Neonatology Practice Questions

Q: What is the most probable diagnosis in this neonate?

Infant of diabetic mother. ***Infant of diabetic mother*** - Characteristic **macrosomic appearance** with **plump, rounded face**, **fat cheeks**, and **large body size** due to maternal hyperglycemia causing fetal hyperinsulinemia. - Classic **cushingoid features** including **truncal obesity** and **red, puffy appearance** are typical findings in IDM babies. *Beckwith Wiedemann syndrome* - Features **macroglossia** (enlarged tongue), **omphalocele**, and **hemihypertrophy** which are not described in this case. - Associated with **ear creases** and **increased risk of embryonal tumors**, distinct from IDM appearance. *Congenital hypothyroidism* - Presents with **prolonged jaundice**, **lethargy**, **constipation**, and **poor feeding** rather than macrosomic features. - Characteristic **coarse facial features** and **macroglossia** develop later, not the plump appearance seen here. *IUGR baby* - Shows **small for gestational age** appearance with **wasted muscle mass** and **thin subcutaneous tissue**. - Features include **wrinkled skin**, **prominent ribs**, and **scrawny appearance** - opposite of the described findings.

Q: Which of the following is NOT a cause of neonatal eye infection?

Proteus mirabilis. **Explanation:** The question asks for the organism that is **not** a typical cause of neonatal eye infection (Ophthalmia Neonatorum). **Why Proteus mirabilis is the correct answer:** Ophthalmia neonatorum is defined as conjunctivitis occurring within the first 28 days of life, usually acquired during passage through the birth canal. While various Gram-positive and Gram-negative bacteria can cause neonatal conjunctivitis, **Proteus mirabilis** is an extremely rare cause and is not considered a standard or significant pathogen in this clinical context. It is more commonly associated with urinary tract infections or wound infections in older infants. **Analysis of incorrect options:** * **Chlamydia trachomatis (Serotypes D-K):** This is currently the **most common cause** of ophthalmia neonatorum worldwide. It typically presents 5–14 days after birth. * **Gonococci (Neisseria gonorrhoeae):** This is the **most serious cause** due to the risk of corneal perforation and blindness. It presents early (usually 2–5 days) with hyperacute purulent discharge. * **Staphylococcus aureus:** This is a common cause of "non-specific" bacterial conjunctivitis in neonates, often acquired from the environment or skin flora rather than the birth canal. **High-Yield Clinical Pearls for NEET-PG:** * **Incubation Periods:** * Chemical (Silver nitrate): <24 hours. * Gonococcal: 2–5 days (Most severe). * Chlamydia: 5–14 days (Most common). * **Treatment:** * Gonococcal: Systemic Ceftriaxone. * Chlamydia: **Oral Erythromycin** (Topical therapy is insufficient and oral treatment prevents Chlamydial pneumonia). * **Prophylaxis:** 0.5% Erythromycin ointment is the standard of care immediately after birth.

Q: An infant born at 35 weeks' gestation to a mother with no prenatal care is noted to be jittery and irritable, and is having difficulty feeding. The infant exhibits coarse tremors, a high-pitched cry, and has experienced several episodes of diarrhea and emesis. What substance is the infant most likely withdrawing from?

