Neonatology Practice Questions

Q: In a newborn, cold stress implies:

36 - 36.4 °C. ***36 - 36.4 °C*** - **Cold stress** in a newborn is defined as a core body temperature between **36.0 °C and 36.4 °C** according to WHO classification. - At this temperature, the newborn begins to expend energy to maintain body heat through mechanisms like non-shivering thermogenesis, indicating physiological stress due to environmental cooling. - Requires warming interventions such as **kangaroo mother care**, warm blankets, or radiant warmers. *35 - 35.4 °C* - This temperature range indicates **moderate hypothermia** (32-35.9°C range), a more severe condition than cold stress. - The body's compensatory mechanisms are often overwhelmed, requiring more aggressive warming interventions. - Carries higher risk of complications like **metabolic acidosis**, **hypoglycemia**, and **respiratory distress**. *34 - 34.6 °C* - This temperature range also falls under **moderate hypothermia** (32-35.9°C according to WHO classification). - Requires immediate warming measures and close monitoring for metabolic derangements. - Associated with increased risk of complications including **coagulopathy**, **pulmonary hypertension**, and **shock**. *37 - 37.6 °C* - This temperature range is considered **normal** (36.5-37.5°C), indicating that the newborn is adequately warm and not experiencing cold stress. - The newborn maintains thermal homeostasis without excessive energy expenditure for heat production.

Q: A child born with microcephaly, chorioretinitis, and intracranial calcification. Most likely diagnosis is:

Toxoplasmosis. ***Toxoplasmosis*** - The classic triad of **chorioretinitis**, **hydrocephalus** (or microcephaly), and **intracranial calcifications** is a hallmark of congenital toxoplasmosis. - **Intracranial calcifications** in toxoplasmosis are characteristically **diffuse and scattered** throughout the brain parenchyma (unlike CMV which causes periventricular calcifications). - **Microcephaly** results from central nervous system damage and inflammation. - Other features may include seizures, hepatosplenomegaly, and jaundice. *Congenital syphilis* - Characterized by manifestations such as **hepatosplenomegaly**, **bone abnormalities** (e.g., osteochondritis), rash, and rhinitis. - While it can cause CNS involvement, the specific triad of chorioretinitis and intracranial calcifications is not typical. *Rubella* - The classic congenital rubella syndrome triad includes **sensorineural hearing loss**, ocular defects (e.g., **cataracts**, **glaucoma**), and **congenital heart defects** (e.g., patent ductus arteriosus, pulmonary artery stenosis). - Although it can cause microcephaly, chorioretinitis and prominent intracranial calcifications are not characteristic features. *Trypanosomiasis* - Congenital trypanosomiasis (e.g., Chagas disease) can cause **cardiomyopathy**, **megaviscera** (megaesophagus, megacolon), and neurological symptoms. - It does not typically present with the described triad of chorioretinitis and intracranial calcifications.

Q: All are features of neonatal tetanus except which of the following?

Onset is usually within 24 hours of birth. ***Onset is usually within 24 hours of birth*** - This is **INCORRECT** and is the exception among the options. - **Neonatal tetanus** typically presents between **3 to 14 days of life**, with most cases occurring around **day 7**. - The **incubation period** is needed for bacterial colonization at the umbilical stump and sufficient toxin production. - Onset within 24 hours would be extremely rare and inconsistent with the typical pathophysiology. *Caused by clostridium tetani* - This is a **correct feature** of neonatal tetanus. - The causative organism is **_Clostridium tetani_**, which produces the neurotoxin **tetanospasmin**. - The organism typically enters through the **umbilical stump** during unhygienic cord cutting or care practices. *Mortality is 50–75%* - This is a **correct feature** of neonatal tetanus. - The mortality rate is indeed very high, ranging from **50% to 75%** even with intensive care. - High mortality is due to severe **muscle spasms**, **respiratory failure**, and **autonomic dysfunction**. *Usually occurs after the first 2 days of life* - This is a **correct feature** of neonatal tetanus. - The condition typically manifests after **day 3**, with peak incidence around **day 7 of life**. - This timing reflects the **incubation period** required for bacterial growth and toxin production at the umbilical site.

Q: Primary complex in the liver in congenital tuberculosis occurs through?

