Neonatology Practice Questions

Q: Differential cyanosis occurs in which of the following diseases:

PPHN. ***PPHN*** - **Persistent pulmonary hypertension of the newborn (PPHN)** is the **classic cause of differential cyanosis** in neonates. - High pulmonary vascular resistance leads to **suprasystemic pulmonary artery pressures**, causing **right-to-left shunting** across the **patent ductus arteriosus (PDA)**. - Desaturated blood from the pulmonary artery shunts into the **descending aorta** (post-ductal), perfusing the lower body and lower extremities with poorly oxygenated blood. - The upper extremities receive well-oxygenated blood from the **ascending aorta** (pre-ductal), resulting in **higher oxygen saturation in the right hand compared to the feet** (pre-ductal vs. post-ductal saturation difference >10%). - This is a **pathognomonic finding** in PPHN and helps differentiate it from cyanotic congenital heart disease. *Incorrect: Severe coarctation* - **Coarctation of the aorta** causes obstruction to blood flow, leading to **blood pressure differences** and **weak femoral pulses**, but does NOT primarily cause differential cyanosis. - While it may be associated with differential saturation in rare cases with severe pre-ductal coarctation and right-to-left ductal shunting, this is **not the typical presentation**. - The hallmark findings are **hypertension in upper extremities** and **hypotension in lower extremities**, not differential oxygenation. *Incorrect: Interrupted aortic arch* - While interrupted aortic arch relies on a **PDA for lower body perfusion**, the blood through the ductus is typically **well-oxygenated** unless there are associated complex cardiac defects causing desaturation. - The typical presentation is **poor perfusion and shock** rather than isolated differential cyanosis. - Differential cyanosis would only occur in specific anatomical variants with obligatory right-to-left shunting, which is not the standard presentation.

Q: Hypoglycemia in infants more than 24 hours of age is defined as blood glucose levels less than

45 mg/dl. ***45 mg/dl*** - Hypoglycemia in infants over 24 hours old is defined as a blood glucose level less than **45 mg/dL** due to their increased glucose demands and maturing metabolic systems. - Maintaining glucose levels above this threshold is crucial to prevent **neurodevelopmental injury** in vulnerable infants. *40 mg/dl* - While **40 mg/dL** might be considered critically low, the accepted threshold for hypoglycemia in infants >24 hours old is slightly higher to ensure a wider safety margin. - Using a lower value could delay intervention, potentially leading to **adverse neurological outcomes**. *50 mg/dl* - A blood glucose level of **50 mg/dL** is considered within the normal range for infants older than 24 hours and would not typically warrant intervention for hypoglycemia. - Setting the threshold too high could lead to **over-diagnosis** and unnecessary treatment. *55 mg/dl* - **55 mg/dL** is well above the clinically significant threshold for hypoglycemia in this age group and is generally considered a healthy blood glucose level. - Using this value as a diagnostic cutoff would result in a significant number of **false positives**.

Q: The mother of this newborn had fever with rash at 18 weeks of gestation. What is this baby probably suffering from?

Congenital Varicella. ***Congenital Varicella*** - Maternal chickenpox (fever with rash) during early to mid-pregnancy (13-20 weeks) can lead to **congenital varicella syndrome**. - This syndrome is characterized by **skin scarring**, limb hypoplasia, microcephaly, and **ocular abnormalities**. *Congenital Toxoplasmosis* - Maternal infection typically presents as **flu-like symptoms** or can be asymptomatic. - Classic triad in the infant includes **hydrocephalus**, **chorioretinitis**, and **intracranial calcifications**. *Congenital Rubella* - Maternal rubella infection often presents with a **maculopapular rash**, fever, and lymphadenopathy. - Congenital rubella syndrome is associated with **cataracts**, **sensorineural hearing loss**, and **cardiac defects** (e.g., patent ductus arteriosus). *Congenital CMV* - Maternal CMV infection is often **asymptomatic**, but can cause a mononucleosis-like illness. - Infants may present with **microcephaly**, **periventricular calcifications**, **jaundice**, and **hepatosplenomegaly**.

Q: Which of the following cardiac defects can be seen in Congenital Rubella Syndrome?

