Pediatric Critical Care — MCQs

A 15-month-old girl has a history of poor oral fluid intake, occasional vomiting, rapid breathing, and decreased urine output. Physical examination reveals a pulse of 150/min, BP of 120/80, and a respiratory rate of 60/min. There are bibasilar rales, and the liver is palpable. Which of the following procedures might be helpful in evaluating the oliguria, EXCEPT?

Q47Medium

Resuscitation of a child with heart rate < 60/min includes all of the following, except:

Q48Medium

What is the maintenance intravenous fluid dose for a 7-year-old girl weighing 25 kg?

Q49Medium

Which of the following is NOT true about Asystole?

Q50Easy

What is the most common feature of polytrauma in the pediatric age group?

Pediatric Critical Care Indian Medical PG Practice Questions and MCQs

Question 41: A 5-year-old child is brought to the emergency department after an electrocution incident. The child is apneic and is being ventilated with a bag and mask. There are burns on each hand. What is the next step in management?

A. Check pulses (Correct Answer)
B. Start chest compressions
C. Intubate
D. Check oxygen saturation

Explanation: **Explanation:** The management of a pediatric patient following electrocution follows the standard **PALS (Pediatric Advanced Life Support)** algorithm. In this scenario, the child is apneic and receiving rescue breathing (bag-mask ventilation). According to the PALS sequence, once apnea is identified and ventilation is initiated, the immediate next step is to **assess the pulse** to determine if the child is in respiratory arrest or cardiac arrest. * **Why Option A is correct:** Electrocution often causes cardiac arrhythmias (such as Ventricular Fibrillation or Asystole). You cannot proceed to the next step of the algorithm without knowing if there is a perfusing rhythm. If a pulse is present, you continue rescue breathing; if absent (or <60 bpm with poor perfusion), you begin CPR. * **Why Option B is incorrect:** Chest compressions are only indicated if the pulse is absent or inadequate (<60 bpm). Starting them before checking the pulse violates the basic BLS/PALS sequence. * **Why Option C is incorrect:** While the child may eventually need intubation for airway protection or prolonged ventilation, it is not the immediate next step. Circulation (C) must be assessed before definitive airway (A) management in this emergency context. * **Why Option D is incorrect:** Pulse oximetry is a secondary assessment tool. In an apneic patient, clinical assessment of circulation (pulse check) takes precedence over waiting for a saturation probe to waveform. **High-Yield Clinical Pearls for NEET-PG:** * **Most common arrhythmia in electrocution:** Ventricular Fibrillation (AC current) or Asystole (DC/Lightning). * **Entry/Exit wounds:** Always look for these; they indicate the path of the current. * **Complications:** Watch for rhabdomyolysis (leading to AKI) and posterior shoulder dislocations (due to tetanic muscle contractions). * **Fluid Resuscitation:** Use the Parkland formula, but be aware that electrical burns often have deeper tissue damage than is visible on the surface.

Question 42: What is the recommended endotracheal concentration of adrenaline during CPR in pediatric patients?

A. 1:10 lakhs
B. 1:1 lakh
C. 1:10,000
D. 1:1,000 (Correct Answer)

Explanation: **Explanation:** In pediatric resuscitation, the preferred routes for adrenaline administration are intravenous (IV) or intraosseous (IO). However, if vascular access cannot be established, the **endotracheal (ET) route** is used. **1. Why 1:1,000 is Correct:** The standard IV/IO dose of adrenaline is **0.01 mg/kg** using the **1:10,000** concentration. However, drug absorption via the ET route is unpredictable and significantly less efficient than the IV route. To achieve comparable plasma levels, the **PALS (Pediatric Advanced Life Support) guidelines** recommend a much higher ET dose: **0.1 mg/kg**. To avoid delivering an excessive volume of fluid into the lungs, this higher dose is administered using the concentrated **1:1,000 (1 mg/ml)** preparation. **2. Why Incorrect Options are Wrong:** * **Option C (1:10,000):** This is the standard concentration used for **IV/IO** administration. Using this for the ET route would require 10 times the volume, potentially causing surfactant washout or interfering with gas exchange. * **Options A & B (1:10 lakhs / 1:1 lakh):** These are highly dilute concentrations (often used in local anesthesia with lidocaine) and are insufficient for cardiac arrest resuscitation. **High-Yield Clinical Pearls for NEET-PG:** * **ET Dose Rule of Thumb:** The ET dose of adrenaline is **10 times** the IV dose (0.1 mg/kg vs. 0.01 mg/kg). * **Administration:** After ET instillation, follow with several positive-pressure breaths to ensure peripheral distribution. * **Drugs via ET Tube (LEAN/NAVEL):** Remember the mnemonic **LEAN** (Lidocaine, Epinephrine, Atropine, Naloxone) or **NAVEL** (+ Vasopressin) for drugs that can be given endotracheally. * **Preferred Route:** Always prioritize IO access over ET if IV access fails, as IO pharmacokinetics are identical to IV.

