Pediatric Anesthesia Practice Questions

Q: Which drug is most commonly used for conscious sedation during MRI procedures in pediatric patients?

Dexmedetomidine. ***Dexmedetomidine*** - **Dexmedetomidine** is an **alpha-2 adrenergic receptor agonist** that provides effective sedation and analgesia without causing significant **respiratory depression**. - It preserves the patient's **airway reflexes** and promotes a state similar to **natural sleep**, making it highly suitable for the prolonged, motion-sensitive environment of an **MRI**. *Midazolam* - While it provides excellent **anxiolysis** and **amnestic effects**, it typically does not provide deep enough sedation for a child to remain perfectly still in an **MRI** scanner. - High doses increase the risk of **respiratory depression** and may occasionally cause **paradoxical agitation** in pediatric patients. *Ketamine* - **Ketamine** is a dissociative anesthetic that often leads to increased **muscle tone** and involuntary movements, which can degrade **MRI image quality**. - It can also cause **excessive salivation** and a prolonged, potentially distressing **recovery period (emergence delirium)** in children. *Propofol* - Although **Propofol** has a rapid onset and recovery, it requires careful monitoring by an anesthesiologist due to the high risk of **apnea** and loss of **airway protection**. - It is generally used for **deep sedation** or general anesthesia rather than the stable, **conscious sedation** typically preferred for basic non-invasive imaging.

Q: A newborn developed respiratory depression in a postoperative ward. Which of the following medications can cause this side effect?

Opioid. **Explanation:** **1. Why Opioids are the Correct Answer:** Opioids (such as morphine or fentanyl) are potent analgesics commonly used for postoperative pain management. However, they are notorious for causing **dose-dependent respiratory depression** by acting on **μ-receptors** in the medullary respiratory centers. This action decreases the sensitivity of the brainstem to carbon dioxide (CO₂). Newborns are particularly vulnerable due to an immature blood-brain barrier, reduced metabolic clearance, and a higher sensitivity of their respiratory centers to opioid-induced depression. **2. Why Other Options are Incorrect:** * **Propofol:** While propofol is a potent intravenous anesthetic that causes respiratory depression and apnea, it is used for the **induction and maintenance** of anesthesia. It has an extremely short half-life (minutes); therefore, it is unlikely to be the primary cause of delayed respiratory depression in a postoperative ward setting once the patient has emerged. * **Furosemide:** This is a loop diuretic used to treat fluid overload or heart failure. Its primary side effects are electrolyte imbalances (hypokalemia) and dehydration, not direct respiratory center depression. * **Heparin:** This is an anticoagulant used to prevent thromboembolism. Its main complication is hemorrhage; it has no effect on the respiratory drive. **Clinical Pearls for NEET-PG:** * **Antidote:** The specific antagonist for opioid-induced respiratory depression is **Naloxone** (dose: 0.01 mg/kg in neonates). * **Neonatal Physiology:** Newborns have a higher chest wall compliance and lower functional residual capacity (FRC), making them desaturate faster during periods of hypoventilation. * **Monitoring:** The earliest sign of opioid toxicity in a postoperative ward is often a **decreased respiratory rate (bradypnea)** and sedation.

Q: Which of the following statements about the pediatric airway is true?

The epiglottis has a more acute angulation.. In the pediatric airway, the **epiglottis** is relatively longer, stiffer, and narrower (often described as **U-shaped or Omega-shaped**). Crucially, it is attached to the hyoid bone at a **more acute angle** to the laryngeal axis, making it appear more anterior and floppy. This necessitates the use of a straight blade (e.g., Miller) to directly lift the epiglottis during intubation. **Analysis of Incorrect Options:** * **A. The larynx is more caudal:** Incorrect. The pediatric larynx is positioned **more cephalad (higher)**. In a neonate, the larynx is at the level of **C3–C4**, whereas in an adult, it descends to **C4–C5**. * **C. The glottic opening is the narrowest part:** Incorrect. Traditionally, the **cricoid cartilage** (subglottic region) was considered the narrowest part, giving the airway a "funnel shape." While recent MRI studies suggest the glottis may be the narrowest transverse dimension, for NEET-PG purposes, the **cricoid** remains the classic answer for the narrowest functional part. * **D. The trachea is longer:** Incorrect. The pediatric trachea is significantly **shorter** (approx. 4–5 cm in neonates vs. 10–12 cm in adults), increasing the risk of endobronchial intubation or accidental extubation with head movement. **High-Yield Clinical Pearls:** * **Tongue:** Relatively larger in proportion to the oral cavity (increases risk of obstruction). * **Occiput:** Prominent in infants; placing a "shoulder roll" (rather than a head ring) helps align the axes for intubation. * **Mainstem Bronchi:** Both bronchi leave the trachea at equal angles until age 2; therefore, foreign body aspiration or endobronchial intubation can occur on either side with equal frequency.

Question 1

Which drug is most commonly used for conscious sedation during MRI procedures in pediatric patients?

Accepted Answer

Dexmedetomidine

Answer

Midazolam

Answer

Ketamine

Answer

Propofol

Question 2

A six-year-old boy is scheduled for examination of the eye under anesthesia. The father informed that for the past six months the child has been developing progressive weakness of both legs. His elder sibling had died at the age of 14 years. Which drug would you definitely avoid during the anesthetic management?

Accepted Answer

Succinylcholine

Answer

Thiopentone

Answer

Nitrous oxide

Answer

Vecuronium

Question 3

A newborn developed respiratory depression in a postoperative ward. Which of the following medications can cause this side effect?

Accepted Answer

Opioid

Answer

Propofol

Answer

Furosemide

Answer

Heparin

Question 4

A five-year-old child is scheduled for strabismus surgery. The anesthesiologist monitors the pulse while the surgeon grasps the medial rectus muscle. What is the primary reason for this monitoring?

Accepted Answer

To detect Aschner's reflex

Answer

To assess the depth of anesthesia

Answer

To rule out ventricular dysrhythmias

Answer

To detect hypotension

Question 5

Which of the following statements about the pediatric airway is true?

Accepted Answer

The epiglottis has a more acute angulation.

Answer

The larynx is in a more caudal position compared to the adult.

Answer

The glottic opening is the narrowest part of the pediatric airway.

Answer

The trachea is longer compared to the adult.

Pediatric Anesthesia — MCQs

Pediatric Anesthesia — MCQs

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