Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 921: Which of the following statements about the differences between neonates and adults is true?

A. They can tolerate large doses of certain drugs on body weight basis.
B. Their excretory ability of the kidney is less well developed. (Correct Answer)
C. Their gastric emptying is prolonged.
D. Their hepatic metabolizing enzyme activity is slower.

Explanation: ***Their excretory ability of the kidney is less well developed.*** - Neonates have **immature renal function** with lower glomerular filtration rate (GFR) and tubular secretion/reabsorption capabilities compared to adults. - This reduced excretory capacity affects the **elimination of renally cleared drugs**, often requiring dose adjustments. - This is a **universally accepted true statement** about neonatal physiology. *Their gastric emptying is prolonged.* - While gastric emptying in neonates is indeed slower and more variable than in adults, the statement as written is **somewhat ambiguous** because "prolonged" could be interpreted different ways. - However, **this statement is also factually TRUE** - neonatal gastric emptying IS prolonged compared to adults. - **Note:** This creates ambiguity as both this and the correct answer are true statements. *They can tolerate large doses of certain drugs on body weight basis.* - This is **FALSE** - Neonates generally have **reduced drug tolerance** compared to adults due to immature organ systems. - They are **more susceptible to adverse drug effects** and typically require lower mg/kg doses for most medications. - This is the only clearly **incorrect** statement among the options. *Their hepatic metabolizing enzyme activity is slower.* - This is **TRUE** - The activity of many hepatic drug-metabolizing enzymes (e.g., **cytochrome P450 enzymes**, glucuronidation) is **reduced at birth**. - This slower metabolism can lead to **prolonged half-lives** and increased drug accumulation. - **Note:** This statement is also factually accurate, creating potential ambiguity. **Clinical Note:** This question has inherent ambiguity as three of the four statements are medically accurate. In exam context, the renal excretion option is selected as it represents the most fundamental and clinically significant difference affecting drug dosing in neonates.

Question 922: Severe hypothermia in a neonate is defined by a temperature below which of the following?

A. < 35 °C
B. < 34 °C
C. < 33 °C
D. < 32 °C (Correct Answer)

Explanation: ***< 32 °C*** - Severe hypothermia in neonates is defined by a body temperature falling below **32 °C** according to WHO classification. - This level of hypothermia is associated with significant physiological compromise including bradycardia, hypoglycemia, metabolic acidosis, and coagulopathy. - Requires immediate and aggressive warming interventions with continuous monitoring of vital signs and blood glucose. *< 35 °C* - A temperature below 35 °C falls into the **moderate hypothermia** range (32-35.9°C) in neonates, not mild. - While serious and requiring active warming, it is not classified as severe hypothermia. - May present with lethargy, poor feeding, and peripheral vasoconstriction. *< 34 °C* - A temperature below 34 °C is also within the **moderate hypothermia** category. - More concerning than temperatures closer to 35°C but does not meet the threshold for severe hypothermia. - Requires active warming and close monitoring but typically less aggressive than severe hypothermia management. *< 33 °C* - A temperature below 33 °C remains in the **moderate hypothermia** range, approaching the severe threshold. - While clinically significant, the WHO classification defines severe hypothermia specifically as <32°C. - The distinction is important for determining the urgency and intensity of warming protocols.

Question 923: With reference to Respiratory Distress Syndrome (RDS), which of the following statements is false?

A. Leads to respiratory distress in premature infants
B. Is less common in babies born to diabetic mothers (Correct Answer)
C. Is treated by administering surfactant therapy
D. Usually occurs in infants born before 34 weeks of gestation

Explanation: ***Is less common in babies born to diabetic mothers*** - Babies born to **diabetic mothers** are at an **increased risk** of Respiratory Distress Syndrome (RDS) due to delayed lung maturation caused by **hyperinsulinemia.** - Insulin inhibits the production of **surfactant**, a substance critical for reducing surface tension in the alveoli and preventing lung collapse. - This statement is **FALSE** - RDS is actually **MORE common** in infants of diabetic mothers. *Leads to respiratory distress in premature infants* - RDS is primarily a disease of **prematurity**, resulting from a deficiency of **surfactant** in the immature lungs. - This deficiency leads to widespread **atelectasis** (lung collapse), which causes breathing difficulties immediately or shortly after birth. - This statement is **TRUE**. *Is treated by administering surfactant therapy* - **Surfactant therapy** is a cornerstone of RDS treatment, often delivered via an **endotracheal tube**. - It works by replacing the deficient natural surfactant, thereby improving **lung compliance** and reducing the work of breathing. - This statement is **TRUE**. *Usually occurs in infants born before 34 weeks of gestation* - RDS predominantly affects infants born **before 34 weeks of gestation**, as their lungs are typically not mature enough to produce sufficient surfactant. - The risk **decreases significantly** with increasing gestational age, with full-term infants rarely developing the condition. - This statement is **TRUE**.

