B (1200 gm):** This is an arbitrary number and does not correspond to a standard clinical classification. * **Option C (1500 gm):** This defines **Very Low Birth Weight (VLBW)**. VLBW infants are those weighing less than 1500 grams. * **Option D (2500 gm):** This defines **Low Birth Weight (LBW)**. Any infant weighing less than 2500 grams at birth, regardless of gestational age, falls into this category. **High-Yield Clinical Pearls for NEET-PG:** * **Micropremie:** Often used clinically for infants weighing less than **750 gm** or born before 26 weeks. * **Incredible Low Birth Weight (ILBW):** A newer, less common term sometimes used for infants **< 750 gm**. * **Normal Birth Weight:** 2500 gm to 3999 gm. * **Macrosomia:** Birth weight **≥ 4000 gm** (often associated with maternal diabetes). * **Small for Gestational Age (SGA):** Weight below the 10th percentile for a specific gestational age (distinct from LBW, which is based on absolute weight).

Question 282: Regarding Cephalohematoma, all the following are true EXCEPT?

A. It is a subperiosteal hemorrhage.
B. It may extend across the midline and cross suture lines. (Correct Answer)
C. It occurs in 1-2% of live births.
D. An underlying skull fracture may be associated in 10-25% of cases.

Explanation: ### Explanation **Concept Overview:** Cephalohematoma is a collection of blood between the skull bone and its overlying periosteum. The key to answering this question lies in the anatomical boundaries of the periosteum. **1. Why Option B is the Correct Answer (The "Except" statement):** In a cephalohematoma, the hemorrhage is **subperiosteal**. Because the periosteum is firmly attached to the edges of the individual cranial bones at the **sutures**, the bleeding is strictly confined to the surface of that specific bone. Therefore, a cephalohematoma **never crosses suture lines**. This distinguishes it clinically from *Caput Succedaneum* (which is subcutaneous edema) and *Subgaleal Hemorrhage* (which is between the periosteum and the aponeurosis). **2. Analysis of Other Options:** * **Option A:** True. By definition, it is a subperiosteal bleed, usually involving the parietal or occipital bones. * **Option C:** True. It is a common birth injury occurring in approximately 1–2% of live births, often associated with vacuum or forceps-assisted deliveries. * **Option D:** True. While most cases are benign, an underlying linear skull fracture is present in about 10–25% of cases. **Clinical Pearls for NEET-PG:** * **Timing:** Unlike Caput (present at birth), cephalohematoma often appears **hours to days after birth** as the bleeding is slow. * **Resolution:** It takes weeks to months to resolve and may undergo **peripheral calcification**, giving it a "hard" feel. * **Complications:** Watch for **unconjugated hyperbilirubinemia** (as the blood breaks down) and anemia. * **Management:** Observation only. **Incision and drainage are contraindicated** due to the high risk of introducing infection (osteomyelitis).

Question 283: Which of the following is a characteristic feature of hemorrhagic disease of the newborn?

A. Prolonged prothrombin time (Correct Answer)
B. Defective platelet count
C. Prolonged bleeding time
D. Prolonged thrombin time

Explanation: **Explanation:** **Hemorrhagic Disease of the Newborn (HDN)**, now more commonly referred to as **Vitamin K Deficiency Bleeding (VKDB)**, occurs because neonates have low stores of Vitamin K at birth. Vitamin K is essential for the post-translational carboxylation of **Factors II, VII, IX, and X**. **Why Option A is Correct:** Vitamin K deficiency primarily affects the **extrinsic and common pathways** of the coagulation cascade. **Factor VII** has the shortest half-life among the vitamin K-dependent factors; therefore, its deficiency occurs early and rapidly leads to a **prolonged Prothrombin Time (PT)**. While Activated Partial Thromboplastin Time (aPTT) is also prolonged, PT is the most sensitive screening test for this condition. **Why Other Options are Incorrect:** * **B & C (Platelet count and Bleeding Time):** HDN is a secondary hemostasis defect (clotting factor deficiency). Primary hemostasis, which involves platelets and blood vessel interaction, remains intact. Therefore, platelet count and bleeding time are **normal**. * **D (Thrombin Time):** Thrombin time measures the conversion of fibrinogen to fibrin. This process is not dependent on Vitamin K; hence, it remains **normal** in HDN. **High-Yield Clinical Pearls for NEET-PG:** * **Prophylaxis:** All newborns should receive **1 mg of Vitamin K intramuscularly** at birth to prevent VKDB. * **Classification:** * *Early:* Within 24 hours (usually due to maternal drugs like anticonvulsants). * *Classic:* 2–7 days (due to poor feeding/low breast milk intake). * *Late:* 2 weeks to 6 months (often associated with exclusive breastfeeding or malabsorption). * **Breast Milk vs. Cow Milk:** Breast milk is notoriously low in Vitamin K (approx. 1–2 μg/L) compared to cow’s milk (approx. 5–10 μg/L).

