Pediatric Critical Care — MCQs

Pediatric Critical Care Indian Medical PG Practice Questions and MCQs

Question 81: What is the most appropriate initial fluid for severe dehydration with shock in a 2-year-old with acute gastroenteritis?

A. Half-strength saline
B. Normal saline bolus (Correct Answer)
C. Ringer lactate
D. ORS

Explanation: ***Normal saline bolus*** - **Normal saline (0.9% NaCl)** is an appropriate initial fluid for **severe dehydration with shock** due to its **isotonicity**, which helps rapidly expand intravascular volume without causing fluid shifts. - In a 2-year-old with shock, rapid resuscitation with **20 mL/kg bolus** of isotonic fluid is critical for restoring circulating blood volume. - In **acute gastroenteritis**, normal saline may be particularly appropriate as it helps replace **sodium and chloride losses** from diarrhea and vomiting. *Half-strength saline* - **Half-strength saline (0.45% NaCl)** is **hypotonic** and is **contraindicated** for initial resuscitation in shock, as it cannot effectively expand intravascular volume. - It can cause fluid to shift into the intracellular space, worsening hypotension and potentially causing **hyponatremia** and **cerebral edema**. - Hypotonic solutions are only used for maintenance therapy after stabilization, never for shock resuscitation. *Ringer lactate* - **Lactated Ringer's** is also an **isotonic crystalloid** and is equally acceptable for shock resuscitation in children according to current PALS guidelines. - Both NS and LR are recommended first-line fluids for pediatric shock, though **NS may be preferred in gastroenteritis** as it more directly replaces the specific electrolyte losses (Na+ and Cl-) typical of diarrheal dehydration. - LR contains lactate that is metabolized to bicarbonate, making it slightly hypotonic and containing less sodium than NS, which may be less ideal for gastroenteritis-specific losses. *ORS* - **Oral Rehydration Solution (ORS)** is the treatment of choice for **mild to moderate dehydration** but is **contraindicated in shock** due to hemodynamic instability requiring immediate intravenous volume expansion. - A child in shock cannot absorb fluids adequately from the GI tract and requires rapid IV resuscitation before oral therapy can be considered. - ORS is only appropriate after initial stabilization with IV fluids and restoration of adequate perfusion.

Question 82: A newborn has a heart rate <60 bpm despite 30 seconds of adequate positive pressure ventilation. What is the next step?

A. Start IV fluids
B. Begin chest compressions (Correct Answer)
C. Administer adrenaline
D. Increase oxygen flow

Explanation: ***Begin chest compressions*** - According to **neonatal resuscitation guidelines (NRP)**, if the heart rate remains below 60 beats per minute despite 30 seconds of effective **positive pressure ventilation (PPV)**, chest compressions should be initiated. - Chest compressions are administered at a ratio of 3 compressions to 1 breath, aiming for a rate of 90 compressions and 30 breaths per minute. *Start IV fluids* - **IV fluids** are generally considered in cases of documented or suspected **hypovolemia** or shock that does not respond to initial resuscitative efforts. - They are not the immediate next step for a newborn with a heart rate below 60 after oxygenation and ventilation. *Administer adrenaline* - **Adrenaline (epinephrine)** is typically given if the heart rate remains below 60 bpm despite adequate ventilations and chest compressions. - It is often administered intravenously or intraosseously, or via an endotracheal tube if IV/IO access is not immediately available. *Increase oxygen flow* - The initial step for a bradycardic newborn is usually effective **positive pressure ventilation** with appropriate oxygen concentration, often starting with 21% or higher depending on gestational age and clinical status. - Simply increasing oxygen flow without ensuring effective ventilation will not adequately address the underlying respiratory failure and persistent bradycardia.

Question 83: What is the main goal of fluid resuscitation in a child with septic shock?

