Perinatal Asphyxia — MCQs

10 questions

Hypothermia is used in all except:

A preterm infant with poor respiration at birth starts throwing seizures at 10 hours after birth. Antiepileptic of choice shall be:

What does perinatal mortality include?

Apgar score less than 3 at 5 minutes of life is a predictor of:

A 3.8 kg baby of a diabetic mother developed seizures 32 hours after birth. The most probable cause would be?

What is the most common cause of seizure in a newborn?

An unconscious child is brought to the casualty. What is the correct sequence of the management?

Most common cause of convulsion on the first day of life in a newborn is:

A 37-week small-for-date neonate is most likely to develop

Q10

Management of typical febrile seizures includes all except:

Perinatal Asphyxia Indian Medical PG Practice Questions and MCQs

Question 1: Hypothermia is used in all except:

A. Hyperthermia
B. Arrhythmia (Correct Answer)
C. Neonatal asphyxia
D. Cardiac surgery

Explanation: ***Arrhythmia*** - While sometimes used in specific cardiac procedures or to protect organs during cardioplegia, **therapeutic hypothermia** is not a primary treatment for general cardiac arrhythmias due to its potential to exacerbate certain rhythm disturbances. - **Hypothermia** can paradoxically induce **arrhythmias** itself, particularly bradycardia and ventricular fibrillation, making it unsuitable for general arrhythmia management [1]. *Hyperthermia* - **Therapeutic hypothermia** is used to reduce high body temperatures in conditions like **malignant hyperthermia** and **heatstroke** to prevent organ damage [2]. - By actively cooling the body, hypothermia counteracts the harmful effects of sustained, extreme elevations in body temperature. *Neonatal asphyxia* - **Therapeutic hypothermia** is a standard treatment for **neonatal hypoxic-ischemic encephalopathy** (HIE) to reduce brain injury. - Cooling the infant's body temperature helps to slow down damaging metabolic processes after oxygen deprivation. *Cardiac surgery* - **Hypothermia** is commonly employed during **cardiac surgery** to protect organs, especially the brain and heart, from ischemia during periods of reduced blood flow. - **Moderate to deep hypothermia** can significantly reduce metabolic demands, extending the safe duration of cardiopulmonary bypass and aortic cross-clamping [3].

Question 2: A preterm infant with poor respiration at birth starts throwing seizures at 10 hours after birth. Antiepileptic of choice shall be:

A. Phenobarbitone (Correct Answer)
B. Lorazepam
C. Levetiracetam
D. Phenytoin

Explanation: ***Phenobarbitone*** - **Phenobarbitone** is the **first-line antiepileptic drug** recommended for neonatal seizures due to its established efficacy and safety profile in this population. - It acts primarily by **potentiating GABAA receptor-mediated chloride currents**, leading to central nervous system depression and seizure control. *Lorazepam* - While **benzodiazepines** like lorazepam can be used for acute seizure cessation, especially status epilepticus, they are generally **not the first-line choice for maintenance therapy** due to potential sedation and respiratory depression in neonates. - Its short duration of action and risk of rebound seizures make it less suitable as a sole agent for ongoing seizure control. *Levetiracetam* - **Levetiracetam** is an increasingly common antiepileptic in neonates, but its long-term efficacy and safety, particularly regarding neurodevelopmental outcomes, are **still under investigation** compared to phenobarbitone. - While it may be used as a second-line agent or in specific situations, it is **not universally considered the first-line drug of choice** for neonatal seizures. *Phenytoin* - **Phenytoin** is typically considered a **second-line or third-line antiepileptic** for neonatal seizures, primarily used if phenobarbitone is ineffective. - Its use is limited by potential side effects such as **cardiac arrhythmias, hypotension, and infiltration at the injection site**, which can be particularly concerning in premature infants.

Question 3: What does perinatal mortality include?