Question 284: A baby is born to an HBsAg positive mother. Which of the following is required for the prevention of mother-to-child transmission of Hepatitis B?

A. Hepatitis B immunoglobulin (HBIG) with the first dose of Hepatitis B vaccine at birth, followed by routine Hepatitis B vaccination. (Correct Answer)
B. Hepatitis B vaccine at 0, 1, and 6 months.
C. Hepatitis B immunoglobulin (HBIG) and lamivudine prophylaxis.
D. Hepatitis B vaccine and lamivudine prophylaxis.

Explanation: **Explanation:** The primary goal in managing a neonate born to an **HBsAg-positive mother** is to provide both **immediate passive immunity** and **long-term active immunity** to prevent vertical transmission, which carries a high risk of chronic carrier status (up to 90%). 1. **Why Option A is correct:** The standard of care is the administration of **Hepatitis B Immunoglobulin (HBIG)** and the **Hepatitis B vaccine** at separate anatomical sites within **12 hours of birth**. HBIG provides immediate post-exposure prophylaxis (passive), while the vaccine initiates the production of endogenous antibodies (active). This combination is >90% effective in preventing transmission. 2. **Why other options are incorrect:** * **Option B:** While this is the standard schedule for low-risk infants, it lacks HBIG. In HBsAg-positive mothers, the vaccine alone is less effective than the combination therapy. * **Options C & D:** Lamivudine or Tenofovir are antiviral medications sometimes given to the *mother* during the third trimester if her viral load is very high (>200,000 IU/mL). They are not the standard prophylactic treatment for the *neonate* at birth. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** HBIG and the first vaccine dose must be given within **12 hours** (maximum up to 7 days, but efficacy decreases). * **Site:** Always use separate syringes and separate sites (e.g., left vs. right anterolateral thigh). * **Preterm Infants (<2kg):** The birth dose does **not** count toward the 3-dose primary series due to potentially poor immune response. They require a total of 4 doses (0, 1, 2, and 6 months). * **Post-vaccination Testing:** Test the infant for HBsAg and Anti-HBs at **9–15 months** of age to confirm successful prophylaxis.

Question 285: A two-day-old baby presented with severe respiratory distress. On examination, a scaphoid abdomen and decreased breath sounds on the left side were observed. The baby was managed by prompt endotracheal intubation. After ET tube placement, the maximal cardiac impulse shifted further to the right side. What should be the next step in management?

A. Confirm the position of the endotracheal tube by chest X-ray
B. Remove the tube and reattempt intubation (Correct Answer)
C. Nasogastric tube insertion and decompress the bowel
D. Chest X-ray to confirm diagnosis

