Neonatology Practice Questions

Q: After premature delivery, mother's milk contains more amount of each of the following except:

Lactose. **Explanation:** The composition of breast milk is uniquely adapted to the gestational age of the infant. **Preterm milk** (milk produced by mothers who deliver before 37 weeks) differs significantly from **term milk** to meet the higher metabolic and growth demands of a premature baby. **Why Lactose is the correct answer:** Lactose levels are actually **lower** in preterm milk compared to term milk. This is a physiological adaptation because premature infants often have lower levels of intestinal lactase enzyme. A lower lactose content helps prevent osmotic diarrhea and excessive fermentation in the immature gut. As the lactation period progresses, lactose levels gradually increase. **Why the other options are incorrect:** * **Protein:** Preterm milk has significantly **higher** protein content (especially whey protein) to support rapid tissue growth and brain development in the neonate. * **Fat:** The lipid content is **higher** in preterm milk, providing the dense caloric intake required for weight gain. It also contains higher concentrations of long-chain polyunsaturated fatty acids (LC-PUFAs) like DHA for retinal and neural development. * **Sodium (and other electrolytes):** Preterm milk contains **higher** amounts of sodium, chloride, and magnesium. This compensates for the increased urinary loss of electrolytes due to the immature renal tubules of a premature infant. **High-Yield NEET-PG Pearls:** * **Preterm Milk vs. Term Milk:** Preterm milk is higher in Protein, Fat, Sodium, Chloride, IgA, and Lactoferrin, but **lower in Lactose, Calcium, and Phosphorus.** * **Caloric Density:** Preterm milk provides approximately 67-70 kcal/100ml. * **Fortification:** Despite the higher nutrient density, preterm milk still lacks sufficient Calcium and Phosphorus to prevent Metabolic Bone Disease of Prematurity, often requiring the addition of Human Milk Fortifiers (HMF).

Q: Neonatal alloimmune thrombocytopenia is caused by?

Maternal-fetal platelet antigen disparity. **Explanation:** **Neonatal Alloimmune Thrombocytopenia (NAIT)** is the platelet equivalent of Rh incompatibility. It occurs due to **maternal-fetal platelet antigen disparity**, most commonly involving the **Human Platelet Antigen 1a (HPA-1a)**. The underlying mechanism involves a mother who lacks a specific platelet antigen (usually HPA-1a negative) being exposed to fetal platelets carrying that antigen (inherited from the father). The mother develops IgG antibodies against these foreign antigens, which cross the placenta and cause sequestration and destruction of fetal platelets in the spleen. Unlike Rh disease, NAIT can occur during the **first pregnancy**. **Analysis of Incorrect Options:** * **A & C (B19 Parvovirus and CMV):** These are TORCH infections. While they can cause thrombocytopenia, it is usually due to bone marrow suppression or hypersplenism associated with systemic illness, not an alloimmune mechanism. * **D (Sepsis):** This is a common cause of neonatal thrombocytopenia due to increased platelet consumption (DIC) and marrow suppression, but it is an acquired, non-immune process. **High-Yield Clinical Pearls for NEET-PG:** * **Most common antigen:** HPA-1a (involved in >80% of cases). * **Clinical Presentation:** A healthy-appearing term neonate with isolated, severe thrombocytopenia and petechiae/purpura within hours of birth. * **Dreaded Complication:** Intracranial Hemorrhage (ICH) occurs in 10-20% of cases, often in utero. * **Treatment:** Transfusion of **washed maternal platelets** (since they lack the offending antigen) or HPA-matched platelets. IVIG is the first-line medical management for the neonate. * **Distinction:** In **Maternal ITP**, the mother has a low platelet count; in **NAIT**, the mother’s platelet count is always **normal**.

Q: A 2-day-old neonate presents with bilious vomiting and abdominal distension. The mother had polyhydramnios diagnosed antenatally. An abdominal X-ray shows a "double bubble" sign with no distal bowel gas. What is the most common anomaly associated with this presentation?

