Neonatology Practice Questions

Q: Which of the following conditions is most likely to lead to transient tachypnea of the newborn?

A term infant delivered via cesarean section.. **Explanation:** **Transient Tachypnea of the Newborn (TTN)**, also known as "Wet Lung Disease," is caused by the **delayed clearance of fetal lung fluid** after birth. **1. Why Option C is Correct:** During a spontaneous vaginal delivery, the mechanical "thoracic squeeze" as the fetus passes through the birth canal helps expel approximately one-third of the lung fluid. Additionally, the hormonal surge (catecholamines and steroids) during labor triggers the activation of epithelial sodium channels (ENaC), which shifts the lung from fluid secretion to active absorption. In a **Cesarean Section**, especially one performed without prior labor, both the mechanical squeeze and the hormonal triggers are absent, leading to retained fluid in the alveolar spaces and subsequent respiratory distress. **2. Why Options A and B are Incorrect:** * **Option A & B:** Both spontaneous and forceps-assisted vaginal deliveries involve the passage of the fetus through the birth canal. This provides the necessary mechanical compression and is associated with the physiological stress of labor that promotes fluid resorption. Therefore, these infants are at a significantly lower risk for TTN compared to those delivered via C-section. **3. NEET-PG High-Yield Pearls:** * **Clinical Presentation:** Typically seen in term or near-term infants; presents with tachypnea (RR >60) shortly after birth, usually resolving within 24–72 hours. * **Chest X-ray Findings:** Characterized by **prominent perihilar vascular markings** (sunburst appearance), fluid in the interlobar fissures, and occasionally mild cardiomegaly or pleural effusion. * **Management:** Primarily supportive (oxygen via hood or CPAP); it is a self-limiting condition. * **Risk Factors:** Elective C-section, maternal asthma, maternal diabetes, and precipitous labor.

Q: Intrauterine growth restriction (IUGR) is commonly associated with which of the following infections?

All of the above. **Explanation:** Intrauterine growth restriction (IUGR) is a common manifestation of **TORCH infections** (Toxoplasmosis, Other [Syphilis, Varicella, Parvovirus B19], Rubella, Cytomegalovirus, and Herpes Simplex). These pathogens cross the placenta and interfere with fetal organogenesis and cellular proliferation, leading to symmetrical growth restriction. * **Rubella (Congenital Rubella Syndrome):** Rubella virus causes chronic mitotic inhibition and vascular endothelial damage. This results in a significant reduction in the total number of fetal cells, leading to severe IUGR, microcephaly, cataracts, and "blueberry muffin" spots. * **Syphilis:** *Treponema pallidum* causes chronic placental inflammation (villitis) and endarteritis. This impairs nutrient transfer and fetal perfusion, frequently resulting in IUGR, hepatosplenomegaly, and skeletal abnormalities (e.g., Wimberger sign). * **Cytomegalovirus (CMV):** As the most common congenital infection, CMV causes direct cytopathic effects on fetal tissues. It is a classic cause of symmetrical IUGR, often accompanied by periventricular calcifications and sensorineural hearing loss. **Clinical Pearls for NEET-PG:** * **Most common cause of IUGR worldwide:** Placental insufficiency (maternal factors). * **Most common infectious cause of IUGR:** Cytomegalovirus (CMV). * **Symmetrical vs. Asymmetrical:** Infections typically cause **Symmetrical IUGR** (early insult affecting both head and body), whereas placental insufficiency usually causes **Asymmetrical IUGR** (late insult with "head-sparing" effect). * **Diagnostic Clue:** If a neonate presents with IUGR and microcephaly, always screen for TORCH titers and perform a cranial ultrasound.

Q: What is the normal respiratory rate in a newborn?

40-60 breaths/minute. **Explanation:** The normal respiratory rate for a healthy term newborn is **40 to 60 breaths per minute**. This higher rate compared to adults is physiological, reflecting the newborn's high metabolic demand and smaller lung compliance. A key characteristic of neonatal respiration is **periodic breathing**, where short pauses (less than 5-10 seconds) occur, followed by rapid breathing; therefore, the rate must be counted for a full minute for accuracy. **Analysis of Options:** * **A (10-20 bpm):** This is the normal respiratory range for **adults**. In a newborn, this would signify severe respiratory depression or apnea. * **B (30-40 bpm):** While this may be seen in older infants, it is considered **bradypnea** in a newborn, potentially indicating maternal sedation or neurological depression. * **D (60-80 bpm):** This range indicates **tachypnea**. Persistent rates >60 bpm are a hallmark of respiratory distress syndrome (RDS), transient tachypnea of the newborn (TTN), or neonatal sepsis. **Clinical Pearls for NEET-PG:** 1. **Tachypnea:** Defined as a respiratory rate **>60 breaths/min**. It is the earliest sign of respiratory distress in a neonate. 2. **Silverman-Anderson Score:** Used to assess the severity of respiratory distress in preterm infants (includes grunting, retractions, and nasal flaring). 3. **Apnea of Prematurity:** Defined as cessation of breathing for **>20 seconds**, or shorter if accompanied by bradycardia or cyanosis. 4. **Initial Breath:** The first breath of a newborn requires high negative intrathoracic pressure (approx. -40 to -70 cm H₂O) to expand the fluid-filled alveoli.

