Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 931: A neonate presenting with ascites is diagnosed with urinary ascites. What is the most common cause?

A. Bilateral PUJ obstruction
B. Infant polycystic kidney disease
C. Posterior urethral valve (Correct Answer)
D. Meatal stenosis

Explanation: ***Posterior urethral valve*** - **Posterior urethral valve (PUV)** is the most common cause of **urinary tract obstruction** in male neonates, leading to severe bladder outflow obstruction, often resulting in **urinary ascites** due to urinary extravasation. - The obstruction causes high pressure in the bladder and urinary tract, which can lead to rupture of the urinary system (e.g., bladder, renal pelvis, ureters) and leakage of urine into the peritoneal cavity. *Bilateral PUJ obstruction* - While **pelvic-ureteric junction (PUJ) obstruction** can cause hydronephrosis, bilateral obstruction leading to urinary ascites is less common than PUV. - PUJ obstruction primarily affects the flow of urine from the kidney to the ureter, and although severe, is less likely to cause widespread urinary extravasation into the peritoneum compared to distal urethral obstruction. *Infant polycystic kidney disease* - **Infant polycystic kidney disease (ARPKD)** is characterized by enlarged kidneys with numerous cysts, leading to renal dysfunction and often pulmonary hypoplasia. - While ARPKD can cause significant renal pathology, it does not typically lead to urinary ascites through obstructive mechanisms; ascites, if present, is usually due to liver fibrosis or heart failure, not urinary obstruction. *Meatal stenosis* - **Meatal stenosis** is a narrowing of the urethral opening, which can cause urinary obstruction but is usually a less severe and more distal obstruction compared to PUV. - It might cause symptoms like a thin stream or dysuria but is rarely severe enough in neonates to cause back pressure leading to urinary extravasation and ascites.

Question 932: What is the maximum time frame for defining early-onset neonatal sepsis after birth?

A. 72 (Correct Answer)
B. 24
C. 48
D. 60

Explanation: ***72*** - Early-onset neonatal sepsis is defined as sepsis occurring within the first **72 hours of life**. - This timeframe is crucial because infections acquired during this period are typically thought to be due to **vertically transmitted organisms** from the mother. *24* - While some signs of sepsis may appear within 24 hours, this is not the **maximum duration** defining early-onset sepsis. - Many infants with early-onset sepsis may not manifest symptoms until **after 24 hours**. *48* - This period is often used to differentiate severe initial presentations, but it does not represent the full window for classifying an infection as **early-onset neonatal sepsis**. - The 48-hour mark is frequently considered in evaluating **risk factors** and initial management, but not the final diagnostic cutoff. *60* - This timeframe is not a standard cutoff used in the definition of **early-onset neonatal sepsis**. - The established clinical definitions generally use **72 hours** as the upper limit for this classification.

Question 933: What does an Apgar score of 6 indicate about a newborn's condition?

A. Child is in fair condition
B. Child is moderately distressed (Correct Answer)
C. Child is in critical condition
D. Immediate resuscitation is required

Explanation: *Incorrect Option: Child is in fair condition* - An Apgar score of 7 to 10 usually indicates that the baby is in **good to excellent condition** and requires only routine care. - A score of 6 falls below this range, suggesting more than just a "fair" condition, as it points to some level of physiological compromise. ***Correct Option: Child is moderately distressed*** - An Apgar score between 4 and 6 typically indicates that the newborn is experiencing **moderate distress** and may require some **assistance with breathing** or other vital functions. - This score suggests that while not critically ill, the infant is not in optimal condition and warrants close observation and potential intervention. *Incorrect Option: Child is in critical condition* - Apgar scores of 0 to 3 are indicative of **severe distress** or critical condition, often requiring immediate and extensive resuscitation efforts. - A score of 6, while concerning, is not in the severe range that would classify the child as critically ill. *Incorrect Option: Immediate resuscitation is required* - While a score of 6 may prompt interventions, **immediate and extensive resuscitation** is more typically indicated for Apgar scores of 0-3. - At a score of 6, interventions might include tactile stimulation, oxygen administration, or assisted ventilation, rather than aggressive resuscitative measures like chest compressions or medications.

Question 934: At what time after birth does the umbilical cord normally become black due to physiological necrosis?