Explanation: ### Explanation **Diagnosis:** The clinical presentation of severe respiratory distress, a **scaphoid abdomen**, and decreased breath sounds on the left side in a neonate is a classic triad for **Congenital Diaphragmatic Hernia (CDH)**. **Why Option B is Correct:** In CDH, the heart is already displaced to the right (dextroposition) due to the presence of abdominal viscera in the left thoracic cavity. The question states that after intubation, the maximal cardiac impulse shifted **further to the right**. This indicates **accidental right mainstem bronchus intubation**. In a neonate with left-sided CDH, intubating the right bronchus is catastrophic because it causes hyperinflation of the only functional lung (the right lung) and complete collapse of the left side, leading to a tension effect that shifts the mediastinum even further. The immediate corrective action is to withdraw/reposition the tube to ensure bilateral ventilation (or at least ventilation of the non-herniated lung). **Why Other Options are Incorrect:** * **Option A & D:** While a chest X-ray is the gold standard for confirming tube position and diagnosis, it should not delay management in a clinically deteriorating neonate with signs of malpositioned ET tube. * **Option C:** Nasogastric (NG) tube insertion is a vital step in CDH management to decompress the bowel and prevent further lung compression; however, it is not the *immediate* next step when an airway malposition is causing acute mediastinal shift. **Clinical Pearls for NEET-PG:** * **CDH Management Rule:** **Avoid Bag-and-Mask Ventilation (BMV)** as it distends the intrathoracic bowel, further compressing the lungs. Immediate **Endotracheal Intubation** is the preferred airway management. * **Most Common Site:** Left-sided (Bochdalek hernia) is most common (85%). * **Key Sign:** Scaphoid abdomen (sunken appearance because abdominal contents are in the chest). * **Prognostic Factor:** The degree of pulmonary hypoplasia and pulmonary hypertension determines survival.

Question 286: Which of the following is used to monitor respiration in a neonate who is not intubated?

A. Capnography
B. Impedance pneumography (Correct Answer)
C. Chest movements
D. Infrared End Tidal CO2

Explanation: ### Explanation **1. Why Impedance Pneumography is Correct:** Impedance pneumography is the standard technology used in bedside neonatal monitors to track respiration in non-intubated infants. It works by passing a high-frequency, low-amplitude electrical current between two ECG electrodes placed on the chest. As the neonate breathes, the volume of air in the lungs changes, altering the **transthoracic electrical impedance**. The monitor detects these cyclical changes in resistance and converts them into a respiratory rate and waveform. **2. Analysis of Incorrect Options:** * **Capnography & Infrared End-Tidal CO2 (Options A & D):** These methods measure the concentration of CO2 in exhaled air. While highly accurate, they typically require an interface with an endotracheal tube (intubated patients) or a specialized nasal cannula. In non-intubated neonates, "blow-by" oxygen or small tidal volumes make these methods technically difficult and less reliable for routine continuous monitoring compared to impedance. * **Chest Movements (Option C):** Visual observation of chest wall excursions is a clinical assessment tool, not a continuous automated monitoring technology. It is prone to human error and cannot provide an automated alarm system for apnea. **3. Clinical Pearls for NEET-PG:** * **Limitation of Impedance Pneumography:** It cannot distinguish between **obstructive apnea** and normal breathing. In obstructive apnea, the chest wall still moves (changing impedance), so the monitor may falsely show a normal respiratory rate despite the absence of airflow. * **Gold Standard for Apnea:** Polysomnography (which includes thermistors to detect airflow) is the gold standard for diagnosing types of apnea. * **Electrode Placement:** For optimal impedance monitoring in neonates, electrodes should be placed in the mid-axillary line at the level of the nipples.

Question 287: Which of the following statements about Intrauterine Growth Restriction (IUGR) is true?

A. Hepatomegaly in IUGR is due to fatty infiltration.
B. The head circumference is typically 3 cm greater than the chest circumference in IUGR. (Correct Answer)
C. Hyaline membrane disease is a common cause of death in IUGR.
D. Hypothermia does not occur in IUGR due to effective shivering mechanisms.