Question 43: What is the daily maintenance fluid requirement for a child weighing 10 kg?

A. 1000 ml/day (Correct Answer)
B. 800 ml/day
C. 500 ml/day
D. 1200 ml/day

Explanation: The calculation of maintenance fluids in pediatrics is based on the **Holliday-Segar Formula**, which estimates caloric expenditure and associated water loss. This is a high-yield concept for NEET-PG. ### **Explanation of the Correct Answer** According to the Holliday-Segar rule (100-50-20 rule), daily fluid requirements are calculated based on body weight: * **First 10 kg:** 100 ml/kg/day * **Next 10 kg (11–20 kg):** Add 50 ml/kg/day * **Each kg above 20 kg:** Add 20 ml/kg/day For a child weighing **10 kg**, the calculation is: $10\text{ kg} \times 100\text{ ml/kg} = \mathbf{1000\text{ ml/day}}$. ### **Analysis of Incorrect Options** * **Option B (800 ml/day):** This underestimates the requirement. 80 ml/kg is often used for calculating fluids in the early neonatal period (Day 3-4) but is insufficient for a 10 kg infant. * **Option C (500 ml/day):** This is significantly low (50 ml/kg) and would lead to dehydration and electrolyte imbalances in a healthy 10 kg child. * **Option D (1200 ml/day):** This exceeds the standard maintenance. 1200 ml would be the requirement for a **14 kg** child ($1000\text{ ml for first 10 kg} + 4 \times 50\text{ ml for the remaining 4 kg}$). ### **High-Yield Clinical Pearls for NEET-PG** 1. **Hourly Rate Shortcut:** To find the hourly infusion rate, use the **4-2-1 rule**: 4 ml/kg for the first 10 kg, 2 ml/kg for the next 10 kg, and 1 ml/kg thereafter. For this child: $10 \times 4 = 40\text{ ml/hr}$. 2. **Fluid Choice:** Isotonic solutions (e.g., 0.9% Normal Saline in D5) are now preferred over hypotonic solutions (like 0.18% saline) to prevent hospital-acquired hyponatremia. 3. **Exceptions:** Maintenance fluids should be reduced in conditions like SIADH, renal failure, or congestive heart failure.

Question 44: A 4-year-old child presents with shock and circulatory collapse. Intravenous access is not possible. What is the next best step?

A. Intraosseous cannulation (Correct Answer)
B. Intracardiac infusion
C. Thoracotomy
D. Cardiopulmonary resuscitation (CPR)

Explanation: **Explanation:** In pediatric emergencies involving circulatory collapse or decompensated shock, establishing vascular access is critical for fluid resuscitation and drug delivery. According to **PALS (Pediatric Advanced Life Support) guidelines**, if peripheral intravenous (IV) access cannot be established within **90 seconds or three attempts**, the next best step is **Intraosseous (IO) cannulation**. **Why Option A is correct:** The intraosseous space contains a non-collapsible venous plexus that drains into the central circulation. Even in profound shock where peripheral veins collapse, the IO route remains accessible. It is considered equivalent to IV access for the administration of fluids, blood products, and all emergency medications (including vasopressors). The most common site in children is the **proximal tibia**. **Why other options are incorrect:** * **B. Intracardiac infusion:** This is an obsolete and dangerous practice associated with high risks of coronary artery laceration, pneumothorax, and cardiac tamponade. * **C. Thoracotomy:** This is an invasive surgical procedure reserved for specific traumatic arrests (e.g., penetrating chest trauma) and is not a method for gaining vascular access. * **D. CPR:** While CPR is vital if the patient is in cardiac arrest (pulseless), the question specifies "circulatory collapse" and asks for the next step in management when IV access fails. Restoring volume is the priority to prevent progression to arrest. **High-Yield Clinical Pearls for NEET-PG:** * **Preferred IO Site:** Proximal tibia (1–3 cm below the tibial tuberosity on the anteromedial surface). * **Contraindications:** Fracture of the bone, overlying infection (cellulitis), or previous IO attempt in the same bone. * **Confirmation:** A "give" or "pop" felt during insertion, aspiration of bone marrow, and the needle standing upright without support. * **Fluid Rate:** Fluids must be administered via pressure bags as the marrow provides resistance.

