Pediatric Anesthesia — MCQs

Pediatric Anesthesia Indian Medical PG Practice Questions and MCQs

Question 51: What is the primary reason for the preference of sevoflurane in inhalational induction for pediatric anesthesia?

A. It causes minimal airway irritation.
B. It has a sweet smell that is well-tolerated by children.
C. It has a rapid onset and low blood-gas solubility. (Correct Answer)
D. All of the above

Explanation: ***It has a rapid onset and low blood-gas solubility.*** - **Sevoflurane's low blood-gas partition coefficient** means it is minimally soluble in blood, leading to rapid uptake into the brain and thus a fast onset of anesthesia. This is crucial for **inhalational induction, especially in pediatric patients**, where compliance and maintenance of the airway can be challenging. - A rapid onset allows children to pass through the excitatory stages of anesthesia more quickly, reducing the risk of agitation, airway complications, and the stress associated with prolonged induction. *It causes minimal airway irritation.* - While sevoflurane is known for causing **minimal airway irritation** compared to other volatile anesthetics (like isoflurane or desflurane), this characteristic is secondary to its low blood-gas solubility as the primary reason for its preference in inhalational induction. - Reduced airway irritation certainly contributes to a smoother induction by minimizing coughing, breath-holding, and laryngospasm, but it's the **speed of onset** that makes it particularly well-suited for rapid and uneventful induction in children. *It has a sweet smell that is well-tolerated by children.* - Sevoflurane does have a relatively **pleasant, non-pungent odor** compared to other volatile agents, making it more tolerable for children to inhale during induction. - However, while this improved "mask acceptance" is beneficial, it is not the primary physiological reason for its preference in terms of its anesthetic properties and **rapid induction profile**. *All of the above* - While all the listed options are favorable characteristics of sevoflurane that contribute to its suitability for pediatric inhalational induction, **rapid onset and low blood-gas solubility** represent the *primary physiological and pharmacological advantages* that make it the agent of choice. - The other factors, such as minimal airway irritation and pleasant smell, enhance its clinical utility but are not the fundamental reasons for its efficacy in achieving quick and smooth anesthesia.

Question 52: A 4-year-old child with a history of asthma is undergoing general anesthesia for a tonsillectomy when the child suddenly develops bronchospasm during the procedure. Analyze the scenario and determine the most appropriate initial management.

A. Deepen anesthesia and administer bronchodilators (Correct Answer)
B. Administer intravenous epinephrine for immediate relief of bronchospasm
C. Administer intravenous corticosteroids as a long-term management strategy
D. Increase the concentration of inhalational anesthetic to relieve bronchospasm

Explanation: ***Deepen anesthesia and administer bronchodilators*** - **Deepening anesthesia** helps to suppress airway reflexes and reduce the sympathetic nervous system's response to surgical stimulation, thereby limiting further bronchoconstriction. - **Bronchodilators** (e.g., albuterol or salbutamol) directly relax bronchial smooth muscle, facilitating airflow and alleviating bronchospasm. *Administer intravenous epinephrine for immediate relief of bronchospasm* - While **epinephrine** is a potent bronchodilator, its use in this context is typically reserved for severe, life-threatening bronchospasm that is refractory to first-line agents, due to its significant cardiovascular side effects. - The initial approach focuses on less invasive and more targeted treatments before escalating to systemic sympathomimetics. *Administer intravenous corticosteroids as a long-term management strategy* - **Corticosteroids** are anti-inflammatory agents that are beneficial in treating asthma exacerbations by reducing airway inflammation, but their onset of action is slow (hours to days). - They are not suitable for the **immediate relief** of acute bronchospasm during a surgical procedure. *Increase the concentration of inhalational anesthetic to relieve bronchospasm* - While some **inhalational anesthetics** (e.g., sevoflurane, isoflurane) have bronchodilatory properties, simply increasing their concentration as the primary intervention might not be sufficient or fast enough to resolve severe bronchospasm. - Additionally, excessively deep anesthesia can lead to undesirable cardiovascular depression, making it a less precise and potentially risky initial approach compared to direct bronchodilators.

Question 53: What is the primary use of the Mapleson E anesthesia circuit?