Trisomy 21. ***Trisomy 21*** - **Duodenal atresia** (indicated by the **double bubble sign** on X-ray) is associated with **Trisomy 21 (Down syndrome)** in approximately **30% of cases**, making it the most common chromosomal anomaly linked to this condition. - The combination of **bilious vomiting**, **abdominal distension**, and **polyhydramnios** strongly suggests duodenal atresia, which has a well-established association with **Down syndrome**. *Trisomy 13* - **Patau syndrome** is associated with severe **central nervous system defects**, **holoprosencephaly**, and **cardiac anomalies**, but not typically with duodenal atresia. - Neonates with Trisomy 13 usually present with **microcephaly**, **cleft lip/palate**, and severe developmental abnormalities rather than isolated gastrointestinal obstruction. *Trisomy 18* - **Edwards syndrome** is associated with **cardiac defects**, **growth retardation**, and **clenched fists**, but duodenal atresia is not a common feature. - Neonates typically present with **low birth weight**, **prominent occiput**, and **overlapping fingers** rather than isolated bowel obstruction. *Trisomy 18* - This is a duplicate option and represents **Edwards syndrome**, which is not commonly associated with **duodenal atresia**. - The clinical presentation would typically include **severe growth restriction**, **cardiac anomalies**, and distinctive **facial features** rather than isolated gastrointestinal obstruction.

Q: In a premature baby with convulsions presenting 2 days after birth, what is the first investigation to be performed?

Transcranial ultrasonography. **Explanation:** The correct answer is **Transcranial Ultrasonography (T-USG)**. **Why it is the correct answer:** In a **premature neonate**, the most common cause of convulsions occurring within the first 2–3 days of life is **Intraventricular Hemorrhage (IVH)**, originating from the fragile germinal matrix. T-USG is the investigation of choice because: 1. **Accessibility:** It can be performed bedside in the NICU without moving a critically ill, ventilated neonate. 2. **Anatomy:** The **anterior fontanelle** acts as an acoustic window, allowing excellent visualization of the periventricular area and ventricles. 3. **Safety:** It involves no ionizing radiation and does not require sedation. **Why other options are incorrect:** * **MRI:** While MRI is the most sensitive for identifying subtle brain injuries (like HIE or cortical dysgenesis), it is time-consuming, requires sedation, and necessitates transporting an unstable neonate out of the NICU. It is usually a secondary investigation. * **CT Scan:** CT involves high doses of ionizing radiation. It is generally reserved for suspected posterior fossa bleeds or acute trauma where USG is inconclusive. * **Skull Radiography:** X-rays only visualize bony structures and are useless for evaluating intracranial pathology like hemorrhage or edema. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** IVH typically occurs within the first 72 hours of life. * **Screening:** Routine T-USG screening is recommended for all neonates born **<32 weeks** gestation or **<1500g** (VLBW) at 7–10 days of life. * **Most common cause of neonatal seizures (Overall):** Perinatal Asphyxia (Hypoxic-Ischemic Encephalopathy), usually presenting within the first 24 hours. * **Drug of Choice:** Phenobarbital remains the first-line anticonvulsant for neonatal seizures.

Q: What is the most common abdominal tumor in a neonate?

Neuroblastoma. **Explanation:** In the neonatal period (first 28 days of life), the most common **malignant** abdominal tumor is **Neuroblastoma**. While multicystic dysplastic kidney and hydronephrosis are the most common causes of an abdominal *mass* overall, among true neoplasms, neuroblastoma takes precedence. It originates from the neural crest cells of the sympathetic nervous system, most commonly in the adrenal medulla. **Analysis of Options:** * **B. Neuroblastoma (Correct):** It is the most frequent malignancy in neonates. A unique feature in this age group is "Stage 4S," which often involves the liver, skin, and bone marrow, and has a remarkably high rate of spontaneous regression. * **A. Wilms Tumor:** While it is the most common renal tumor in children, it typically presents between **2 to 5 years** of age. It is extremely rare in the neonatal period (where Congenital Mesoblastic Nephroma is the more likely renal tumor). * **C. Hydronephrosis:** This is the most common cause of a palpable abdominal **mass** in a neonate, but it is a structural/obstructive abnormality, not a **tumor** (neoplasm). * **D. Bladder Tumor:** These are exceptionally rare in neonates. Rhabdomyosarcoma is the most common bladder malignancy in children, but it usually presents in toddlers or older children. **High-Yield Clinical Pearls for NEET-PG:** * **Most common neonatal abdominal mass:** Hydronephrosis (followed by Multicystic Dysplastic Kidney). * **Most common neonatal malignancy:** Neuroblastoma. * **Most common renal tumor in neonates:** Congenital Mesoblastic Nephroma (benign). * **Diagnostic Marker:** Elevated urinary catecholamines (VMA/HVA) are seen in 90% of neuroblastoma cases. * **Pepper Syndrome:** Massive hepatomegaly in neonatal neuroblastoma due to extensive liver metastasis.