Explanation: **Explanation:** **1. Why Option B is Correct:** In Intrauterine Growth Restriction (IUGR), particularly the **asymmetrical type** (the most common form), there is a phenomenon known as **"Brain Sparing."** The fetus redistributes blood flow to vital organs like the brain and heart at the expense of the liver, muscles, and subcutaneous fat. Consequently, the head growth is relatively preserved while the body remains thin. In a normal neonate, the head circumference (HC) is typically 2 cm greater than the chest circumference (CC). In IUGR, this disparity increases, and the **HC is often ≥3 cm greater than the CC**, serving as a clinical marker of growth restriction. **2. Why the Other Options are Incorrect:** * **Option A:** Hepatomegaly is not a feature of IUGR. In fact, the **liver is small** due to depleted glycogen stores and reduced fat, contributing to the thin abdomen and increased HC:CC ratio. * **Option C:** Hyaline Membrane Disease (HMD) is primarily a disease of prematurity. In IUGR, the chronic intrauterine stress often leads to **accelerated lung maturity** due to increased endogenous corticosteroid production. The more common respiratory complication in IUGR is Meconium Aspiration Syndrome (MAS). * **Option D:** IUGR infants are at **high risk for hypothermia** due to a high surface-area-to-volume ratio, lack of insulating subcutaneous fat, and depleted brown fat stores. Neonates, in general, cannot shiver effectively; they rely on non-shivering thermogenesis. **High-Yield Clinical Pearls for NEET-PG:** * **Ponderal Index:** Used to identify asymmetrical IUGR ($Weight/Length^3 \times 100$). It is low in asymmetrical IUGR. * **Common Complications:** Hypoglycemia (low glycogen), Hypocalcemia, Polycythemia (due to chronic hypoxia), and Hyperbilirubinemia. * **Asymmetrical vs. Symmetrical:** Asymmetrical (Late onset, placental insufficiency) is more common than Symmetrical (Early onset, chromosomal/infections).

Question 288: Which of the following statements is true regarding the resuscitation of a neonate born through meconium-stained amniotic fluid?

A. Intrapartum suctioning of the mouth and nose may be performed.
B. Postnatal tracheal suctioning should be performed for all non-vigorous neonates.
C. At least one person skilled in endotracheal intubation should be available during resuscitation. (Correct Answer)
D. All neonates born through meconium-stained amniotic fluid should be admitted to the neonatal intensive care unit for at least 6 hours before being discharged to the mother.

Explanation: ### Explanation The management of neonates born through **Meconium-Stained Amniotic Fluid (MSAF)** has evolved significantly based on the Neonatal Resuscitation Program (NRP) guidelines. **1. Why Option C is Correct:** While routine intubation is no longer recommended for all non-vigorous infants, MSAF remains a significant risk factor for respiratory distress and Meconium Aspiration Syndrome (MAS). Therefore, the NRP guidelines mandate that at every delivery where meconium is present, at least one person skilled in **endotracheal intubation** and advanced resuscitation must be available to manage potential airway obstruction or respiratory failure. **2. Why the Other Options are Incorrect:** * **Option A:** Intrapartum suctioning (suctioning on the perineum after the head is delivered but before the shoulders) is **no longer recommended**. Large trials have shown it does not prevent MAS and may cause reflex bradycardia. * **Option B:** Current guidelines (NRP 7th/8th Edition) state that **routine tracheal suctioning** is not recommended even for non-vigorous infants. Instead, the focus should be on starting Positive Pressure Ventilation (PPV) if the baby is not breathing or has a heart rate <100 bpm. Tracheal suctioning is now reserved only if the airway is obstructed during PPV. * **Option D:** Not all MSAF babies require NICU admission. If the baby is vigorous and stable, they can stay with the mother for routine care and observation. **Clinical Pearls for NEET-PG:** * **Vigorous infant definition:** Strong respiratory effort, good muscle tone, and heart rate >100 bpm. * **Management of Non-vigorous MSAF:** Move to the radiant warmer, perform initial steps (dry, stimulate), and initiate **PPV** if the heart rate is <100 bpm or the infant is apneic. * **MAS Complication:** The most dreaded complication of MSAF is **Persistent Pulmonary Hypertension of the Newborn (PPHN)**.

Question 289: A newborn is infected in utero with an enveloped virus containing double-stranded DNA. The child develops petechiae, hepatosplenomegaly, and jaundice. Brain calcifications are detected on computed tomography (CT). With which of the following viruses is the newborn most likely infected?