A. 2-3 days after birth (Correct Answer)
B. 5-7 days after birth
C. 10-14 days after birth
D. 7-10 days after birth

Explanation: ***2-3 days after birth*** - The **umbilical cord** usually begins to **dry and blacken** within the first 2-3 days post-delivery due to physiological necrosis. - This process is a normal part of the **umbilical cord stump's desiccation** before it eventually falls off. *5-7 days after birth* - While the cord is typically still drying and changing color at this stage, the initial blackening due to **physiological necrosis** usually occurs earlier. - By this time, the cord is often well into its drying phase, possibly appearing shriveled and dark, but the onset of blackening is earlier. *10-14 days after birth* - This timeframe is typically when the **umbilical cord stump** completely falls off, not when it initially turns black. - If the cord is still present or only beginning to blacken at this point, it could indicate a **delayed cord separation**, which might warrant medical attention. *7-10 days after birth* - While the cord stump usually falls off around this period, the initial process of **blackening due to necrosis** begins earlier, typically in the first few days. - The cord is generally very dry and shriveled by this time, getting ready to detach.

Question 935: All the following factors affect APGAR score except:

A. Prematurity
B. Maternal sedation/analgesia
C. Mode of delivery (Correct Answer)
D. Neurological condition of the newborn

Explanation: ***Mode of delivery*** - The **Apgar score** assesses the newborn's physiological response to birth and immediate postnatal adaptation, not the method of birth itself. - While certain delivery complications might indirectly affect a newborn's Apgar, the mode of delivery (e.g., vaginal birth vs. C-section) is not a direct factor in the Apgar score calculation. *Prematurity* - **Premature infants** often have immature organ systems, which can lead to lower Apgar scores due to decreased tone, respiratory effort, or heart rate. - Their physiological state at birth directly influences the measured parameters of the **Apgar score**. *Maternal sedation/analgesia* - Medications given to the mother during labor can cross the placenta and **depress the newborn's central nervous system**, affecting respiratory effort, muscle tone, and reflexes, thereby lowering Apgar scores. - **Opioids** and **benzodiazepines** are common culprits that can cause a temporary decrease in the newborn's Apgar score. *Neurological condition of the newborn* - The Apgar score directly assesses **neuromuscular tone** (muscle tone) and **reflex irritability**, which are indicators of the newborn's neurological status. - A newborn with a significant neurological condition may exhibit poor tone, absent reflexes, and respiratory depression, all of which would lead to a lower Apgar score.

Question 936: Which of the following is least likely to be seen in Small for Gestational Age (SGA) infants?

A. Polycythemia
B. Intracranial bleed (Correct Answer)
C. Hypocalcemia
D. Hypoglycemia

Explanation: ***Intracranial bleed*** - While **intracranial hemorrhage** can occur in any infant due to birth trauma, it is **not specifically associated with SGA** infants more than with appropriate-for-gestational-age infants. - The primary factors predisposing to intracranial bleeding are **prematurity** and events causing **hypoxia-ischemia**, not primarily being small for gestational age. *Hypoglycemia* - SGA infants have **limited glycogen stores** and reduced gluconeogenesis due to chronic nutritional deprivation, making them prone to **hypoglycemia**. - Their increased metabolic demands relative to their size further exacerbate the risk of **low blood glucose**. *Polycythemia* - Chronic fetal hypoxia, a common cause of SGA, stimulates **erythropoietin production**, leading to increased red blood cell mass and **polycythemia**. - Elevated blood viscosity due to polycythemia can cause various complications, including **thrombosis** and **hyperbilirubinemia**. *Hypocalcemia* - SGA infants often experience **perinatal stress** and conditions like **asphyxia**, which can disrupt calcium homeostasis. - They may have **impaired parathyroid hormone response** or calcitonin dysregulation, contributing to **low serum calcium levels**.

Question 937: Which of the following congenital conditions is most commonly associated with preterm delivery?

A. Spina bifida
B. Anencephaly (Correct Answer)
C. Congenital adrenal hyperplasia
D. Gastroschisis

Explanation: ***Anencephaly*** - This condition is most commonly associated with **polyhydramnios**, an excess of **amniotic fluid**, which can lead to **premature rupture of membranes** and **preterm delivery** - The polyhydramnios occurs due to **impaired fetal swallowing** resulting from the absent brain structures - Due to the **absence of a significant portion of the brain and skull**, fetuses with anencephaly are considered incompatible with life and approximately **50% of pregnancies with anencephaly result in preterm delivery** *Spina bifida* - While it is a **neural tube defect**, it typically does not directly cause **preterm labor or delivery** in the same manner as anencephaly - Most pregnancies with spina bifida proceed to term unless there are associated complications like **polyhydramnios** (which is less common than with anencephaly) - The primary concern with spina bifida is typically its neurological impact, not its direct link to **preterm birth** *Gastroschisis* - This is an **abdominal wall defect** where bowel herniates through a defect lateral to the umbilicus - While **over 50% of gastroschisis cases deliver preterm**, the association is **not as strong or consistent as with anencephaly** - Preterm delivery in gastroschisis may be due to **polyhydramnios, bowel complications**, or **elective early delivery** rather than spontaneous preterm labor *Congenital adrenal hyperplasia* - This is an **endocrine disorder** affecting the **adrenal glands' ability to produce certain hormones** - It does not typically lead to complications such as **polyhydramnios** or directly cause **preterm labor and delivery** - Pregnancies with CAH usually proceed to term without increased risk of preterm delivery

Question 938: Which of the following is a sign of good attachment during breastfeeding?