Question 924: A neonate has no respiratory efforts, no response or reflex to stimulation, a heart rate less than 100, blue extremities, and poor muscle tone. What is the total APGAR score?

A. 1
B. 2 (Correct Answer)
C. 3
D. 4

Explanation: ***Correct: 2*** - The APGAR score is calculated by evaluating five components, each scored 0-2 points: - **Appearance (color):** Blue extremities with pink body = **1 point** - **Pulse (heart rate):** <100 bpm = **1 point** - **Grimace (reflex irritability):** No response to stimulation = **0 points** - **Activity (muscle tone):** Poor/flaccid tone = **0 points** - **Respiration:** No respiratory effort = **0 points** - **Total score: 1 + 1 + 0 + 0 + 0 = 2 points** - This indicates a severely depressed neonate requiring immediate resuscitation *Incorrect: 1* - A score of 1 would indicate only one parameter scoring 1 point - In this scenario, **two parameters** (heart rate and color) each score 1 point - The clinical findings described yield a total of 2 points, not 1 *Incorrect: 3* - A score of 3 would require an additional point from any category - This could occur with some grimace response (1 point) or some flexion of extremities (1 point) - The described neonate has **no reflex response** and **poor muscle tone**, so neither category contributes points beyond what's already counted *Incorrect: 4* - A score of 4 would indicate better overall status with additional positive findings - This might include moderate respiratory effort (1 point), good grimace (1-2 points), or better muscle tone (1-2 points) - The clinical presentation described is much more severe, with complete absence of respiratory effort and reflex responses

Question 925: All of the following are true about "secondary apnea" in a neonate except:

A. HR may become < 100/min
B. It may be present even at birth
C. Baby may respond to tactile stimulation (Correct Answer)
D. The baby is not breathing

Explanation: ***Baby may respond to tactile stimulation*** - In **secondary apnea**, the neonate is typically in a state of **cardiovascular depression** and will not respond to simple tactile stimulation. - Active resuscitation with **positive pressure ventilation** is usually required to reverse secondary apnea. *The baby is not breathing* - This is true because **apnea** by definition means the temporary cessation of breathing, and in this phase, respirations have ceased. - Absence of breathing is the key characteristic of both primary and secondary apnea. *HR may become < 100/min* - This is true, as **secondary apnea** is associated with **profound bradycardia** and a significant decline in heart rate, often below 100 bpm. - The drop in heart rate indicates worsening **hypoxia** and **acidosis**. *It may be present even at birth* - This is true, as a neonate can enter secondary apnea if they experience significant **hypoxia** and stress **in utero** or during the birth process. - Factors like placental insufficiency, cord compression, or difficult delivery can lead to this state at the moment of birth.

Question 926: A tuft of hair over the lumbosacral region in a newborn is most commonly suggestive of:

A. Dermoid cyst
B. Spina bifida occulta (Correct Answer)
C. Tumor
D. Sinus tract

Explanation: ***Spina bifida occulta*** - A **lumbosacral hair tuft** (hypertrichosis) is a classic **cutaneous stigmata** indicating underlying **spinal dysraphism**. - **Spina bifida occulta** is the **most common association** with this finding—it represents incomplete fusion of the vertebral arches without herniation of neural elements. - This is often asymptomatic but requires **imaging evaluation** (ultrasound in infants <6 months, MRI if older) to rule out tethered cord or other occult spinal anomalies. - Other cutaneous markers include dimples (above gluteal crease), lipomas, hemangiomas, and dermal sinuses. *Tumor* - While subcutaneous tumors like **lipomas** or **lipomyelomeningoceles** can present with overlying hair tufts, they are typically palpable masses and less common than spina bifida occulta. - These would also fall under the spectrum of spinal dysraphism requiring imaging. *Sinus tract* - A **dermal sinus tract** can be associated with a hair tuft but more commonly presents with a visible **dimple or opening** above the gluteal crease. - This carries risk of CNS infection (meningitis) and requires surgical intervention. *Dermoid cyst* - Dermoid cysts can present with overlying skin changes but are not the most common cause of isolated hair tufts in the lumbosacral region.

Question 927: What is the appropriate treatment for a neonate with nasal congestion?

A. Oral antibiotics
B. Normal saline nose drops (Correct Answer)
C. Oral antihistamines
D. Parenteral antibiotics

Explanation: ***Normal saline nose drops*** - **Normal saline nose drops** help to thin nasal secretions and moisturize the nasal passages, making it easier for the neonate to breathe. - This is a **safe and effective** first-line treatment for nasal congestion in neonates, as it avoids systemic side effects. *Oral antihistamines* - Oral antihistamines are generally **not recommended** for neonates due to potential side effects like drowsiness, irritability, and respiratory depression. - They are also not very effective for clearing thick nasal secretions, which is often the cause of congestion in infants. *Oral antibiotics* - Nasal congestion in neonates is typically **viral** in origin or due to environmental factors, making antibiotics ineffective and unnecessary. - **Overuse of antibiotics** can lead to antibiotic resistance and disrupt the infant's normal gut flora. *Parenteral antibiotics* - Parenteral antibiotics are reserved for **severe bacterial infections** and are an inappropriate treatment for uncomplicated nasal congestion. - They carry risks such as pain, infection at the injection site, and systemic side effects, which are not justified for mild symptoms.

