Neonatology Practice Questions

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

Prolonged metabolic alkalosis. ***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.

Q: What characterizes a term small for date baby?

Weight less than the 10th percentile. ***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.

Q: The newborn heart rate is about what?

120 - 160 /min. ***120 - 160 /min*** - A healthy newborn's heart rate typically ranges between **120 and 160 beats per minute** while awake and calm. - This elevated rate is necessary to meet the **metabolic demands** of rapid growth and development. *160 - 180 /min* - While a newborn's heart rate can temporarily increase into this range during periods of **crying, agitation, or fever**, it is not the typical resting rate. - A persistent heart rate in this range without apparent cause could indicate **tachycardia** or other underlying issues. *180 - 200 /min* - This range is generally considered **tachycardic** for a newborn and warrants further investigation for potential medical conditions such as **supraventricular tachycardia (SVT)**, fever, or infection. - It is not a normal physiological heart rate for a healthy, resting newborn. *200 - 220 /min* - A heart rate consistently within this very high range is indicative of **severe tachycardia** and is a medical emergency in a newborn. - It suggests significant stress, illness, or a cardiac arrhythmia requiring immediate medical attention.

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

Third day and seventh day. ***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).

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

Milia. ***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

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

All of the options. ***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).

Q: During delayed cord clamping, how much blood is typically transferred to the neonate?

50-100 mL. ***50-100 mL*** - **Delayed cord clamping (DCC)** allows for the transfer of a significant volume of **placental blood** back to the neonate. - This typically results in an increase of approximately **50-100 mL** of blood volume in the infant, contributing to improved iron stores and hematocrit levels. *120-150 mL* - This volume is generally **higher than the average transfer** seen with standard delayed cord clamping, though individual variations can occur. - While beneficial, such a large transfer might only occur with **prolonged clamping times** or specific neonatal interventions. *150-180 mL* - This range represents a **substantially larger volume** than what is typically transferred during routine delayed cord clamping. - This volume is **uncommon** and might lead to concerns like **polycythemia** if it occurred. *100-200 mL* - While the lower end of this range (100 mL) can sometimes be achieved, 200 mL is generally **considered excessive** for typical delayed cord clamping. - Such a large volume could contribute to **hyperbilirubinemia** and **polycythemia** in the neonate.

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

Infants born to diabetic mothers. ***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.

Q: What is the most common cause of seizure in a newborn?

Hypoxic-ischemic encephalopathy. ***Hypoxic-ischemic encephalopathy*** - This is the **most frequent etiology** of neonatal seizures, particularly in **full-term infants**, due to perinatal events leading to brain injury. - Seizures often manifest within the **first 24-48 hours** of life and can range from subtle to generalized tonic-clonic. *Hypocalcemia* - While a notable cause, **hypocalcemia** is less common than hypoxic-ischemic encephalopathy as the primary cause of neonatal seizures. - Seizures due to hypocalcemia typically appear later, often around **3-7 days of life**, and can be accompanied by jitteriness and apneic spells. *Metabolic abnormality* - Various **inborn errors of metabolism** can cause neonatal seizures, but collectively they are less common than hypoxic-ischemic encephalopathy. - These seizures may be accompanied by other systemic symptoms like **lethargy, feeding difficulties, and organ dysfunction**. *Sepsis* - **Neonatal sepsis** can lead to seizures, often as a complication of central nervous system infection (meningitis) or metabolic derangements. - While serious, sepsis is proportionally **less common** as the sole primary cause compared to hypoxic-ischemic encephalopathy.

Q: A newborn is noted to be jaundiced within the first 24 hours of life. What is the most likely cause of this neonatal jaundice?

Hemolytic disease of the newborn. ***Hemolytic disease of the newborn*** - Jaundice appearing within the first **24 hours of life** is considered pathological and strongly suggests a hemolytic process. - This is often caused by **ABO or Rh incompatibility**, leading to rapid breakdown of red blood cells and increased bilirubin production. *Breast milk jaundice* - Typically presents **after the first 3-5 days** of life and can persist for several weeks. - It is often associated with factors in breast milk that interfere with bilirubin conjugation or excretion. *Physiological jaundice* - Usually appears **after 24 hours of life**, peaking around day 3-5 in term infants. - It results from the normal delay in bilirubin conjugation by an immature liver combined with increased red blood cell turnover. *Gilbert’s syndrome* - An inherited condition causing **intermittent, mild unconjugated hyperbilirubinemia**, typically triggered by stress, fasting, or illness. - While it can manifest at any age, significant jaundice in the first 24 hours of a newborn's life is highly unlikely to be due to Gilbert's syndrome alone and would not cause the rapid onset seen here.

Question 1

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

Accepted Answer

Prolonged metabolic alkalosis

Answer

Hypoxic ischemic encephalopathy (HIE) in the immediate neonatal period

Answer

Evidence of multiorgan dysfunction in the immediate neonatal period

Answer

Persistence of Apgar score of 0-3 for >5 min

Question 2

What characterizes a term small for date baby?

Accepted Answer

Weight less than the 10th percentile

Answer

Absence of nipple nodule

Answer

Absence of palmar/plantar creases

Answer

Presence of hyperbilirubinemia

Question 3

The newborn heart rate is about what?

Accepted Answer

120 - 160 /min

Answer

160 - 180 /min

Answer

180 - 200 /min

Answer

200 - 220 /min

Question 4

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

Accepted Answer

Third day and seventh day

Answer

Second day and fourth day

Answer

Fourth day and eighth day

Answer

Fifth day and ninth day

Question 5

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

Accepted Answer

Milia

Answer

Mongolian spots

Answer

Epstein pearls

Answer

Congenital melanoma

Question 6

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

Accepted Answer

All of the options

Answer

Renal anomalies

Answer

Severe oligohydramnios

Answer

Flattened nose

Question 7

During delayed cord clamping, how much blood is typically transferred to the neonate?

Accepted Answer

50-100 mL

Answer

120-150 mL

Answer

150-180 mL

Answer

100-200 mL

Question 8

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

Accepted Answer

Infants born to diabetic mothers

Answer

Infants with low birth weight

Answer

Infants born to mothers with toxaemia of pregnancy

Answer

Premature infants

Question 9

What is the most common cause of seizure in a newborn?

Accepted Answer

Hypoxic-ischemic encephalopathy

Answer

Hypocalcemia

Answer

Metabolic abnormality

Answer

Sepsis

Question 10

A newborn is noted to be jaundiced within the first 24 hours of life. What is the most likely cause of this neonatal jaundice?

Accepted Answer

Hemolytic disease of the newborn

Answer

Breast milk jaundice

Answer

Physiological jaundice

Answer

Gilbert’s syndrome

Neonatology — MCQs

Neonatology — MCQs

On this page

Practice by Chapter

Want unlimited practice?