A. Increase urine output
B. Reduce heart rate
C. Decrease fever
D. Restore blood pressure (Correct Answer)

Explanation: ***Restore blood pressure*** - In septic shock, **vasodilation** and extravasation of fluids lead to decreased **effective circulating volume** and profound **hypotension**. - Aggressive fluid resuscitation is critical to restore adequate **mean arterial pressure** and improve **organ perfusion**. *Increase urine output* - While increased urine output is a positive sign of improved renal perfusion, it is a **consequence** of successful resuscitation rather than the primary goal. - The main focus is on addressing the circulatory dysfunction that leads to **oliguria** in the first place. *Reduce heart rate* - A **high heart rate** (tachycardia) in septic shock is a compensatory mechanism to maintain **cardiac output** in the face of reduced preload and systemic vascular resistance. - Reducing heart rate directly is not the primary goal of fluid resuscitation and may even be harmful if **cardiac output** is already compromised. *Decrease fever* - Fever is a systemic inflammatory response to infection and is typically managed with **antipyretics**, not primarily with fluid resuscitation. - While fluids can help prevent complications of hyperthermia like dehydration, the main goal in shock is **hemodynamic stabilization**.

Question 84: A child presents with high grade fever, inspiratory stridor and develops swallowing difficulty with drooling of saliva since last 4-6 hours. Which of the following treatment is recommended apart from general airway management?

A. IV ceftriaxone (Correct Answer)
B. Anti-diphtheria toxin
C. Corticosteroids
D. Nebulized racemic epinephrine

Explanation: ***IV ceftriaxone*** - The symptoms (high-grade fever, inspiratory stridor, swallowing difficulty with drooling, rapid onset) are highly suggestive of **acute epiglottitis**, a life-threatening emergency. - **Empiric intravenous antibiotics** like ceftriaxone are crucial for treating the bacterial infection (commonly *Haemophilus influenzae* type b or *Streptococcus pneumoniae*) causing epiglottitis. *Anti-diphtheria toxin* - This treatment is specific for **diphtheria**, which causes a pseudomembrane and can lead to airway obstruction, but the clinical picture here is more consistent with epiglottitis due to its rapid and severe presentation without mention of a pseudomembrane. - Diphtheria typically has a more gradual onset and is characterized by a **grayish pseudomembrane** in the throat, unmentioned in this case. *Corticosteroids* - While corticosteroids are used in other forms of upper airway obstruction (like **croup**), their role in acute epiglottitis is controversial and not a primary life-saving measure; antibiotics and airway management are paramount. - Their primary benefit lies in reducing inflammation, but they do not address the acute bacterial cause of epiglottitis directly and are secondary to antibiotics. *Nebulized racemic epinephrine* - This treatment is primarily used for **laryngotracheobronchitis (croup)**, which presents with a barking cough and stridor, but typically lacks the high fever and severe drooling seen in epiglottitis. - Nebulized racemic epinephrine helps to reduce subglottic edema in croup but would not be effective against the severe supraglottic swelling of epiglottitis, nor would it treat the underlying bacterial infection.

Question 85: Which of the following statements about the ABCDE approach in pediatric Advanced Life Support (PALS) is incorrect?

A. Dehydration is a component of the ABCDE approach. (Correct Answer)
B. Airway management is essential in PALS.
C. Breathing assessment is part of the ABCDE approach.
D. Circulation is a critical component of the ABCDE approach.

Explanation: ***Dehydration is a component of the ABCDE approach.*** - The **ABCDE approach** in PALS focuses on **Airway, Breathing, Circulation, Disability, and Exposure**, which are immediate life threats. - While dehydration is a crucial clinical concern in children, it's a **diagnostic consideration** and management target, not a primary component of the initial rapid assessment categories (A, B, C, D, E) themselves. - Dehydration may affect circulation (C) but is not itself a separate component of the ABCDE framework. *Airway management is essential in PALS.* - **Airway** is the first step in the ABCDE approach, focusing on ensuring a **patent and protected airway** to allow for effective ventilation. - **Airway management** is critical in pediatric resuscitation to prevent respiratory arrest and optimize oxygen delivery. *Breathing assessment is part of the ABCDE approach.* - **Breathing** is the second step, involving the assessment of **respiratory rate, effort, breath sounds, and oxygen saturation**. - Effective breathing is vital for adequate **oxygenation and ventilation**, and addressing breathing problems is a key part of PALS. *Circulation is a critical component of the ABCDE approach.* - **Circulation** is the third step, involving the assessment of **heart rate, blood pressure, capillary refill time, and peripheral perfusion**. - **Circulatory assessment** helps identify shock or cardiac arrest, which require immediate intervention. - The complete ABCDE also includes **Disability** (neurological status assessment using AVPU or GCS) and **Exposure** (full examination while preventing hypothermia).

