Pediatric Critical Care Practice Questions

Q: What is the immediate treatment for a 10 kg infant presenting with tetany?

Intravenous calcium gluconate with cardiac monitoring. **Explanation:** **1. Why Option B is Correct:** Tetany is a clinical manifestation of severe hypocalcemia, characterized by increased neuromuscular excitability. The immediate priority is to stabilize the neuronal membranes and prevent life-threatening complications like laryngospasm or seizures. **Intravenous Calcium Gluconate (10%)** is the treatment of choice. In an infant, the standard dose is **1–2 ml/kg (100–200 mg/kg)** given as a slow infusion over 10–20 minutes. **Cardiac monitoring** is mandatory during administration because rapid infusion can cause bradycardia, arrhythmias, or even cardiac arrest. **2. Why Other Options are Incorrect:** * **Option A & C (Diazepam/Phenobarbital):** While tetany can mimic seizure-like activity, these are anticonvulsants. They do not address the underlying biochemical deficiency (low ionized calcium). Using sedatives without correcting the calcium deficit will not stop the tetanic spasms and may delay definitive treatment. * **Option D (Observe and wait):** Tetany is a medical emergency. Untreated hypocalcemia can lead to laryngospasm, tetanic seizures, or prolonged QT interval leading to fatal arrhythmias. **3. NEET-PG High-Yield Pearls:** * **Chvostek sign:** Tapping the facial nerve leads to twitching of the facial muscles (indicative of hypocalcemia). * **Trousseau sign:** Carpopedal spasm induced by inflating a BP cuff above systolic pressure for 3 minutes (more specific than Chvostek). * **ECG Finding:** The classic sign of hypocalcemia is **prolonged QTc interval**. * **Administration Tip:** Always dilute calcium gluconate and ensure a patent IV line, as extravasation can cause severe tissue necrosis and sloughing. * **Refractory Hypocalcemia:** If calcium levels do not improve despite therapy, check **Magnesium levels**, as hypomagnesemia can cause resistance to PTH.

Q: A 3-year-old child ingested multiple tablets of metoprolol and presented with which of the following conditions?

Tachycardia. ### Explanation **Correct Option: C (Tachycardia)** While beta-blockers like metoprolol typically cause bradycardia in adults, **paradoxical tachycardia** is a recognized clinical feature in pediatric beta-blocker toxicity, especially in the early stages. This occurs due to a compensatory sympathetic surge triggered by initial hypotension or a reflex response to peripheral vasodilation. In children, the heart rate is the primary determinant of cardiac output; therefore, the body may attempt to compensate for decreased myocardial contractility by increasing the heart rate initially. **Analysis of Incorrect Options:** * **A & D (Widened QRS & Prolonged AV conduction):** These are classic features of **Propranolol** toxicity. Propranolol has "membrane-stabilizing activity" (sodium channel blockade), which leads to QRS widening and heart block. Metoprolol is a cardioselective beta-1 blocker and lacks significant membrane-stabilizing effects at standard toxic doses, making these findings less likely than in propranolol overdose. * **B (Feeble pulse):** While hypotension can occur, a "feeble pulse" is a non-specific sign of shock. In the context of this specific NEET-PG pattern question, the focus is on the paradoxical heart rate response unique to pediatric presentations. **Clinical Pearls for NEET-PG:** * **Antidote of Choice:** **Glucagon** is the first-line antidote for beta-blocker toxicity (it bypasses beta-receptors to increase cAMP). * **Propranolol vs. Metoprolol:** Propranolol is lipid-soluble, crosses the BBB (causing seizures), and causes QRS widening. Metoprolol is cardioselective and less likely to cause CNS or ECG conduction delays. * **Hypoglycemia:** Always monitor blood glucose in pediatric beta-blocker ingestion, as it inhibits glycogenolysis.

Q: What is the primary treatment for a dehydrated child?

