Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 831: What is the ponderal index of a neonate weighing 2 kg with a length of 50 cm?

A. 3.6
B. 2.2
C. 2.6
D. 16 (Correct Answer)

Explanation: ***16*** - The **ponderal index** using the clinical formula is calculated as: Weight in kg / (Length in meters)³ - For a neonate weighing 2 kg with a length of 50 cm (0.5 meters): **2 / (0.5)³ = 2 / 0.125 = 16** - This formula is commonly used in clinical practice and yields values typically between 12-30 for neonates - A ponderal index around 16 is within normal range and indicates appropriate body proportions for a neonate - The ponderal index helps assess nutritional status and body proportionality, distinguishing between symmetric and asymmetric growth restriction *Incorrect: 3.6* - This value does not result from the standard ponderal index formula for the given measurements - Would suggest using incorrect units or miscalculation of the formula *Incorrect: 2.2* - This value represents the ponderal index if using the alternative formula: (Weight in g / Length in cm³) × 100 - However, that formula yields 1.6, not 2.2 - This represents a value in the normal range for the g/cm³ formula (2.0-3.0) but doesn't match the calculation *Incorrect: 2.6* - Like option 2.2, this falls within the normal range for the g/cm³ × 100 formula (2.0-3.0) - However, it does not result from the correct calculation using the given weight and length - Represents a miscalculation or confusion between different formula variants

Question 832: A premature infant born at 28 weeks presents with respiratory distress syndrome. What is the most likely cause of this condition?

A. Patent ductus arteriosus
B. Meconium aspiration
C. Surfactant deficiency (Correct Answer)
D. Transient tachypnea of the newborn

Explanation: ***Surfactant deficiency*** - **Premature infants**, especially those born before 34 weeks of gestation, have immature lungs that produce insufficient amounts of **surfactant**. - **Surfactant** is crucial for reducing surface tension in the alveoli, preventing their collapse and ensuring proper gas exchange. Its deficiency leads to **respiratory distress syndrome (RDS)**. *Patent ductus arteriosus* - While common in premature infants and can exacerbate respiratory distress, **patent ductus arteriosus** (PDA) is a cardiac issue related to the shunting of blood, not the primary cause of respiratory distress syndrome itself. - PDA typically presents with signs of **heart failure** and **pulmonary overcirculation** rather than primary lung immaturity. *Meconium aspiration* - **Meconium aspiration syndrome** occurs when a fetus inhales meconium (fetal stool) into the lungs, usually in association with **post-term pregnancy** or **fetal distress**. - This infant is premature (28 weeks), making meconium aspiration highly unlikely as a primary cause of RDS. *Transient tachypnea of the newborn* - **Transient tachypnea of the newborn (TTN)** is typically seen in **term or near-term infants** following a **cesarean section** or rapid vaginal delivery, resulting from retained fetal lung fluid. - TTN usually resolves within 24-48 hours and is not characterized by the severe respiratory failure associated with **surfactant deficiency** in premature infants.

Question 833: In neonatal resuscitation, when are chest compressions indicated?

A. HR < 60/min (Correct Answer)
B. HR < 100/min
C. Absent breathing
D. Cyanosis

Explanation: ***HR < 60/min*** - **Chest compressions** are indicated in neonatal resuscitation when the **heart rate (HR)** remains **below 60 beats per minute** despite **adequate ventilation** for 30-60 seconds. - This threshold signifies severe bradycardia that is unresponsive to initial respiratory support and requires direct circulatory assistance. *HR < 100/min* - A heart rate **below 100 beats per minute** but **above 60 beats per minute** in a neonate typically indicates the need for continued **positive pressure ventilation (PPV)**. - Chest compressions are not initiated at this heart rate unless it further deteriorates to less than 60 bpm. *Absent breathing* - **Absent breathing** (apnea) in a neonate is an indication for initiating **positive pressure ventilation (PPV)**. - Chest compressions are only considered if the heart rate remains critically low despite effective ventilation. *Cyanosis* - **Cyanosis** (bluish discoloration of the skin) is a common sign of **hypoxemia** in newborns and usually indicates the need for **oxygen supplementation** and/or **positive pressure ventilation (PPV)**. - While it suggests respiratory distress, it does not directly trigger chest compressions unless associated with severe bradycardia.

