Neonatology Practice Questions

Q: A fetus born to a mother with a history of fever with rash in the first trimester of pregnancy shows chorioretinitis, cerebral cortical atrophy, cutaneous scarring, and bone leg defects. What is the most probable cause?

Maternal varicella. The clinical presentation described is classic for **Congenital Varicella Syndrome (CVS)**. This occurs when a pregnant woman contracts primary varicella-zoster virus (VZV) infection, typically between 8 and 20 weeks of gestation. ### **Why Maternal Varicella is Correct** The hallmark of CVS is the involvement of the skin and nervous system. The virus follows a dermatomal distribution, leading to: * **Cutaneous scarring:** Characterized by "cicatricial" or zigzag skin lesions. * **Limb hypoplasia:** Bone and muscle defects (e.g., rudimentary digits or leg defects). * **Neurological damage:** Cerebral cortical atrophy, microcephaly, and seizures. * **Ocular defects:** Chorioretinitis and cataracts. ### **Why Other Options are Incorrect** * **Maternal Rubella:** Presents with the "Classic Triad" of cataracts, sensorineural hearing loss, and congenital heart disease (PDA/Peripheral Pulmonary Artery Stenosis). It does not cause limb hypoplasia or cicatricial scarring. * **Maternal CMV:** The most common congenital infection. It typically presents with **periventricular calcifications**, microcephaly, and sensorineural hearing loss. * **Maternal Toxoplasma:** Characterized by the "Sabin Triad": **diffuse** intracranial calcifications, hydrocephalus, and chorioretinitis. It does not cause limb defects. ### **NEET-PG High-Yield Pearls** * **Risk Period:** The highest risk for CVS is during the **first 20 weeks** of gestation (peak risk at 13–20 weeks). * **Neonatal Varicella:** If the mother develops a rash 5 days before to 2 days after delivery, the neonate is at risk of severe disseminated varicella and requires **VZIG (Varicella-Zoster Immunoglobulin)**. * **Key Differentiator:** Whenever you see **"limb hypoplasia"** or **"zigzag scarring"** in a TORCH-related question, think Varicella.

Q: What is the weight of a very low birth weight infant?

<1500 gm. **Explanation:** The classification of newborns based on birth weight is a high-yield topic in Neonatology. This classification is independent of the gestational age and is used to predict neonatal morbidity and mortality. **1. Why Option B is Correct:** A **Very Low Birth Weight (VLBW)** infant is defined by the World Health Organization (WHO) as a neonate weighing **less than 1500 grams** at birth. These infants require specialized neonatal intensive care (NICU) due to a high risk of complications like Respiratory Distress Syndrome (RDS), Intraventricular Hemorrhage (IVH), and Necrotizing Enterocolitis (NEC). **2. Analysis of Incorrect Options:** * **Option A (1000 gm):** This is the threshold for **Extremely Low Birth Weight (ELBW)**, which is defined as <1000 gm. * **Option C (<2500 gm):** This defines a **Low Birth Weight (LBW)** infant. It is the most common classification encountered in clinical practice. * **Option D ( 4000 gm (often associated with maternal diabetes). * **Note on Symbols:** Always pay attention to the **"<" (less than)** sign. For example, LBW is strictly *less than* 2500g; a baby weighing exactly 2500g is considered normal birth weight. * **Ponderal Index:** Used to differentiate between symmetrical and asymmetrical IUGR (Formula: Weight in gm / Length in $cm^3 \times 100$).

Q: A neonate presents with mild growth retardation and facial dysmorphology. The mother has a history of substance abuse. What is the most likely cause of this infant's condition?