Heroin. ### Explanation The clinical presentation described is classic for **Neonatal Abstinence Syndrome (NAS)**, most commonly associated with **Opioid withdrawal** (e.g., Heroin or Methadone). **Why Heroin is correct:** Opioid withdrawal in neonates typically manifests within 24–72 hours of birth. The symptoms are categorized into three main areas: 1. **Neuromuscular Irritability:** Jitteriness, coarse tremors, hypertonicity, and a high-pitched cry. 2. **Gastrointestinal Dysfunction:** Poor feeding, diarrhea, and vomiting (emesis). 3. **Autonomic Reactivity:** Sweating, sneezing, and yawning. The combination of CNS irritability and GI distress is the hallmark of heroin withdrawal. **Why the other options are incorrect:** * **Alcohol:** Fetal Alcohol Syndrome (FAS) presents with structural defects (short palpebral fissures, thin upper lip, smooth philtrum) and growth retardation rather than acute withdrawal tremors and diarrhea. * **Marijuana:** Prenatal exposure may lead to mild neurobehavioral effects or low birth weight, but it does not cause a distinct, acute withdrawal syndrome like NAS. * **Cocaine:** Cocaine is a stimulant that causes vasoconstriction. Exposure typically leads to IUGR, placental abruption, or "jitteriness," but it does not produce a true withdrawal syndrome or significant GI symptoms like diarrhea. **High-Yield Clinical Pearls for NEET-PG:** * **Finnegan Scoring System:** Used to monitor the severity of NAS and guide pharmacological treatment. * **First-line Management:** Supportive care (swaddling, frequent small feeds, low-stimulation environment). * **Pharmacotherapy:** If supportive care fails, **Morphine** or **Methadone** is the drug of choice for opioid withdrawal. * **Timing:** Heroin withdrawal starts early (1–3 days), whereas Methadone withdrawal may be delayed (up to 2 weeks).

Q: Newborns have transplacentally acquired immunity against all of the following diseases except –

Pertussis. **Explanation:** The correct answer is **Pertussis**. Passive immunity in newborns is primarily mediated by the transplacental transfer of maternal **IgG antibodies**, which begins around the 20th week of gestation and peaks in the third trimester. **1. Why Pertussis is the correct answer:** Maternal antibodies against *Bordetella pertussis* (whether from natural infection or vaccination) are generally low in titer and do not cross the placenta in sufficient quantities to provide clinical protection to the neonate. Consequently, newborns are highly susceptible to pertussis from birth, which is why the **Tdap vaccine** is specifically recommended for pregnant women (ideally between 27–36 weeks) to boost antibody levels and provide some protection to the infant until they receive their own DTaP series at 6 weeks. **2. Why the other options are incorrect:** * **Measles:** Maternal IgG provides robust protection to the newborn, typically lasting for 6 to 9 months. This is why the first dose of the Measles vaccine is delayed until 9 months of age. * **Diphtheria:** High levels of maternal antitoxin are transferred across the placenta, providing passive immunity for the first few months of life. * **Poliomyelitis:** Maternal antibodies against Poliovirus are effectively transferred, offering protection to the neonate against paralytic disease during early infancy. **Clinical Pearls for NEET-PG:** * **IgG** is the only immunoglobulin that crosses the placenta (via neonatal Fc receptors). * **IgA** is provided to the infant via colostrum and breast milk (mucosal immunity). * **High-yield "Except" list:** Newborns lack significant passive immunity against **Pertussis** and **Tetanus** (unless the mother is specifically immunized during pregnancy). This is the physiological basis for the Maternal and Neonatal Tetanus Elimination (MNTE) strategy.

Q: Infants diagnosed with Intrauterine Growth Restriction (IUGR) at birth are termed as:

Small for gestational age. **Explanation:** **1. Why the correct answer is right:** The term **Small for Gestational Age (SGA)** is a clinical definition based on birth weight. It refers to any neonate whose birth weight is below the **10th percentile** for their specific gestational age. While **Intrauterine Growth Restriction (IUGR)** is a dynamic, antenatal ultrasound diagnosis (indicating a fetus has not reached its biological growth potential due to pathological factors), **SGA** is the term used to describe these infants at birth based on static measurements. **2. Why the incorrect options are wrong:** * **A. Growth retarded:** This is an outdated term. While IUGR stands for growth restriction, the clinical designation of the infant at birth is SGA. * **C. Low birth weight (LBW):** This is a weight-based definition regardless of gestational age. Any infant weighing **<2500g** is LBW. An SGA infant can be LBW, but a preterm infant can also be LBW without being growth-restricted. * **D. Preterm:** This refers strictly to the timing of birth (**<37 completed weeks**). An infant can be SGA but born at full term (e.g., a 40-weeker weighing 2kg). **3. High-Yield Clinical Pearls for NEET-PG:** * **Symmetric IUGR:** Insult occurs early in pregnancy (e.g., chromosomal anomalies, TORCH infections). Both head circumference and body weight are low. * **Asymmetric IUGR:** Insult occurs late (e.g., placental insufficiency, maternal hypertension). "Head sparing" effect is seen; weight is reduced more than head circumference. * **Ponderal Index:** Used to identify asymmetric IUGR. * **Complications of SGA/IUGR:** Hypothermia, **Hypoglycemia** (due to low glycogen stores), **Polycythemia** (due to fetal hypoxia), and Hypocalcemia.

