Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 961: Which of the following is the most important associated finding with apnea in a preterm baby?

A. Associated with bradycardia (Correct Answer)
B. Leads to hypoxia
C. May cause cyanosis
D. Cessation of breathing for more than 20 seconds

Explanation: ***Associated with bradycardia*** - Apnea of prematurity is defined by a cessation of breathing lasting more than 20 seconds, or a shorter pause accompanied by **bradycardia** (heart rate <100 bpm) or **cyanosis**. - **Bradycardia** is the most consistent and clinically significant associated finding with apneic spells in preterm infants, indicating cardiorespiratory compromise. - Bradycardia often occurs early and serves as a critical monitoring parameter for detecting and managing apneic episodes. *Leads to hypoxia* - While apnea can lead to **hypoxia** (decreased oxygen saturation), this is a consequence of prolonged apneic episodes. - Hypoxia develops more gradually, whereas **bradycardia** is an immediate physiological response that alerts clinicians to intervene. *May cause cyanosis* - **Cyanosis** (bluish discoloration due to deoxygenated hemoglobin) is an important clinical sign of severe apnea. - However, cyanosis typically appears after hypoxia has developed, making **bradycardia** a more sensitive and earlier indicator for clinical monitoring. *Cessation of breathing for more than 20 seconds* - This is the **primary defining feature** of apnea of prematurity itself. - However, the question asks for the most important **associated finding** rather than the definition, making **bradycardia** the key clinical parameter that determines the severity and need for intervention.

Question 962: Community-acquired neonatal pneumonia: What is the treatment of choice?

A. Ampicillin + Chloramphenicol
B. Ampicillin + Gentamicin (Correct Answer)
C. Metronidazole + Amikacin
D. Cefotaxime + Amikacin

Explanation: ***Ampicillin + Gentamicin*** - This combination is the recommended empirical treatment for **neonatal sepsis** and pneumonia, effectively covering common causative organisms like **Group B Streptococcus** (GBS) and **E. coli**. - **Ampicillin** targets gram-positive bacteria, while **gentamicin** (an aminoglycoside) provides broad-spectrum coverage for gram-negative bacteria, acting synergistically. *Ampicillin + Chloramphenicol* - While ampicillin covers common neonatal pathogens, **chloramphenicol** is generally avoided in neonates due to the risk of **Gray Baby Syndrome**. - Its use is reserved for specific, severe infections where other effective and safer alternatives are not available. *Metronidazole + Amikacin* - **Metronidazole** is primarily effective against anaerobic bacteria and parasites, which are not typical primary causes of community-acquired neonatal pneumonia. - **Amikacin** is an aminoglycoside similar to gentamicin but is generally reserved for infections resistant to other aminoglycosides. *Cefotaxime + Amikacin* - **Cefotaxime** (a third-generation cephalosporin) is an excellent choice for neonatal sepsis and meningitis, covering a broad spectrum of bacteria. - However, in community-acquired neonatal pneumonia, the combination with **ampicillin and gentamicin** is often preferred as a first-line empirical therapy, with cefotaxime reserved for specific indications or resistance patterns.

Question 963: Which of the following is NOT an essential criterion for diagnosing perinatal asphyxia?

A. Prolonged metabolic alkalosis (Correct Answer)
B. Hypoxic ischemic encephalopathy (HIE) in the immediate neonatal period
C. Evidence of multiorgan dysfunction in the immediate neonatal period
D. Persistence of Apgar score of 0-3 for >5 min

Explanation: ***Prolonged metabolic alkalosis*** - This is **NOT** an essential criterion for diagnosing perinatal asphyxia because asphyxia causes the opposite condition — **metabolic acidosis**, not alkalosis. - During oxygen deprivation, anaerobic metabolism produces lactic acid, leading to **acidosis** (low pH, high lactate). - **Metabolic alkalosis** (excess bicarbonate or loss of acids) is incompatible with the hypoxic-ischemic insult of asphyxia. *Persistence of Apgar score of 0-3 for >5 min* - A **persistently low Apgar score** (0-3 for more than 5 minutes) is a strong indicator of perinatal asphyxia and is one of the **essential criteria**. - It reflects severe cardiorespiratory depression and the infant's inability to establish effective breathing and circulation. *Hypoxic ischemic encephalopathy (HIE) in the immediate neonatal period* - The development of **HIE** is a direct and severe consequence of perinatal asphyxia, signifying brain damage due to lack of oxygen and blood flow. - This is a **critical diagnostic criterion**, as it indicates significant neurological impact from the asphyxial event. *Evidence of multiorgan dysfunction in the immediate neonatal period* - Asphyxia can lead to widespread tissue damage due to oxygen deprivation, affecting organs like the kidneys, heart, lungs, and liver, in addition to the brain. - **Multiorgan dysfunction** is a **key essential criterion** that supports the diagnosis of severe perinatal asphyxia.

Question 964: What characterizes a term small for date baby?