Alcohol. The clinical presentation of growth retardation and facial dysmorphology in a neonate with a maternal history of substance abuse is classic for **Fetal Alcohol Syndrome (FAS)**. ### **Explanation of the Correct Answer** **Alcohol (Option A)** is a potent teratogen. FAS is characterized by a triad of: 1. **Growth Retardation:** Prenatal and/or postnatal growth deficiency. 2. **Facial Dysmorphology:** Specifically smooth philtrum, thin upper lip (vermilion border), and short palpebral fissures. 3. **CNS Involvement:** Microcephaly, intellectual disability, or behavioral issues (ADHD). Alcohol crosses the placenta freely, and the fetus lacks the ADH enzyme to metabolize it, leading to direct cellular toxicity and impaired neuronal migration. ### **Why Other Options are Incorrect** * **Cocaine (Option B):** Associated with placental abruption, prematurity, and neonatal stroke/infarction. It does not typically cause a specific pattern of facial dysmorphism. * **Ethylene Glycol (Option C):** This is an industrial poison (antifreeze). While toxic to the mother (causing metabolic acidosis and renal failure), it is not a recognized cause of a specific neonatal dysmorphic syndrome. * **Heroin (Option D):** Opioid abuse primarily leads to **Neonatal Abstinence Syndrome (NAS)**, characterized by irritability, tremors, high-pitched cry, and diarrhea. It does not cause structural dysmorphism. ### **High-Yield Clinical Pearls for NEET-PG** * **Most common cause** of non-genetic intellectual disability: Fetal Alcohol Syndrome. * **Critical Period:** Facial features are typically affected by alcohol exposure during the **first trimester**. * **Other features of FAS:** Cardiac defects (VSD is most common), "railroad track" ears, and hockey-stick palmar crease. * **Diagnosis:** Requires all three features (Growth retardation, Facial phenotype, and CNS involvement).

Q: What is the single most effective step in resuscitation of babies who fail to breathe at birth?

Positive pressure ventilation. **Explanation:** The primary goal of neonatal resuscitation is to establish effective lung aeration. In a newborn who fails to breathe or remains gasping after initial steps, **Positive Pressure Ventilation (PPV)** is the single most important and effective step. This is because the fundamental pathophysiology in most neonatal depression is respiratory failure; providing PPV helps clear fetal lung fluid, expand the alveoli, and initiate gas exchange, which subsequently increases the heart rate—the most sensitive indicator of successful resuscitation. **Analysis of Incorrect Options:** * **A. Suction of airways:** Routine suctioning is no longer recommended as it can cause trauma and induced bradycardia via the vagal reflex. It is only indicated if the airway is obstructed by secretions or meconium. * **B. Tactile stimulation:** While flicking the soles or rubbing the back can stimulate a "primary apnea" baby to breathe, it is a part of the "Initial Steps." If the baby does not respond immediately, continuing stimulation wastes "Golden Minute" time that should be used for PPV. * **C. Chest compressions:** These are only indicated if the heart rate remains below 60 bpm *after* at least 30 seconds of effective PPV. Compressions are ineffective if the lungs have not been adequately ventilated first. **Clinical Pearls for NEET-PG:** * **The Golden Minute:** The first 60 seconds of life are dedicated to completing the initial steps and starting PPV if required. * **Indicator of Success:** An increasing **Heart Rate** is the most important sign of effective PPV. * **MR. SOPA:** If the chest is not rising during PPV, use this corrective mnemonic (Mask adjustment, Reposition airway, Suction, Open mouth, Pressure increase, Alternative airway). * **Oxygen Concentration:** For term babies (≥35 weeks), start PPV with 21% oxygen (room air). For preterm babies (<35 weeks), start with 21–30% oxygen.

Q: A term newborn presents with frothing, excessive drooling, and coughing with feeds. There was a history of polyhydramnios in the antenatal period. A chest X-ray was done showing a specific finding. What is the diagnosis?

Esophageal atresia with tracheoesophageal fistula. ***Esophageal atresia with tracheoesophageal fistula*** - Classic presentation of **frothing**, **excessive drooling**, and **coughing with feeds** combined with **antenatal polyhydramnios** strongly suggests esophageal atresia with TEF. - Chest X-ray shows **coiled nasogastric tube** in the blind esophageal pouch and **gas in the stomach** (confirming distal TEF - Type C malformation). *Congenital diaphragmatic hernia* - Chest X-ray would show **bowel loops in the thoracic cavity** with **mediastinal shift**, not a coiled NG tube. - Presents with **respiratory distress** and **scaphoid abdomen**, rather than feeding difficulties and drooling. *Esophageal atresia only* - Would present with similar **drooling** and **choking**, but chest X-ray shows **gasless abdomen** due to absence of TEF. - **Nasogastric tube** would coil in the blind pouch, but no air would reach the stomach through a fistula. *Hypertrophic pyloric stenosis* - Typically presents at **2-8 weeks of age** with **projectile vomiting** after feeds, not in the neonatal period. - **No antenatal polyhydramnios** and chest X-ray would be normal, with diagnosis made by **ultrasound** showing thickened pyloric muscle.

