Pediatric Critical Care — MCQs

Pediatric Critical Care Indian Medical PG Practice Questions and MCQs

Question 61: What is the normal capillary refill time in a child?

A. Less than 1 second
B. 1-2 seconds
C. 2-3 seconds (Correct Answer)
D. More than 3 seconds

Explanation: **Explanation:** **Capillary Refill Time (CRT)** is a rapid clinical assessment tool used to evaluate peripheral perfusion and distal circulatory status. In a healthy child, the normal CRT is considered to be **up to 2 seconds (often cited as <3 seconds)**. Therefore, the range of **2-3 seconds** is the standard clinical threshold for normal perfusion in pediatric practice. * **Why Option C is correct:** According to standard pediatric advanced life support (PALS) and IMNCI guidelines, a CRT of less than 3 seconds is normal. It indicates that the cardiac output is sufficient to maintain peripheral tissue perfusion. * **Why Options A & B are incorrect:** While a CRT of 1 or 2 seconds is technically "normal," these options are too narrow. A child with a CRT of 2.5 seconds is still considered hemodynamically stable; thus, the broader range of 2-3 seconds better defines the upper limit of normalcy. * **Why Option D is incorrect:** A CRT of **more than 3 seconds** is considered **prolonged**. This is a critical clinical sign of poor peripheral perfusion, often seen in dehydration, shock (hypovolemic, cardiogenic, or septic), or hypothermia. **High-Yield Clinical Pearls for NEET-PG:** 1. **Technique:** Press the nail bed or pulp of the finger/toe (or the sternum in infants) for 5 seconds at the level of the heart. 2. **Environmental Factor:** Ambient temperature significantly affects CRT. Cold environments can prolong CRT even in the absence of shock. 3. **Shock Assessment:** Prolonged CRT is one of the earliest signs of **compensated shock** in children, along with tachycardia. 4. **Dehydration:** In a child with diarrhea, a CRT >2 seconds is a key predictor of at least 5% dehydration.

Question 62: A 6-year-old child has a foreign body in the trachea. What is the best initial management?

A. Heimlich's maneuver (Correct Answer)
B. Cardiac massage
C. Intubation
D. Oxygen mask with intermittent positive pressure ventilation (IPPV)

Explanation: **Explanation:** The primary goal in a child with a suspected foreign body (FB) airway obstruction is the immediate relief of the mechanical blockage. **1. Why Heimlich’s Maneuver is correct:** The **Heimlich maneuver (subdiaphragmatic abdominal thrusts)** is the standard initial management for children over 1 year of age with a complete airway obstruction. It works by elevating the diaphragm, which increases intrathoracic pressure and creates an "artificial cough," forcing air out of the lungs to expel the foreign body from the trachea or larynx. **2. Why other options are incorrect:** * **Cardiac massage:** This is indicated for cardiac arrest (Pulselessness). While airway obstruction can lead to arrest, the immediate priority is clearing the airway. * **Intubation:** This is contraindicated as an initial step because the tube may push the foreign body deeper into the tracheobronchial tree, worsening the obstruction. It is only considered if basic maneuvers fail and the airway must be bypassed. * **Oxygen mask with IPPV:** Positive pressure ventilation is ineffective if the airway is mechanically blocked; it may also push the object further down. **Clinical Pearls for NEET-PG:** * **Age-specific management:** * **< 1 year (Infants):** 5 back blows followed by 5 chest thrusts. (Abdominal thrusts are avoided due to risk of liver injury). * **> 1 year (Children/Adults):** Heimlich maneuver. * **Gold Standard Diagnosis:** Rigid Bronchoscopy is the definitive method for both diagnosis and removal of a tracheobronchial FB. * **Most common site:** Right main bronchus (due to it being wider, shorter, and more vertical). * **Classic Triad:** Sudden onset of coughing, wheezing, and diminished breath sounds.

Question 63: A 7-year-old male child was brought to the EMR 6 hours after a burn and was having 22% BSA burns. On examination, cool extremities, BP - 92/50mmHg, PR - 56 BPM. Urine output since burn episode: 30ml. What is the next step in management?

