Neonatology Practice Questions

Q: Which of the following statements regarding bronze baby syndrome is incorrect?

Exchange transfusion is the recommended treatment.. **Explanation:** **Bronze Baby Syndrome** is a rare clinical condition characterized by a grayish-brown discoloration of the skin, serum, and urine in neonates undergoing phototherapy. **1. Why Option D is the correct (incorrect statement):** Exchange transfusion is **not** the recommended treatment for Bronze Baby Syndrome. The condition is generally benign and self-limiting. The primary management involves **discontinuing phototherapy** (if bilirubin levels allow) or continuing it if jaundice is severe, as the bronze pigmentation does not cause neurotoxicity. The discoloration gradually fades over several weeks once phototherapy is stopped. **2. Analysis of other options:** * **Option A:** Phototherapy is the direct trigger. It occurs when infants with **conjugated hyperbilirubinemia** (cholestasis) are exposed to phototherapy. The light causes photo-destruction of copper-porphyrins, leading to the accumulation of brown isomers. * **Option B:** The syndrome shows **spontaneous resolution**. Once the underlying cholestasis improves and phototherapy is ceased, the pigments are excreted, and the skin color returns to normal. * **Option C:** The bronze-grey pigmentation typically manifests most prominently on the **trunk and extremities**, though it can involve the entire body and mucosal surfaces. **High-Yield Clinical Pearls for NEET-PG:** * **Prerequisite:** The presence of **conjugated hyperbilirubinemia** (Direct Bilirubin >2 mg/dL or >20% of Total Bilirubin) is a prerequisite for this syndrome. * **Mechanism:** Accumulation of photo-isomers of copper-porphyrins. * **Contraindication:** While not an absolute contraindication to phototherapy, its appearance should prompt an investigation into the cause of cholestasis (e.g., biliary atresia, neonatal hepatitis). * **Prognosis:** Excellent; it does not increase the risk of Kernicterus.

Q: The 'diving in' reflex, which occurs as a result of perinatal asphyxia, leads to vasoconstriction in all the following organs except?

Heart. **Explanation:** The **'Diving-in' reflex** (also known as the Mammalian Diving Reflex) is a physiological adaptation to **perinatal asphyxia** (hypoxia and hypercapnia). When a neonate experiences oxygen deprivation, the body prioritizes the preservation of vital organs—specifically the **Brain, Heart, and Adrenal glands**. To achieve this, the autonomic nervous system triggers massive peripheral **vasoconstriction** mediated by the sympathetic nervous system. This redistributes blood flow away from non-essential organs toward the vital ones. * **Why Heart is the correct answer:** During the diving reflex, the coronary arteries undergo **vasodilation** (not vasoconstriction) to ensure the myocardium receives maximum oxygenated blood to maintain cardiac output. Therefore, the heart is "spared" from the vasoconstrictive effects seen elsewhere. * **Why other options are incorrect:** The **Kidneys (C)**, **Bowel/Gastrointestinal tract (B)**, and **Skin (D)** are considered non-vital during an acute hypoxic crisis. Vasoconstriction in these areas leads to clinical complications: * Kidney: Results in oliguria or acute tubular necrosis. * Bowel: Predisposes the neonate to Necrotizing Enterocolitis (NEC). * Skin: Causes pallor and delayed capillary refill. **Clinical Pearls for NEET-PG:** 1. **Vital Organs Spared:** Brain, Heart, Adrenals (Mnemonic: **BHA**). 2. **Sarnat Staging:** Used to grade the severity of Hypoxic-Ischemic Encephalopathy (HIE) resulting from this process. 3. **Targeted Hypothermia:** The standard of care for moderate-to-severe HIE, initiated within 6 hours of birth to reduce neuronal apoptosis. 4. **Selective Vasoconstriction:** This reflex is the body's attempt at "autotransfusion" to the brain.

Q: Which of the following findings in a 5-year-old child warrants further investigation?