Q: Which of the following is NOT true regarding the indications for exchange transfusion in neonates?

Total bilirubin of 10 mg/dL. **Explanation:** Exchange transfusion is an emergency procedure used in neonatal jaundice to prevent bilirubin encephalopathy (Kernicterus) by rapidly removing bilirubin and antibody-coated RBCs. **Why Option D is the correct answer:** A total serum bilirubin (TSB) of **10 mg/dL** is generally considered a safe level in most neonates and is **not** an indication for exchange transfusion. For a full-term healthy neonate, the threshold for exchange transfusion typically starts at **20 mg/dL** or higher. Even in preterm or high-risk infants, 10 mg/dL is usually managed with intensive phototherapy rather than an invasive exchange procedure. **Analysis of Incorrect Options (Indications for Exchange):** * **A & B (Cord Blood Parameters):** In cases of Rh isoimmunization, a **cord bilirubin ≥ 5 mg/dL** or a **cord hemoglobin ≤ 10 g/dL** are classic immediate indications for exchange transfusion, as they signify severe hemolysis occurring in utero. * **C (Rate of Rise):** A rapid increase in bilirubin (**> 0.5 mg/dL/hour**) despite intensive phototherapy indicates that hemolysis is outstripping the body's ability to clear bilirubin, necessitating an exchange. **NEET-PG High-Yield Pearls:** * **Double Volume Exchange Transfusion (DVET):** The standard method using 160 ml/kg of blood; it removes 85% of sensitized RBCs and reduces TSB by 50%. * **Most common indication:** Historically Rh isoimmunization; currently, it is more commonly performed for ABO incompatibility or G6PD deficiency. * **Complication:** The most common metabolic complication is **hypocalcemia** (due to citrate anticoagulant in stored blood). * **Decision Tool:** Always refer to the **AAP (American Academy of Pediatrics) nomograms** which factor in gestational age and risk factors.

Q: The item shown below is used to feed newborns born at what gestational age?

33 weeks. ***33 weeks*** - The **paladai (cup feeder)** shown is ideal for preterm infants around **32-34 weeks** when **suck-swallow-breathe coordination** begins to mature but is not yet fully developed. - At this gestational age, infants can manage **cup feeding** as a bridge between **tube feeding** and direct **breastfeeding**. *27 weeks* - Extremely preterm infants at this age lack adequate **neurological maturation** for safe oral feeding and require **nasogastric** or **orogastric tube feeding**. - **Suck-swallow-breathe coordination** is underdeveloped, making any oral feeding method unsafe due to high **aspiration risk**. *30 weeks* - Most infants at 30 weeks still require **tube feeding** as their **sucking reflex** and **swallowing coordination** are immature. - The **respiratory control** necessary for safe feeding while breathing is not sufficiently developed at this gestational age. *37 weeks* - **Term infants** at 37 weeks have fully developed **feeding reflexes** and can directly **breastfeed** or bottle feed without assistance. - The paladai is unnecessary for term infants who have mature **suck-swallow-breathe coordination** and can feed efficiently from breast or bottle.

Q: A three-day-old term infant, born at home and exclusively breast-fed, presented with lethargy, bulging fontanel, and bright red blood from the rectum. What is the most likely etiology of this condition?