A. Dimpling of cheeks during sucking
B. Baby's chin touching the breast with mouth wide open (Correct Answer)
C. Clicking or smacking sounds during feeding
D. Baby's lips are pursed or turned inward

Explanation: ***Baby's chin touching the breast with mouth wide open*** - This is a **key sign of good attachment** during breastfeeding, indicating proper positioning. - When the baby's **chin touches the breast** and the **mouth is wide open**, it ensures a **deep latch** with much of the areola in the mouth. - Other signs of good attachment include **cheeks rounded** (not dimpled), **lips flanged outward**, and **rhythmic sucking** with audible swallowing. - Good attachment ensures **effective milk transfer** and prevents **nipple trauma**. *Baby's lips are pursed or turned inward* - This indicates a **poor latch**, as the baby's lips should be flanged outward to create a good seal. - Pursed or tucked-in lips can cause **nipple pain** and **ineffective milk transfer**. *Clicking or smacking sounds during feeding* - These sounds are signs of a **poor vacuum seal** and **ineffective attachment**. - Good attachment produces **rhythmic sucking** with **audible swallowing**, not clicking sounds. *Dimpling of cheeks during sucking* - **Dimpled cheeks** indicate the baby is sucking on the cheeks rather than effectively drawing milk from the breast. - This is a sign of **poor attachment** and **inefficient milk transfer**; cheeks should appear **rounded** with good attachment.

Question 939: Resuscitation of term neonates should be initiated with what oxygen concentration if they require positive pressure ventilation?

A. 100%
B. 50%
C. 30%
D. 21% (Correct Answer)

Explanation: ***21%*** - Current guidelines from the **American Academy of Pediatrics** and **American Heart Association** recommend initiating resuscitation for term neonates with **room air (21% oxygen)**. - Using room air helps avoid potential risks associated with **hyperoxia**, such as oxidative stress and lung injury, while still providing adequate oxygenation for most neonates. *100%* - Initiating with **100% oxygen** is generally discouraged for term neonates due to the risk of **oxidative damage** and its potential association with adverse outcomes. - High oxygen concentrations are reserved for situations where adequate oxygenation cannot be achieved with lower concentrations, indicated by persistent **cyanosis** or **low SpO2 readings**. *50%* - This concentration is an arbitrary choice and is **not recommended** as a starting point for term neonate resuscitation. - It would still carry a higher risk of hyperoxia compared to room air without clear evidence of benefit over 21% in initial steps. *30%* - While lower than 100%, 30% oxygen is also **not the recommended initial concentration** for term neonates. - Adjustments to oxygen concentration should be guided by **pulse oximetry readings** and the neonate's clinical response, starting from room air.

Question 940: All of the following are features of physiologic jaundice, except which of the following?

A. Total bilirubin of less than 15 mg/dl
B. Disappearance of jaundice by 3-4 weeks in preterm infant
C. Jaundice visible within 24 hrs of age (Correct Answer)
D. Rate of rise of bilirubin less than 3 mg/dl per day

Explanation: ***Jaundice visible within 24 hrs of age*** - The appearance of **jaundice within the first 24 hours of life** is a hallmark of **pathologic jaundice**, not physiologic jaundice. - This early onset suggests a more serious underlying cause, such as **hemolytic disease of the newborn**, and warrants prompt investigation. *Total bilirubin of less than 15 mg/dl* - In physiologic jaundice, the **total serum bilirubin level** typically peaks at less than 15 mg/dL in full-term infants. - Higher bilirubin levels, especially above 15 mg/dL, would raise suspicion for a **pathologic cause**. *Disappearance of jaundice by 3-4 weeks in preterm infant* - While physiologic jaundice in full-term infants usually resolves by 1-2 weeks, in **preterm infants**, it can persist longer, up to 3-4 weeks. - This extended duration is due to the **immaturity of the preterm infant's liver** in conjugating bilirubin. *Rate of rise of bilirubin less than 3 mg/dl per day* - A gradual increase in bilirubin, with a rate of rise **less than 3 mg/dL per day**, is characteristic of physiologic jaundice. - A **rapid increase** (>5 mg/dL/day) is a red flag for **pathologic jaundice** and requires further evaluation.

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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