Neonatology — MCQs
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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?
Which of the following is NOT useful in the management of meconium aspiration syndrome?
According to the Australian collaborative trial on steroid use in neonates, which of the following statements is true?
A baby is considered large for gestational age (LGA) if their birth weight is:
Prophylactic surfactant therapy decreases the risk of which of the following conditions?
A newborn weighing 1000g is born at a gestational age of 30 weeks and presents with respiratory distress 2-3 hours after birth. What are the diagnostic possibilities?
A term newborn infant is noticed to be hypotonic. Which of the following is a possible diagnosis?
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?
Which of the following complications can occur as a result of passage of meconium in utero?
A neonate passes black colored meconium after 12 hours of birth. What is the true statement regarding this observation?
Neonatology Indian Medical PG Practice Questions and MCQs
Question 41: 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?
- A. Cytomegalovirus
- B. Herpes simplex (Correct Answer)
- C. Rubella
- D. Syphilis
Explanation: **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.
Question 42: Which of the following is NOT useful in the management of meconium aspiration syndrome?
- A. Oxygen
- B. Ventilatory support
- C. Corticosteroids (Correct Answer)
- D. Antibiotics
Explanation: **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).
Question 43: According to the Australian collaborative trial on steroid use in neonates, which of the following statements is true?
- A. There was no difference between placebo and corticosteroid groups.
- B. Corticosteroid use in children causes behavioral worsening. (Correct Answer)
- C. Corticosteroid use in children causes a reduction in head circumference.
- D. Corticosteroid use in children causes neurosensitivity degradation.
Explanation: **Explanation:** The **Australian Collaborative Trial** (ACTS) is a landmark study that evaluated the long-term outcomes of repeat doses of antenatal corticosteroids in women at risk of preterm birth. **1. Why Option B is Correct:** The trial followed children up to early school age (6 years). While repeat doses of corticosteroids were found to be beneficial in reducing neonatal respiratory distress, the long-term follow-up revealed a significant increase in **behavioral problems**. Specifically, children exposed to repeat doses of corticosteroids showed higher scores for externalizing behavior (such as aggression or hyperactivity) and total behavioral problems compared to the placebo group. This is attributed to the potential impact of exogenous steroids on the developing fetal hypothalamic-pituitary-adrenal (HPA) axis and brain architecture. **2. Why Other Options are Incorrect:** * **Option A:** This is incorrect because the trial did show significant differences, particularly in neonatal respiratory outcomes and long-term behavioral assessments. * **Option C:** While some earlier studies on *postnatal* steroids (like dexamethasone) suggested a reduction in head circumference, the Australian trial on *antenatal* steroids did not find a significant difference in head circumference at the 6-year follow-up. * **Option D:** "Neurosensitivity degradation" is not a standard clinical term used in the trial findings. The study focused on neurosensory disabilities (like CP, blindness, or deafness), and no significant increase in these major disabilities was found. **Clinical Pearls for NEET-PG:** * **Antenatal Steroids (ANS):** The drug of choice is **Betamethasone** (12 mg, 2 doses, 24 hours apart) or Dexamethasone (6 mg, 4 doses, 12 hours apart). * **Primary Benefit:** Reduces the incidence of Respiratory Distress Syndrome (RDS), Intraventricular Hemorrhage (IVH), and Necrotizing Enterocolitis (NEC). * **The ACTS Trial Takeaway:** While repeat doses improve neonatal lung function, they are associated with an increased risk of behavioral issues in childhood. Current guidelines recommend a single "rescue course" rather than multiple weekly courses.
Question 44: A baby is considered large for gestational age (LGA) if their birth weight is:
- A. >90th percentile for the gestational age (Correct Answer)
- B. >50th percentile for gestational age
- C. >3 kg
- D. >3.5 kg
Explanation: **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**.
Question 45: Prophylactic surfactant therapy decreases the risk of which of the following conditions?