A. Cytomegalovirus (Correct Answer)
B. Hepatitis B
C. Hepatitis C
D. Hepatitis D

Explanation: **Explanation:** The clinical presentation of petechiae (blueberry muffin rash), hepatosplenomegaly, jaundice, and intracranial calcifications in a neonate is classic for a **Congenital TORCH infection**. **1. Why Cytomegalovirus (CMV) is correct:** CMV is the most common intrauterine infection. It is an **enveloped, double-stranded DNA virus** (a member of the Herpesviridae family). The hallmark finding on CT is **periventricular calcifications** (calcifications lining the ventricles). This distinguishes it from Toxoplasmosis, which typically presents with diffuse cortical calcifications. Other features like microcephaly, sensorineural hearing loss (the most common long-term sequela), and chorioretinitis are also frequently seen. **2. Why the other options are incorrect:** * **Hepatitis B (HBV):** While it is an enveloped DNA virus, neonatal infection usually occurs during delivery (perinatally) rather than in utero. It typically results in a chronic carrier state rather than acute congenital malformations or intracranial calcifications. * **Hepatitis C (HCV) & Hepatitis D (HDV):** These are **RNA viruses** (HCV is Flavivirus; HDV is a defective Deltavirus). They do not cause the classic TORCH constellation of petechiae and brain calcifications. **Clinical Pearls for NEET-PG:** * **CMV:** Periventricular calcifications + Sensorineural hearing loss (SNHL). * **Toxoplasmosis:** Diffuse calcifications + Hydrocephalus + Chorioretinitis. * **Congenital Rubella:** PDA + Cataracts + SNHL (Blueberry muffin rash). * **Diagnosis:** Urine or saliva PCR within the first 3 weeks of life is the gold standard for congenital CMV. * **Treatment:** Intravenous Ganciclovir or oral Valganciclovir is used to reduce the severity of hearing loss and developmental delays.

Question 290: A 3-month-old infant presents with profuse lacrimation. Pus exudes from the puncta upon pressure. What is the best line of management?

A. Dacryocystorhinostomy
B. Syringing
C. Massaging of the lacrimal sac with antibiotics
D. Syringing and probing (Correct Answer)

Explanation: **Explanation:** The clinical presentation of profuse lacrimation (epiphora) and purulent discharge upon pressure over the lacrimal sac in a 3-month-old infant is diagnostic of **Congenital Nasolacrimal Duct Obstruction (CNLDO)** with secondary dacryocystitis. **1. Why "Syringing and Probing" is the correct answer:** While conservative management (Crigler’s massage) is the initial step for simple CNLDO, the presence of **pus exuding from the puncta** indicates a significant blockage and secondary infection. In clinical practice and standard textbooks (like Ghai Pediatrics), if conservative management fails or if there is persistent infection/mucopyocele, **probing** is the definitive intervention. It involves passing a Bowman’s probe to rupture the persistent membrane (usually the Valve of Hasner) at the lower end of the NLD. **2. Analysis of Incorrect Options:** * **A. Dacryocystorhinostomy (DCR):** This is a major surgical procedure reserved for adults or older children (usually >4 years) where probing and intubation have failed. It is never the first-line treatment in an infant. * **B. Syringing:** Syringing alone is diagnostic to check patency but is rarely therapeutic for a complete membranous obstruction. It is usually performed in conjunction with probing. * **C. Massaging with antibiotics:** This is the initial treatment for simple watering. However, once there is frank pus (dacryocystitis), the success rate of massage decreases, and more definitive intervention like probing is prioritized to drain the infection and establish patency. **NEET-PG High-Yield Pearls:** * **Most common site of obstruction:** Valve of Hasner (distal end of NLD). * **Crigler’s Massage:** Hydrostatic pressure technique; recommended 10 times, 4 times a day. * **Success Rate:** 90% of CNLDO cases resolve spontaneously by 1 year of age. * **Ideal time for Probing:** Usually performed between 9–12 months if massage fails, but can be done earlier if there is persistent suppuration.

Practice by Chapter

Neonatal Resuscitation

Practice Questions

Care of the Normal Newborn

Practice Questions

Prematurity and Low Birth Weight

Practice Questions

Respiratory Distress Syndrome

Practice Questions

Neonatal Jaundice

Practice Questions

Neonatal Sepsis

Practice Questions

Necrotizing Enterocolitis

Practice Questions

Intraventricular Hemorrhage

Practice Questions

Persistent Pulmonary Hypertension

Practice Questions

Perinatal Asphyxia

Practice Questions

Neonatal Seizures

Practice Questions

Congenital Anomalies

Practice Questions

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