A. Deaths after 28 weeks of gestation
B. Deaths within the first 7 days after birth
C. From the period of viability
D. Both late fetal deaths and early neonatal deaths (Correct Answer)

Explanation: ***Both late fetal deaths and early neonatal deaths*** - Perinatal mortality encompasses deaths occurring both in the **late fetal period** (typically after 20-22 weeks of gestation, or commonly defined as 28 weeks or more) and during the **early neonatal period** (the first 7 days of life). - This broad definition helps to capture mortality related to conditions around the time of birth, including those stemming from **pregnancy complications**, labor, delivery, and immediate postnatal adaptation. *Deaths after 28 weeks of gestation* - This describes **late fetal deaths** (stillbirths) but does not include deaths that occur after birth, thus only covering a part of perinatal mortality. - Perinatal mortality is a broader measure that combines both stillbirths and early infant deaths. *Deaths within the first 7 days after birth* - This specifically defines **early neonatal deaths**, which are a component of perinatal mortality, but it excludes fetal deaths. - Perinatal mortality aims to assess factors impacting survival around the time of birth, both before and immediately after. *From the period of viability* - The period of viability refers to when a fetus can survive outside the uterus, which varies (often cited as 20-24 weeks), and would include very premature fetuses, but it isn't an explicit definition of perinatal mortality itself. - This term describes when a fetus is considered potentially viable but does not define the specific timeframe or types of deaths included in perinatal mortality.

Question 4: Apgar score less than 3 at 5 minutes of life is a predictor of:

A. Poor neurological outcome (Correct Answer)
B. Increased risk of neonatal mortality
C. Risk of cerebral palsy
D. Neonatal depression

Explanation: ***Poor neurological outcome*** - An **Apgar score less than 3 at 5 minutes** is a **strong predictor of adverse neurological outcomes** in the neonatal period and beyond. - According to **AAP and ACOG guidelines**, a 5-minute Apgar score of 0-3 is specifically associated with increased risk of **neonatal encephalopathy**, **seizures**, and **long-term neurological disability**. - **Persistent low scores** at 10, 15, or 20 minutes further increase the specificity for **cerebral palsy** and severe neurological impairment. - This is the **primary clinical significance** of a persistently low Apgar score at 5 minutes. *Increased risk of neonatal mortality* - While there is some association with mortality, the Apgar score was **not designed as a mortality predictor**. - With modern neonatal resuscitation and intensive care, many infants with low Apgar scores **survive**, making mortality a less specific outcome. - The score is more accurately a predictor of **need for resuscitation** and **neurological morbidity** rather than mortality alone. *Risk of cerebral palsy* - A 5-minute Apgar score <3 does increase the risk of cerebral palsy, but this is **not specific enough** in isolation. - **Cerebral palsy** requires multiple criteria: low Apgar scores **persisting beyond 10 minutes**, neonatal encephalopathy, and neuroimaging evidence. - A single 5-minute score alone is **insufficient** to predict cerebral palsy definitively. *Neonatal depression* - **Neonatal depression** describes the infant's **current state** at the time of assessment (low Apgar indicates depression at that moment). - The question asks what the low score **predicts** (future outcomes), not what it **indicates** or **reflects** at the moment of measurement. - This is a **descriptive term** for the immediate condition, not a predicted outcome.

Question 5: A 3.8 kg baby of a diabetic mother developed seizures 32 hours after birth. The most probable cause would be?

A. Hypoglycemia
B. Hypocalcemia (Correct Answer)
C. Birth asphyxia
D. Intraventricular hemorrhage

Explanation: ***Hypocalcemia*** - In infants of diabetic mothers (IDM), hypocalcemia typically presents at **24-72 hours of life**, making it the most probable cause of seizures at 32 hours. - The mechanism involves **functional hypoparathyroidism** secondary to maternal hyperparathyroidism and **hypomagnesemia**, which impairs parathyroid hormone secretion and action. - IDMs have increased metabolic demands and altered calcium homeostasis due to intrauterine metabolic disturbances. - **Timing is key**: The presentation at 32 hours strongly favors hypocalcemia over hypoglycemia in the differential diagnosis. *Hypoglycemia* - While hypoglycemia is indeed common in IDMs due to **fetal hyperinsulinemia**, it typically occurs much earlier—within the **first 2-24 hours of life** (peak at 1-3 hours). - By 32 hours, hypoglycemia would usually have been detected through routine monitoring or would have manifested earlier with symptoms. - Neonatal hypoglycemia causes seizures, but the **timing in this case makes it less likely** than hypocalcemia. *Birth asphyxia* - Birth asphyxia leads to hypoxic-ischemic encephalopathy with seizures typically presenting within the **first 12-24 hours**. - Would be accompanied by other neurological signs like hypotonia, altered consciousness, and poor feeding from birth. - No history suggesting birth complications is provided in the scenario. *Intraventricular hemorrhage* - IVH is primarily a complication of **prematurity**, particularly in very low birth weight infants. - This 3.8 kg baby is likely term or large-for-gestational-age, making IVH uncommon unless significant birth trauma occurred. - IVH presents with acute neurological deterioration, bulging fontanelle, and altered consciousness—not mentioned here.

