Pediatric Critical Care Practice Questions

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

Atropine. 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).

Q: Which of the following is NOT true about Asystole?

Defibrillation is performed as early as possible.. 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.

Q: What is the treatment of choice for a child presenting with seizures and hyponatremia?

3% NaCl. **Explanation:** The correct answer is **D. 3% NaCl**. **Why 3% NaCl is the Treatment of Choice:** In a child presenting with seizures due to hyponatremia, the primary goal is to rapidly increase serum sodium levels to reduce cerebral edema. **3% NaCl (Hypertonic Saline)** is the treatment of choice for **symptomatic hyponatremia** (seizures, coma, or altered sensorium). It provides a high osmotic gradient that shifts water out of the brain cells, effectively terminating the seizure and preventing brain herniation. **Why other options are incorrect:** * **A. 0.9% NaCl (Isotonic Saline):** While used for volume resuscitation in shock, it does not raise serum sodium levels rapidly enough to treat acute neurological emergencies caused by hyponatremia. * **B. 0.45% NaCl (Half-normal Saline):** This is a hypotonic solution. Administering it would further lower serum sodium, worsening cerebral edema and potentially proving fatal. * **C. Dextrose + NaCl:** Dextrose solutions become hypotonic once the glucose is metabolized, which is contraindicated in the management of acute hyponatremic seizures. **Clinical Pearls for NEET-PG:** * **Dosage:** The standard dose of 3% NaCl in emergencies is **3–5 mL/kg IV over 10–20 minutes**. * **Correction Limit:** Avoid raising serum sodium by more than **10–12 mEq/L in 24 hours** to prevent **Osmotic Demyelination Syndrome (ODS)**, formerly known as Central Pontine Myelinolysis. * **Target:** The goal of hypertonic saline is not to reach normal sodium levels immediately, but to raise it by **4–6 mEq/L**, which is usually sufficient to stop seizures.

Q: What is the normal cerebral perfusion pressure in children?

40-60 mm Hg. **Explanation:** Cerebral Perfusion Pressure (CPP) is the net pressure gradient that drives oxygen delivery to cerebral tissue. It is calculated using the formula: **CPP = MAP – ICP** (where MAP is Mean Arterial Pressure and ICP is Intracranial Pressure). **Why Option D is Correct:** In the pediatric population, the normal range for CPP is generally **40–60 mm Hg**. Maintaining this range is critical to ensure adequate cerebral blood flow while avoiding secondary brain injury. While adults typically require a CPP >60 mm Hg, children have lower baseline systemic blood pressures, and thus, a lower threshold for adequate perfusion is physiological. In pediatric traumatic brain injury (TBI) management, the goal is often to maintain CPP at the higher end of this range (minimum 40–50 mm Hg). **Analysis of Incorrect Options:** * **Options A & B (11-20 mm Hg):** These values are far too low for perfusion. In fact, these ranges (specifically 10–15 mm Hg) represent the **normal range for Intracranial Pressure (ICP)** in older children. A CPP this low would result in immediate cerebral ischemia. * **Option C (20-40 mm Hg):** While closer, this range is considered borderline or inadequate. A CPP consistently below 40 mm Hg in children is associated with poor neurological outcomes and global brain ischemia. **High-Yield Clinical Pearls for NEET-PG:** * **Normal ICP by Age:** Newborns: 2–6 mm Hg; Infants: 3–7 mm Hg; Children: 10–15 mm Hg. * **Cushing’s Triad (Sign of ↑ ICP):** Hypertension, Bradycardia, and Irregular Respirations. * **Management:** To improve CPP, clinicians must either increase the MAP (using fluids/vasopressors) or decrease the ICP (using head elevation, hyperventilation, or osmotic therapy like Mannitol/Hypertonic saline).

Q: Which of the following is NOT a criterion for diagnosing Systemic Inflammatory Response Syndrome (SIRS)?