Question 86: A 2-year-old child presented with drowsiness followed by unconsciousness and seizures after missing breakfast. On examination, the child was cold and clammy. What is the most likely diagnosis?

A. Hypoglycemic seizure (Correct Answer)
B. Inborn error of metabolism
C. Diabetic ketoacidosis (DKA)
D. Uremic encephalopathy due to renal failure

Explanation: ***Hypoglycemic seizure*** - **Hypoglycemia** is a common cause of seizures and altered consciousness in young children due to their limited glycogen stores and high metabolic rate. - The symptoms of **drowsiness, unconsciousness, and seizures** after missing a meal, along with **cold and clammy skin** (sympathetic response), are classic presentations of severe hypoglycemia affecting brain function. - The acute onset following fasting and rapid progression suggest simple hypoglycemia rather than a chronic metabolic condition. *Inborn error of metabolism* - While inborn errors of metabolism can cause hypoglycemia and seizures, they typically present with recurrent episodes, failure to thrive, developmental delay, or specific metabolic acidosis patterns. - The acute presentation following a missed meal without prior episodes is more consistent with simple hypoglycemia. - IEMs would be considered if there were recurrent episodes or inadequate response to glucose administration. *Diabetic ketoacidosis (DKA)* - DKA typically presents with signs of **hyperglycemia**, such as polyuria, polydipsia, and dehydration, along with metabolic acidosis and ketosis. - While DKA can lead to altered consciousness, it presents with **hyperglycemia** not hypoglycemia, and the clinical picture would include Kussmaul breathing and dehydration. - The cold, clammy skin indicates hypoglycemia rather than the warm, dry skin of DKA. *Uremic encephalopathy due to renal failure* - Uremic encephalopathy is a neurological complication of **severe renal failure**, characterized by a gradual decline in mental status, asterixis, and myoclonus. - This condition would typically have other signs of chronic kidney disease, such as edema, hypertension, growth failure, or abnormal kidney function tests. - The acute presentation following a missed meal does not fit the chronic progressive nature of uremic encephalopathy.

Question 87: In an infant who is choking and conscious, what is the next step after performing back blows?

A. Call for emergency services
B. Check the mouth for foreign objects
C. Perform chest thrusts (Correct Answer)
D. Initiate CPR

Explanation: ***Perform chest thrusts*** - For a choking infant, the **Heimlich maneuver** is not performed; instead, a sequence of **five back blows** followed by **five chest thrusts** is recommended. - Chest thrusts create an artificial cough to dislodge the foreign object, acting as the next critical step in the sequence after back blows. *Call for emergency services* - While calling for emergency services is crucial, it is done **after attempting to clear the airway** with back blows and chest thrusts, especially if the infant is still choking. - Immediate action to dislodge the object takes precedence to prevent loss of consciousness. *Check the mouth for foreign objects* - Checking the mouth is important, but it should be done **after each cycle** of five back blows and five chest thrusts, and only if the object is visible. - Blindly sweeping the mouth is not recommended as it could push the object further down. *Initiate CPR* - CPR (chest compressions and rescue breaths) is initiated only if the infant becomes **unresponsive** and stops breathing, indicating cardiac arrest, not while the infant is still conscious and choking. - The immediate goal is to clear the airway before the infant loses consciousness.

Question 88: During pediatric basic life support (BLS), what is the recommended depth of chest compressions for children?

A. 1 cm
B. 2 cm
C. 5 cm (Correct Answer)
D. 8 cm

Explanation: ***5 cm*** - For children, the recommended chest compression depth is approximately **5 cm (2 inches)**, which is roughly **one-third the anterior-posterior diameter** of the chest. - This depth ensures adequate blood flow to vital organs while minimizing the risk of injury. *1 cm* - A compression depth of **1 cm is too shallow** and would be insufficient to create effective blood circulation in a child. - Inadequate depth can lead to **poor perfusion** and significantly reduce the chances of survival during cardiac arrest. *2 cm* - While greater than 1 cm, **2 cm is still insufficient** for effective chest compressions in most children. - This depth would not generate enough force to circulate blood adequately, leading to **poor outcomes**. *8 cm* - A compression depth of **8 cm is too deep** for a child and could cause serious internal injuries, such as **rib fractures** or damage to vital organs like the lungs or liver. - Such aggressive compressions are typically reserved for adults, where a deeper compression is recommended.