A. Absence of nipple nodule
B. Absence of palmar/plantar creases
C. Presence of hyperbilirubinemia
D. Weight less than the 10th percentile (Correct Answer)

Explanation: ***Weight less than the 10th percentile*** - A small for date (SFD) baby is primarily defined by a **birth weight below the 10th percentile** for gestational age, reflecting intrauterine growth restriction. - This definition focuses on the infant's size **relative to expected growth norms**, rather than specific developmental features. *Absence of nipple nodule* - The absence of a **nipple nodule** is characteristic of a **premature neonate**, not specifically a small for date baby. - While SFD babies can be premature, this finding indicates immaturity rather than poor growth for their gestational age. *Absence of palmar/plantar creases* - The lack of prominent **palmar and plantar creases** is another sign of **prematurity**, as these creases develop progressively with increasing gestational age. - This feature helps assess neurological maturity but doesn't define low birth weight for gestational age. *Presence of hyperbilirubinemia* - **Hyperbilirubinemia** (jaundice) is a common finding in **neonates** of various gestational ages and weights, due to immature liver function. - It is not a defining characteristic of a small for date baby; rather, it indicates a physiological or pathological process independent of growth restriction.

Question 965: Which one of the following statements about transient tachypnea of the newborn (TTNB) is correct?

A. Onset of respiratory distress is immediately after birth and it rarely lasts beyond 48 hours (Correct Answer)
B. It is the commonest respiratory disorder in newborns.
C. It is usually self-limiting and resolves within 72 hours.
D. It can be associated with other respiratory conditions.

Explanation: ***Onset of respiratory distress is immediately after birth and it rarely lasts beyond 48 hours*** - TTNB typically presents with **respiratory distress** symptoms shortly **after birth**, specifically within the first few hours (often within 2-6 hours). - The condition is usually transient, with the **majority of cases resolving within 24-48 hours** as excess fetal lung fluid is cleared. - This statement is **most accurate** as it captures both the timing of onset and the typical duration. *It is the commonest respiratory disorder in newborns* - **Respiratory distress syndrome (RDS)** due to surfactant deficiency is more common in **premature infants**. - While TTNB is a common cause of respiratory distress, particularly in **term and near-term infants** delivered by cesarean section, it is **not the single most common** respiratory disorder across all newborns. *It is usually self-limiting and resolves within 72 hours* - While this statement is **technically true** (TTNB can persist up to 72 hours), it is **less precise** than the correct answer. - The key distinction is that TTNB **rarely lasts beyond 48 hours**, with most cases resolving much sooner. - Respiratory distress persisting beyond 72 hours should prompt investigation for **other diagnoses**. *It can be associated with other respiratory conditions* - TTNB is a **distinct diagnosis** caused by delayed clearance of fetal lung fluid. - It is typically a **diagnosis of exclusion** and is **not primarily associated with other respiratory co-morbidities**. - If other respiratory conditions are present, the diagnosis would likely be more complex than simple TTNB.

Question 966: Cord red blood cells from an infant suspected of having hemolytic disease of the newborn are most likely to be tested by which of the following?

A. Hemagglutination inhibition test
B. Nephelometry
C. Direct Coombs test (Correct Answer)
D. Passive hemagglutination test

Explanation: ***Direct coombs test*** - The **direct Coombs test** is utilized to detect antibodies attached to the surface of red blood cells (RBCs), which is a key factor in diagnosing **hemolytic disease of the newborn** [1]. - It specifically identifies **autoantibodies** or **alloantibodies** causing hemolysis in infants due to maternal-fetal blood group incompatibility. *Nephelometry* - Nephelometry is used for measuring **immunoglobulin levels** and not specific for detecting **antibodies on RBCs**. - It does not provide information about hemolysis or the specific conditions related to **hemolytic disease of the newborn**. *Hemagglutination inhibition test* - This test is primarily used for identifying **viral infections** and assessing antibody response rather than detecting antibodies on RBCs. - It is not relevant for diagnosing conditions like **hemolytic disease of the newborn**. *Passive hemagglutination test* - The passive hemagglutination test detects antigens or antibodies but does not specifically identify **coated RBCs** from hemolytic disease. - It is less specific and not the preferred method for determining the cause of **hemolysis in newborns**. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 603-604.

Question 967: A neonate developed yellow discoloration of the skin, sclera, and mucous membranes. Physiological icterus usually appears and regresses by which days?

A. Second day and fourth day
B. Third day and seventh day (Correct Answer)
C. Fourth day and eighth day
D. Fifth day and ninth day

Explanation: ***Third day and seventh day*** - **Physiological jaundice** typically becomes visible on the **second or third day** after birth (never within the first 24 hours). - It usually **peaks by day 3-5** and begins to decline by the **seventh day** in full-term neonates. - Complete resolution typically occurs by **7-10 days** (up to 2 weeks in breastfed infants), but day 7 represents the **typical beginning of resolution** for most term neonates. - This is the **classic teaching timeline** for physiological jaundice. *Second day and fourth day* - While jaundice can appear on the second day, **resolution by the fourth day** is too early for typical physiological jaundice. - Physiological icterus typically **peaks around day 3-5**, not resolves by day 4. *Fourth day and eighth day* - The **onset on the fourth day** is slightly delayed for typical physiological jaundice, which usually appears by day 2-3. - While resolution by the eighth day is acceptable, the **delayed onset** makes this less characteristic of classic physiological jaundice. *Fifth day and ninth day* - Both the **onset on the fifth day** and resolution on the ninth day are generally considered **delayed** for uncomplicated physiological jaundice. - Jaundice appearing on day 5 or later should raise suspicion for **pathological causes** (hemolysis, infection, metabolic disorders).