Buphthalmos. **Explanation:** **Buphthalmos** (Option B) is the correct answer because it is a hallmark sign of **Congenital Glaucoma**. The term literally means "ox-eye" and refers to the progressive enlargement of the globe due to increased intraocular pressure (IOP) acting on the distensible sclera and cornea of an infant. It is a medical emergency that requires surgical intervention (e.g., goniotomy or trabeculotomy) to prevent permanent blindness. Clinical features include the triad of **epiphora (tearing), photophobia, and blepharospasm**, along with corneal clouding. **Analysis of Incorrect Options:** * **Conjunctival Hemorrhage (A):** Commonly seen after vaginal delivery due to the pressure changes in the birth canal. It is a benign, self-limiting condition that resolves within 1–2 weeks without treatment. * **Erythema Toxicum (C):** A common, benign neonatal rash characterized by erythematous macules with central yellow-white wheals or pustules. It typically appears in the first 24–72 hours of life and contains **eosinophils** on smear. * **Mongolian Spots (D):** Now termed Congenital Dermal Melanocytosis, these are bluish-grey pigmented macules usually found over the lumbosacral area. They are due to arrested melanocyte migration and are benign, usually fading by early childhood. **NEET-PG High-Yield Pearls:** * **Buphthalmos** occurs because the infant's eye is elastic; in adults, high IOP does not cause globe enlargement. * **Haab Striae:** Horizontal breaks in Descemet’s membrane seen in congenital glaucoma. * **Erythema Toxicum vs. Pustular Melanosis:** Erythema toxicum contains eosinophils; Transient Neonatal Pustular Melanosis (TNPM) contains neutrophils and is present at birth.

Q: A 1-week-old black infant presents with a large, fairly well-defined, grey-blue lesion over the buttocks bilaterally. The lesion is not palpable, and it is not warm or tender. The mother denies trauma and reports that the lesion has been present since birth. This otherwise well-appearing infant is growing and developing normally and appears normal upon physical examination. What is the most appropriate course of action in this infant?

Reassurance of the normalcy of the condition. The clinical presentation describes **Congenital Dermal Melanocytosis** (formerly known as Mongolian spots). This is a common, benign, birth-related skin condition characterized by flat, blue-grey, or slate-colored patches, most frequently found in the lumbosacral region of infants with darker skin pigmentation (African, Asian, or Hispanic descent). ### **Why Option B is Correct** The underlying mechanism is the **failure of melanocytes to migrate** from the neural crest to the epidermis during fetal development, leaving them trapped in the deep dermis. Because the lesion is non-tender, non-palpable, and present since birth in an otherwise healthy infant, it is considered a normal variant. Most of these lesions fade spontaneously during the first few years of life; therefore, the only management required is **reassurance**. ### **Why Other Options are Incorrect** * **Option A:** While these lesions can sometimes be mistaken for bruises, their characteristic color, location, and presence since birth distinguish them from non-accidental trauma (child abuse). * **Option C:** Soft tissue films are used to identify calcifications (e.g., in dermatomyositis or fat necrosis), which are not features of dermal melanocytosis. * **Option D:** Vitamin K is given at birth to prevent Hemorrhagic Disease of the Newborn. It is not a treatment for hyperpigmented skin lesions. ### **NEET-PG High-Yield Pearls** * **Histology:** Spindle-shaped melanocytes located deep in the dermis. * **Tyndall Effect:** The blue color is due to the scattering of shorter wavelengths of light by the dermal melanin. * **Key Differentiator:** Unlike bruises, these lesions do not change color over days and are not tender. * **Association:** Extensive or multiple lesions (beyond the sacral area) may rarely be associated with lysosomal storage diseases like GM1 gangliosidosis.

Q: What is the normal Mean Corpuscular Volume (MCV) in a neonate?

90-110 fL. **Explanation:** The correct answer is **A. 90-110 fL**. **1. Why it is correct:** Neonatal hematology is characterized by "macrocytosis" relative to adult values. At birth, the Mean Corpuscular Volume (MCV) is significantly higher than in adults (whose normal range is 80-100 fL). In a term neonate, the normal MCV typically ranges from **90 to 110 fL** (averaging around 105 fL). This is due to the rapid erythropoiesis occurring in the intrauterine environment and the presence of a higher percentage of reticulocytes, which are larger than mature red blood cells. **2. Why the other options are incorrect:** * **Options B, C, and D:** These values (110-150 fL) are pathologically high. While MCV can occasionally reach 115-120 fL in extremely premature infants, values consistently above 110 fL in a term neonate suggest underlying pathology, such as maternal folate/B12 deficiency or certain rare congenital hemolytic anemias. **3. High-Yield Clinical Pearls for NEET-PG:** * **Physiological Trend:** The MCV is highest at birth, remains high for the first week, and then gradually declines, reaching adult levels by approximately 1 year of age. * **Hemoglobin at Birth:** Normal cord blood hemoglobin is **14–20 g/dL**. * **Reticulocyte Count:** It is high at birth (3–7%) but drops significantly within the first week of life as erythropoietin production decreases due to improved oxygenation. * **Nucleated RBCs:** It is normal to see 3–10 nucleated RBCs per 100 WBCs in a peripheral smear of a newborn; their persistence beyond 3–4 days may indicate hypoxia or hemolysis.