Question 834: A preterm infant with a history of respiratory distress syndrome presents with a continuous murmur and bounding pulses. An echocardiogram reveals a patent ductus arteriosus (PDA). What is the first-line medical treatment for closing a PDA in preterm infants?

A. Propranolol
B. Indomethacin (Correct Answer)
C. Digoxin
D. Alprostadil

Explanation: ***Correct: Indomethacin*** - Indomethacin is a **prostaglandin synthesis inhibitor** (COX inhibitor) that leads to the constriction of the **ductus arteriosus** in preterm infants. - It is considered **first-line medical therapy** for hemodynamically significant patent ductus arteriosus (PDA) in preterm infants due to its efficacy in promoting ductal closure. - Mechanism: Blocks prostaglandin E2 production, which normally keeps the ductus arteriosus patent in fetal life. *Incorrect: Propranolol* - **Propranolol** is a **beta-blocker** primarily used to treat conditions like hypertension, angina, and certain arrhythmias. - It is **not indicated** for the closure of a PDA and would not be effective in this scenario. *Incorrect: Digoxin* - **Digoxin** is a cardiac glycoside used to improve **cardiac contractility** and control ventricular rate in certain heart conditions. - It does **not promote PDA closure** and is typically used for heart failure or supraventricular tachyarrhythmias. *Incorrect: Alprostadil* - **Alprostadil** is a **prostaglandin E1 analog** that **maintains patency** of the ductus arteriosus. - It is specifically used in infants with **ductal-dependent congenital heart defects** (e.g., critical coarctation, transposition of great arteries, pulmonary atresia) to ensure blood flow, which is the **opposite effect** desired for PDA closure.

Question 835: A neonate born to a mother with a history of opioid use during pregnancy presents with irritability, tremors, high-pitched cry, and poor feeding. What is the most appropriate initial management?

A. Immediate thyroid hormone replacement therapy
B. Empiric broad-spectrum antibiotics
C. Botulinum immunoglobulin (BIG-IV) administration
D. Supportive care with observation (swaddling, frequent feeding, minimal stimulation) (Correct Answer)

Explanation: ***Neonatal abstinence syndrome, start supportive care and observe*** - The combination of **irritability**, **tremors**, **high-pitched cry**, **poor feeding**, and maternal **opioid use during pregnancy** is highly suggestive of **neonatal abstinence syndrome (NAS)**. - Initial management for NAS involves **supportive care** including swaddling, frequent small feedings, minimal stimulation, and careful observation using standardized scoring (Finnegan score); pharmacotherapy (morphine or methadone) is reserved for severe cases that fail non-pharmacological measures. *Congenital hypothyroidism, begin thyroid hormone replacement* - While **hypotonia** and poor feeding can be symptoms of **congenital hypothyroidism**, the acute presentation of **irritability, tremors, and high-pitched cry** combined with maternal **opioid use** points strongly to NAS rather than hypothyroidism. - **Thyroid hormone replacement** is the correct treatment for congenital hypothyroidism, but newborn screening results typically take days, and this acute presentation requires immediate recognition of withdrawal. *Neonatal sepsis, initiate broad-spectrum antibiotics* - **Neonatal sepsis** can cause poor feeding and irritability, but the constellation of **tremors, high-pitched cry**, and **maternal opioid use history** makes NAS the primary diagnosis. - While sepsis must always be considered in ill-appearing neonates, **antibiotics** are for bacterial infection, not drug withdrawal; NAS symptoms typically emerge 24-72 hours after birth, not immediately. *Botulism, administer botulinum antitoxin* - **Infant botulism** presents with **descending flaccid paralysis, hypotonia**, and poor feeding due to neurotoxin-induced muscle paralysis, typically from **ingestion of *Clostridium botulinum* spores** (e.g., honey exposure after 6 months). - This neonate shows **increased irritability and tremors** (hyperexcitability), not the flaccid paralysis of botulism; **botulinum immunoglobulin** (BIG-IV) is not indicated for NAS.

