Neonatology Practice Questions

Q: Two weeks after birth, a neonate develops sepsis, skin vesicles, and conjunctivitis. Over the next several days, the baby's condition deteriorates with the development of seizures, cranial nerve palsies, and lethargy. The baby dies approximately one week after the onset of symptoms. Which of the following infectious agents would most likely cause this clinical presentation?

Herpes simplex. **Explanation:** The clinical presentation described is classic for **Neonatal Herpes Simplex Virus (HSV)** infection, specifically the **Disseminated** and **Central Nervous System (CNS)** forms. **Why Herpes Simplex is Correct:** Neonatal HSV typically presents in the 1st to 3rd week of life (unlike other TORCH infections which are often present at birth). The triad of **skin vesicles, conjunctivitis, and sepsis-like symptoms** is highly suggestive. The progression to **seizures, lethargy, and cranial nerve palsies** indicates encephalitis. HSV-2 (acquired during vaginal delivery) is the most common cause. Without prompt acyclovir therapy, the mortality rate for disseminated HSV exceeds 80%. **Why Other Options are Incorrect:** * **Cytomegalovirus (CMV):** Usually presents at birth with microcephaly, periventricular calcifications, and a "blueberry muffin" rash. It does not typically present with acute postnatal sepsis and vesicles. * **Rubella:** Congenital Rubella Syndrome presents at birth with the triad of cataracts, sensorineural deafness, and congenital heart disease (PDA). It does not cause acute vesicular eruptions or rapid neurological deterioration in the second week. * **Syphilis:** Early congenital syphilis presents with snuffles (rhinitis), hepatosplenomegaly, and a desquamating maculopapular rash (palms/soles), not vesicles and acute encephalitis. **High-Yield NEET-PG Pearls:** * **Classification:** Neonatal HSV is divided into three patterns: (1) SEM (Skin, Eye, Mouth), (2) CNS disease, and (3) Disseminated disease. * **Timing:** Symptoms appearing at **2 weeks** of life are a major clue for HSV; most other TORCH infections are apparent in the first 48 hours. * **Diagnosis:** PCR of CSF or vesicle fluid is the gold standard. * **Treatment:** High-dose intravenous **Acyclovir** (20 mg/kg every 8 hours) for 14–21 days.

Q: Which of the following is NOT useful in the management of meconium aspiration syndrome?

Corticosteroids. **Explanation:** **Meconium Aspiration Syndrome (MAS)** occurs when a neonate inhales meconium-stained amniotic fluid, leading to airway obstruction, chemical pneumonitis, and surfactant inactivation. **Why Corticosteroids are NOT useful:** While MAS involves significant pulmonary inflammation (chemical pneumonitis), multiple randomized controlled trials and Cochrane reviews have shown that **corticosteroids** (systemic or inhaled) do not provide a clinical benefit. They do not reduce the duration of hospitalization, the need for mechanical ventilation, or the incidence of oxygen dependency. In some cases, they may even increase the risk of secondary infections. **Analysis of Incorrect Options:** * **Oxygen (A):** Essential to maintain adequate systemic oxygenation and prevent pulmonary vasoconstriction, which can lead to Persistent Pulmonary Hypertension of the Newborn (PPHN). * **Ventilatory Support (B):** Many MAS cases involve severe respiratory failure or V/Q mismatch. Modalities like CPAP, conventional mechanical ventilation, or High-Frequency Oscillatory Ventilation (HFOV) are mainstays of management. * **Antibiotics (D):** Although MAS is a chemical inflammation, it is often difficult to distinguish from bacterial pneumonia radiologically. Therefore, broad-spectrum antibiotics (e.g., Ampicillin and Gentamicin) are routinely started until blood cultures are negative. **Clinical Pearls for NEET-PG:** * **Surfactant Therapy:** Useful in MAS because meconium inactivates endogenous surfactant. * **Inhaled Nitric Oxide (iNO):** The treatment of choice if MAS is complicated by PPHN. * **Chest X-ray findings:** Characterized by "patchy opacities," hyperinflation, and flattening of the diaphragm. * **Prevention:** Routine intrapartum or post-delivery suctioning of "vigorous" or "non-vigorous" infants is **no longer recommended** to prevent MAS. Management focuses on standard resuscitation (NRP guidelines).