Question 6: What is the most common cause of seizure in a newborn?

A. Hypoxic-ischemic encephalopathy (Correct Answer)
B. Hypocalcemia
C. Metabolic abnormality
D. Sepsis

Explanation: ***Hypoxic-ischemic encephalopathy*** - This is the **most frequent etiology** of neonatal seizures, particularly in **full-term infants**, due to perinatal events leading to brain injury. - Seizures often manifest within the **first 24-48 hours** of life and can range from subtle to generalized tonic-clonic. *Hypocalcemia* - While a notable cause, **hypocalcemia** is less common than hypoxic-ischemic encephalopathy as the primary cause of neonatal seizures. - Seizures due to hypocalcemia typically appear later, often around **3-7 days of life**, and can be accompanied by jitteriness and apneic spells. *Metabolic abnormality* - Various **inborn errors of metabolism** can cause neonatal seizures, but collectively they are less common than hypoxic-ischemic encephalopathy. - These seizures may be accompanied by other systemic symptoms like **lethargy, feeding difficulties, and organ dysfunction**. *Sepsis* - **Neonatal sepsis** can lead to seizures, often as a complication of central nervous system infection (meningitis) or metabolic derangements. - While serious, sepsis is proportionally **less common** as the sole primary cause compared to hypoxic-ischemic encephalopathy.

Question 7: An unconscious child is brought to the casualty. What is the correct sequence of the management?

A. Circulation, Airway, Breathing
B. Breathing, Circulation, Airway
C. Circulation, Breathing, Airway
D. Airway, Breathing, Circulation (Correct Answer)

Explanation: ***Airway, Breathing, Circulation*** - The **ABC sequence** is the cornerstone of pediatric resuscitation as per **PALS (Pediatric Advanced Life Support) guidelines** - In an unconscious child, a patent **airway** is the absolute first priority - without this, no oxygen can reach the lungs regardless of breathing effort - Once airway patency is ensured, **breathing** must be assessed and supported to provide adequate ventilation and oxygenation - Only after securing airway and breathing should **circulation** be addressed, as effective circulation without oxygenation is futile - This sequence prevents **hypoxic brain injury**, which can occur within 4-6 minutes of oxygen deprivation *Circulation, Airway, Breathing* - This violates the fundamental **ABC principle** of emergency management - Prioritizing **circulation** before establishing a patent **airway** means attempting to circulate deoxygenated blood - Without airway patency, any circulatory support will fail to deliver oxygen to vital organs, leading to **irreversible hypoxic damage** - In pediatric emergencies, respiratory failure is more common than primary cardiac arrest, making airway management even more critical *Breathing, Circulation, Airway* - Attempting to support **breathing** before securing the **airway** is physiologically ineffective - An obstructed airway prevents air entry despite breathing efforts or bag-mask ventilation attempts - This sequence can lead to **gastric distension, aspiration**, and worsening hypoxia - Delays in airway management increase the risk of **cardiac arrest** from prolonged hypoxemia *Circulation, Breathing, Airway* - This sequence dangerously delays **airway management**, the most time-critical intervention - In an unconscious child, airway obstruction from tongue falling back or secretions is common and immediately life-threatening - Without a patent airway, neither breathing support nor circulatory measures can prevent **brain death** from anoxia - Following this sequence contradicts all **international resuscitation guidelines** (PALS, AHA, ERC)

Question 8: Most common cause of convulsion on the first day of life in a newborn is:

A. Perinatal asphyxia (Correct Answer)
B. Hypoglycemia
C. Hypocalcemia
D. Head injury

Explanation: ***Perinatal asphyxia*** - **Perinatal asphyxia** (hypoxic-ischemic encephalopathy) is the most common cause of seizures in the first 24 hours of life in neonates. - The resulting **cerebral injury** from oxygen deprivation and ischemia leads to neuronal excitability and seizure activity. - Accounts for the majority of seizures presenting on day 1 of life, particularly following difficult deliveries or fetal distress. *Hypoglycemia* - While **hypoglycemia** can cause seizures in newborns, it is generally less common than perinatal asphyxia as the primary cause on the very first day. - Seizures due to hypoglycemia often occur in vulnerable infants like those with **diabetic mothers**, intrauterine growth restriction, or those experiencing a sudden drop in glucose. - Usually presents within 2-3 hours after birth in at-risk infants. *Hypocalcemia* - **Early neonatal hypocalcemia** can cause seizures, but typically presents slightly later, usually after 24-48 hours of life. - More common in infants with **low birth weight**, prematurity, birth asphyxia, or those born to diabetic mothers. - Related to immature parathyroid function and increased phosphate load. *Head injury* - **Birth trauma** with intracranial hemorrhage can cause seizures through direct neuronal damage, but is less frequent than perinatal asphyxia as a cause of day 1 seizures. - Risk factors include **difficult instrumental deliveries**, macrosomia, and precipitous labor. - Incidence has decreased significantly with improved obstetric practices.

Question 9: A 37-week small-for-date neonate is most likely to develop

A. Hypoglycaemia (Correct Answer)
B. Hyaline membrane disease
C. Hypocalcaemia
D. Hypothermia

Explanation: ***Hypoglycaemia*** - **Small-for-date** neonates have reduced **glycogen stores** due to chronic fetal stress or placental insufficiency. - Their increased metabolic demands relative to limited energy reserves make them prone to **low blood glucose**. - This is the **most immediate metabolic complication** requiring urgent screening and management. *Hyaline membrane disease* - This condition, also known as **respiratory distress syndrome**, primarily affects **premature neonates** due to surfactant deficiency. - **Small-for-date infants** at term (37 weeks) typically have **accelerated lung maturity** due to chronic intrauterine stress, making them **less susceptible** to RDS compared to appropriately grown preterm infants. *Hypocalcaemia* - While neonates can experience hypocalcemia, it is particularly common in infants of **diabetic mothers**, those with **asphyxia**, or those born **prematurely**. - Small-for-date status alone isn't the primary risk factor for **neonatal hypocalcaemia**. *Hypothermia* - **Small-for-date** infants have a larger **surface area to body mass ratio** and reduced **subcutaneous fat**, which significantly increases heat loss. - This is indeed a **major risk** requiring immediate attention at birth (thermal protection, skin-to-skin care). - However, **hypoglycemia** is considered the **most characteristic metabolic derangement** and "most likely" complication specifically associated with SGA status, making it the best answer for this question.

Question 10: Management of typical febrile seizures includes all except:

A. Intermittent diazepam
B. Sponging
C. Paracetamol or ibuprofen
D. Prophylactic phenobarbitone (Correct Answer)

Explanation: ***Prophylactic phenobarbitone*** - **Continuous prophylactic anticonvulsant therapy** with phenobarbitone is **definitively NOT recommended** for typical (simple) febrile seizures - The risks of chronic anticonvulsant use—including **sedation, cognitive impairment, and behavioral problems**—significantly outweigh any potential benefits - Evidence shows prophylactic phenobarbital does **not prevent future epilepsy** and has insufficient benefit in preventing recurrent febrile seizures - This is the **correct answer** as it is explicitly excluded from management guidelines *Intermittent diazepam* - While **not routinely recommended** for typical febrile seizures, intermittent rectal or buccal diazepam may be discussed as a *potential option* for specific situations (frequent recurrences, parental anxiety, prolonged seizures) - It serves as **rescue medication** to abort an ongoing seizure rather than daily prophylaxis - Its role in typical febrile seizure management is controversial and limited, but it may be mentioned in comprehensive management discussions *Sponging* - **Tepid sponging** is a supportive physical cooling measure used in fever management - While it does not prevent febrile seizures, it is part of general **symptomatic care** for fever reduction - Typically used alongside antipyretics to help lower body temperature and improve comfort *Paracetamol or ibuprofen* - **Antipyretics** are standard management for fever control and improving the child's comfort - While they do **not reliably prevent** febrile seizures from occurring, they are essential for **symptomatic fever management** - Recommended as first-line treatment for fever in children with febrile seizures

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