A. Give a colloid bolus
B. Give bolus at 30ml / kg / hr
C. Give crystalloid bolus of 10-20 ml/kg (Correct Answer)
D. Surgical Intervention

Explanation: ***Give crystalloid bolus of 10-20 ml/kg*** - Child presents with **hypovolemic shock** (cool extremities, hypotension, bradycardia, oliguria) - Signs indicate inadequate initial resuscitation despite 6 hours post-burn - Immediate management: **rapid crystalloid bolus of 10-20 ml/kg** (Ringer's lactate or normal saline) over 20-60 minutes - After stabilization, continue calculated Parkland formula resuscitation - Target urine output: **1-2 ml/kg/hr** in children *Give a colloid bolus* - Colloids (albumin, plasma) are **not first-line** in initial burn resuscitation - Crystalloids (Ringer's lactate) are preferred initially due to better efficacy and lower cost - Colloids may be considered later if crystalloid requirements are excessive *Give bolus at 30ml/kg/hr* - This rate is **excessively high** and inappropriate - Risk of fluid overload, pulmonary edema, and compartment syndrome - Standard bolus is 10-20 ml/kg given rapidly, not as an hourly rate *Surgical Intervention* - Not the **immediate priority** in shock management - **Resuscitation before surgery** is the principle in trauma care - Surgical debridement/escharotomy may be needed later after stabilization

Question 64: Which of the following is not a correct match for ABCD according to pediatric advanced life support?

A. Circulation
B. Airway
C. Dehydration (Correct Answer)
D. Breathing

Explanation: ***Dehydration*** - In the mnemonic **ABCD** used in **Pediatric Advanced Life Support (PALS)** and basic life support (BLS), D stands for **Disability** (neurological status/deficit), not Dehydration. - Assessing **Disability** involves evaluating the infant's or child's neurological status using tools like the **AVPU scale** or **Glasgow Coma Scale (GCS)**. *Airway* - A stands correctly for **Airway** in the **ABCD** approach, focusing on ensuring a patent passage for breathing. - This step involves opening the airway using maneuvers like the **head tilt/chin lift** (for trauma absence) or **jaw thrust** (for suspected trauma). *Breathing* - B stands correctly for **Breathing**, which assesses the presence and adequacy of respiratory effort. - Management includes providing rescue breaths, using devices like a **bag-mask device**, and determining the need for **intubation**. *Circulation* - C stands correctly for **Circulation**, which evaluates heart rate, pulse strength, capillary refill time, and skin color. - Interventions include initiating **chest compressions** if a pulse is absent or too slow/weak, and managing **shock** (e.g., fluid resuscitation/medications).

Question 65: An unconscious child is brought to the casualty. What is the correct sequence of the management?

A. Circulation, Airway, Breathing
B. Breathing, Circulation, Airway
C. Circulation, Breathing, Airway
D. Airway, Breathing, Circulation (Correct Answer)

Explanation: ***Airway, Breathing, Circulation*** - The **ABC sequence** is the cornerstone of pediatric resuscitation as per **PALS (Pediatric Advanced Life Support) guidelines** - In an unconscious child, a patent **airway** is the absolute first priority - without this, no oxygen can reach the lungs regardless of breathing effort - Once airway patency is ensured, **breathing** must be assessed and supported to provide adequate ventilation and oxygenation - Only after securing airway and breathing should **circulation** be addressed, as effective circulation without oxygenation is futile - This sequence prevents **hypoxic brain injury**, which can occur within 4-6 minutes of oxygen deprivation *Circulation, Airway, Breathing* - This violates the fundamental **ABC principle** of emergency management - Prioritizing **circulation** before establishing a patent **airway** means attempting to circulate deoxygenated blood - Without airway patency, any circulatory support will fail to deliver oxygen to vital organs, leading to **irreversible hypoxic damage** - In pediatric emergencies, respiratory failure is more common than primary cardiac arrest, making airway management even more critical *Breathing, Circulation, Airway* - Attempting to support **breathing** before securing the **airway** is physiologically ineffective - An obstructed airway prevents air entry despite breathing efforts or bag-mask ventilation attempts - This sequence can lead to **gastric distension, aspiration**, and worsening hypoxia - Delays in airway management increase the risk of **cardiac arrest** from prolonged hypoxemia *Circulation, Breathing, Airway* - This sequence dangerously delays **airway management**, the most time-critical intervention - In an unconscious child, airway obstruction from tongue falling back or secretions is common and immediately life-threatening - Without a patent airway, neither breathing support nor circulatory measures can prevent **brain death** from anoxia - Following this sequence contradicts all **international resuscitation guidelines** (PALS, AHA, ERC)

Question 66: A child presented to the casualty department with fever, unconsciousness, and papilledema. What is the next step?