Question 836: A term newborn at 48 hours of age with jaundice has a bilirubin level of 20 mg/dL. Which treatment would be required immediately?

A. Phototherapy (Correct Answer)
B. Ursodeoxycholic acid
C. Intravenous immunoglobulin
D. Exchange transfusion

Explanation: ***Phototherapy*** - A bilirubin level of **20 mg/dL** in a 48-hour-old term newborn is **critically high** and requires **immediate intensive phototherapy** to prevent neurotoxicity. - According to **AAP guidelines**, this level is at the phototherapy threshold and approaching exchange transfusion levels (20-22 mg/dL at 48 hours). - **Intensive phototherapy** is the **first-line immediate treatment** that should be initiated without delay, as it converts unconjugated bilirubin into water-soluble isomers for excretion. - While this level is concerning, **intensive phototherapy is started first**, with close monitoring and preparation for exchange transfusion if bilirubin continues to rise or phototherapy fails. *Ursodeoxycholic acid* - This medication is used for **cholestatic liver diseases** to increase bile flow and protect hepatocytes. - It has **no role in treating unconjugated hyperbilirubinemia** and does not lower bilirubin levels rapidly enough for acute neonatal jaundice. *Intravenous immunoglobulin* - **IVIG** is used specifically for **isoimmune hemolytic disease** (Rh or ABO incompatibility) to reduce antibody-mediated hemolysis. - While it may be considered if hemolysis is documented, it is **not the primary immediate treatment** for hyperbilirubinemia itself; phototherapy directly addresses the elevated bilirubin. - IVIG is an adjunct therapy, not first-line management. *Exchange transfusion* - **Exchange transfusion** is reserved for **very high bilirubin levels** (typically >25 mg/dL in term infants at this age) unresponsive to intensive phototherapy, or when there are signs of **acute bilirubin encephalopathy**. - At 20 mg/dL, while this is critically high and near the threshold, the **immediate first step is intensive phototherapy**, not exchange transfusion. - Exchange transfusion would be prepared for and performed if phototherapy fails to reduce levels adequately within 4-6 hours or if bilirubin continues to rise.

Question 837: A preterm infant in the NICU is receiving Kangaroo Mother Care (KMC). Despite this, the infant is not gaining weight adequately. Analyze the situation and determine the most appropriate next step.

A. Increase the frequency of KMC sessions
B. Add supplemental tube feeding (Correct Answer)
C. Switch to conventional incubator care
D. Perform a complete nutritional assessment

Explanation: ***Add supplemental tube feeding*** - While KMC provides numerous benefits, **inadequate weight gain** indicates insufficient caloric intake. Therefore, **supplemental tube feeding** is the most direct way to ensure the infant receives adequate nutrition for growth. - This approach directly addresses the metabolic needs of a preterm infant who may not be able to consume enough through breastfeeding alone, even with the support of KMC. *Perform a complete nutritional assessment* - While a complete nutritional assessment is a good general practice, it is not the most immediate and appropriate next step when a preterm infant is demonstrating **inadequate weight gain** despite KMC. - The assessment may provide a deeper understanding, but the pressing issue is the lack of weight gain, which needs a more direct intervention like supplemental feeding. *Increase the frequency of KMC sessions* - Increasing the frequency of KMC sessions primarily enhances bonding, thermal regulation, and maternal milk production readiness, but it does **not directly address the caloric deficit** leading to inadequate weight gain. - Although KMC indirectly supports breastfeeding, if weight gain is already insufficient, more KMC alone without increased nutrition intake is unlikely to resolve the problem. *Switch to conventional incubator care* - Switching to conventional incubator care would remove the infant from the benefits of KMC, such as improved thermoregulation, reduced infections, and enhanced parent-infant bonding, with **no direct benefit for weight gain**. - This action would potentially exacerbate issues KMC helps to mitigate, and it does not provide any additional nutritional support.

Question 838: A preterm infant (32 weeks gestation) is stable in the NICU and receiving Kangaroo Mother Care (KMC). Despite good thermal stability and bonding, the infant is not gaining adequate weight. What is the most likely reason?