Conduction defect. ***Conduction defect*** - **Congenital Rubella Syndrome (CRS)** causes various **cardiac defects**, including **conduction abnormalities** such as **complete heart block** and **bundle branch blocks**. - These arise from the direct effect of the **rubella virus** on the developing fetal cardiac conduction system. - **Conduction defects** are well-recognized cardiac manifestations of CRS. *VSD* - **Ventricular Septal Defect (VSD)** **can indeed occur** in Congenital Rubella Syndrome and is documented in medical literature as one of the possible cardiac defects. - However, the **most characteristic and commonly emphasized cardiac defects** in CRS are **Patent Ductus Arteriosus (PDA)** - occurring in 60-70% of cases - and **Pulmonary Artery Stenosis/Branch Pulmonary Stenosis**. - While VSD is a recognized cardiac manifestation, **conduction defects** are more specifically highlighted in the context of CRS cardiac involvement in standard textbooks. *Microcephaly* - **Microcephaly** is a severe and common manifestation of **Congenital Rubella Syndrome**, but it is a **neurological defect**, **NOT a cardiac defect**. - This option tests whether candidates can differentiate between cardiac and non-cardiac manifestations. - Other common non-cardiac manifestations include **sensorineural hearing loss**, **cataracts**, and **intrauterine growth restriction**. *All of the options* - This option is **incorrect** because **Microcephaly** is a **neurological manifestation**, not a cardiac defect. - The question specifically asks for **cardiac defects** seen in the syndrome. - Both **Conduction defect** and **VSD** are cardiac manifestations, but only **Conduction defect** is marked as the answer, likely emphasizing the more specifically associated cardiac finding in CRS.

Q: The most characteristic manifestation of congenital toxoplasmosis is:

Intracranial calcifications. ***Intracranial calcifications*** - **Intracranial calcifications**, particularly scattered and diffuse throughout the brain parenchyma, are the most **characteristic and pathognomonic** finding of congenital toxoplasmosis - These calcifications result from the parasite's predilection for **neural tissue** and subsequent inflammatory necrosis - Along with **hydrocephalus** and **chorioretinitis**, they form the **classic triad** of congenital toxoplasmosis - The scattered pattern of calcifications helps differentiate toxoplasmosis from CMV (which causes periventricular calcifications) *Deafness* - **Sensorineural hearing loss** can occur but is not a characteristic feature of congenital toxoplasmosis - Deafness is more commonly associated with congenital **cytomegalovirus (CMV)** or **rubella** infection - When present in toxoplasmosis, it is typically a late sequela rather than a primary manifestation *Thrombocytopenia* - **Thrombocytopenia** may occur as part of generalized systemic involvement but is a **non-specific finding** - It can be seen in many congenital infections (TORCH complex) - Not diagnostically useful for distinguishing toxoplasmosis from other congenital infections *Hepatosplenomegaly* - **Hepatosplenomegaly** indicates systemic infection and may reflect **extramedullary hematopoiesis** - Common in many congenital infections, making it non-specific - The most **diagnostically valuable** findings in congenital toxoplasmosis are the neurological (intracranial calcifications, hydrocephalus) and ocular (chorioretinitis) manifestations

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.

Question 1

Differential cyanosis occurs in which of the following diseases:

Accepted Answer

PPHN

Answer

Severe coarctation

Answer

Interrupted aortic arch

Answer

All of the options

Question 2

Hypoglycemia in infants more than 24 hours of age is defined as blood glucose levels less than

Accepted Answer

45 mg/dl

Answer

40 mg/dl

Answer

50 mg/dl

Answer

55 mg/dl

Question 3

The mother of this newborn had fever with rash at 18 weeks of gestation. What is this baby probably suffering from?

Accepted Answer

Congenital Varicella

Answer

Congenital Toxoplasmosis

Answer

Congenital Rubella

Answer

Congenital CMV

Question 4

Which of the following cardiac defects can be seen in Congenital Rubella Syndrome?

Accepted Answer

Conduction defect

Answer

VSD

Answer

Microcephaly

Answer

All of the options

Question 5

The most characteristic manifestation of congenital toxoplasmosis is:

Accepted Answer

Intracranial calcifications

Answer

Deafness

Answer

Thrombocytopenia

Answer

Hepatosplenomegaly

Question 6

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 7

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

Accepted Answer

Sublimation

Answer

Conduction

Answer

Radiation

Answer

Convection

Question 8

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 9

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 10

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

Accepted Answer

150mg%

Answer

80mg%

Answer

100mg%

Answer

120mg%

Neonatology — MCQs

Neonatology — MCQs

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