Q: A baby is considered large for gestational age (LGA) if their birth weight is:

>90th percentile for the gestational age. **Explanation:** **1. Why Option A is Correct:** The classification of birth weight is based on **intrauterine growth curves** (such as the Lubchenco or Fenton charts) which plot weight against gestational age. A neonate is defined as **Large for Gestational Age (LGA)** when their birth weight is **>90th percentile** for their specific gestational age. This definition is relative, meaning a preterm baby can be LGA even if their absolute weight is low, provided it exceeds the 90th percentile for that week of pregnancy. **2. Why Other Options are Incorrect:** * **Option B (>50th percentile):** This represents the median or "average" weight for gestational age. Infants between the 10th and 90th percentiles are classified as **Appropriate for Gestational Age (AGA)**. * **Options C & D (>3 kg or >3.5 kg):** These are absolute weight values. Classification of LGA/SGA must always be adjusted for **gestational age**. For example, a 3.5 kg baby born at 42 weeks (post-term) might be AGA, whereas the same weight at 34 weeks would be significantly LGA. **3. Clinical Pearls for NEET-PG:** * **Macrosomia vs. LGA:** Macrosomia is an absolute term usually defined as a birth weight **>4000g or >4500g**, regardless of gestational age. * **Common Etiology:** The most high-yield cause of LGA is **Maternal Diabetes Mellitus** (due to fetal hyperinsulinism). Other causes include Beckwith-Wiedemann Syndrome and Sotos Syndrome. * **Complications to Watch:** LGA infants are at high risk for **birth trauma** (shoulder dystocia, Erb’s palsy), **hypoglycemia**, polycythemia, and hyperbilirubinemia. * **SGA Definition:** Small for Gestational Age is defined as birth weight **<10th percentile**.

Q: A syndrome of multiple congenital anomalies including microcephaly, cardiac anomalies, and growth retardation has been described in children of women who are heavy users of which substance?

Ethyl alcohol. The question describes the classic presentation of **Fetal Alcohol Syndrome (FAS)**, which occurs due to the teratogenic effects of maternal ethyl alcohol consumption during pregnancy. ### **Explanation of the Correct Answer** **Ethyl alcohol** is a potent teratogen that crosses the placenta. It interferes with cellular proliferation and migration, particularly in the central nervous system. The hallmark features of FAS include: * **Growth Retardation:** Both prenatal and postnatal growth deficiency. * **CNS Abnormalities:** Microcephaly, intellectual disability, and behavioral issues. * **Facial Dysmorphism:** Smooth philtrum, thin upper lip (vermilion border), and short palpebral fissures. * **Cardiac Anomalies:** Most commonly Ventricular Septal Defects (VSD) and Atrial Septal Defects (ASD). ### **Why Other Options are Incorrect** * **Amphetamines:** Associated with placental abruption, preterm birth, and low birth weight, but do not typically cause a specific syndrome of dysmorphic features. * **Barbiturates:** Chronic use can lead to neonatal withdrawal symptoms (irritability, tremors) and a slightly increased risk of cleft lip/palate, but not the triad of microcephaly and cardiac defects seen in FAS. * **Heroin:** Primarily associated with **Neonatal Abstinence Syndrome (NAS)**, characterized by high-pitched crying, tremors, and seizures. It causes growth restriction but is not typically linked to structural congenital malformations. ### **NEET-PG High-Yield Pearls** * **Most common preventable cause** of intellectual disability is Fetal Alcohol Syndrome. * **Critical Period:** Alcohol exposure in the first trimester affects organogenesis (structural), while third-trimester exposure primarily affects growth and brain development. * **Key Facial Triad:** Short palpebral fissures, smooth philtrum, and thin upper lip.

Q: A term newborn infant is noticed to be hypotonic. Which of the following is a possible diagnosis?