Q: Which of the following disorders is an indication for the use of steroids in neonates?

Bronchopulmonary dysplasia. **Explanation:** **Bronchopulmonary Dysplasia (BPD)** is the correct answer because it is a chronic lung disease characterized by intense inflammation and lung injury in preterm infants. Steroids (such as Dexamethasone or Hydrocortisone) are used due to their potent **anti-inflammatory properties**, which help reduce lung edema, improve lung compliance, and facilitate weaning from mechanical ventilation. However, they are typically reserved for infants who cannot be weaned from the ventilator after 1–2 weeks, as early use is associated with an increased risk of cerebral palsy. **Why other options are incorrect:** * **Pulmonary Hypoplasia:** This is a structural defect where there is an underdevelopment of alveoli and pulmonary vasculature (often secondary to oligohydramnios or diaphragmatic hernia). Steroids do not correct structural lung deficits; management focuses on gentle ventilation and treating associated pulmonary hypertension. * **Oesophageal Atresia:** This is a surgical anatomical anomaly. Steroids have no role in its management, which requires surgical repair to establish esophageal continuity. **High-Yield Clinical Pearls for NEET-PG:** * **DART Protocol:** A low-dose dexamethasone regimen often used to facilitate extubation in BPD. * **Antenatal Steroids:** (Betamethasone/Dexamethasone) are given to the mother to prevent RDS, but **Postnatal Steroids** are specifically used to treat or prevent BPD. * **Side Effects:** Monitor for hyperglycemia, hypertension, intestinal perforation (especially when used with Indomethacin), and long-term neurodevelopmental delays.

Q: Neonatal hypothermia can be prevented by all of the following EXCEPT?

Cold chain. **Explanation:** The correct answer is **Cold chain** because it is a system used for maintaining the potency of vaccines from the point of manufacture to the point of administration. In contrast, neonatal care focuses on maintaining a **Warm chain** to prevent heat loss. **Why the other options are incorrect:** * **Warm Chain:** This is a set of 10 interlinked procedures (e.g., warm delivery room, immediate drying, skin-to-skin contact, breastfeeding) performed at birth and during the following hours to prevent hypothermia. * **Kangaroo Mother Care (KMC):** A proven method for stable low-birth-weight infants involving continuous skin-to-skin contact, which provides effective thermal regulation and promotes breastfeeding. * **Radiant Warmer:** An external heat source used in hospitals to maintain a newborn's body temperature, especially during resuscitation or for sick neonates who require frequent monitoring. **Clinical Pearls for NEET-PG:** * **Definition of Hypothermia:** Axillary temperature **<36.5°C (97.7°F)**. * **Classification:** * Mild (Cold Stress): 36.0°C to 36.4°C * Moderate: 32.0°C to 35.9°C * Severe: <32.0°C * **Mechanism of Heat Production:** Neonates primarily produce heat through **non-shivering thermogenesis** via the metabolism of **brown adipose tissue** (located in the interscapular region, axilla, and around kidneys). * **The "Golden Hour":** The first hour after birth is critical for establishing the warm chain to reduce neonatal morbidity and mortality.

Q: Which of the following is NOT a complication of prematurity?