Question 45: A 3-year-old boy with a history of bronchial asthma presents with progressive shortness of breath for 1 day. On examination, the child is cyanotic, gasping, and unresponsive. What is your immediate priority?

A. Intubate
B. Administer 100% oxygen by mask (Correct Answer)
C. Ventilate with a bag-valve-mask device
D. Administer nebulised salbutamol

Explanation: **Explanation:** The clinical presentation of cyanosis, gasping, and unresponsiveness in a child indicates **imminent respiratory failure**. In any pediatric emergency, the primary goal is to restore oxygenation and ventilation immediately. **1. Why Option B is Correct:** The immediate priority in any child with respiratory distress or failure is the administration of **100% oxygen**. Oxygen is the most critical "drug" in this scenario to combat hypoxia and prevent cardiac arrest. While other interventions (like BVM or intubation) may follow, providing high-flow oxygen is the first step in the "ABC" (Airway, Breathing, Circulation) sequence of pediatric resuscitation. **2. Why Other Options are Incorrect:** * **Option A (Intubate):** While the child may eventually require intubation, it is never the *first* step. One must always pre-oxygenate the patient to increase the functional residual capacity (FRC) and prevent desaturation during the procedure. * **Option C (Ventilate with BVM):** Bag-valve-mask ventilation is indicated if the child has inadequate respiratory effort. However, the very first action upon encountering a cyanotic child is to apply oxygen. If the child remains apneic or has inadequate gasping after oxygen application, BVM becomes the next priority. * **Option D (Nebulised Salbutamol):** While salbutamol is the treatment for asthma, it is contraindicated as a *first* step in a gasping, unresponsive child. The patient is in "silent chest" territory; they cannot move enough air to inhale the nebulized medication. **Clinical Pearls for NEET-PG:** * **The "Golden Rule":** In pediatric resuscitation, hypoxia is the most common cause of bradycardia and subsequent cardiac arrest. Always prioritize oxygenation. * **Silent Chest:** In severe asthma, the absence of wheezing (silent chest) is a more ominous sign than loud wheezing, as it indicates insufficient air movement. * **Sequence:** Oxygen → BVM (if needed) → Intubation (if BVM fails or airway protection is needed).

Question 46: A 15-month-old girl has a history of poor oral fluid intake, occasional vomiting, rapid breathing, and decreased urine output. Physical examination reveals a pulse of 150/min, BP of 120/80, and a respiratory rate of 60/min. There are bibasilar rales, and the liver is palpable. Which of the following procedures might be helpful in evaluating the oliguria, EXCEPT?

A. Giving a fluid challenge with isotonic saline, 20 ml/kg (Correct Answer)
B. Determining the urine sodium concentration
C. Determining the BUN and serum creatinine levels
D. Giving a dose of intravenous furosemide

Explanation: **Explanation:** The clinical presentation of this 15-month-old girl—tachycardia (150/min), tachypnea (60/min), bibasilar rales, and a palpable liver—is diagnostic of **Congestive Heart Failure (CHF)**. In this context, the oliguria is likely due to decreased cardiac output and renal perfusion. **1. Why Option A is the correct answer (The "Except"):** In a patient with signs of fluid overload or heart failure (rales and hepatomegaly), giving a **fluid challenge (20 ml/kg of isotonic saline)** is contraindicated. It can acutely worsen pulmonary edema and lead to respiratory failure. While fluid boluses are the standard treatment for hypovolemic shock, they are dangerous in cardiogenic shock or CHF. **2. Analysis of Incorrect Options:** * **Option B (Urine Sodium):** This helps differentiate between pre-renal azotemia (where urine sodium is typically <20 mEq/L) and acute tubular necrosis (where it is >40 mEq/L), aiding the evaluation of oliguria. * **Option C (BUN and Creatinine):** These are essential baseline markers to assess the degree of renal impairment and the BUN/Creatinine ratio. * **Option D (IV Furosemide):** In the setting of CHF and fluid overload, a diuretic challenge can help determine if the kidneys are responsive and simultaneously treat the underlying pulmonary congestion. **Clinical Pearls for NEET-PG:** * **Hepatomegaly + Respiratory Distress:** In a pediatric patient, this combination should immediately raise suspicion of **Heart Failure**, not just primary lung disease. * **Fluid Management:** Always auscultate the lungs and palpate the liver before giving a fluid bolus. If rales or gallop rhythm are present, avoid aggressive fluid resuscitation. * **Normal BP in Shock:** Note that the BP (120/80) is actually high for a 15-month-old (compensated state); do not wait for hypotension to diagnose critical illness.

