Pediatric Anesthesia Practice Questions

Q: An 8-year-old boy, weighing 30kg, is undergoing resection of a Wilms tumor. His hemoglobin is 12g/dL. If the threshold for transfusion is 8g/dL, what is the allowable blood loss?

840ml. ### Explanation The calculation of **Allowable Blood Loss (ABL)** is a critical skill in pediatric anesthesia to prevent hemodilution-induced anemia and ensure timely transfusion. **1. The Calculation (Why B is correct):** To calculate ABL, we use the standard formula: $$ABL = \frac{EBV \times (H_i - H_f)}{H_i}$$ *Where: EBV = Estimated Blood Volume; $H_i$ = Initial Hemoglobin; $H_f$ = Final (Target) Hemoglobin.* * **Step 1: Determine EBV.** For a child (older than 1 year), the average EBV is **70 ml/kg**. * $EBV = 30\text{ kg} \times 70\text{ ml/kg} = 2100\text{ ml}$. * **Step 2: Apply the formula.** * $ABL = \frac{2100 \times (12 - 8)}{12}$ * $ABL = \frac{2100 \times 4}{12}$ * $ABL = \frac{8400}{12} = \mathbf{840\text{ ml}}$. **2. Why other options are incorrect:** * **A (820ml):** This value would result if a lower EBV (approx. 68 ml/kg) was used, which is not the standard teaching for an 8-year-old. * **C & D (860ml & 880ml):** These values would result from using higher EBV constants (72–74 ml/kg), which are more characteristic of infants rather than school-aged children. **3. Clinical Pearls for NEET-PG:** * **EBV Variations by Age:** * Premature Neonates: 90–100 ml/kg * Full-term Neonates: 80–90 ml/kg * Infants (3 mo – 1 year): 75–80 ml/kg * **Children (>1 year): 70–75 ml/kg** (Use 70 for calculations unless specified) * Adult Males: 70 ml/kg; Adult Females: 65 ml/kg * **Wilms Tumor:** Often involves significant blood loss due to its vascular nature and proximity to major vessels (IVC). * **Transfusion Trigger:** While 8 g/dL is used here, the clinical decision to transfuse also depends on the rate of bleeding and hemodynamic stability.

Q: The Children's Hospital of Eastern Ontario Pain Scale (CHEOPS) for rating postoperative pain in children includes all of the following components except?

Oxygen saturation. **Explanation:** The **Children's Hospital of Eastern Ontario Pain Scale (CHEOPS)** is a behavioral scale used to assess postoperative pain in children, typically aged 1 to 7 years. It relies entirely on **behavioral observations** rather than physiological parameters. **Why Oxygen Saturation is the Correct Answer:** Oxygen saturation ($SpO_2$) is a **physiological parameter**, not a behavioral one. While physiological changes (tachycardia, hypertension, or desaturation) can occur due to pain, they are non-specific and can be influenced by anesthesia, respiratory distress, or anxiety. Therefore, $SpO_2$ is **not** a component of the CHEOPS scale. **Analysis of Incorrect Options (Components of CHEOPS):** The CHEOPS scale evaluates six specific behavioral categories, each scored from 0–2 or 1–3 (Total score range: 4–13): * **Cry (Option A):** Assesses if the child is not crying, moaning, or screaming. * **Touch (Option B):** Evaluates the child’s reaction to the wound site (e.g., not touching, reaching, or grabbing). * **Torso (Option C):** Observes body posture (e.g., neutral, shifting, tense, or shivering). * *Other components include:* **Facial Expression** (smiling, neutral, or grimacing), **Verbalization** (positive, neutral, or complaining), and **Legs** (neutral, kicking, or drawn up). **High-Yield Clinical Pearls for NEET-PG:** * **CHEOPS Cut-off:** A score of **$\geq$ 6** is generally considered indicative of significant pain requiring intervention. * **FLACC Scale:** Another high-yield behavioral scale (Face, Legs, Activity, Cry, Consolability) used for infants and non-verbal children. * **Self-Reporting:** The **Wong-Baker FACES Scale** is the gold standard for children who can self-report (usually $>3$ years). * **Physiological Scales:** Scales like **CRIES** (used in neonates) *do* include physiological parameters like $SpO_2$ and Heart Rate, unlike CHEOPS.

Q: The Rendell-Baker-Soucek face mask is commonly used in which patient population?