Vitamin K deficiency.. This clinical scenario describes a classic presentation of **Vitamin K Deficiency Bleeding (VKDB)**, specifically the "Early" or "Classical" form. ### **Why Vitamin K Deficiency is Correct** Neonates are naturally deficient in Vitamin K due to poor placental transfer, a sterile gut (lack of K2-producing bacteria), and low concentrations in breast milk. Without Vitamin K, the liver cannot perform the **gamma-carboxylation** of clotting factors **II, VII, IX, and X**. * **Clinical Correlation:** The "bright red blood from the rectum" indicates gastrointestinal hemorrhage, while the "bulging fontanel" and "lethargy" are hallmark signs of **intracranial hemorrhage (ICH)**. Home births are a major risk factor as these infants often miss the routine prophylactic Vitamin K injection at birth. ### **Why Other Options are Incorrect** * **Fluoride deficiency:** Primarily affects dental enamel and bone mineralization; it does not cause acute bleeding or neurological symptoms. * **Calcium deficiency:** Neonatal hypocalcemia typically presents with jitteriness, seizures, or tetany, but not spontaneous systemic or intracranial bleeding. * **Iron deficiency:** Usually manifests as microcytic anemia later in infancy (4–6 months). It does not cause acute hemorrhagic disease in a three-day-old. ### **NEET-PG High-Yield Pearls** * **Classification of VKDB:** * **Early:** Within 24 hours (usually due to maternal drugs like anticonvulsants). * **Classical:** Days 1–7 (typically GI or skin bleeding). * **Late:** Week 2 to 6 months (highest risk of **Intracranial Hemorrhage**; often associated with malabsorption or exclusive breastfeeding). * **Lab Findings:** Prolonged **Prothrombin Time (PT)** is the earliest and most sensitive indicator. * **Prevention:** 1 mg of intramuscular Vitamin K1 (Phytonadione) at birth is the standard of care.

Question 1

A fetus born to a mother with a history of fever with rash in the first trimester of pregnancy shows chorioretinitis, cerebral cortical atrophy, cutaneous scarring, and bone leg defects. What is the most probable cause?

Accepted Answer

Maternal varicella

Answer

Maternal rubella

Answer

Maternal CMV

Answer

Maternal toxoplasma

Question 2

What is the weight of a very low birth weight infant?

Accepted Answer

<1500 gm

Answer

1000 gm

Answer

<2500 gm

Answer

<750 gm

Question 3

A neonate presents with mild growth retardation and facial dysmorphology. The mother has a history of substance abuse. What is the most likely cause of this infant's condition?

Accepted Answer

Alcohol

Answer

Cocaine

Answer

Ethylene glycol

Answer

Heroin

Question 4

What is the single most effective step in resuscitation of babies who fail to breathe at birth?

Accepted Answer

Positive pressure ventilation

Answer

Suction of airways

Answer

Tactile stimulation

Answer

Chest compressions

Question 5

A term newborn presents with frothing, excessive drooling, and coughing with feeds. There was a history of polyhydramnios in the antenatal period. A chest X-ray was done showing a specific finding. What is the diagnosis?

Accepted Answer

Esophageal atresia with tracheoesophageal fistula

Answer

Congenital diaphragmatic hernia

Answer

Esophageal atresia only

Answer

Hypertrophic pyloric stenosis

Question 6

Bag and mask ventilation is contraindicated in all except?

Accepted Answer

Transient tachypnea of newborn

Answer

Tracheo-esophageal fistula

Answer

Diaphragmatic hernia

Answer

Meconium aspiration syndrome

Question 7

Which of the following is NOT true regarding the indications for exchange transfusion in neonates?

Accepted Answer

Total bilirubin of 10 mg/dL

Answer

Cord bilirubin of 5 mg/dL or more

Answer

Cord hemoglobin of 10 mg/dL or less

Answer

Rate of rise of bilirubin > 0.5 mg/dL per hour

Question 8

The item shown below is used to feed newborns born at what gestational age?

Accepted Answer

33 weeks

Answer

27 weeks

Answer

30 weeks

Answer

37 weeks

Question 9

A 4-day-old infant, delivered at home, is brought to the emergency with complaints of bleeding from the umbilical stump. His PT is 24 seconds, APTT is 37 seconds, and platelet count is 200,000/mm3. Apart from maintaining intravascular volume, what would be the definitive line of management?

Accepted Answer

Administer Vitamin K

Answer

Transfuse FFP

Answer

Start Antibiotics

Answer

Start inotropic support

Question 10

A three-day-old term infant, born at home and exclusively breast-fed, presented with lethargy, bulging fontanel, and bright red blood from the rectum. What is the most likely etiology of this condition?

Accepted Answer

Vitamin K deficiency.

Answer

Fluoride deficiency.

Answer

Calcium deficiency.

Answer

Iron deficiency.

Neonatology — MCQs

Neonatology — MCQs

On this page

Practice by Chapter

Want unlimited practice?