A. Oxygenation
B. Intubation (Correct Answer)
C. CT scan
D. All of the options

Explanation: **Intubation** - The presence of **unconsciousness** indicates a compromised airway and breathing, making immediate **airway management** and **ventilatory support** a priority. - Papilledema, fever, and unconsciousness suggest increased **intracranial pressure** which can lead to brainstem herniation and respiratory arrest, necessitating **controlled ventilation** to reduce CO2 and ICP. *Oxygenation* - While **oxygenation** is critical, it is often insufficient alone in an unconscious patient with a compromised airway. - **Intubation** ensures a patent airway and delivers controlled oxygenation and ventilation more effectively than oxygenation via mask in this situation. *CT scan* - A **CT scan** is a diagnostic tool, but it should only be performed after the patient is **stabilized** hemodynamically and respiratory-wise. - Transporting an **unconscious** patient with potential increased ICP for a CT scan without securing the airway carries significant risks. *All of the options* - While all listed steps are important in managing a child with these symptoms, **intubation** (airway and breathing stabilization) is the **most immediate and critical next step**. - The sequence of medical interventions follows the **ABC (Airway, Breathing, Circulation)** protocol, making airway management the top priority before diagnostics or other treatments.

Question 67: Swiping of the oral cavity should not be done in foreign body aspiration in children because:

A. It can trigger vomiting and aspiration
B. Leads to inadvertently pushing the foreign body deep into the respiratory system (Correct Answer)
C. It is not effective in removing foreign bodies from children
D. It may cause trauma to the oral cavity and throat

Explanation: **Leads to inadvertently pushing the foreign body deep into the respiratory system** - Forceful or blind **finger sweeps** in children can dislodge a foreign body from a superficial position and push it further into the hypopharynx or trachea, potentially causing **complete airway obstruction**. - This maneuver is particularly risky in infants and young children due to their smaller and more **fragile airways**. - Current pediatric basic life support (BLS) guidelines explicitly advise **against blind finger sweeps** in children with foreign body airway obstruction. *It may cause trauma to the oral cavity and throat* - While trauma can occur, such as **lacerations** or **abrasions** to the soft tissues, it is a secondary concern. - The primary and most dangerous risk is the complete **airway obstruction** from pushing the object deeper into the respiratory tract. *It is not effective in removing foreign bodies from children* - The ineffectiveness is a valid point, but the main reason for avoiding it is the inherent danger. - Even if it were effective in some cases, the risk of worsening the airway obstruction is too high to recommend it as a routine intervention. *It can trigger vomiting and aspiration* - While gagging and stimulation can occur with oral manipulation, this is not the primary concern in foreign body aspiration. - The immediate risk of pushing an already-aspirated object deeper into the airway takes precedence over the theoretical risk of triggering vomiting.

Question 68: How is catecholamine resistant shock managed in children?