More than 50% immature neutrophils. To diagnose **Systemic Inflammatory Response Syndrome (SIRS)** in the pediatric population, specific clinical and laboratory criteria must be met. According to the International Pediatric Sepsis Consensus Conference, SIRS requires the presence of at least **two** of the four criteria, one of which **must** be abnormal temperature or leukocyte count. ### Why Option D is the Correct Answer Option D is incorrect because the threshold for immature neutrophils (bands) is **>10%**, not >50%. While an elevated immature-to-total neutrophil ratio is a hallmark of the inflammatory response, a 50% cutoff is clinically extreme and not part of the diagnostic criteria. ### Explanation of Other Options (SIRS Criteria) * **Option A (Temperature):** Core temperature of **>38.5°C or 2 standard deviations (SD) above normal** for age or the need for mechanical ventilation (not related to underlying neuromuscular disease) is a valid criterion. * **Option C (Heart Rate):** Tachycardia is standard, but in **infants 0.5 hours is a specific and recognized criterion. ### NEET-PG High-Yield Pearls * **Mandatory Requirement:** Unlike adults, pediatric SIRS **cannot** be diagnosed without either an abnormal temperature or an abnormal white blood cell count. * **WBC Criterion:** Leukocyte count elevated or depressed for age (not secondary to chemotherapy) OR **>10% immature neutrophils**. * **Sepsis Definition:** Sepsis is defined as **SIRS + suspected or proven infection**. * **Severe Sepsis:** Sepsis plus cardiovascular dysfunction, ARDS, or two or more other organ dysfunctions.

Question 1

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

Accepted Answer

Atropine

Answer

Chest compression

Answer

Adrenaline

Answer

Endotracheal tube intubation

Question 2

Which of the following is NOT true about Asystole?

Accepted Answer

Defibrillation is performed as early as possible.

Answer

It is the most common cause of cardiac arrest in children.

Answer

The sequence of resuscitation is airway, breathing, then circulation (c-a-b).

Answer

Epinephrine is the drug of choice.

Question 3

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

Accepted Answer

Hypovolemic shock

Answer

Hypothermia

Answer

Hypotension

Answer

Hypoxemia

Question 4

What is the treatment of choice for a child presenting with seizures and hyponatremia?

Accepted Answer

3% NaCl

Answer

0.9% NaCl

Answer

0.45% NaCl

Answer

Dextrose + NaCl

Question 5

What is the best parameter to monitor the response to injection of a bolus dose of fluids in a dehydrated child?

Accepted Answer

Radial pulse

Answer

Skin turgor

Answer

Difference between core and surface temperature

Answer

Capillary refilling time

Question 6

What is the initial management of iron poisoning in a 4-year-old child?

Accepted Answer

Administer a blood transfusion

Answer

Gastric lavage

Answer

Administer Desferrioxamine intravenously at 100 mg

Answer

Obtain an X-ray of the abdomen

Question 7

What is the normal cerebral perfusion pressure in children?

Accepted Answer

40-60 mm Hg

Answer

11-15 mm Hg

Answer

16-20 mm Hg

Answer

20-40 mm Hg

Question 8

Which of the following is NOT a criterion for diagnosing Systemic Inflammatory Response Syndrome (SIRS)?

Accepted Answer

More than 50% immature neutrophils

Answer

Temperature > 38.5°C or < 36°C

Answer

Respiratory rate > 2 standard deviations above normal for age

Answer

In infants < 1 year, persistent bradycardia over 0.5 hour

Question 9

Convulsions in a child with dehydration and vomiting can only be due to which of the following?

Accepted Answer

Decreased serum sodium

Answer

Decreased serum magnesium

Answer

Decreased serum potassium

Answer

Decreased serum potassium

Question 10

A 2-year-old unresponsive child presents to casualty following a fall from a height. On examination, the child is intermittently responsive to verbal stimuli, with a respiratory rate of 30/min, pulse of 130/min, SpO2 of 94%, and BP of 104/60 mm Hg. What is the next step in management?

Accepted Answer

Administer oxygen via face mask, immobilize the cervical spine, and transfer to a tertiary center accompanied by a doctor.

Answer

Observe the child carefully and transfer if necessary.

Answer

Transfer immediately to a tertiary center for CT scan of the brain and further management.

Answer

Administer oxygen via face mask and give mannitol.

Pediatric Critical Care — MCQs

Pediatric Critical Care — MCQs

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