Galactosaemia. **Explanation:** Hypotonia in a newborn (the "floppy infant") can result from central nervous system (CNS) dysfunction, peripheral neuromuscular disorders, or systemic metabolic derangements. **Why Galactosaemia is correct:** Galactosaemia is an autosomal recessive metabolic disorder caused by a deficiency of the enzyme **Galactose-1-phosphate uridyltransferase (GALT)**. When an affected infant begins breastfeeding or taking cow’s milk formula, toxic metabolites (galactose-1-phosphate) accumulate. This leads to a systemic illness characterized by jaundice, hepatomegaly, vomiting, hypoglycemia, and **profound hypotonia** due to metabolic encephalopathy and sepsis (commonly *E. coli*). **Analysis of Incorrect Options:** * **Turner’s Syndrome (45, XO):** While associated with lymphedema of hands/feet and webbed neck in neonates, it does not typically present with significant neonatal hypotonia. * **Kugelberg-Welander Disease (SMA Type III):** This is a juvenile-onset form of Spinal Muscular Atrophy. While SMA Type I (Werdnig-Hoffmann) causes severe neonatal hypotonia, Type III presents much later in childhood (after age 2) with proximal muscle weakness. * **Cephalhaematoma:** This is a subperiosteal hemorrhage that does not cross suture lines. It is a localized birth injury and does not cause systemic hypotonia unless there is massive blood loss leading to shock (which is rare). **Clinical Pearls for NEET-PG:** * **Most common cause of neonatal hypotonia:** Central (Brain) causes, such as Hypoxic-Ischemic Encephalopathy (HIE). * **Metabolic Clue:** If a floppy infant has cataracts and hepatomegaly, suspect **Galactosaemia**. * **Genetic Clue:** The most common genetic cause of neonatal hypotonia is **Prader-Willi Syndrome**. * **Neuromuscular Clue:** If the infant is alert but floppy with absent deep tendon reflexes, suspect **Werdnig-Hoffmann Disease**.

Q: A neonate presents with frothy sputum in the mouth on the third day of life and coughing during feeding. What is the most likely diagnosis?

Tracheoesophageal fistula. ### Explanation **Correct Option: A. Tracheoesophageal Fistula (TEF)** The clinical presentation of **frothy secretions** (excessive salivation) and **coughing/choking during feeding** is the classic triad of Tracheoesophageal Fistula with Esophageal Atresia (EA). * **Mechanism:** In EA, the blind proximal esophageal pouch fills with saliva, which then overflows into the trachea or spills out of the mouth as frothy bubbles. When feeding is attempted, the milk has no path to the stomach, leading to immediate regurgitation and aspiration, causing coughing and cyanosis (the "3 Cs": Coughing, Choking, and Cyanosis). **Why other options are incorrect:** * **B. Choanal Atresia:** This presents with respiratory distress that **improves with crying** and worsens during feeding (as the neonate is an obligate nasal breather). It does not typically cause frothy sputum. * **C. Cleft Palate:** While it causes feeding difficulties and nasal regurgitation, it does not present with the characteristic "frothing" at the mouth seen in EA/TEF. * **D. Diaphragmatic Hernia:** Presents with a **scaphoid abdomen**, shifted heart sounds, and severe respiratory distress immediately after birth, rather than frothing and feeding-related coughing. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Type:** Type C (85%) – Proximal Esophageal Atresia with Distal TEF. * **Initial Diagnostic Step:** Inability to pass a stiff, radio-opaque **nasogastric tube** (it coiling in the upper pouch on X-ray). * **Associated Anomalies:** Look for **VACTERL** association (Vertebral, Anal, Cardiac, TEF, Renal, and Limb defects). * **Antenatal Clue:** Maternal polyhydramnios and an absent fetal stomach bubble on ultrasound.

Q: Which of the following complications can occur as a result of passage of meconium in utero?