Haematogenous Spread. ***Haematogenous Spread*** - In **congenital tuberculosis**, the most common route of infection is **transplacental** via the umbilical vein, leading to **haematogenous spread** directly to the fetal liver. - The fetal liver acts as the **first filter** for these blood-borne bacilli, resulting in the formation of a **primary complex** there. *Lymphatic Spread* - While lymphatic spread is crucial in adult TB, it is typically secondary to an initial focus and occurs via **lymph nodes**, rather than being the primary route for liver involvement in congenital cases. - In congenital tuberculosis, the initial dissemination to the liver is almost exclusively via the **bloodstream**, bypassing the typical lymphatic drainage pathway for primary infection. *Ingestion of Infected Amniotic Fluid* - Ingestion of infected amniotic fluid would primarily affect the **gastrointestinal tract**, leading to primary lesions in the intestines or associated mesenteric lymph nodes, not the liver. - For the liver to be involved via ingestion, there would need to be a subsequent **haematogenous dissemination** from the gut, which is a less direct route than transplacental spread. *Aspiration of Infected Amniotic Fluid* - Aspiration of infected amniotic fluid would primarily cause **pulmonary involvement** in the fetus, leading to congenital pneumonia or primary complexes in the lungs. - This route does not directly account for the presence of a primary complex specifically in the **liver** as the initial site of infection.

Q: Which of the following is an effective sign of successful neonatal resuscitation?

Increased heart rate. ***Increased heart rate*** - A definitive increase in **heart rate** (typically above 100 bpm) is the most critical and rapid indicator of effective neonatal resuscitation, signifying improved oxygenation and cardiac output. - The goal of neonatal resuscitation is to establish effective ventilation, which subsequently leads to an improved heart rate. *Change in skin color* - **Skin color** changes, while reassuring, are often a delayed and less reliable indicator of immediate resuscitation success compared to heart rate. - Peripheral cyanosis can persist even with adequate central oxygenation, making it a subjective and less sensitive marker. *Presence of air entry* - While **air entry** into the lungs is essential for effective ventilation, merely hearing breath sounds does not guarantee sufficient oxygen exchange or circulatory improvement. - Air entry can be present even with ineffective ventilation (e.g., inadequate tidal volume or airway obstruction), and it doesn't directly measure the systemic response. *None of the options* - This option is incorrect because **increased heart rate** is indeed a primary and immediate sign of successful neonatal resuscitation.

Q: Which of the following is the most important associated finding with apnea in a preterm baby?

Associated with bradycardia. ***Associated with bradycardia*** - Apnea of prematurity is defined by a cessation of breathing lasting more than 20 seconds, or a shorter pause accompanied by **bradycardia** (heart rate <100 bpm) or **cyanosis**. - **Bradycardia** is the most consistent and clinically significant associated finding with apneic spells in preterm infants, indicating cardiorespiratory compromise. - Bradycardia often occurs early and serves as a critical monitoring parameter for detecting and managing apneic episodes. *Leads to hypoxia* - While apnea can lead to **hypoxia** (decreased oxygen saturation), this is a consequence of prolonged apneic episodes. - Hypoxia develops more gradually, whereas **bradycardia** is an immediate physiological response that alerts clinicians to intervene. *May cause cyanosis* - **Cyanosis** (bluish discoloration due to deoxygenated hemoglobin) is an important clinical sign of severe apnea. - However, cyanosis typically appears after hypoxia has developed, making **bradycardia** a more sensitive and earlier indicator for clinical monitoring. *Cessation of breathing for more than 20 seconds* - This is the **primary defining feature** of apnea of prematurity itself. - However, the question asks for the most important **associated finding** rather than the definition, making **bradycardia** the key clinical parameter that determines the severity and need for intervention.

Q: Features of periostitis on X-ray of the hip in a child suggest

Syphilis. ***Syphilis*** - **Congenital syphilis** is known to cause **periostitis**, especially in long bones, which can be visualized on X-rays as new bone formation. - Features often include **widespread bony lesions**, including periosteal thickening, osteitis, and metaphysitis due to the systemic nature of the infection. *Toxoplasma (affects CNS and eyes)* - **Congenital toxoplasmosis** primarily affects the **central nervous system** (e.g., hydrocephalus, intracranial calcifications) and eyes (e.g., chorioretinitis). - It does not typically cause **periostitis** or bony changes visible on X-ray of the hip. *CMV (typically leads to systemic disease)* - **Congenital cytomegalovirus (CMV)** infection often presents with **systemic manifestations** like hepatosplenomegaly, thrombocytopenia, and neurological deficits. - While CMV can cause **bony lesions** in severe cases, classical periostitis, especially as a prominent isolated feature on hip X-ray, is not characteristic. *Rubella (primarily causes cardiac and ocular abnormalities)* - **Congenital rubella syndrome** classically involves a triad of **cardiac defects** (e.g., patent ductus arteriosus), **ocular abnormalities** (e.g., cataracts, glaucoma), and **sensorineural hearing loss**. - While it can cause some bone lesions (e.g., "celery stalk" appearance in metaphyses), **periostitis** of the hip is not a primary or common finding associated with rubella.