Retinitis pigmentosa. **Explanation:** The correct answer is **Retinitis pigmentosa (C)** because it is a genetic, degenerative eye disease characterized by the progressive loss of photoreceptor cells (rods and cones). It is not caused by premature birth. In contrast, the ocular complication associated with prematurity is **Retinopathy of Prematurity (ROP)**, which involves abnormal vascularization of the retina due to oxygen toxicity and immaturity. **Why the other options are complications of prematurity:** * **Intraventricular Hemorrhage (IVH):** Premature infants have a highly vascularized, fragile **germinal matrix** that lacks structural support. Fluctuations in cerebral blood flow easily lead to rupture and bleeding into the ventricles. * **Necrotizing Enterocolitis (NEC):** This is the most common gastrointestinal emergency in neonates. It occurs due to a combination of intestinal immaturity, ischemia, and early enteral feeding, leading to mucosal injury and bacterial invasion. * **Periventricular Leukomalacia (PVL):** This refers to white matter injury near the lateral ventricles. It is caused by ischemia or inflammation in the "watershed" areas of the brain, often leading to spastic diplegia (Cerebral Palsy). **High-Yield Clinical Pearls for NEET-PG:** * **IVH Screening:** Routine cranial ultrasound is recommended for all neonates born at **<32 weeks** gestation. * **NEC Radiographic Sign:** The pathognomonic finding on X-ray is **Pneumatosis intestinalis** (air within the bowel wall). * **ROP Screening:** In India, screening is indicated for infants born **≤32 weeks** or birth weight **≤1500g**, or those with an unstable clinical course. * **Surfactant Deficiency:** Remember that Respiratory Distress Syndrome (RDS) is the most common respiratory complication of prematurity.

Question 1

What is the most probable diagnosis in this neonate?

Accepted Answer

Infant of diabetic mother

Answer

Beckwith Wiedemann syndrome

Answer

Congenital hypothyroidism

Answer

IUGR baby

Question 2

Which of the following is NOT a cause of neonatal eye infection?

Accepted Answer

Proteus mirabilis

Answer

Staphylococcus aureus

Answer

Gonococci

Answer

Chlamydia

Question 3

An infant born at 35 weeks' gestation to a mother with no prenatal care is noted to be jittery and irritable, and is having difficulty feeding. The infant exhibits coarse tremors, a high-pitched cry, and has experienced several episodes of diarrhea and emesis. What substance is the infant most likely withdrawing from?

Accepted Answer

Heroin

Answer

Alcohol

Answer

Marijuana

Answer

Cocaine

Question 4

Newborns have transplacentally acquired immunity against all of the following diseases except –

Accepted Answer

Pertussis

Answer

Measles

Answer

Diphtheria

Answer

Poliomyelitis

Question 5

All of the following are true about neonatal sepsis except?

Accepted Answer

The most common transmission of infection is through nursery personnel.

Answer

Premature babies are predisposed to sepsis.

Answer

Late initiation of breast feeding is a predisposing factor.

Answer

Premature rupture of membranes predisposes to sepsis.

Question 6

Probiotics are useful for which of the following conditions?

Accepted Answer

Necrotizing enterocolitis

Answer

Breast milk jaundice

Answer

Hospital acquired pneumonia

Answer

Neonatal seizures

Question 7

Infants diagnosed with Intrauterine Growth Restriction (IUGR) at birth are termed as:

Accepted Answer

Small for gestational age

Answer

Growth retarded

Answer

Low birth weight

Answer

Preterm

Question 8

Which of the following disorders is an indication for the use of steroids in neonates?

Accepted Answer

Bronchopulmonary dysplasia

Answer

Pulmonary hypoplasia

Answer

Oesophageal atresia

Answer

None of the above

Question 9

Neonatal hypothermia can be prevented by all of the following EXCEPT?

Accepted Answer

Cold chain

Answer

Warm chain

Answer

Kangaroo Mother care

Answer

Radiant warmer

Question 10

Which of the following is NOT a complication of prematurity?

Accepted Answer

Retinitis pigmentosa

Answer

Intraventricular hemorrhage

Answer

Necrotizing enterocolitis

Answer

Periventricular leukomalacia

Neonatology — MCQs

Neonatology — MCQs

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