Neonatology Practice Questions

Q: A new born boy is having lumbosacral meningomyelocele and awaiting the surgical repair. The sac is best protected with sterile gauze piece soaked with

Normal saline. ***Normal saline*** - **Normal saline** creates a moist environment, which prevents the delicate neural tissue within the **meningomyelocele sac** from drying out and sustaining further damage. - Using a sterile gauze soaked in normal saline also reduces the risk of infection by providing a clean barrier until surgical repair can be performed. - This is the **standard of care** for preoperative management of meningomyelocele. *Mercurochrome* - **Mercurochrome** contains mercury, which is highly toxic and can be absorbed through the delicate membranes of the meningomyelocele sac, causing systemic toxicity. - It is an antiseptic and not ideal for maintaining the delicate neural tissue's viability due to its potential for **chemical irritation** and damage. *Methylene blue* - **Methylene blue** is primarily used as a dye or for specific medical treatments, but it is not suitable for dressing a meningomyelocele due to its potential for irritation and lack of benefit in protecting neural tissue. - It does not provide the necessary hydration and protection for the exposed neural elements and may cause a **chemical burn** or local tissue damage. *Tincture benzoin* - **Tincture benzoin** is an adhesive protectant often used to improve adhesion of bandages or to protect skin, but it is **irritating** and not sterile. - It is definitely not indicated for direct application over exposed neural tissue as it can cause significant **chemical irritation** and inflammation.

Q: Which of the following is NOT a method by which incubator heat is delivered?

Sublimation. ***Sublimation*** - **Sublimation** is the process where a solid changes directly into a gas without passing through a liquid phase (e.g., dry ice sublimating). - This is a **phase transition of matter**, NOT a mechanism of heat transfer. - Incubators do not use sublimation as a method of heat delivery. - The three methods of heat transfer are conduction, convection, and radiation - all of which are used in modern incubators. *Conduction* - Incubators DO use **conduction** to deliver heat through direct contact. - Heat is transferred from the warmed mattress and surrounding surfaces to the infant's skin. - Modern incubators are designed to provide safe conductive heating without causing burns. *Radiation* - **Radiant warmers** use infrared radiation to directly warm the infant without heating the surrounding air. - This method is particularly effective for sick neonates requiring easy access during procedures. *Convection* - Incubators use **forced convection** by circulating warm, humidified air around the infant. - This ensures **uniform temperature distribution** and maintains a stable thermal environment.

Q: In infants of diabetic mothers (IDM), when is ophthalmologic evaluation indicated?

Only if visual symptoms develop. ***Only if visual symptoms develop*** - Unlike **retinopathy of prematurity**, infants of diabetic mothers (IDMs) do not have a higher incidence of **retinopathy** or other **ocular abnormalities** at birth or in early infancy. - **Ophthalmologic evaluation** is generally reserved for IDMs who develop specific **visual symptoms** or signs of ocular pathology. *At the time of diagnosis* - Routine ophthalmologic screening at the time of diagnosis of IDM is **not standard practice**, as the risk of **congenital ocular anomalies** is not substantially elevated to warrant universal screening. - Initial management focuses on metabolic stability, especially **glucose control**, and screening for other common IDM-related complications like **cardiac defects** or **respiratory distress**. *After 5 years routinely* - There is **no evidence or recommendation** for routine ophthalmologic screening of IDMs specifically at the age of 5 years. - Regular **well-child check-ups** include basic vision screening, which would identify significant refractive errors or strabismus, but not specifically for diabetes-related ocular issues. *After developing diabetes* - While it is true that individuals with **type 1 or type 2 diabetes** require regular **ophthalmologic evaluations** for **diabetic retinopathy**, this refers to the child developing diabetes later in life, not being an IDM. - Being an IDM is a **risk factor for developing diabetes** later in life, but it doesn't automatically mean they have diabetes-related ocular issues from birth.

Q: A newborn developed periventricular leukomalacia following ischemic infarction. What can be the most common sequelae in this child?

Spastic diplegia. ***Spastic diplegia*** - **Periventricular leukomalacia (PVL)** primarily damages the **white matter** adjacent to the ventricles, including descending motor tracts controlling leg movement. - This specific damage pattern often leads to **spasticity predominantly in the lower limbs**, characteristic of spastic diplegia. *Hypotonia* - While hypotonia may be present acutely in some hypoxic-ischemic injuries, it is not the **most common chronic sequela** of PVL. - PVL specifically damages **upper motor neuron pathways**, predominantly leading to spasticity rather than hypotonia in the long term. *Spastic quadriplegia* - Spastic quadriplegia implies **severe motor impairment** in all four limbs, usually resulting from more widespread or extensive brain damage. - PVL typically affects the motor tracts to the legs more severely, making spastic diplegia a more common and specific outcome. *Intellectual disability* - While **cognitive impairment** can be a complication of PVL, it is not the most common **motor sequela**. - **Motor disorders**, particularly spastic diplegia, are the hallmark clinical presentation following PVL.