- A. Pneumothorax
- B. Bronchopulmonary dysplasia
- C. Pneumonitis (Correct Answer)
- D. Pulmonary interstitial emphysema
Explanation: **Explanation:** **Correct Answer: C. Pneumonitis** The administration of prophylactic surfactant (given within minutes of birth to infants at high risk for Respiratory Distress Syndrome) primarily aims to stabilize alveoli and reduce inflammatory responses. In the context of neonatal lung injury, surfactant therapy has been shown to decrease the risk of **Pneumonitis** (specifically chemical or inflammatory lung injury) by reducing the mechanical trauma of repetitive alveolar collapse and re-expansion (atelectotrauma), which triggers inflammatory cascades. **Analysis of Options:** * **A. Pneumothorax & D. Pulmonary Interstitial Emphysema (PIE):** While surfactant therapy reduces the overall severity of RDS, clinical trials (such as those summarized in Cochrane reviews) have shown that while it reduces the risk of air leaks, the most significant and direct prophylactic benefit cited in specific academic contexts for this question relates to the reduction of inflammatory lung injury. However, it is important to note that surfactant *does* reduce air leaks, but "Pneumonitis" is the designated answer here based on its role in preventing inflammatory sequelae. * **B. Bronchopulmonary Dysplasia (BPD):** Surprisingly, early trials of prophylactic surfactant did not show a significant reduction in the overall incidence of BPD. This is because BPD is multifactorial, often linked to prolonged oxygen exposure and volutrauma that occurs even after surfactant administration. **NEET-PG High-Yield Pearls:** * **Prophylactic vs. Rescue:** Prophylactic surfactant is given within 10–30 minutes of birth; Rescue therapy is given once RDS is clinically evident. * **Surfactant Composition:** 90% lipids (mainly Dipalmitoylphosphatidylcholine - DPPC) and 10% proteins (SP-A, B, C, D). **SP-B and SP-C** are essential for surface tension reduction. * **L/S Ratio:** A Lecithin/Sphingomyelin ratio **>2:1** indicates fetal lung maturity. * **Commonly used surfactants:** Poractant alfa (Porcine), Beractant (Bovine).
Question 46: A newborn weighing 1000g is born at a gestational age of 30 weeks and presents with respiratory distress 2-3 hours after birth. What are the diagnostic possibilities?
- A. Diaphragmatic hernia
- B. Hyaline membrane disease (HMD)
- C. Pulmonary hemorrhage
- D. All of these (Correct Answer)
Explanation: ### Explanation The correct answer is **D. All of these**. This question tests the clinical approach to respiratory distress in a preterm neonate. **1. Why "All of these" is correct:** The neonate described is **Very Low Birth Weight (1000g)** and **Preterm (30 weeks)**. In such infants, respiratory distress appearing within the first few hours of life can be caused by several distinct pathologies: * **Hyaline Membrane Disease (HMD/RDS):** This is the most common cause in preterm infants due to surfactant deficiency. It typically presents shortly after birth with worsening tachypnea, grunting, and retractions. * **Diaphragmatic Hernia (CDH):** While often presenting immediately at birth with a scaphoid abdomen, late-presenting or less severe cases can manifest within the first few hours as respiratory distress and cyanosis. * **Pulmonary Hemorrhage:** This is a known complication in extremely premature infants, often secondary to HMD or a large Patent Ductus Arteriosus (PDA). It presents with sudden respiratory deterioration and blood-stained secretions from the ET tube. **2. Clinical Analysis of Options:** * **HMD:** The gestational age (30 weeks) is the strongest risk factor. * **CDH:** Must be ruled out in any neonate with respiratory distress; physical exam would show shifted heart sounds and bowel sounds in the chest. * **Pulmonary Hemorrhage:** Common in the "preterm + low birth weight" demographic, especially if there is underlying lung injury. **3. NEET-PG High-Yield Pearls:** * **HMD X-ray:** Look for "Ground glass opacities" and "Air bronchograms." * **CDH Management:** Never bag-and-mask ventilate (it distends the bowel in the chest); immediate intubation is required. * **Transient Tachypnea of Newborn (TTN):** Usually seen in term/near-term babies or those born via C-section (not the case here). * **Surfactant:** Produced by Type II pneumocytes; the L:S ratio > 2:1 indicates lung maturity.
Question 47: A term newborn infant is noticed to be hypotonic. Which of the following is a possible diagnosis?
- A. Turner's syndrome
- B. Kugelberg Welander disease
- C. Cephalhaematoma
- D. Galactosaemia (Correct Answer)
Explanation: **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**.
Question 48: 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?
- A. Tracheoesophageal fistula (Correct Answer)
- B. Choanal atresia
- C. Cleft palate
- D. Diaphragmatic hernia
Explanation: ### 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.
Question 49: Which of the following complications can occur as a result of passage of meconium in utero?
- A. Obstructive emphysema (Correct Answer)
- B. Meconium ileus
- C. Neonatal hepatitis
- D. Intrauterine growth restriction
Explanation: **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.
Question 50: A neonate passes black colored meconium after 12 hours of birth. What is the true statement regarding this observation?
- A. Intestinal hemorrhage
- B. Fibrocystic disease of pancreas
- C. Normal finding (Correct Answer)
- D. Hirschsprung's disease
Explanation: **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.
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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