Neonatology Practice Questions

Q: What is the blood glucose level considered hyperglycemia in a neonate?

125 mg/dL. **Explanation:** In neonatology, **hyperglycemia** is defined as a whole blood glucose level **>125 mg/dL** or a plasma glucose level **>145–150 mg/dL**, regardless of the infant's gestational age or weight. The threshold of 125 mg/dL is clinically significant because it often exceeds the renal threshold for glucose in preterm neonates, leading to **osmotic diuresis**, dehydration, and an increased risk of intraventricular hemorrhage (IVH) due to rapid shifts in serum osmolality. **Analysis of Options:** * **Option B (125 mg/dL):** This is the standard diagnostic cutoff for whole blood glucose in neonates. It is a high-yield fact frequently tested in NEET-PG. * **Option A & C (150 mg/dL & 180 mg/dL):** While these values represent significant hyperglycemia and are often the thresholds for initiating medical intervention (like insulin or reducing glucose infusion rates), they are not the *defining* lower limit. 150 mg/dL is specifically the threshold for plasma glucose. * **Option D (100 mg/dL):** This is within the normal glycemic range for a stable neonate. **Clinical Pearls for NEET-PG:** 1. **Most Common Cause:** Iatrogenic (excessive Glucose Infusion Rate - GIR) is the most common cause, especially in Very Low Birth Weight (VLBW) infants. 2. **Neonatal Diabetes:** Defined as hyperglycemia occurring within the first month of life lasting >2 weeks; it is most commonly transient. 3. **Management:** The first step is reducing the GIR. Insulin is reserved for persistent hyperglycemia (>200–250 mg/dL) despite GIR optimization. 4. **Hypoglycemia Refresher:** Remember that for NEET-PG, neonatal hypoglycemia is generally defined as <45 mg/dL.

Q: Which of the following is best for the transport of a newborn while maintaining body temperature?

Kangaroo Mother Care (KMC). **Explanation:** The primary goal of neonatal transport is to maintain the "warm chain" to prevent neonatal cold stress and hypoglycemia. **Why Kangaroo Mother Care (KMC) is the Correct Answer:** KMC is considered the **gold standard** for transporting stable low-birth-weight (LBW) newborns, especially in resource-limited settings. It utilizes **skin-to-skin contact**, where the mother’s body acts as a natural "active" heat source, providing continuous thermal regulation. Unlike mechanical devices, KMC also facilitates breastfeeding, reduces transport-related stress, and provides sensory stimulation, making it the most effective and safest method for maintaining temperature during transit. **Analysis of Incorrect Options:** * **Transport Incubator:** While effective, these are expensive, require a continuous power supply, and are often bulky. They are generally reserved for unstable neonates requiring mechanical ventilation. * **Thermacol Box:** This is a "passive" insulation method. While it can reduce heat loss, it cannot generate heat. It is an outdated practice and inferior to the active warming provided by KMC. * **Hot Water Bottle:** This is **strictly contraindicated**. Newborn skin is extremely thin and poorly vascularized; hot water bottles pose a high risk of accidental contact burns and hyperthermia. **High-Yield Clinical Pearls for NEET-PG:** * **Neutral Thermal Environment (NTE):** The environmental temperature range where the baby maintains a normal body temperature with minimum metabolic rate and oxygen consumption. * **Components of KMC:** Skin-to-skin contact, exclusive breastfeeding, and early discharge. * **Transport Criteria:** Always stabilize the "ABC" (Airway, Breathing, Circulation) and ensure the baby is warm before initiating transport. KMC is the preferred method for stable babies <2500g.

Q: A neonate born at 34 weeks gestation with premature rupture of membranes undergoes a chest X-ray. Which of the following is LEAST likely to be considered in the differential diagnosis of the findings on the chest X-ray?