Question 968: Which of the following is a common benign condition characterized by white/yellow keratin-filled cysts on a newborn's skin?

A. Mongolian spots
B. Milia (Correct Answer)
C. Epstein pearls
D. Congenital melanoma

Explanation: ***Milia*** - These are **tiny, white bumps** (1-2mm) that appear on a newborn's nose, chin, or cheeks - Caused by **trapped keratin beneath the skin surface** in immature sebaceous glands - Occur in **40-50% of newborns** and are completely benign - Resolve spontaneously within **2-4 weeks** without treatment *Mongolian spots* - These are **blue-gray flat birthmarks** (not cysts) caused by dermal melanocytosis - Most commonly found on the **lumbosacral area and buttocks** - Very common in Asian, African, and Hispanic populations but are **pigmentary lesions**, not keratin cysts - Not the answer as they are not characterized by white/yellow cysts *Epstein pearls* - These are **small whitish-yellow cysts** on the **palate** (roof of mouth), not on skin - Found in **60-85% of newborns** and are epithelial inclusion cysts - While very common and benign, they occur on the **oral mucosa**, not the skin surface - Not the answer as the question specifies skin *Congenital melanoma* - This is an **extremely rare malignant tumor**, not a benign condition - Represents a **serious cancer** requiring immediate treatment - Not the answer as it is neither common nor benign

Question 969: Which of the following features is associated with Potter's syndrome?

A. Renal anomalies
B. Severe oligohydramnios
C. Flattened nose
D. All of the options (Correct Answer)

Explanation: ***All of the options*** Potter's syndrome (Potter sequence) is characterized by a constellation of features resulting from **severe oligohydramnios**, typically due to **bilateral renal agenesis or other severe renal anomalies**. **Why all three features are associated with Potter's syndrome:** **Renal anomalies** - **Bilateral renal agenesis** is the classic underlying cause of Potter's syndrome - Other renal anomalies (multicystic dysplastic kidneys, posterior urethral valves) can also cause the sequence - Absent or severely impaired renal function leads to decreased fetal urine production **Severe oligohydramnios** - Results from **lack of fetal urine production** due to renal anomalies - Amniotic fluid is primarily composed of fetal urine in the second and third trimesters - The severe oligohydramnios is the critical factor that leads to the physical deformities **Flattened nose** - Classic facial feature resulting from **mechanical compression** in utero due to lack of amniotic fluid cushioning - Part of the characteristic "Potter facies" which also includes low-set ears, prominent epicanthal folds, and micrognathia - These facial features develop due to prolonged compression against the uterine wall **Additional key features** of Potter's syndrome include pulmonary hypoplasia (the most life-threatening complication) and limb abnormalities (clubfeet, limb contractures).

Question 970: Which of the following conditions is most commonly associated with neonatal hypoglycemia?

A. Infants born to diabetic mothers (Correct Answer)
B. Infants with low birth weight
C. Infants born to mothers with toxaemia of pregnancy
D. Premature infants

Explanation: ***Infants born to diabetic mothers*** - Maternal hyperglycemia leads to fetal **hyperinsulinism**, which continues after birth when the glucose supply from the mother is interrupted. - This persistent hyperinsulinism rapidly consumes the available glucose in the neonate, leading to profound and often symptomatic **hypoglycemia**. - This is the **most common** association with neonatal hypoglycemia encountered in clinical practice. *Infants with low birth weight* - While **low birth weight (LBW)** infants are at increased risk for hypoglycemia due to limited glycogen stores and impaired gluconeogenesis, it is not the most common association compared to infants of diabetic mothers. - Their hypoglycemia tends to be due to limited metabolic reserves, whereas in infants of diabetic mothers, it's driven by **insulin excess**. *Infants born to mothers with toxaemia of pregnancy* - **Toxemia of pregnancy** (pre-eclampsia/eclampsia) is not directly associated with an increased risk of neonatal hypoglycemia. - However, severe pre-eclampsia can lead to **intrauterine growth restriction (IUGR)** and prematurity, which are indirect risk factors for hypoglycemia due to poor glycogen stores. *Premature infants* - **Premature infants** are at risk for hypoglycemia due to inadequate glycogen stores, immature enzyme systems for gluconeogenesis, and increased metabolic demands. - However, the incidence and severity are less compared to infants of diabetic mothers, where the mechanism involves **active hyperinsulinism** rather than just inadequate reserves.

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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