Q: Ophthalmic examination to screen for retinopathy of prematurity is mandatory for newborns with birth weight less than?

1500 grams. ### Explanation **1. Why 1500 grams is correct:** Retinopathy of Prematurity (ROP) is a vasoproliferative disorder affecting the incomplete vascularization of the retina in preterm infants. According to the **National Neonatology Forum (NNF) of India** and international guidelines (like AAP), screening is mandatory for infants with a **birth weight ≤ 1500 grams** or a **gestational age ≤ 30 weeks**. These infants are at the highest risk because their retinal vessels have not reached the periphery (ora serrata), making them vulnerable to hypoxia-induced overproduction of VEGF (Vascular Endothelial Growth Factor) and subsequent abnormal neovascularization. **2. Why the other options are incorrect:** * **A (1000 grams):** While "Extremely Low Birth Weight" (ELBW) infants (<1000g) are at the highest risk for aggressive ROP, using this as the cutoff would miss a significant number of "Very Low Birth Weight" (VLBW) infants who also develop treatable disease. * **C & D (2000g & 2500g):** These weights are generally too high for routine screening. However, in developing countries like India, screening is extended to infants between **1500–2000g** only if they have an unstable clinical course (e.g., prolonged oxygen therapy, sepsis, or blood transfusions). 2500g is considered a normal birth weight. **3. Clinical Pearls for NEET-PG:** * **Timing of First Screen:** Usually at **4 weeks (30 days)** of life. For very preterm infants (<28 weeks), it is done at 2–3 weeks of life. * **"When to Screen" Rule:** "30-30 Rule" (≤30 weeks gestation or ≤1500g birth weight). * **Plus Disease:** Characterized by dilatation and tortuosity of posterior pole retinal vessels; it is a key indicator for treatment. * **Treatment of Choice:** Laser photocoagulation (diode laser) of the avascular retina. Intravitreal Anti-VEGF (Ranibizumab/Bevacizumab) is an emerging alternative.

Q: A neonate requires bag and mask ventilation during cardiopulmonary resuscitation. The heart rate is 60-100 beats per minute. What is the next recommended treatment?

Stop chest compressions and continue ventilation.. **Explanation:** The management of neonatal resuscitation follows the **NRP (Neonatal Resuscitation Program) algorithm**, which is strictly guided by the heart rate (HR). 1. **Why Option D is Correct:** In neonatal resuscitation, the primary goal is establishing effective ventilation. Chest compressions are indicated only when the HR remains **below 60 bpm** despite 30 seconds of effective positive pressure ventilation (PPV). If the HR rises to **60–100 bpm**, the criteria for chest compressions are no longer met. Therefore, compressions should be stopped to avoid unnecessary trauma and to focus on improving oxygenation, while PPV (ventilation) must continue until the HR exceeds 100 bpm and spontaneous respiration is established. 2. **Why Other Options are Incorrect:** * **Option A:** Adrenaline is only indicated if the HR remains **below 60 bpm** after at least 60 seconds of coordinated chest compressions and ventilation with 100% oxygen. * **Option B & C:** Chest compressions are contraindicated if the HR is above 60 bpm. Continuing them at a HR of 60–100 bpm is unnecessary and interferes with effective ventilation. **Clinical Pearls for NEET-PG:** * **Golden Minute:** The first 60 seconds of life are critical for completing the initial steps and starting PPV if needed. * **Compression-to-Ventilation Ratio:** In neonates, it is **3:1** (90 compressions and 30 breaths per minute). * **Target SpO2:** Do not expect 100% saturation immediately; at 1 minute, the target is only 60-65%. * **Depth of Compression:** One-third of the anteroposterior diameter of the chest. * **Preferred Technique:** The **two-thumb technique** is superior to the two-finger technique as it generates better perfusion pressure.

Q: What is the drug of choice for neonatal idiopathic thrombocytopenic purpura (ITP)?