Obstructive emphysema. **Explanation:** The passage of meconium in utero, often triggered by fetal distress or hypoxia, can lead to **Meconium Aspiration Syndrome (MAS)**. **Why Option A is Correct:** When a neonate aspirates meconium-stained amniotic fluid, the thick, particulate matter reaches the distal airways. This results in a **"ball-valve" effect**: meconium allows air to enter during inspiration (when airways dilate) but obstructs air exit during expiration (when airways narrow). This leads to air trapping and **obstructive emphysema**. If the obstruction is complete, it leads to atelectasis; if partial, it leads to hyperinflation and potential air-leak syndromes like pneumothorax. **Why the Other Options are Incorrect:** * **B. Meconium ileus:** This is a primary intestinal obstruction caused by inspissated meconium in the terminal ileum, most commonly associated with **Cystic Fibrosis**. It is not caused by the passage of meconium into the amniotic fluid. * **C. Neonatal hepatitis:** This is a clinical syndrome of prolonged neonatal jaundice caused by various infectious, metabolic, or idiopathic factors. It has no pathophysiological link to meconium aspiration. * **D. Intrauterine growth restriction (IUGR):** While IUGR may be a *predisposing factor* for fetal distress (which leads to meconium passage), it is not a *complication* of meconium passage itself. **High-Yield Clinical Pearls for NEET-PG:** * **Chest X-ray findings in MAS:** Characteristic "patchy opacities" (atelectasis) alternating with areas of "hyperinflation" (emphysema). * **Chemical Pneumonitis:** Meconium is sterile but highly irritating, causing inflammation and surfactant inactivation. * **PPHN:** Persistent Pulmonary Hypertension of the Newborn is a severe, frequent complication of MAS. * **Management:** Routine intrapartum suctioning on the perineum is no longer recommended. Management focuses on respiratory support and surfactant therapy.

Q: A neonate passes black colored meconium after 12 hours of birth. What is the true statement regarding this observation?

Normal finding. **Explanation:** **1. Why "Normal finding" is correct:** Meconium is the first stool passed by a newborn. It is typically **dark green to black** in color, odorless, and has a sticky, tar-like consistency. It is composed of ingested amniotic fluid, mucus, lanugo, bile, and epithelial cells. * **Timing:** 99% of full-term healthy neonates pass meconium within the first **24 to 48 hours** of life. Passing black meconium at 12 hours is a perfectly physiological and healthy observation. **2. Why other options are incorrect:** * **Intestinal hemorrhage:** While blood can turn stool black (melena), in a 12-hour-old neonate, black sticky stool is the expected appearance of meconium, not a sign of pathology. * **Fibrocystic disease of pancreas (Cystic Fibrosis):** This condition is associated with **Meconium Ileus**, where the meconium is abnormally thick and sticky, leading to intestinal obstruction and a **failure/delay** in passing stool (>48 hours), rather than normal passage at 12 hours. * **Hirschsprung's disease:** This is characterized by a **delay** in passing meconium (usually >48 hours) due to the absence of ganglion cells in the distal colon. Early passage at 12 hours effectively rules this out. **Clinical Pearls for NEET-PG:** * **Delayed Meconium (>48 hrs):** Think of Hirschsprung’s disease, Meconium Ileus (Cystic Fibrosis), Anorectal malformations, or Hypothyroidism. * **Transition Stools:** By day 3–4, stool changes from black-green to greenish-brown. * **Breastfed Stools:** Usually appear by day 5; they are golden yellow, mustard-like, and non-offensive. * **Apt Test:** Used to differentiate swallowed maternal blood from neonatal gastrointestinal GI bleeding.

Q: A 32-week pregnant multigravida is diagnosed with gestational diabetes based on an abnormal glucose tolerance test. Which of the following is NOT a potential complication in the newborn?