Pediatric. **Explanation:** The **Rendell-Baker-Soucek (RBS) mask** is specifically designed for the **pediatric** population, particularly infants and small children. Its unique design is based on the anatomical features of a child's face, characterized by a flat nasal bridge and a small chin. **Why Option A is correct:** The RBS mask features a low-profile, anatomical shape with a shallow dome. This design significantly reduces **mechanical dead space**, which is critical in neonates and infants who have low tidal volumes. By minimizing dead space, the mask prevents the rebreathing of carbon dioxide ($CO_2$), ensuring efficient ventilation. **Why other options are incorrect:** * **B. Geriatric:** Elderly patients often have sunken cheeks due to loss of teeth or subcutaneous fat. They require masks with high-volume inflatable cuffs (like the standard transparent plastic masks) to create an adequate seal. * **C. Pregnant:** Physiological changes in pregnancy require standard pre-oxygenation techniques. There is no specific indication for an RBS mask; standard adult masks are used. * **D. Bariatric:** Obese patients often have redundant soft tissue and are difficult to ventilate. They require large, well-sealing adult masks and often benefit from the "two-hand" ventilation technique. **High-Yield Clinical Pearls for NEET-PG:** * **Dead Space:** The primary advantage of the RBS mask is the reduction of dead space. * **Design:** It lacks an inflatable cuff, which helps in fitting the flat facial contours of a child. * **Material:** Traditionally made of black antistatic rubber, though modern versions exist in transparent plastic. * **Anatomy:** Always remember that pediatric airways are characterized by a large tongue, cephalad larynx (C3-C4), and a long, U-shaped epiglottis—factors that make proper mask fit and positioning vital.

Q: What is the appropriate endotracheal tube size for a full-term infant?

3.5 mm. In pediatric anesthesiology, selecting the correct endotracheal tube (ETT) size is critical to ensure adequate ventilation while preventing subglottic stenosis or mucosal ischemia. ### **Explanation of the Correct Answer** For a **full-term infant** (typically weighing 3.0–3.5 kg), the standard internal diameter (ID) for an uncuffed ETT is **3.5 mm**. This size provides the optimal balance between airway resistance and the risk of trauma to the narrowest part of the infant's airway—the cricoid cartilage. ### **Analysis of Incorrect Options** * **A. 2.5 mm:** This size is reserved for **premature infants** (usually <1000g or <28 weeks gestation). Using this in a full-term infant would result in high airway resistance and significant air leaks. * **C. 4.5 mm:** This size is appropriate for children aged **1 to 2 years**. In a neonate, this would be too large, potentially causing pressure necrosis of the tracheal mucosa. * **D. 5.5 mm:** This size is typically used for children around **5 to 6 years** of age. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Formula for Children (>2 years):** * **Uncuffed ETT size (mm) = (Age / 4) + 4** * **Cuffed ETT size (mm) = (Age / 4) + 3.5** 2. **Insertion Depth:** A quick bedside rule for ETT depth (at the lip) is **(Weight in kg + 6)** or **(ETT size × 3)**. 3. **Narrowest Point:** In children, the narrowest part of the airway is traditionally considered the **cricoid cartilage** (funnel-shaped), whereas in adults, it is the **glottis** (cylindrical). 4. **The "Leak Test":** An ideal pediatric ETT fit should allow a small air leak at an inspiratory pressure of **15–25 cm H₂O**.

Q: All agents can be given for induction of anesthesia in children except?

Morphine. **Explanation:** In pediatric anesthesia, **induction** refers to the transition from an awake state to a surgical plane of anesthesia. This is typically achieved via **Inhalational Induction** (using a mask) or **Intravenous (IV) Induction**. **Why Morphine is the Correct Answer:** Morphine is a potent opioid analgesic used primarily for **maintenance of anesthesia** and postoperative pain relief. It is **not** an induction agent because it lacks the pharmacological properties to rapidly produce a state of unconsciousness. Furthermore, morphine triggers **histamine release**, which can cause hypotension and bronchospasm—complications that are particularly risky during the induction phase in children. **Analysis of Incorrect Options:** * **Halothane (A):** Historically the "gold standard" for pediatric inhalational induction due to its non-pungent odor and low airway irritability. However, it has been largely replaced by Sevoflurane due to risks of arrhythmias and "halothane hepatitis." * **Sevoflurane (B):** Currently the **agent of choice** for mask induction in children. It is non-pungent, has a low blood-gas solubility (allowing rapid induction/recovery), and causes minimal airway irritation. * **N2O (D):** Often used as an adjuvant during inhalational induction (the "Second Gas Effect") to speed up the uptake of more potent agents like Sevoflurane. **High-Yield Clinical Pearls for NEET-PG:** * **Best Inhalational Agent for Induction:** Sevoflurane (due to pleasant smell and lack of pungency). * **Worst Inhalational Agent for Induction:** Desflurane (highly pungent, causes laryngospasm). * **Best IV Induction Agent (General):** Propofol. * **Best IV Induction Agent for Hemodynamically Unstable Kids:** Ketamine or Etomidate. * **Pre-medication:** Midazolam (oral) is the most common drug used to reduce separation anxiety in children.

Q: In an infant, which method is used for administering anesthesia?