Question 1

Which of the following statements about Intrauterine Growth Restriction (IUGR) is true?

Accepted Answer

The head circumference is typically 3 cm greater than the chest circumference in IUGR.

Answer

Hepatomegaly in IUGR is due to fatty infiltration.

Answer

Hyaline membrane disease is a common cause of death in IUGR.

Answer

Hypothermia does not occur in IUGR due to effective shivering mechanisms.

Question 2

Which of the following statements is true regarding the resuscitation of a neonate born through meconium-stained amniotic fluid?

Accepted Answer

At least one person skilled in endotracheal intubation should be available during resuscitation.

Answer

Intrapartum suctioning of the mouth and nose may be performed.

Answer

Postnatal tracheal suctioning should be performed for all non-vigorous neonates.

Answer

All neonates born through meconium-stained amniotic fluid should be admitted to the neonatal intensive care unit for at least 6 hours before being discharged to the mother.

Question 3

Late onset hemorrhagic disease of the newborn is characterized by all of the following features except?

Accepted Answer

Usually occurs in exclusively breastfed babies

Answer

Onset occurs at 4-12 weeks of age

Answer

Intracranial hemorrhage can occur

Answer

Intramuscular vitamin K prophylaxis at birth has a protective role

Question 4

Which of the following statements regarding bronze baby syndrome is incorrect?

Accepted Answer

Exchange transfusion is the recommended treatment.

Answer

Phototherapy is responsible for its occurrence.

Answer

It shows spontaneous resolution.

Answer

It typically affects the trunk and extremities.

Question 5

A 3-week-old male infant, born to a primiparous mother, presents with noisy breathing. The child is afebrile, sleeping and feeding well, and has a normal clinical examination. What is the recommended management protocol?

Accepted Answer

Reassure and give saline nasal drops

Answer

Begin IV antibiotics

Answer

Give racemic epinephrine

Answer

Order a chest X-ray

Question 6

A neonate is delivered at 43 weeks' gestation. The infant is apneic, limp, pale, bradycardic, and covered with "pea soup" amniotic fluid. What is the best first step in the resuscitation of this infant at delivery?

Accepted Answer

Intubation and suction of the trachea; provision of oxygen

Answer

Warm and dry the infant

Answer

Chest compressions

Answer

Administration of 100% oxygen by mask

Question 7

The 'diving in' reflex, which occurs as a result of perinatal asphyxia, leads to vasoconstriction in all the following organs except?

Accepted Answer

Heart

Answer

Bowel

Answer

Kidney

Answer

Skin

Question 8

Which of the following findings in a 5-year-old child warrants further investigation?

Accepted Answer

Buphthalmos

Answer

Conjunctival hemorrhage

Answer

Erythema toxicum

Answer

Mongolian spots

Question 9

A 1-week-old black infant presents with a large, fairly well-defined, grey-blue lesion over the buttocks bilaterally. The lesion is not palpable, and it is not warm or tender. The mother denies trauma and reports that the lesion has been present since birth. This otherwise well-appearing infant is growing and developing normally and appears normal upon physical examination. What is the most appropriate course of action in this infant?

Accepted Answer

Reassurance of the normalcy of the condition

Answer

Report the family to child protective services

Answer

Soft tissue films of the buttocks to identify calcifications

Answer

Administration of vitamin K

Question 10

What is the normal Mean Corpuscular Volume (MCV) in a neonate?

Accepted Answer

90-110 fL

Answer

110-125 fL

Answer

125-135 fL

Answer

140-150 fL

Neonatology — MCQs

Neonatology — MCQs

On this page

Practice by Chapter

Want unlimited practice?