A. Controlled ventilation
B. Children
C. Spontaneous ventilation (Correct Answer)
D. All of the options

Explanation: ***Spontaneous ventilation*** - The Mapleson E circuit, also known as the **Ayre's T-piece**, is commonly used for **spontaneous ventilation** due to its low resistance and efficient CO2 elimination during adequate breathing. - Its design, featuring a gas inlet and an open-ended reservoir tube, allows for effective scavenging of exhaled gases with minimal rebreathing in spontaneously breathing patients. *Controlled ventilation* - While it can be adapted for controlled ventilation with some modifications (e.g., adding a bag), the Mapleson E circuit is primarily designed and most efficient for **spontaneous breathing**, not controlled positive pressure ventilation. - More complex circuits like the **Mapleson D** (Bain system) or modern circle systems are generally preferred for controlled ventilation due to better gas conservation and controlled CO2 removal. *Children* - While the Mapleson E circuit is **often used in children**, particularly infants, due to its low dead space and resistance, this is a specific application rather than its primary *use*. - Its design is well-suited for the small tidal volumes and rapid respiratory rates of pediatric patients, but its fundamental function remains in facilitating spontaneous breathing. *All of the options* - While the Mapleson E circuit finds application in **children** and can be adapted for **controlled ventilation** in specific scenarios, its **primary design and most efficient use are for spontaneous ventilation**. - Attributing its primary use to "all of the options" oversimplifies its core function and optimal performance characteristics.

Question 54: In pediatric epidural anaesthesia, what is the volume of local anaesthetic given to achieve a sacral dermatome block?

A. None of the options
B. 0.5 - 1 ml/kg (Correct Answer)
C. 2 - 4 ml/kg
D. 5 - 10 ml/kg

Explanation: ***0.5 - 1 ml/kg*** - For a **sacral dermatome block** in pediatric epidural anesthesia, a volume of **0.5 to 1 ml/kg** of local anesthetic is commonly used. - This volume is generally sufficient to achieve effective analgesia in the desired sacral and lower lumbar dermatomes without causing excessive spread or systemic toxicity. *2 - 4 ml/kg* - This volume range is typically used for a **higher thoracic or lumbar block** in pediatric epidural anesthesia, aiming for a more extensive spread of local anesthetic. - Using this volume for a sacral block would likely result in an **unnecessarily high block** and increase the risk of side effects like hypotension or motor blockade. *5 - 10 ml/kg* - This volume range is **excessively high** for pediatric epidural anesthesia for any dermatomal level, even a sacral block. - Administering such large volumes significantly increases the risk of **systemic local anesthetic toxicity** and severe hemodynamic instability. *None of the options* - This option is incorrect because **0.5 - 1 ml/kg** is a standard and appropriate volume for a sacral dermatome block in children. - There is a correct option provided in the choices.

Question 55: A 6-year-old boy is taken for an ophthalmic examination under anesthesia. His father reports that the boy has lower limb weakness and that his elder brother died at 14 years of age. Which anesthetic drug should be avoided in this case?

A. Succinylcholine (Correct Answer)
B. Pancuronium
C. Atracurium
D. Dexacurium

Explanation: ***Succinylcholine*** - The history of **lower limb weakness** and an elder brother's death at a young age suggests a **neuromuscular disorder** such as Duchenne muscular dystrophy. - In patients with undiagnosed or diagnosed muscular dystrophies, succinylcholine can trigger **rhabdomyolysis**, hyperkalemia, and cardiac arrest due to prolonged depolarization and potassium efflux from damaged muscle cells. *Pancuronium* - This is a **nondepolarizing neuromuscular blocker** with an intermediate duration of action. - While it prolongs neuromuscular blockade in patients with muscle weakness, it does not carry the same risk of **hyperkalemic cardiac arrest** as succinylcholine. *Atracurium* - This is a **nondepolarizing neuromuscular blocker** that undergoes Hofmann elimination and ester hydrolysis, making its elimination largely independent of renal or hepatic function. - It is often considered a **safer option in patients with neuromuscular disorders** because it does not cause potassium efflux or trigger malignant hyperthermia. *Dexacurium* - This is a **long-acting nondepolarizing neuromuscular blocker**. - While its effects might be prolonged in patients with muscle weakness, it does not pose the specific and life-threatening risk of **hyperkalemia** associated with succinylcholine in this patient population.