Ventricular septal defect. ***Ventricular septal defect*** - **VSD** primarily causes **cardiomegaly** and **pulmonary plethora** on chest X-ray, not the typical respiratory distress patterns expected in a premature neonate. - The chest X-ray findings in this clinical scenario would more likely show **pulmonary parenchymal changes** rather than cardiac abnormalities. *Congenital pneumonia* - **Premature rupture of membranes (PROM)** significantly increases the risk of **ascending bacterial infection** leading to congenital pneumonia. - Chest X-ray typically shows **bilateral infiltrates**, **consolidation**, or **reticulogranular opacities** similar to other neonatal lung diseases. *Hyaline membrane disease* - **Prematurity at 34 weeks** places this neonate at high risk for **surfactant deficiency** causing hyaline membrane disease (respiratory distress syndrome). - Classic chest X-ray findings include **reticulogranular opacities**, **air bronchograms**, and **low lung volumes**. *Congenital alveolar proteinosis* - Presents with **bilateral pulmonary infiltrates** and **reticulogranular pattern** on chest X-ray, mimicking other neonatal respiratory conditions. - Can cause **respiratory distress** in neonates and appears radiographically similar to **hyaline membrane disease** or **congenital pneumonia**.

Q: With reference to Respiratory Distress Syndrome (RDS), all of the following statements are true EXCEPT:

Is treated by administering 100% oxygen.. ### Explanation **Respiratory Distress Syndrome (RDS)**, also known as Hyaline Membrane Disease, is primarily caused by a deficiency of pulmonary surfactant in preterm neonates. **Why Option D is the Correct Answer (The False Statement):** Administering **100% oxygen** is contraindicated in the management of RDS. High concentrations of supplemental oxygen in preterm neonates lead to the production of free radicals, causing oxidative stress. This significantly increases the risk of **Retinopathy of Prematurity (ROP)** and **Bronchopulmonary Dysplasia (BPD)**. The goal of treatment is to maintain oxygen saturation ($SpO_2$) between **91% and 95%** using the lowest possible fraction of inspired oxygen ($FiO_2$). **Analysis of Other Options:** * **Option A:** RDS is inversely proportional to gestational age. It most commonly affects infants born **before 34 weeks**, as surfactant production by Type II pneumocytes only reaches maturity after 35 weeks. * **Option B:** Infants of diabetic mothers (IDM) are at higher risk because **hyperinsulinemia** in the fetus antagonizes the action of cortisol, thereby delaying surfactant synthesis. * **Option C:** RDS leads to alveolar collapse (atelectasis), resulting in a ventilation-perfusion (V/Q) mismatch and right-to-left shunting, which clinically manifests as **cyanosis**. **NEET-PG High-Yield Pearls:** * **L/S Ratio:** A Lecithin/Sphingomyelin ratio of **>2:1** in amniotic fluid indicates lung maturity. * **Ground Glass Opacity:** The classic X-ray finding in RDS is a diffuse reticulogranular pattern with **air bronchograms**. * **Treatment of Choice:** Early application of **Nasal CPAP** and exogenous **Surfactant replacement therapy** (e.g., Poractant alfa) via the INSURE technique (Intubate-Surfactant-Extubate). * **Prevention:** Antenatal corticosteroids (Dexamethasone or Betamethasone) administered to the mother at risk of preterm labor.

Q: A 28-year-old woman gave birth to a small for gestational age newborn at 38 weeks of pregnancy. On examination, the newborn was found to have rhinitis, a distended abdomen, wrinkled skin, and palmoplantar blisters. The woman had an earlier history of abortion and stillbirth. What is the most likely diagnosis?