Ayre's T-piece. **Explanation:** The primary goal in pediatric anesthesia is to minimize **resistance to breathing** and **dead space**, as infants have small tidal volumes and easily fatigued respiratory muscles. **Why Ayre’s T-piece is correct:** Ayre’s T-piece (Mapleson E) and its modification, the **Jackson-Rees circuit** (Mapleson F), are the systems of choice for infants and children weighing less than 20 kg. These are **valveless circuits** with minimal dead space and very low resistance. Since there are no unidirectional valves or soda lime canisters to breathe through, the work of breathing is significantly reduced, making it ideal for the spontaneous ventilation of an infant. **Analysis of Incorrect Options:** * **Open mask ventilation:** This is an obsolete technique (e.g., Schimmelbusch mask) that leads to unpredictable anesthetic concentrations and significant environmental pollution. * **Non-breathing circuit:** While technically Ayre's T-piece is a non-rebreathing system, the term usually refers to circuits with valves (like the Bain circuit). In infants, the valves in standard non-rebreathing circuits increase resistance beyond the child's physiological tolerance. * **Magill’s system (Mapleson A):** This is the most efficient circuit for **spontaneously breathing adults**. However, it is unsuitable for infants because it is bulky and the expiratory valve adds significant resistance. **High-Yield Clinical Pearls for NEET-PG:** * **Jackson-Rees Circuit:** The most commonly used modification of Ayre's T-piece; it adds a reservoir bag to allow for assisted ventilation and monitoring of respirations. * **Fresh Gas Flow (FGF):** To prevent rebreathing in a T-piece, the FGF should be **2.5 to 3 times** the patient's minute ventilation. * **Mapleson Classification:** Remember the mnemonic **"All Dogs Can Bite Eat Fresh"** (A, B, C, D, E, F). Mapleson A is best for spontaneous ventilation; Mapleson D is best for controlled ventilation.

Q: What is the most important measure to avoid subglottic edema in children?

Use of appropriate size endotracheal tube. **Explanation:** The pediatric airway is anatomically unique, characterized by a funnel shape where the **cricoid cartilage** is the narrowest point. Subglottic edema in children is primarily caused by mechanical trauma and pressure-induced ischemia to the delicate subglottic mucosa. **Why Option A is correct:** Using an **appropriate size endotracheal tube (ETT)** is the most critical preventive measure. A tube that is too large exerts continuous pressure on the circumferential cricoid ring. If this pressure exceeds the capillary perfusion pressure of the mucosa (approx. 25–30 cm H₂O), it leads to edema, inflammation, and potentially subglottic stenosis. A "leak" should ideally be present at 15–20 cm H₂O inspiratory pressure to ensure the tube is not too tight. **Why other options are incorrect:** * **Option B:** While lubrication may reduce friction during insertion, it does not prevent the constant pressure necrosis caused by an oversized tube. * **Option C:** IV lidocaine is used to blunt the sympathetic response to intubation (hemodynamic stability) but has no role in preventing mechanical mucosal edema. * **Option D:** Routine IV steroids are **not** recommended for all intubations. They are reserved for high-risk cases (e.g., traumatic intubation, prolonged surgery, or known small airways) and do not substitute for proper tube sizing. **High-Yield NEET-PG Pearls:** 1. **Narrowest part of airway:** Cricoid cartilage (in children < 8 years); Glottis (in adults). 2. **Formula for Uncuffed ETT size:** (Age/4) + 4. 3. **Formula for Cuffed ETT size:** (Age/4) + 3.5. 4. **Poiseuille’s Law:** In children, even 1mm of edema reduces the cross-sectional area of the subglottic space by 75%, significantly increasing airway resistance.

Q: Upper respiratory tract infection is a common problem in children. All of the following anesthetic complications can occur in children with respiratory infections except?

Halothane granuloma. **Explanation:** The correct answer is **B. Halothane granuloma**. This is because "Halothane granuloma" is a non-existent clinical entity. Halothane is known for causing "Halothane Hepatitis" (immune-mediated liver injury), but it does not cause granulomatous lesions in the respiratory tract or elsewhere. **Why the other options are incorrect (Complications of URI):** Children with an active or recent Upper Respiratory Infection (URI) have "irritable airways" due to inflammation and increased secretions. * **Laryngospasm (D):** This is the most common and feared respiratory complication. Airway hyper-reactivity makes the vocal cords prone to forceful closure during induction or emergence. * **Increased mucosal bleeding (C):** URI causes congestion and friability of the respiratory mucosa. Instrumentation (like suctioning or intubation) can easily lead to bleeding. * **Bacteremia (A):** The inflamed mucosal barrier is compromised. Manipulations such as endotracheal intubation can facilitate the translocation of surface bacteria into the bloodstream. **Clinical Pearls for NEET-PG:** * **The "Rule of 2-4-6":** Airway hyper-reactivity persists for several weeks after a URI. Elective surgery is ideally postponed for **2 weeks** for mild symptoms and **4–6 weeks** if the infection was severe (e.g., bronchitis or pneumonia). * **Risk Factors:** The risk of respiratory adverse events (PRAE) is highest in children who are intubated, have second-hand smoke exposure, or have copious secretions. * **Management:** Use of a Laryngeal Mask Airway (LMA) is often preferred over an Endotracheal Tube (ETT) in mild URI cases as it is less stimulating to the subglottic area.

