Neonatology Practice Questions

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 features is associated with Potter's syndrome?

Accepted Answer

All of the options

Answer

Renal anomalies

Answer

Severe oligohydramnios

Answer

Flattened nose

Question 2

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 3

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 4

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

Accepted Answer

Hypoxic-ischemic encephalopathy

Answer

Hypocalcemia

Answer

Metabolic abnormality

Answer

Sepsis

Question 5

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

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