Question 47: Resuscitation of a child with heart rate < 60/min includes all of the following, except:

A. Chest compression
B. Adrenaline
C. Endotracheal tube intubation
D. Atropine (Correct Answer)

Explanation: In pediatric resuscitation, the primary cause of bradycardia and cardiac arrest is usually **hypoxia and respiratory failure**, rather than primary cardiac issues. ### **Why Atropine is the Correct Answer (The "Except")** According to the PALS (Pediatric Advanced Life Support) guidelines, the management of a child with a heart rate **< 60/min** with signs of poor perfusion—despite adequate oxygenation and ventilation—focuses on improving oxygen delivery and cardiac output. **Atropine is no longer recommended as a first-line drug** for symptomatic bradycardia unless the bradycardia is due to increased vagal tone (e.g., during suctioning), primary AV block, or organophosphate poisoning. It does not address the underlying hypoxic cause of pediatric arrest. ### **Analysis of Other Options** * **Chest Compressions:** Indicated in a child if the heart rate remains < 60/min with signs of poor perfusion despite effective ventilation with 100% oxygen. * **Adrenaline (Epinephrine):** The drug of choice for persistent symptomatic bradycardia. It provides alpha-adrenergic vasoconstriction and beta-adrenergic inotropic/chronotropic effects to restore circulation. * **Endotracheal Intubation:** Securing the airway is a priority. Since most pediatric bradycardia is respiratory in origin, ensuring optimal ventilation and oxygenation via an ET tube is a standard resuscitative step. ### **High-Yield Clinical Pearls for NEET-PG** * **Compression-to-Ventilation Ratio:** 15:2 for two-rescuer CPR in children; 30:2 for single-rescuer. * **Adrenaline Dose:** 0.01 mg/kg (0.1 mL/kg of 1:10,000 concentration) IV/IO. * **Atropine Dose:** 0.02 mg/kg (Minimum dose 0.1 mg to avoid paradoxical bradycardia). * **Depth of Compression:** At least 1/3rd the AP diameter of the chest (approx. 4 cm in infants, 5 cm in children).

Question 48: What is the maintenance intravenous fluid dose for a 7-year-old girl weighing 25 kg?

A. 1400 ml/day
B. 1500 ml/day
C. 1600 ml/day (Correct Answer)
D. 1700 ml/day

Explanation: ### Explanation The calculation of maintenance intravenous fluids in pediatrics is based on the **Holliday-Segar Formula**, which estimates caloric expenditure and fluid requirements based on body weight. **The Calculation:** For a child weighing 25 kg, the fluid requirement is calculated using the "100-50-20" rule: 1. **First 10 kg:** 100 ml/kg/day = $10 \times 100 = 1000 \text{ ml}$ 2. **Next 10 kg (11–20 kg):** 50 ml/kg/day = $10 \times 50 = 500 \text{ ml}$ 3. **Remaining weight (>20 kg):** 20 ml/kg/day for each kg above 20 kg. * For this child: $25\text{ kg} - 20\text{ kg} = 5\text{ kg}$ * $5 \times 20 = 100 \text{ ml}$ **Total Maintenance Fluid:** $1000 + 500 + 100 = \mathbf{1600 \text{ ml/day}}$. --- **Analysis of Incorrect Options:** * **Option A (1400 ml/day):** This would be the requirement for a 18 kg child. * **Option B (1500 ml/day):** This is the maintenance for exactly a 20 kg child. * **Option D (1700 ml/day):** This would be the requirement for a 30 kg child. --- **Clinical Pearls for NEET-PG:** * **Hourly Rate Shortcut (4-2-1 Rule):** For a 25 kg child, the hourly rate is $(4 \times 10) + (2 \times 10) + (1 \times 5) = 65 \text{ ml/hr}$. Multiplying $65 \times 24$ hours also yields approximately 1560–1600 ml/day. * **Standard Fluid Choice:** Isotonic solutions (e.g., 0.9% Normal Saline) are now preferred over hypotonic solutions (like 0.18% NS) for maintenance in hospitalized children to prevent **iatrogenic hyponatremia**. * **Exceptions:** Maintenance fluids should be reduced in conditions like SIADH, oliguric renal failure, or congestive heart failure, and increased in cases of fever (12% increase for every 1°C rise) or tachypnea.

Question 49: Which of the following is NOT true about Asystole?