Question 56: Induction agent of choice in a child with cyanotic heart disease is

A. Thiopentone
B. Ketamine (Correct Answer)
C. Halothane
D. Midazolam

Explanation: ***Ketamine*** - **Ketamine** is preferred in cyanotic heart disease because it generally maintains or even **increases systemic vascular resistance** and **blood pressure**, which helps maintain systemic-pulmonary shunting and reduces right-to-left shunting. - It also has a **sympathomimetic effect**, supporting myocardial contractility and heart rate, which is beneficial in patients with compromised cardiac function. *Thiopentone* - **Thiopentone** can cause **myocardial depression** and **vasodilation**, leading to a decrease in systemic vascular resistance. - This reduction in SVR can exacerbate **right-to-left shunting** in cyanotic heart disease, worsening hypoxemia. *Halothane* - **Halothane** is a potent **myocardial depressant** and causes significant **peripheral vasodilation**, leading to decreased blood pressure and systemic vascular resistance. - These effects can lead to a severe decrease in **pulmonary blood flow** and an increase in **right-to-left shunting**, worsening cyanosis and hypoxemia. *Midazolam* - **Midazolam** is a benzodiazepine primarily used for **sedation** and anxiolysis, not as a primary induction agent in critically ill children. - While it has minimal effects on cardiac output at typical doses, it lacks the favorable hemodynamic profile of ketamine for maintaining **organ perfusion** and preventing increased right-to-left shunting in cyanotic heart disease.

Question 57: A one-year-old child, preterm, and low birth weight with delayed milestones is posted for elective hernia repair. Which of the following statements is true?

A. Wait for complete neurological evaluation (Correct Answer)
B. Avoidance of regional anesthesia
C. Avoidance of combination of inhalational and muscle relaxation
D. Inhalational agents are contraindicated in this scenario.

Explanation: ***Wait for complete neurological evaluation*** - Preterm, low birth weight, and delayed milestones suggest a heightened risk of **neurological complications** and underscore the importance of a thorough pre-operative neurological assessment. - A comprehensive evaluation can identify specific neurological deficits or vulnerabilities, informing anesthesia planning and **post-operative monitoring** to prevent exacerbation or new onset issues. *Inhalational agents are contraindicated in this scenario.* - **Inhalational agents** are not absolutely contraindicated in preterm, low-birth-weight children with delayed milestones, but their use requires careful titration due to potential for **hemodynamic instability** and increased risk of apnea. - The choice of anesthetic technique depends on the child's specific condition and the surgeon's preference, with a focus on **neuroprotective strategies** and minimizing risks. *Avoidance of regional anesthesia* - **Regional anesthesia** can be beneficial in preterm infants for hernia repair by potentially reducing the need for systemic opioids and their associated side effects, as well as lowering the incidence of **post-operative apnea**. - Its use, however, requires careful consideration of the child's coagulation status, cardiovascular stability, and the expertise of the anesthesiologist in performing blocks in this vulnerable population. *Avoidance of combination of inhalational and muscle relaxation* - The combination of **inhalational agents** and **muscle relaxants** is routinely used in pediatric anesthesia for appropriate surgical conditions and is not inherently contraindicated in this population. - Careful titration of both agents is essential to minimize their respective side effects, such as cardiovascular depression from inhalational agents and prolonged muscle weakness from neuromuscular blockers, especially in a child with baseline neurological challenges.

Question 58: The best inhalational agent of choice for induction of anesthesia in a six-year-old child who refuses IV access is –

A. Sevoflurane (Correct Answer)
B. Methoxyflurane
C. Desflurane
D. Isoflurane

Explanation: ***Sevoflurane*** - **Sevoflurane** has a **low pungency** and a **rapid onset** due to its low blood/gas solubility, making it ideal for inhalational inductions in children who are often uncooperative with IV access. - Its pleasant odor and non-irritating properties minimize coughing and breath-holding, ensuring a smooth and quick induction. *Methoxyflurane* - **Methoxyflurane** is **nephrotoxic** and has a very slow onset, making it unsuitable for rapid inhalational induction, especially in children where kidney function can be more sensitive. - Due to its significant side effects and slow induction profile, it is rarely used today for general anesthesia. *Desflurane* - **Desflurane** has a very **pungent odor** and a high incidence of airway irritation, including coughing and breath-holding, which makes it a poor choice for gas induction, particularly in children. - Although it has a rapid onset due to very low blood/gas solubility, its irritating properties outweigh this benefit for pediatric inhalational induction. *Isoflurane* - **Isoflurane** is also highly **pungent** and associated with significant airway irritation, making it uncomfortable for inhaled induction and poorly tolerated by children. - It has a slower onset compared to sevoflurane and desflurane, further diminishing its suitability for uneventful inhalational induction in pediatric patients.

Practice by Chapter

Anatomical and Physiological Differences in Children

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Pharmacological Considerations in Pediatrics

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Preoperative Evaluation of Pediatric Patients

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Induction Techniques in Children

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Airway Management in Children

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Fluid Management in Pediatric Anesthesia

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Temperature Regulation in Children

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Regional Anesthesia in Children

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Anesthesia for Common Pediatric Surgeries

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Anesthesia for Congenital Heart Disease

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Emergence Delirium in Children

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Perioperative Pain Management in Children

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