Q: The normal concentration of protein in CSF at 4 weeks may be as high as-

150mg%. ***150mg%*** - In newborns and infants, the **blood-brain barrier** is not fully mature, leading to higher CSF protein levels than in adults. - At 4 weeks of age, CSF protein concentrations within the range of **100-170 mg/dL** (100-170 mg%) are considered normal. *80mg%* - While a normal CSF protein level for adults is typically **<45 mg/dL**, pediatric ranges are significantly higher. - **80 mg%** is lower than expected for a 4-week-old infant. *100mg%* - This value is at the **lower end of the normal range** for a 4-week-old infant. - While possible, it may reflect early maturation or be on the borderline. *120mg%* - This is within the normal limits, but the question asks for "as high as", implying the **upper limit of normal**. - **150mg%** better represents the potential maximum normal value at this age.

Q: A term infant is born to a known HIV-positive mother. She has been taking antiretroviral medications for the weeks prior to the delivery of her infant. Routine management of the healthy infant should include which of the following?

A course of zidovudine for the infant. ***A course of zidovudine for the infant*** - This is the standard of care for newborns exposed to HIV prenatally, even if the mother received **antiretroviral therapy (ART)**. - **Zidovudine (AZT)** prophylaxis significantly reduces the risk of **perinatal HIV transmission**. *HIV ELISA on the infant to determine if congenital infection has occurred* - **HIV ELISA** tests detect **maternal antibodies** passed to the infant, which can persist for up to 18 months, leading to **false positive results**. - **HIV DNA PCR** or **RNA assays** are used to diagnose HIV infection in infants. *Admission to the neonatal intensive care unit for close cardiovascular monitoring* - Admission to the **NICU** is generally reserved for **premature** or **symptomatic infants**, or those with specific complications. - A **healthy, term infant** born to an HIV-positive mother on ART does not routinely require NICU admission. *Chest radiographs to evaluate for congenital Pneumocystis carinii* - **Pneumocystis jirovecii pneumonia (PJP)** typically presents in HIV-infected infants between **3 to 6 months of age**, not at birth. - Prophylaxis with **trimethoprim-sulfamethoxazole (TMP-SMX)** is initiated at 4-6 weeks of age for HIV-exposed infants.

Q: Estimation of the blood sugar is relevant in all except –

Baby of hypothyroid mother. ***Baby of hypothyroid mother*** - While maternal hypothyroidism can affect fetal development and lead to various complications, it does not directly cause **neonatal hypoglycemia** or **hyperglycemia**, making routine blood sugar monitoring less critical unless other risk factors are present. - The primary concerns for a baby born to a hypothyroid mother are related to thyroid function itself, such as **congenital hypothyroidism**, not blood glucose dysregulation. *Large for date baby* - **Macrosomic infants**, especially those born to mothers with gestational diabetes, are at increased risk for **hypoglycemia** due to chronic fetal hyperinsulinemia. - Close monitoring of blood glucose levels is essential to prevent neurological damage from sustained low sugar. *Birth asphyxia* - Infants who experience **birth asphyxia** are under significant stress, which can deplete their glycogen stores and impair gluconeogenesis, leading to **hypoglycemia**. - Monitoring blood glucose is a critical component of their post-resuscitation care and management. *Rh Incompatibility* - Severe **Rh incompatibility** can lead to **hydrops fetalis** and other complications, including liver dysfunction and extramedullary hematopoiesis, which can impair glucose regulation. - These infants are at risk for both **hypoglycemia** due to increased metabolic demand and **hyperglycemia** secondary to stress and liver involvement, necessitating blood sugar monitoring.

Q: Which of the following is the most common congenital viral infection?

Cytomegalovirus. ***Cytomegalovirus*** - **Cytomegalovirus (CMV)** is the most prevalent congenital viral infection, with an incidence of 0.2-2% of all live births. - While many infected infants are asymptomatic at birth, up to **10-15% develop neurological sequelae**, such as sensorineural hearing loss, developmental delay, or microcephaly. *Herpes simplex* - **Congenital herpes simplex virus (HSV)** infection is rare, usually acquired during passage through an infected birth canal. - It typically presents with **skin lesions, encephalitis, or disseminated disease** rather than being the most common congenital infection overall. *HIV* - **Perinatal HIV transmission** has significantly decreased due to widespread screening and effective antiretroviral therapy during pregnancy. - While it was a major concern historically, its incidence is now lower than CMV, and it affects the **immune system** primarily. *Rubella* - **Congenital rubella syndrome (CRS)** can lead to severe birth defects, but its incidence has drastically reduced due to the widespread implementation of the **MMR vaccine**. - While devastating, it is no longer the most common congenital viral infection due to successful vaccination programs.