Congenital syphilis. ### Explanation The clinical presentation described is classic for **Early Congenital Syphilis** (symptoms appearing before 2 years of age). **Why Congenital Syphilis is correct:** The diagnosis is based on a constellation of pathognomonic findings: * **Rhinitis (Snuffles):** A highly infectious, blood-tinged mucopurulent discharge; often the earliest sign. * **Skin Lesions:** Palmoplantar bullae (Pemphigus syphiliticus) and wrinkled skin (due to intrauterine growth restriction) are characteristic. * **Abdominal Distension:** Typically due to hepatosplenomegaly. * **Obstetric History:** Recurrent abortions and stillbirths are hallmark indicators of untreated maternal syphilis. **Why the other options are incorrect:** * **Neonatal Pemphigus:** This is a rare transient condition caused by the placental transfer of maternal IgG antibodies (Pemphigus vulgaris). It presents with flaccid bullae but lacks systemic features like snuffles or hepatosplenomegaly. * **Scabies:** While it can cause vesicles and pustules in infants (including palms/soles), it does not cause rhinitis, SGA, or the specific obstetric history mentioned. * **Congenital HIV:** Usually asymptomatic at birth. Clinical features like lymphadenopathy and failure to thrive typically develop later in infancy. It does not cause palmoplantar blisters. **High-Yield Clinical Pearls for NEET-PG:** * **Hutchinson’s Triad (Late Syphilis):** Interstitial keratitis, Sensorineural hearing loss (8th nerve deafness), and Hutchinson’s teeth (notched incisors). * **Radiological Signs:** Wimberger’s sign (localized erosion of the medial proximal tibia) and periostitis. * **Screening/Diagnosis:** VDRL/RPR for screening; FTA-ABS or TP-PA for confirmation. * **Treatment of Choice:** Aqueous Crystalline Penicillin G.

Q: A premature baby of 34 weeks gestation was delivered and developed bullous lesions on the skin. Radiographs show periostitis. What should be the next investigation?

VDRL for mother and baby. The clinical presentation of a premature neonate with **bullous skin lesions** (Pemphigus syphiliticus) and **periostitis** is a classic triad for **Congenital Syphilis**. ### **Why Option A is Correct** Congenital syphilis is caused by the transplacental transmission of *Treponema pallidum*. * **Skin Lesions:** The characteristic rash often involves bullae or maculopapular lesions, typically on the palms and soles. * **Radiological Findings:** Bone involvement is seen in 90% of symptomatic infants. **Periostitis** and osteochondritis (e.g., Wimberger’s sign) are hallmark features. * **Diagnosis:** The initial screening step is performing non-treponemal tests (**VDRL or RPR**) on both the mother and the baby. A neonatal titer fourfold higher than the maternal titer is highly suggestive of infection. ### **Why Other Options are Incorrect** * **B (HIV):** While HIV can be transmitted vertically, it typically presents later with failure to thrive, lymphadenopathy, and opportunistic infections, not acute bullous lesions or periostitis. * **C (TB):** Congenital Tuberculosis usually presents with hepatosplenomegaly, respiratory distress, and fever; it does not cause bullous skin disease. * **D (Hepatitis B):** Neonatal Hep-B is usually asymptomatic at birth and is managed with vaccination and HBIG; it does not present with skeletal or dermatological abnormalities. ### **NEET-PG High-Yield Pearls** * **Early Congenital Syphilis ( 2 years):** Hutchinson’s triad (interstitial keratitis, sensorineural deafness, and Hutchinson’s teeth), Mulberry molars, and Sabre shin. * **Treatment of Choice:** Intravenous **Penicillin G** for 10 days.

Q: IUGR is characterized by all EXCEPT?

Hyaline membrane disease. **Explanation:** Intrauterine Growth Restriction (IUGR) occurs when a fetus does not reach its biological growth potential due to placental, maternal, or fetal factors. **Why Hyaline Membrane Disease (HMD) is the correct answer:** HMD, also known as Respiratory Distress Syndrome (RDS), is primarily a disease of **prematurity** caused by surfactant deficiency. In IUGR, the fetus undergoes chronic intrauterine stress. This stress triggers an increased release of **endogenous maternal and fetal glucocorticoids (cortisol)**, which accelerates fetal lung maturation and surfactant production. Consequently, IUGR infants actually have a **decreased risk** of HMD compared to non-IUGR infants of the same gestational age. **Analysis of Incorrect Options:** * **Polycythemia:** Chronic fetal hypoxia in IUGR stimulates erythropoietin production, leading to an increased red cell mass. * **Meconium Aspiration Syndrome (MAS):** Hypoxia-induced fetal distress causes the passage of meconium in utero and gasping movements, making MAS a common complication. * **Hypocalcemia:** This occurs due to reduced placental transfer of calcium and a transiently blunted parathyroid hormone response post-delivery. **High-Yield Clinical Pearls for NEET-PG:** * **Most common metabolic complication in IUGR:** Hypoglycemia (due to low glycogen stores and impaired gluconeogenesis). * **Ponderal Index:** Used to differentiate between Symmetrical and Asymmetrical IUGR. * **Asymmetrical IUGR:** Most common type; characterized by "Head Sparing" (normal head circumference but low birth weight). * **Other complications:** Hypothermia, Hyperviscosity syndrome, and Pulmonary hemorrhage.