Q: Which of the following infections can be transmitted through breast milk?

Cytomegalovirus (CMV). **Explanation:** **Why Cytomegalovirus (CMV) is correct:** Cytomegalovirus is one of the few viruses known to be actively excreted in breast milk. In term infants, transmission via breast milk is common but usually asymptomatic due to the passive transfer of maternal antibodies. However, in **very low birth weight (VLBW) or preterm infants**, acquired CMV through breast milk can lead to a "sepsis-like syndrome," characterized by hepatosplenomegaly, thrombocytopenia, and neutropenia. For this reason, breast milk for preterm babies is often pasteurized or frozen to reduce the viral load. **Why the other options are incorrect:** * **Tuberculosis (A):** TB is not transmitted through breast milk. The primary risk to the neonate is **respiratory droplet** transmission from an infected mother. Breastfeeding is encouraged once the mother is non-infectious, provided the infant receives isoniazid prophylaxis. * **Varicella (C):** Transmission occurs via **respiratory droplets or direct contact** with lesions. If a mother develops varicella 5 days before to 2 days after delivery, the infant requires VZIG, but the milk itself does not carry the virus. * **Rubella (D):** While Rubella virus can occasionally be found in milk, it does not cause disease in the infant via this route. The clinical concern for Rubella is strictly **transplacental** (Congenital Rubella Syndrome). **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindications to Breastfeeding:** HIV (in developed countries), HTLV-1/2, active untreated Galactosemia in the infant, and maternal use of radioactive isotopes or antimetabolites. * **Temporary Contraindications:** Active Herpes simplex lesions on the breast (can feed from the other breast) and untreated Sputum-positive TB (resume after 2 weeks of ATT). * **Hepatitis B:** Breastfeeding is **not** contraindicated if the infant receives the HBV vaccine and HBIG at birth.

Q: Which drug is used in neonatal resuscitation?

All of the above. **Explanation:** Neonatal resuscitation follows a structured algorithm (NRP) where drugs are indicated if the heart rate remains below 60 bpm despite adequate ventilation and chest compressions. 1. **Adrenaline (Epinephrine):** This is the **primary drug** used in neonatal resuscitation. It acts as a potent vasoconstrictor (alpha-adrenergic effect) to increase coronary perfusion pressure and a cardiac stimulant (beta-adrenergic effect) to improve heart rate and contractility. The recommended IV/IO dose is 0.01 to 0.03 mg/kg (1:10,000 concentration). 2. **Sodium Bicarbonate:** While no longer used routinely, it is indicated in cases of **prolonged cardiac arrest** unresponsive to other measures or documented metabolic acidosis. It helps neutralize the acidotic environment that impairs myocardial function. 3. **Naloxone:** This is an opioid antagonist used to reverse **respiratory depression** in a neonate born to a mother who received opioids within 4 hours of delivery. Note: It is only given *after* the airway is stabilized and is contraindicated if the mother is a chronic opioid addict (to avoid withdrawal). **High-Yield Clinical Pearls for NEET-PG:** * **Route of Choice:** Intravenous (IV) or Intraosseous (IO) is preferred. Endotracheal adrenaline is a temporary measure but requires a higher dose (0.05 to 0.1 mg/kg). * **Volume Expanders:** Normal Saline (0.9% NaCl) or O-negative blood (10 ml/kg) are used if there is evidence of hypovolemia or blood loss. * **Atropine:** It is **not** recommended in the standard neonatal resuscitation algorithm. * **Target SpO2:** Remember that pre-ductal SpO2 (right hand) takes up to 10 minutes to reach >90%.

Q: About caput succedaneum, all are true EXCEPT:

It can predispose to prolonged jaundice. ### Explanation **Caput Succedaneum** is a common neonatal scalp condition characterized by edema of the subcutaneous tissue above the periosteum. **Why Option B is the Correct Answer (The "Except"):** Unlike a **Cephalohematoma**, which involves a collection of blood between the periosteum and the skull bone, Caput Succedaneum consists primarily of **serosanguinous fluid and edema**. Because there is no significant breakdown of red blood cells (hemolysis) or large-scale reabsorption of blood, it **does not** typically predispose the neonate to hyperbilirubinemia or prolonged jaundice. In contrast, Cephalohematoma is a well-known risk factor for jaundice. **Analysis of Other Options:** * **Option A:** Caput is clinically described as a **soft, boggy swelling** that is present at birth. It is diffuse and, crucially, **crosses the suture lines**. * **Option C:** Since it is simple edema, it resolves rapidly, usually within **48 to 72 hours** of life, without any specific treatment. * **Option D:** It is caused by pressure on the fetal head during labor. **Vacuum-assisted delivery (Ventouse)** is a major cause, often resulting in a specific type of caput known as a "chignon." **High-Yield Clinical Pearls for NEET-PG:** * **Caput Succedaneum:** Present at birth, crosses sutures, resolves in days, no risk of jaundice. * **Cephalohematoma:** Appears hours after birth, **does not cross sutures** (subperiosteal), takes weeks to resolve, **increases risk of jaundice**. * **Subgaleal Hemorrhage:** Bleeding between the aponeurosis and periosteum; it is a surgical emergency as it can lead to massive blood loss and hypovolemic shock.