Intravenous immunoglobulin (IVIG). **Explanation:** Neonatal Idiopathic Thrombocytopenic Purpura (ITP) usually occurs due to the transplacental passage of maternal anti-platelet IgG antibodies (passive immunization). **Why IVIG is the Correct Answer:** Intravenous Immunoglobulin (IVIG) is the **drug of choice** because it rapidly increases the platelet count by blocking the Fc receptors on splenic macrophages, preventing the destruction of antibody-coated platelets. In neonates, IVIG is preferred over steroids due to its faster onset of action and better safety profile, minimizing the risk of systemic side effects associated with corticosteroids in the neonatal period. **Analysis of Incorrect Options:** * **Platelet Transfusion (A):** This is generally **ineffective** because the circulating maternal antibodies will quickly destroy the transfused platelets. It is reserved only for life-threatening emergencies (e.g., intracranial hemorrhage). * **Prednisolone (B) & Dexamethasone (C):** While corticosteroids are first-line treatments for *adult* or *childhood* ITP, they are second-line in neonates. They take longer to act (48–72 hours) and carry risks of growth suppression and metabolic disturbances in newborns. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** Neonatal ITP occurs in infants born to mothers with active ITP or a history of ITP. * **Nadir:** Platelet counts usually reach their lowest point (nadir) between **day 2 and day 5** of life. * **Management Trigger:** Treatment is typically indicated if the platelet count drops below **20,000–30,000/µL** or if there is active bleeding. * **Prognosis:** The condition is self-limiting and resolves within 1–2 months as maternal antibodies are cleared from the infant's circulation.

Question 1

After premature delivery, mother's milk contains more amount of each of the following except:

Accepted Answer

Lactose

Answer

Fat

Answer

Protein

Answer

Sodium

Question 2

Neonatal alloimmune thrombocytopenia is caused by?

Accepted Answer

Maternal-fetal platelet antigen disparity

Answer

B19 parvovirus infection

Answer

Cytomegalovirus infection

Answer

Sepsis

Question 3

A 2-day-old neonate presents with bilious vomiting and abdominal distension. The mother had polyhydramnios diagnosed antenatally. An abdominal X-ray shows a "double bubble" sign with no distal bowel gas. What is the most common anomaly associated with this presentation?

Accepted Answer

Trisomy 21

Answer

Trisomy 13

Answer

Trisomy 18

Answer

Trisomy 16

Question 4

In a premature baby with convulsions presenting 2 days after birth, what is the first investigation to be performed?

Accepted Answer

Transcranial ultrasonography

Answer

Magnetic resonance imaging (MRI)

Answer

Skull radiography

Answer

Computed tomography (CT) scan of the skull

Question 5

What is the most common abdominal tumor in a neonate?

Accepted Answer

Neuroblastoma

Answer

Wilms tumor

Answer

Hydronephrosis

Answer

Bladder tumor

Question 6

Ophthalmic examination to screen for retinopathy of prematurity is mandatory for newborns with birth weight less than?

Accepted Answer

1500 grams

Answer

1000 grams

Answer

2000 grams

Answer

2500 grams

Question 7

A woman who developed chickenpox 2 days ago is admitted in labor. What is the best method to prevent infection in the neonate?

Accepted Answer

Administer varicella zoster immunoglobulin (VZIG) to the neonate soon after birth

Answer

Administer varicella zoster vaccine to the neonate

Answer

Perform a cesarean section immediately

Answer

Prevent breastfeeding

Question 8

A neonate requires bag and mask ventilation during cardiopulmonary resuscitation. The heart rate is 60-100 beats per minute. What is the next recommended treatment?

Accepted Answer

Stop chest compressions and continue ventilation.

Answer

Continue ventilation and start adrenaline.

Answer

Continue ventilation and start chest compressions.

Answer

Continue chest compressions and ventilation.

Question 9

What is the drug of choice for neonatal idiopathic thrombocytopenic purpura (ITP)?

Accepted Answer

Intravenous immunoglobulin (IVIG)

Answer

Platelet transfusion

Answer

Prednisolone

Answer

Dexamethasone

Question 10

Donor breast milk is known to transmit which of the following infections?

Accepted Answer

Rubella

Answer

Tuberculosis

Answer

CMV

Answer

HIV

Neonatology — MCQs

Neonatology — MCQs

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