A. It is the most common cause of cardiac arrest in children.
B. The sequence of resuscitation is airway, breathing, then circulation (c-a-b).
C. Defibrillation is performed as early as possible. (Correct Answer)
D. Epinephrine is the drug of choice.

Explanation: In pediatric advanced life support (PALS), cardiac arrest is categorized into **shockable** (Ventricular Fibrillation, Pulseless Ventricular Tachycardia) and **non-shockable** (Asystole, Pulseless Electrical Activity) rhythms. ### **Why Option C is the Correct Answer (The False Statement)** Asystole is a **non-shockable rhythm**. Defibrillation is used to terminate disorganized electrical activity (like VF/pVT) to allow the heart's natural pacemaker to take over. In asystole, there is a total absence of electrical activity; applying an electric shock is not only ineffective but can cause further myocardial damage and parasympathetic surge, delaying effective CPR. ### **Analysis of Other Options** * **Option A:** True. Unlike adults, where primary cardiac events (VF) are common, pediatric arrests are usually secondary to respiratory failure or shock, leading to progressive bradycardia and eventually **asystole**, making it the most common arrest rhythm in children. * **Option B:** True. Per the latest AHA/PALS guidelines, the sequence for all cardiac arrests is **C-A-B** (Circulation, Airway, Breathing) to minimize interruptions in chest compressions. * **Option D:** True. **Epinephrine** is the primary vasopressor used in asystole to increase coronary perfusion pressure. In non-shockable rhythms, it should be administered as soon as possible. ### **Clinical Pearls for NEET-PG** * **Drug of Choice:** Epinephrine (0.01 mg/kg or 0.1 ml/kg of 1:10,000 concentration). * **Reversible Causes:** Always screen for the **6 H’s and 5 T’s** (Hypovolemia, Hypoxia, Hydrogen ion/Acidosis, Hypo/Hyperkalemia, Hypoglycemia, Hypothermia; Toxins, Tamponade, Tension pneumothorax, Thrombosis-coronary/pulmonary). * **Shock Energy:** For shockable rhythms, start at **2 J/kg**, then **4 J/kg**, with a maximum of 10 J/kg.

Question 50: What is the most common feature of polytrauma in the pediatric age group?

A. Hypothermia
B. Hypovolemic shock (Correct Answer)
C. Hypotension
D. Hypoxemia

Explanation: **Explanation:** In pediatric polytrauma, **Hypovolemic shock** (specifically hemorrhagic shock) is the most common life-threatening feature. Children have a smaller total blood volume compared to adults, meaning even relatively small amounts of blood loss can lead to significant circulatory compromise. **Why Hypovolemic Shock is the Correct Answer:** The pediatric physiological response to trauma is unique. Children have a high physiological reserve and potent compensatory mechanisms (tachycardia and peripheral vasoconstriction). This allows them to maintain a normal blood pressure even after losing up to **25–30% of their circulating blood volume**. Therefore, while the child is in a state of "compensated" hypovolemic shock, their clinical signs may be subtle (e.g., delayed capillary refill or tachycardia) before a sudden collapse occurs. **Analysis of Incorrect Options:** * **Hypotension:** This is a **late and pre-terminal sign** in pediatric trauma. Because children compensate so well, by the time hypotension develops, the child has usually lost >45% of their blood volume (decompensated shock). * **Hypothermia:** While common due to a child’s large surface-area-to-mass ratio, it is a *complication* or part of the "lethal triad" rather than the primary hemodynamic feature of trauma. * **Hypoxemia:** While airway management is the priority (ABCDE), hypoxemia is usually secondary to specific injuries (e.g., tension pneumothorax or airway obstruction) rather than a universal feature of systemic polytrauma. **High-Yield Pearls for NEET-PG:** * **The "Lethal Triad" in Trauma:** Acidosis, Coagulopathy, and Hypothermia. * **Blood Volume:** An infant’s blood volume is ~80-90 mL/kg; a child’s is ~70-80 mL/kg. * **First Sign of Shock:** Tachycardia is usually the earliest sign, but it must be differentiated from pain or anxiety. * **Fluid Resuscitation:** The initial bolus for pediatric shock is **20 mL/kg** of isotonic crystalloid (Normal Saline or Ringer's Lactate).

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Respiratory Failure

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Shock

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Cardiopulmonary Resuscitation

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Acute Respiratory Distress Syndrome

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Mechanical Ventilation in Children

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Sedation and Analgesia

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Status Epilepticus

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Diabetic Ketoacidosis

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Pediatric Trauma

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Poisoning and Toxidromes

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Near-Drowning

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Multiple Organ Dysfunction Syndrome

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