Question 89: A 2-year-old child is brought to the emergency room after a choking episode. Which of the following is the most appropriate immediate management for a conscious child who is choking?

A. Back blows and chest thrusts
B. Finger sweep
C. Start CPR
D. Abdominal thrusts (Correct Answer)

Explanation: ***Abdominal thrusts*** - For a conscious child over 1 year of age who is choking, **abdominal thrusts** (formerly known as the Heimlich maneuver) are the most appropriate immediate intervention to dislodge the foreign object. - This technique creates a sudden increase in **intra-abdominal and thoracic pressure** to expel the obstruction from the airway. - Stand or kneel behind the child, place a fist above the umbilicus, and deliver quick upward thrusts until the object is expelled or the child becomes unconscious. *Back blows and chest thrusts* - **Back blows and chest thrusts** are recommended for **infants under 1 year old** who are choking, not for a 2-year-old child. - This combination is used because abdominal thrusts may cause injury to an infant's liver and spleen. *Finger sweep* - A **blind finger sweep** is not recommended for choking victims, especially in children, as it can push the object further into the airway or cause injury. - Only attempt to remove a foreign body if it is **clearly visible** in the mouth and easily accessible. *Start CPR* - **CPR** is indicated only when a choking victim becomes **unconscious** and unresponsive. - For a conscious choking child, the priority is to clear the airway using abdominal thrusts before respiratory or cardiac arrest occurs.

Question 90: A child with severe COVID-19 developed persistent fever and elevated inflammatory markers 3 weeks after initial infection. What is the next step in management?

A. Begin IVIG therapy (Correct Answer)
B. Administer antiviral therapy
C. Consider transfer to intensive care unit
D. Start high-dose corticosteroids

Explanation: ***Begin IVIG therapy*** - **Intravenous immunoglobulin (IVIG)** is a cornerstone treatment for **Multisystem Inflammatory Syndrome in Children (MIS-C)**, which presents with persistent fever and elevated inflammatory markers post-COVID-19. - IVIG helps modulate the **immune response** and reduce systemic inflammation, crucial for preventing organ damage in MIS-C. *Administer antiviral therapy* - **Antiviral therapy** is most effective when given early in the course of **acute viral infection**, typically within days of symptom onset. - In severe COVID-19 with persistent fever and elevated inflammatory markers, the primary concern shifts from active viral replication to **post-infectious inflammatory complications** like MIS-C. *Consider transfer to intensive care unit* - While a child with severe COVID-19 might eventually require **ICU admission**, it is usually indicated for **respiratory failure**, **hemodynamic instability**, or other signs of severe organ dysfunction. - The initial step for persistent fever and inflammatory markers post-COVID-19 is to target the underlying **hyperinflammatory state** with specific immunotherapy, rather than immediately presuming ICU-level organ failure. *Start high-dose corticosteroids* - **High-dose corticosteroids** are often used in conjunction with IVIG for MIS-C, especially in more severe cases or those unresponsive to IVIG alone. - However, **IVIG** is generally considered the **first-line specific immunomodulatory therapy** for MIS-C, as it has a broader immunomodulatory effect.

Practice by Chapter

Respiratory Failure

Practice Questions

Shock

Practice Questions

Cardiopulmonary Resuscitation

Practice Questions

Acute Respiratory Distress Syndrome

Practice Questions

Mechanical Ventilation in Children

Practice Questions

Sedation and Analgesia

Practice Questions

Status Epilepticus

Practice Questions

Diabetic Ketoacidosis

Practice Questions

Pediatric Trauma

Practice Questions

Poisoning and Toxidromes

Practice Questions

Near-Drowning

Practice Questions

Multiple Organ Dysfunction Syndrome

Practice Questions

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