Q: A pediatric patient scheduled for surgery should have the procedure rescheduled in all of the following conditions except-

Obstructive sleep apnea. **Explanation:** The decision to proceed with or postpone pediatric surgery depends on balancing the risk of perioperative respiratory adverse events (PRAE) against the urgency of the procedure. **Why Obstructive Sleep Apnea (OSA) is the Correct Answer:** OSA is a chronic condition frequently associated with adenotonsillar hypertrophy in children. While OSA increases the risk of postoperative airway obstruction and requires careful monitoring (often in an ICU setting), it is an **indication for surgery** rather than a reason to postpone it. Rescheduling would not resolve the underlying anatomical obstruction; instead, these patients are managed with specialized anesthetic techniques and postoperative vigilance. **Why the Other Options are Wrong (Reasons to Postpone):** The presence of an Upper Respiratory Tract Infection (URTI) significantly increases airway reactivity. Surgery should be rescheduled (usually for 4–6 weeks) if the following "red flags" are present: * **Fever (>38.5°C):** Indicates an active systemic infection, increasing the risk of laryngospasm and bronchospasm tenfold. * **Purulent Secretions:** Suggests a bacterial infection or significant viral load, leading to increased mucus plugging and postoperative pneumonia. * **Wheezing:** Indicates lower airway involvement and hyperreactivity. Proceeding with anesthesia during active wheezing carries a high risk of life-threatening bronchospasm. **Clinical Pearls for NEET-PG:** * **The "6-Week Rule":** Airway hyperreactivity persists for up to 6 weeks following a URTI. * **Laryngospasm:** The most common respiratory complication in pediatric anesthesia; highest risk is during extubation in a child with a recent URTI. * **OSA Management:** These patients are highly sensitive to opioids; use a multimodal analgesic approach and consider overnight pulse oximetry.

Question 1

An 8-year-old boy, weighing 30kg, is undergoing resection of a Wilms tumor. His hemoglobin is 12g/dL. If the threshold for transfusion is 8g/dL, what is the allowable blood loss?

Accepted Answer

840ml

Answer

820ml

Answer

860ml

Answer

880ml

Question 2

The Children's Hospital of Eastern Ontario Pain Scale (CHEOPS) for rating postoperative pain in children includes all of the following components except?

Accepted Answer

Oxygen saturation

Answer

Cry

Answer

Touch

Answer

Torso

Question 3

The Rendell-Baker-Soucek face mask is commonly used in which patient population?

Accepted Answer

Pediatric

Answer

Geriatric

Answer

Pregnant

Answer

Bariatric

Question 4

What is the appropriate endotracheal tube size for a full-term infant?

Accepted Answer

3.5 mm

Answer

2.5 mm

Answer

4.5 mm

Answer

5.5 mm

Question 5

All agents can be given for induction of anesthesia in children except?

Accepted Answer

Morphine

Answer

Halothane

Answer

Sevoflurane

Answer

N2O

Question 6

In an infant, which method is used for administering anesthesia?

Accepted Answer

Ayre's T-piece

Answer

Open mask ventilation

Answer

Non-breathing circuit

Answer

Magill's system

Question 7

A neonate develops respiratory depression in the ward. Which of the following drugs is most likely to be the cause?

Accepted Answer

Opioids

Answer

Barbiturates

Answer

Diazepam

Answer

Propofol

Question 8

What is the most important measure to avoid subglottic edema in children?

Accepted Answer

Use of appropriate size endotracheal tube

Answer

Lubricating endotracheal tube prior to intubation

Answer

Administer IV lidocaine for all intubations

Answer

Administer IV steroids for all intubations

Question 9

Upper respiratory tract infection is a common problem in children. All of the following anesthetic complications can occur in children with respiratory infections except?

Accepted Answer

Halothane granuloma

Answer

Bacteremia

Answer

Increased mucosal bleeding

Answer

Laryngospasm

Question 10

A pediatric patient scheduled for surgery should have the procedure rescheduled in all of the following conditions except-

Accepted Answer

Obstructive sleep apnea

Answer

Fever (>38.5°C)

Answer

Purulent secretions

Answer

Wheezing present

Pediatric Anesthesia — MCQs

Pediatric Anesthesia — MCQs

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