A. Inadequate supplemental feeding (Correct Answer)
B. KMC contraindicated at this gestational age
C. Need for incubator instead of KMC
D. Insufficient duration of KMC sessions

Explanation: ***Inadequate supplemental feeding*** - While KMC provides excellent thermal regulation, bonding, and physiological stability, **preterm infants have high nutritional demands** due to rapid growth and physiological immaturity. - Poor weight gain despite successful KMC most commonly indicates **insufficient caloric intake**, requiring assessment and optimization of feeding regimen (breast milk fortification, increased feeding frequency, or supplemental feeding). - KMC actually **enhances feeding outcomes** by promoting breastfeeding and better metabolic stability, but adequate nutrition must still be ensured through appropriate feeding support. *Insufficient duration of KMC sessions* - While longer KMC duration is beneficial for bonding and physiological stability, **inadequate weight gain** is primarily a nutritional issue, not a KMC duration issue. - Evidence shows even intermittent KMC provides significant benefits; duration alone would not explain poor weight gain if feeding is adequate. *Need for incubator instead of KMC* - **KMC is superior to incubator care** for stable preterm infants in terms of mortality, infection rates, breastfeeding success, and neurodevelopmental outcomes. - Since the infant is described as stable with good thermal regulation, switching to an incubator would not address the weight gain issue and would lose KMC benefits. *KMC contraindicated at this gestational age* - KMC is **recommended for stable preterm infants** regardless of gestational age, including those born at 32 weeks. - The infant's stability indicates KMC is appropriate; gestational age is not the issue here.

Question 839: What is the most appropriate method to measure fever in a newborn?

A. Oral thermometer
B. Axillary thermometer
C. Rectal thermometer (Correct Answer)
D. Ear thermometer

Explanation: ***Rectal thermometer*** - Rectal temperature measurement is considered the **gold standard** for accuracy in newborns and infants due to its proximity to the body's core temperature. - It provides the most reliable indicator of **true body temperature**, which is crucial for identifying fever in this vulnerable population. *Oral thermometer* - Oral temperature measurement is **not feasible** in newborns and infants due to their inability to hold the thermometer under their tongue and keep their mouths closed. - This method is also less accurate in young children who may be breathing through their mouths or consuming liquids, affecting readings. *Axillary thermometer* - Axillary temperature measurement is a **convenient and non-invasive** method, but it is generally less accurate and reliable than rectal temperatures in newborns. - Readings can be influenced by environmental factors and the placement of the thermometer, potentially leading to **underestimation of fever**. *Ear thermometer* - Ear (tympanic) thermometers can be **less accurate in newborns** due to their small ear canals and the technique required for proper placement. - The accuracy can also be affected by **earwax** or improper positioning, making it less reliable for critical fever assessment in infants.

Question 840: In the NICU, some infants receiving Kangaroo Mother Care (KMC) do not gain weight adequately. What is the best recommendation to improve their weight gain?

A. Focus KMC on stable infants
B. Add supplemental feeding (Correct Answer)
C. Increase KMC duration
D. Limit KMC to term infants

Explanation: ***Add supplemental feeding*** - For infants receiving KMC who are not gaining weight adequately, providing **supplemental feeding**, such as expressed breast milk, formula, or fortified breast milk, is crucial to meet their increased caloric needs. - **Improved nutrition** directly addresses the underlying cause of poor weight gain, providing the necessary energy and nutrients for growth. *Focus KMC on stable infants* - While KMC is beneficial for stable infants, limiting its application does not address the nutritional deficit of infants who are already receiving KMC and failing to gain weight. - KMC is widely recommended for both stable and some unstable preterm infants to improve their **physiological stability** and **parent-infant bonding**, not primarily as a weight-gain strategy by itself. *Increase KMC duration* - Increasing the duration of KMC alone does not directly address the caloric deficit responsible for inadequate weight gain if the infant's nutritional intake is insufficient. - While prolonged skin-to-skin contact has numerous benefits, it's not a substitute for adequate **caloric intake** when weight gain is a concern. *Limit KMC to term infants* - KMC is especially beneficial for **preterm and low-birth-weight infants** due to its positive effects on temperature regulation, breastfeeding, and growth. - Limiting KMC to term infants would deny the significant benefits to the vulnerable population who most need it.

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

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free