Question 1

Arrange the following steps of handwashing, before entering a NICU, in proper sequence?

Accepted Answer

1 - 4 - 3 - 2

Answer

1 - 2 - 3 - 4

Answer

4 - 3 - 2 - 1

Answer

3 - 2 - 4 - 1

Question 2

What is the blood glucose level considered hyperglycemia in a neonate?

Accepted Answer

125 mg/dL

Answer

150 mg/dL

Answer

180 mg/dL

Answer

100 mg/dL

Question 3

Which of the following is best for the transport of a newborn while maintaining body temperature?

Accepted Answer

Kangaroo Mother Care (KMC)

Answer

Transport incubator

Answer

Thermacol box

Answer

Hot water bottle

Question 4

A neonate born at 34 weeks gestation with premature rupture of membranes undergoes a chest X-ray. Which of the following is LEAST likely to be considered in the differential diagnosis of the findings on the chest X-ray?

Accepted Answer

Ventricular septal defect

Answer

Congenital pneumonia

Answer

Hyaline membrane disease

Answer

Congenital alveolar proteinosis

Question 5

A 40-year-old man developed burning pain and paresthesias of his left scalp and forehead for 9 days. Three days later, he noted several papules on his scalp, followed the next day by more on his forehead over the left eyebrow and on his left upper eyelid. These evolved into small blisters on which crusts formed. As the older lesions became crusted, new papules appeared in the same general area. Examination revealed several erythematous papules, and groups of clear-fluid-filled vesicles with erythematous bases, and crusted papules in the left anterior scalp, forehead, and upper eyelid. The tip of the nose was spared. If this same condition affects a pregnant female in the 1st trimester, which of the following abnormalities can be seen in the newborn?

Accepted Answer

Cicatricial skin lesions

Answer

Sensorineural hearing loss

Answer

Macroopthalmia

Answer

Hyperpigmentation

Question 6

With reference to Respiratory Distress Syndrome (RDS), all of the following statements are true EXCEPT:

Accepted Answer

Is treated by administering 100% oxygen.

Answer

Usually occurs in infants born before 34 weeks of gestation.

Answer

Is more common in babies born to diabetic mothers.

Answer

Leads to cyanosis.

Question 7

A 28-year-old woman gave birth to a small for gestational age newborn at 38 weeks of pregnancy. On examination, the newborn was found to have rhinitis, a distended abdomen, wrinkled skin, and palmoplantar blisters. The woman had an earlier history of abortion and stillbirth. What is the most likely diagnosis?

Accepted Answer

Congenital syphilis

Answer

Neonatal pemphigus

Answer

Scabies

Answer

Congenital HIV infection

Question 8

Which of the following skin changes in a newborn disappear spontaneously?

Accepted Answer

All of the above

Answer

Harlequin skin change

Answer

Mongolian spots

Answer

Erythema toxicum

Question 9

A premature baby of 34 weeks gestation was delivered and developed bullous lesions on the skin. Radiographs show periostitis. What should be the next investigation?

Accepted Answer

VDRL for mother and baby

Answer

ELISA for HIV

Answer

PCR for TB

Answer

Hepatitis B surface antigen for mother

Question 10

IUGR is characterized by all EXCEPT?

Accepted Answer

Hyaline membrane disease

Answer

Polycythemia

Answer

Meconium aspiration syndrome

Answer

Hypocalcemia

Neonatology — MCQs

Neonatology — MCQs

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