Question 928: A newborn whose weight is less than 1500 grams is termed as

A. Low birth weight
B. Very low birth weight (Correct Answer)
C. Not a recognized classification
D. Extremely low birth weight

Explanation: ***Very low birth weight*** - A newborn with a birth weight **less than 1500 grams** is classified as very low birth weight (VLBW). - This category is associated with increased risks of morbidity and mortality for the infant. - VLBW includes all infants weighing <1500g, encompassing both those between 1000-1499g and those <1000g. *Low birth weight* - This classification applies to infants born weighing **less than 2500 grams**, which is a broader category. - It includes VLBW infants as well as those weighing between 1500-2499 grams. *Not a recognized classification* - This is incorrect as <1500g is a well-established and recognized classification. - Birth weight classifications are critical for assessing neonatal risks and guiding clinical management. *Extremely low birth weight* - This term is reserved for infants born weighing **less than 1000 grams**. - ELBW is a subset of VLBW, representing the highest-risk group. - Infants in this category face the highest risks of severe health complications and long-term developmental issues.

Question 929: What is the next step in managing a 3-day-old neonate with a bilirubin level of 18 mg/dL?

A. Stop breastfeeding
B. Start phototherapy and stop breastfeeding
C. Exchange transfusion
D. Start phototherapy and continue breastfeeding (Correct Answer)

Explanation: ***Start phototherapy and continue breastfeeding*** - A bilirubin level of **18 mg/dL** in a 3-day-old neonate exceeds the threshold for high-intermediate risk zone on the **Bhutani nomogram**, thus requiring **phototherapy** to prevent severe hyperbilirubinemia and **kernicterus**. - **Breastfeeding** should be continued as it is crucial for hydration and nutrition, and interruption is usually not indicated unless there is a specific and confirmed diagnosis of **breast milk jaundice** with extremely high bilirubin levels. - **Monitoring** for response to phototherapy and further intervention if bilirubin continues to rise is essential. *Stop breastfeeding* - Stopping breastfeeding is a measure reserved for specific and severe cases of **breast milk jaundice**, where the bilirubin levels are very high and unresponsive to phototherapy, which is not indicated here. - Interruption of breastfeeding often leads to **dehydration**, which can worsen hyperbilirubinemia, and may discourage successful long-term breastfeeding. *Start phototherapy and stop breastfeeding* - While **phototherapy** is indicated, stopping breastfeeding is generally not recommended unless there's a strong indication of **breast milk jaundice** needing a trial of formula feeding, which is not the typical first step. - This approach combines a necessary intervention with an often counterproductive one, as adequate fluid intake through breastfeeding helps **bilirubin excretion**. *Exchange transfusion* - **Exchange transfusion** is considered for neonates with very high bilirubin levels (typically **>25 mg/dL** in this age group, or if there are signs of **acute bilirubin encephalopathy**) that are unresponsive to intensive phototherapy. - A bilirubin level of **18 mg/dL** in an otherwise healthy 3-day-old is below the typical threshold for immediate exchange transfusion and would usually warrant phototherapy initially.

Question 930: Cephalhematoma usually disappears within what timeframe?

A. 6–8 weeks (Correct Answer)
B. 4–6 months
C. 2–4 weeks
D. 5–7 weeks

Explanation: ***6–8 weeks*** - A **cephalhematoma** is a collection of blood under the periosteum of a neonate's skull bone, typically resolving within **6–8 weeks** as the blood is slowly reabsorbed. - This timeframe represents the most commonly cited resolution period in standard pediatric references for uncomplicated cephalhematomas. - Complete resolution may occasionally extend to **2-3 months** in larger hematomas, but most resolve by 8 weeks. *5–7 weeks* - While some cephalhematomas may begin to resolve by this timeframe, **6–8 weeks** is more consistently reported in pediatric literature as the typical complete resolution period. - This slightly shorter timeframe doesn't account for the slower reabsorption rate seen in many cases, particularly with larger hematomas. *2–4 weeks* - **Cephalhematomas** rarely resolve this quickly, as the subperiosteal location and the slow rate of blood reabsorption usually require a longer period. - Resolution within this short timeframe is more characteristic of **caput succedaneum**, which involves superficial edema rather than subperiosteal blood collection and resolves within days. *4–6 months* - This timeframe is generally too long for the resolution of a typical **cephalhematoma** and would suggest potential complications. - Such prolonged persistence could indicate **calcification** of the hematoma or a very large collection requiring extended reabsorption time, which is uncommon.

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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