Q: Which of the following is NOT an essential criterion for diagnosing perinatal asphyxia?

Prolonged metabolic alkalosis. ***Prolonged metabolic alkalosis*** - This is **NOT** an essential criterion for diagnosing perinatal asphyxia because asphyxia causes the opposite condition — **metabolic acidosis**, not alkalosis. - During oxygen deprivation, anaerobic metabolism produces lactic acid, leading to **acidosis** (low pH, high lactate). - **Metabolic alkalosis** (excess bicarbonate or loss of acids) is incompatible with the hypoxic-ischemic insult of asphyxia. *Persistence of Apgar score of 0-3 for >5 min* - A **persistently low Apgar score** (0-3 for more than 5 minutes) is a strong indicator of perinatal asphyxia and is one of the **essential criteria**. - It reflects severe cardiorespiratory depression and the infant's inability to establish effective breathing and circulation. *Hypoxic ischemic encephalopathy (HIE) in the immediate neonatal period* - The development of **HIE** is a direct and severe consequence of perinatal asphyxia, signifying brain damage due to lack of oxygen and blood flow. - This is a **critical diagnostic criterion**, as it indicates significant neurological impact from the asphyxial event. *Evidence of multiorgan dysfunction in the immediate neonatal period* - Asphyxia can lead to widespread tissue damage due to oxygen deprivation, affecting organs like the kidneys, heart, lungs, and liver, in addition to the brain. - **Multiorgan dysfunction** is a **key essential criterion** that supports the diagnosis of severe perinatal asphyxia.

Question 1

In a newborn, cold stress implies:

Accepted Answer

36 - 36.4 °C

Answer

37 - 37.6 °C

Answer

34 - 34.6 °C

Answer

35 - 35.4 °C

Question 2

A child born with microcephaly, chorioretinitis, and intracranial calcification. Most likely diagnosis is:

Accepted Answer

Toxoplasmosis

Answer

Congenital syphilis

Answer

Rubella

Answer

Trypanosomiasis

Question 3

All are features of neonatal tetanus except which of the following?

Accepted Answer

Onset is usually within 24 hours of birth

Answer

Caused by clostridium tetani

Answer

Usually occurs after the first 2 days of life.

Answer

Mortality is 50–75%.

Question 4

Which of the following statements is MOST accurate regarding neonatal sepsis?

Accepted Answer

Fever can occur in neonatal sepsis but is not always present.

Answer

Meningitis is a late complication of sepsis.

Answer

Jaundice is a possible symptom of neonatal sepsis but not definitive.

Answer

None of the options.

Question 5

Primary complex in the liver in congenital tuberculosis occurs through?

Accepted Answer

Haematogenous Spread

Answer

Ingestion of Infected Amniotic Fluid

Answer

Lymphatic Spread

Answer

Aspiration of Infected Amniotic Fluid

Question 6

Which of the following is an effective sign of successful neonatal resuscitation?

Accepted Answer

Increased heart rate

Answer

Change in skin color

Answer

Presence of air entry

Answer

None of the options

Question 7

Which of the following is the most important associated finding with apnea in a preterm baby?

Accepted Answer

Associated with bradycardia

Answer

Leads to hypoxia

Answer

May cause cyanosis

Answer

Cessation of breathing for more than 20 seconds

Question 8

Features of periostitis on X-ray of the hip in a child suggest

Accepted Answer

Syphilis

Answer

Toxoplasma

Answer

CMV

Answer

Rubella

Question 9

Which of the following is NOT an essential criterion for diagnosing perinatal asphyxia?

Accepted Answer

Prolonged metabolic alkalosis

Answer

Hypoxic ischemic encephalopathy (HIE) in the immediate neonatal period

Answer

Evidence of multiorgan dysfunction in the immediate neonatal period

Answer

Persistence of Apgar score of 0-3 for >5 min

Question 10

Which one of the following statements about transient tachypnea of the newborn (TTNB) is correct?

Accepted Answer

Onset of respiratory distress is immediately after birth and it rarely lasts beyond 48 hours

Answer

It is the commonest respiratory disorder in newborns.

Answer

It is usually self-limiting and resolves within 72 hours.

Answer

It can be associated with other respiratory conditions.

Neonatology — MCQs

Neonatology — MCQs

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