Q: Which of the following is NOT a feature of neonatal necrotizing enterocolitis?

Increased bowel sounds. **Explanation:** Necrotizing Enterocolitis (NEC) is the most common gastrointestinal emergency in neonates, particularly in preterm infants. It is characterized by ischemic necrosis of the intestinal mucosa, leading to inflammation and potential perforation. **Why "Increased bowel sounds" is the correct answer:** In NEC, the inflammatory process and intestinal ischemia lead to **ileus** (functional obstruction). As the bowel becomes distended and aperistaltic, bowel sounds become **absent or sluggish (decreased)**. Increased or hyperactive bowel sounds are typically seen in early mechanical obstruction, not in the paralytic state associated with NEC. **Analysis of incorrect options:** * **Abdominal distension:** This is the most common clinical sign of NEC, resulting from gas accumulation in the bowel loops due to ileus and bacterial fermentation. * **Metabolic acidosis:** This is a systemic sign of advanced NEC. It indicates poor tissue perfusion, sepsis, or bowel gangrene, often serving as a marker for clinical deterioration. * **Pneumoperitoneum:** This is a radiographic hallmark of intestinal perforation (Stage IIIb in Bell’s Staging). It appears as "free air under the diaphragm" and is an absolute indication for surgical intervention. **High-Yield Clinical Pearls for NEET-PG:** * **Pneumatosis intestinalis:** The pathognomonic radiographic finding in NEC (gas within the bowel wall). * **Bell’s Staging:** Used to classify the severity of NEC (Stage I: Suspected, Stage II: Definite, Stage III: Advanced). * **Risk Factors:** Prematurity (most significant), formula feeding, and intestinal ischemia. * **Portal Venous Gas:** A sign of severe disease (Stage IIb).

Question 1

A term baby presents with breathing difficulty. The mother had a normal antenatal period and labor. On examination, the baby is in respiratory distress, with a flat abdomen and no organomegaly. What is the most likely cause?

Accepted Answer

Diaphragmatic hernia

Answer

Congenital heart disease with dextrocardia

Answer

Respiratory distress syndrome

Answer

Aspiration pneumonia

Question 2

Which of the following conditions is most likely to lead to transient tachypnea of the newborn?

Accepted Answer

A term infant delivered via cesarean section.

Answer

A term infant delivered via spontaneous vaginal delivery.

Answer

A term infant delivered via forceps-assisted vaginal delivery.

Answer

None of the above.

Question 3

Intrauterine growth restriction (IUGR) is commonly associated with which of the following infections?

Accepted Answer

All of the above

Answer

Rubella

Answer

Syphilis

Answer

Cytomegalovirus (CMV)

Question 4

What is the normal respiratory rate in a newborn?

Accepted Answer

40-60 breaths/minute

Answer

10-20 breaths/minute

Answer

30-40 breaths/minute

Answer

60-80 breaths/minute

Question 5

All of the following can occur in a neonate for heat production except?

Accepted Answer

Shivering

Answer

Breakdown of brown fat with adrenaline secretion

Answer

Universal flexion like a fetus

Answer

Cutaneous vasoconstriction

Question 6

Which of the following infections can be transmitted through breast milk?

Accepted Answer

Cytomegalovirus (CMV)

Answer

Tuberculosis

Answer

Varicella

Answer

Rubella

Question 7

Which drug is used in neonatal resuscitation?

Accepted Answer

All of the above

Answer

Adrenaline

Answer

Sodium bicarbonate

Answer

Naloxone

Question 8

About caput succedaneum, all are true EXCEPT:

Accepted Answer

It can predispose to prolonged jaundice

Answer

It is a soft and boggy swelling

Answer

It resolves in 48-72 hours

Answer

Vacuum-assisted delivery is one of the common underlying causes

Question 9

A 1.5 kg child born at 32 weeks via LSCS presents with moderate respiratory difficulty. What is the appropriate management?

Accepted Answer

CPAP

Answer

Mechanical ventilation

Answer

Warm oxygen

Answer

Surfactant and ventilation

Question 10

Which of the following is NOT a feature of neonatal necrotizing enterocolitis?

Accepted Answer

Increased bowel sounds

Answer

Abdominal distension

Answer

Metabolic acidosis

Answer

Pneumoperitoneum

Neonatology — MCQs

Neonatology — MCQs

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