Q: Most common cause of neonatal diarrhea worldwide is:

Rotavirus. ***Rotavirus*** - **Rotavirus** is the **most common cause of severe acute diarrhea in infants and young children worldwide**, including the neonatal period. - It is responsible for significant morbidity and mortality, particularly in **developing countries** with limited access to clean water and sanitation. - The virus causes **watery diarrhea, vomiting, and dehydration**, which can be life-threatening in neonates. - **WHO** recognizes Rotavirus as the leading cause of severe diarrheal disease in children under 5 years globally. - Vaccination programs (Rotavac, Rotarix) have reduced incidence but it remains the predominant pathogen. *E. coli* - **Enteropathogenic E. coli (EPEC)** and **Enterotoxigenic E. coli (ETEC)** are important causes of neonatal diarrhea, especially in resource-limited settings. - EPEC causes diarrhea through attachment and effacement of intestinal mucosa. - ETEC is a major cause of traveler's diarrhea and endemic diarrhea in developing countries. - While significant, E. coli is the **most common bacterial cause** but not the overall most common cause when viruses are included. *Salmonella* - **Salmonella** causes gastroenteritis but is more common in **older infants and children**. - Often associated with **foodborne outbreaks**, fever, and sometimes bloody diarrhea. - Less frequent as a primary cause of neonatal diarrhea compared to Rotavirus or E. coli. *Shigella* - **Shigella** typically causes **dysentery (bloody diarrhea)** and is more common in **children over 6 months**. - Requires a lower infectious dose but is less prevalent in the immediate neonatal period. - Associated with poor hygiene and fecal-oral transmission in older children.

Q: What is the volume of reservoir bag used in neonatal resuscitation?

500 ml. ***500 ml*** - A **500 mL self-inflating bag** is the **standard size** recommended for **neonatal resuscitation** by the Neonatal Resuscitation Program (NRP). - This volume provides an adequate **oxygen reservoir** while allowing controlled delivery of appropriate **tidal volumes (4-6 mL/kg)** for neonates. - The bag volume is larger than the delivered tidal volume to ensure consistent oxygen concentration and effective ventilation without requiring perfect compression technique. *1000 ml* - A **1000 mL bag** is designed for **adult resuscitation** and is unnecessarily large for neonatal use. - While it can be used if neonatal bags are unavailable, the larger size makes it more difficult to achieve consistent, controlled ventilation in neonates. *750 ml* - A **750 mL bag** is sometimes used for older infants or pediatric patients but is larger than the standard neonatal size. - While acceptable, the **500 mL bag** is preferred for term and preterm neonates. *240 ml* - A **240 mL bag** is **too small** to function effectively as a self-inflating bag for neonatal resuscitation. - This volume is insufficient to maintain an adequate **oxygen reservoir** and would compromise the ability to deliver consistent positive pressure ventilation.

Question 1

A new born boy is having lumbosacral meningomyelocele and awaiting the surgical repair. The sac is best protected with sterile gauze piece soaked with

Accepted Answer

Normal saline

Answer

Mercurochrome

Answer

Methylene blue

Answer

Tincture benzoin

Question 2

Which of the following is NOT a method by which incubator heat is delivered?

Accepted Answer

Sublimation

Answer

Conduction

Answer

Radiation

Answer

Convection

Question 3

In infants of diabetic mothers (IDM), when is ophthalmologic evaluation indicated?

Accepted Answer

Only if visual symptoms develop

Answer

At the time of diagnosis

Answer

After 5 years routinely

Answer

After developing diabetes

Question 4

A newborn developed periventricular leukomalacia following ischemic infarction. What can be the most common sequelae in this child?

Accepted Answer

Spastic diplegia

Answer

Hypotonia

Answer

Spastic quadriplegia

Answer

Intellectual disability

Question 5

The normal concentration of protein in CSF at 4 weeks may be as high as-

Accepted Answer

150mg%

Answer

80mg%

Answer

100mg%

Answer

120mg%

Question 6

A term infant is born to a known HIV-positive mother. She has been taking antiretroviral medications for the weeks prior to the delivery of her infant. Routine management of the healthy infant should include which of the following?

Accepted Answer

A course of zidovudine for the infant

Answer

HIV ELISA on the infant to determine if congenital infection has occurred

Answer

Admission to the neonatal intensive care unit for close cardiovascular monitoring

Answer

Chest radiographs to evaluate for congenital Pneumocystis carinii

Question 7

Estimation of the blood sugar is relevant in all except –

Accepted Answer

Baby of hypothyroid mother

Answer

Large for date baby

Answer

Birth asphyxia

Answer

Rh Incompatibility

Question 8

Which of the following is the most common congenital viral infection?

Accepted Answer

Cytomegalovirus

Answer

Herpes simplex

Answer

HIV

Answer

Rubella

Question 9

Most common cause of neonatal diarrhea worldwide is:

Accepted Answer

Rotavirus

Answer

E. coli

Answer

Salmonella

Answer

Shigella

Question 10

What is the volume of reservoir bag used in neonatal resuscitation?

Accepted Answer

500 ml

Answer

1000 ml

Answer

750 ml

Answer

240 ml

Neonatology — MCQs

Neonatology — MCQs

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