A. Hydrocortisone (Correct Answer)
B. Nor-adrenaline
C. Activated protein-C
D. Vasopressin

Explanation: ***Hydrocortisone*** - **Hydrocortisone** is the primary treatment for catecholamine-resistant shock in children by addressing the underlying mechanism of receptor unresponsiveness. - It works by **upregulating adrenergic receptors** on vascular smooth muscle, restoring sensitivity to endogenous and exogenous catecholamines. - Additionally provides anti-inflammatory effects and treats relative adrenal insufficiency, which is common in prolonged shock states. - **Standard dosing:** 50-100 mg/m² or 1-2 mg/kg every 6 hours in pediatric shock. *Nor-adrenaline* - **Nor-adrenaline** is a potent catecholamine (alpha and beta agonist) already used in shock management. - In catecholamine-resistant shock, adrenergic receptors are **desensitized or downregulated**, making additional catecholamines less effective. - This is part of the existing therapy that has failed, not the solution to resistance. *Activated protein-C* - **Activated protein-C** (drotrecogin alfa) was used in severe sepsis but has been **withdrawn from the market** due to lack of efficacy and increased bleeding risk. - Not recommended in current pediatric shock guidelines. - Does not address catecholamine receptor unresponsiveness. *Vasopressin* - **Vasopressin** is an important adjunctive agent for catecholamine-resistant shock, acting through **V1 receptors** (non-adrenergic pathway). - Provides vasoconstriction when adrenergic receptors are unresponsive, making it useful in refractory cases. - However, it does not restore catecholamine receptor sensitivity—it bypasses the problem rather than correcting it. - **Hydrocortisone** is preferred as the primary intervention because it addresses the underlying receptor dysfunction, while vasopressin serves as an alternative vasopressor pathway.

Question 69: Hera Lal's 10-year-old child presents in casualty with a snakebite sustained six hours ago. On examination, no systemic signs are found, and lab investigations are normal except for localized swelling over the leg of < 5 cm. The next step in management would be -

A. Incision and suction of local swelling
B. Observe the patient for progression of symptoms and wait for antivenom therapy (Correct Answer)
C. I/V polyvalent antivenom
D. Subcutaneous antivenom at local swelling

Explanation: **Observe the patient for progression of symptoms and wait for antivenom therapy** - In cases of snakebite with only **local swelling less than 5 cm** and **no systemic signs** or abnormal lab investigations, observation is the appropriate initial management. - Antivenom is typically reserved for patients who develop **progressive local symptoms** or **any systemic signs** of envenomation. *Incision and suction of local swelling* - **Incision and suction** are generally **contraindicated** in snakebite management as they can worsen local tissue damage and are not effective in removing venom. - This practice can also increase the risk of **secondary infection**. *I/V polyvalent antivenom* - **Intravenous polyvalent antivenom** is indicated for **systemic envenomation** or rapidly progressing local signs, which are absent in this case. - Administering antivenom without clear indications exposes the patient to potential **adverse reactions**, including anaphylaxis. *Subcutaneous antivenom at local swelling* - **Subcutaneous administration of antivenom** is **ineffective** and not recommended, as it does not achieve therapeutic venom-neutralizing concentrations. - Antivenom must be given **intravenously** to ensure rapid and widespread distribution to counteract systemic effects.

Question 70: A child presents with respiratory distress. A vascular ring is suspected. Investigation of choice is -

A. Angiography
B. MRI (Correct Answer)
C. CT
D. PET

Explanation: ***MRI/MRA*** - **Magnetic Resonance Imaging (MRI) with MR Angiography** provides excellent visualization of the **aortic arch** and its branches without ionizing radiation, making it ideal for pediatric patients with suspected **vascular rings**. - MRI clearly delineates **vascular anatomy, tracheal and esophageal compression**, confirming the diagnosis and guiding surgical planning. - Particularly preferred when **radiation-free imaging** is prioritized in children. *CT Angiography* - **CT Angiography (CTA) with 3D reconstruction** provides excellent vascular imaging and is widely used for vascular ring diagnosis in many centers. - **Advantage**: Faster acquisition time, less need for sedation, excellent anatomical detail with 3D reconstruction. - **Disadvantage**: Involves **ionizing radiation** exposure, which is a concern in pediatric patients when equally diagnostic radiation-free alternatives exist. - Both MRI and CTA are considered appropriate first-line investigations; choice depends on institutional expertise and clinical context. *Conventional Angiography* - **Catheter angiography** is invasive, involves radiation, and has been largely replaced by non-invasive cross-sectional imaging (MRI/CT). - May be reserved for cases requiring intervention or when non-invasive imaging is inconclusive. *PET* - **Positron Emission Tomography (PET)** detects metabolic activity and is used for cancer or inflammation, not for **anatomical vascular anomalies**. - Not indicated for vascular ring diagnosis.

Practice by Chapter

Respiratory Failure

Practice Questions

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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