Hyperglycemia. The correct answer is **B. Hyperglycemia**. ### **Explanation of the Correct Answer** The pathophysiology of an Infant of a Diabetic Mother (IDM) is governed by the **Pedersen Hypothesis**. Maternal hyperglycemia leads to fetal hyperglycemia because glucose crosses the placenta. In response, the fetal pancreas undergoes islet cell hyperplasia and secretes excess insulin (fetal hyperinsulinism). After birth, the high glucose supply from the mother is abruptly cut off, but the newborn’s insulin levels remain high. This results in **hypoglycemia**, not hyperglycemia. Therefore, hyperglycemia is not a complication seen in these neonates. ### **Analysis of Incorrect Options** * **A. Hyperbilirubinemia:** IDMs often have polycythemia (due to increased erythropoietin from fetal hypoxia). The breakdown of excess red blood cells leads to increased indirect bilirubin levels. * **C. Hypocalcemia:** This occurs due to a delay in the physiological rise of parathyroid hormone (PTH) after birth and is often associated with maternal-fetal magnesium imbalances. * **D. Hypomagnesemia:** Maternal diabetes often leads to maternal magnesium loss through urine, resulting in fetal magnesium deficiency. This, in turn, suppresses PTH secretion, worsening hypocalcemia. ### **NEET-PG High-Yield Pearls** * **Most common anomaly:** Hypertrophic Cardiomyopathy (specifically asymmetric septal hypertrophy). * **Most specific anomaly:** Caudal Regression Syndrome (Sacral Agenesis). * **Most common malformation:** Congenital Heart Disease (specifically VSD and Transposition of Great Arteries). * **Other complications:** Respiratory Distress Syndrome (insulin inhibits surfactant production), Polycythemia, and Renal Vein Thrombosis.

Question 1

Two weeks after birth, a neonate develops sepsis, skin vesicles, and conjunctivitis. Over the next several days, the baby's condition deteriorates with the development of seizures, cranial nerve palsies, and lethargy. The baby dies approximately one week after the onset of symptoms. Which of the following infectious agents would most likely cause this clinical presentation?

Accepted Answer

Herpes simplex

Answer

Cytomegalovirus

Answer

Rubella

Answer

Syphilis

Question 2

Which of the following is NOT useful in the management of meconium aspiration syndrome?

Accepted Answer

Corticosteroids

Answer

Oxygen

Answer

Ventilatory support

Answer

Antibiotics

Question 3

A baby is considered large for gestational age (LGA) if their birth weight is:

Accepted Answer

>90th percentile for the gestational age

Answer

>50th percentile for gestational age

Answer

>3 kg

Answer

>3.5 kg

Question 4

A syndrome of multiple congenital anomalies including microcephaly, cardiac anomalies, and growth retardation has been described in children of women who are heavy users of which substance?

Accepted Answer

Ethyl alcohol

Answer

Amphetamines

Answer

Barbiturates

Answer

Heroin

Question 5

A term newborn infant is noticed to be hypotonic. Which of the following is a possible diagnosis?

Accepted Answer

Galactosaemia

Answer

Turner's syndrome

Answer

Kugelberg Welander disease

Answer

Cephalhaematoma

Question 6

A neonate presents with frothy sputum in the mouth on the third day of life and coughing during feeding. What is the most likely diagnosis?

Accepted Answer

Tracheoesophageal fistula

Answer

Choanal atresia

Answer

Cleft palate

Answer

Diaphragmatic hernia

Question 7

Which of the following complications can occur as a result of passage of meconium in utero?

Accepted Answer

Obstructive emphysema

Answer

Meconium ileus

Answer

Neonatal hepatitis

Answer

Intrauterine growth restriction

Question 8

A neonate passes black colored meconium after 12 hours of birth. What is the true statement regarding this observation?

Accepted Answer

Normal finding

Answer

Intestinal hemorrhage

Answer

Fibrocystic disease of pancreas

Answer

Hirschsprung's disease

Question 9

A 32-week pregnant multigravida is diagnosed with gestational diabetes based on an abnormal glucose tolerance test. Which of the following is NOT a potential complication in the newborn?

Accepted Answer

Hyperglycemia

Answer

Hyperbilirubinemia

Answer

Hypocalcemia

Answer

Hypomagnesemia

Question 10

Which of the following statements is NOT true about Necrotizing Enterocolitis (NEC)?

Accepted Answer

The distal part of the colon is the most frequently involved segment.

Answer

The greatest risk factor for NEC is prematurity.

Answer

NEC may be seen in term infants.

Answer

Aggressive formula feeding may predispose to the development of NEC.

Neonatology — MCQs

Neonatology — MCQs

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