5% dextrose. The primary goal in treating a dehydrated child is to restore intravascular volume and maintain blood glucose levels, as children have limited glycogen stores and are highly prone to hypoglycemia during stress. **Explanation of the Correct Answer:** **Option B (5% Dextrose)** is considered the standard component of maintenance fluids in pediatrics. While isotonic saline (0.9% NS) is used for initial bolus resuscitation in shock, the question refers to the general treatment of a dehydrated child. In pediatric practice, maintenance fluids must contain glucose (typically 5% Dextrose) to prevent catabolism, ketosis, and hypoglycemia. Modern guidelines often recommend **Isotonic Maintenance Fluids** (e.g., 0.9% NS + 5% Dextrose) to prevent hospital-acquired hyponatremia while providing necessary caloric support. **Analysis of Incorrect Options:** * **Option A (0.9% Normal Saline):** While used for "fluid resuscitation" (boluses) to correct hypovolemia, it lacks glucose. Using saline alone for maintenance can lead to hypoglycemia in pediatric patients. * **Option C & D (10% & 50% Dextrose):** These are hypertonic solutions. 10% Dextrose is typically reserved for neonates or specific hypoglycemic protocols, while 50% Dextrose is contraindicated in children due to the risk of rebound hypoglycemia and osmotic injury to veins; 25% is the maximum concentration usually used for pediatric boluses (diluted). **NEET-PG High-Yield Pearls:** * **Holiday-Segar Formula:** Used to calculate maintenance fluid requirements (100/50/20 rule). * **Fluid of Choice for Resuscitation:** 0.9% Normal Saline or Ringer’s Lactate (20 ml/kg bolus). * **Fluid of Choice for Maintenance:** Isotonic solutions (0.9% NS) with 5% Dextrose are now preferred over older hypotonic (0.18% or 0.45% NS) solutions to avoid hyponatremic encephalopathy. * **Deficit Calculation:** In children, mild dehydration is 10% weight loss.

Q: Criteria for diagnosing Systemic Inflammatory Response Syndrome (SIRS) include all of the following EXCEPT:

Persistent tachycardia over 0.5 hour in children 2 standard deviations (SD) above normal for age** in the absence of external stimuli (pain, drugs) OR a persistent elevation over a **0.5-to-4-hour period**. However, the specific age-related threshold for tachycardia in infants ( 180 bpm**. The option is technically incorrect because the definition of SIRS relies on SD-based thresholds or specific bpm cut-offs rather than just the duration alone without the quantitative value. Furthermore, bradycardia (HR 38.5°C or 2 SD above normal for age or the need for mechanical ventilation for an acute process is a valid criterion. * **Option D (Leukocyte Count):** Elevated or depressed leukocyte count for age (not secondary to chemotherapy) or **>10% immature neutrophils (bands)** is a valid criterion. ### NEET-PG High-Yield Pearls * **Mandatory Rule:** Unlike adults, pediatric SIRS **must** include either abnormal temperature or abnormal WBC count. * **Sepsis Definition:** SIRS + suspected or proven infection. * **Severe Sepsis:** Sepsis + cardiovascular dysfunction OR ARDS OR ≥2 organ dysfunctions. * **Septic Shock:** Sepsis with cardiovascular dysfunction that persists despite ≥40 mL/kg of fluid resuscitation.

Q: A five-year-old boy develops sudden aphonia and respiratory distress while having dinner. Which of the following is the next recommended step in the management of this patient?

Heimlich maneuver. ### Explanation **Correct Option: A. Heimlich maneuver** The clinical presentation of sudden aphonia (inability to speak) and respiratory distress while eating is a classic sign of **complete foreign body airway obstruction (FBAO)**. In a conscious child older than one year, the **Heimlich maneuver (subdiaphragmatic abdominal thrusts)** is the gold-standard emergency intervention. It works by increasing intrathoracic pressure to create an "artificial cough," which forcefully expels the foreign body from the larynx or trachea. **Why other options are incorrect:** * **B. Chest thrust maneuver:** This is the recommended technique for infants (**<1 year old**) instead of abdominal thrusts, as the latter can cause significant liver or splenic injury in infants due to their anatomy. * **C. Finger sweep maneuver:** This is strictly contraindicated in blind scenarios. Attempting a blind finger sweep can push the foreign body deeper into the airway, converting a partial obstruction into a complete one. It should only be performed if the object is clearly visible and easily reachable. * **D. Cricothyroidotomy or tracheostomy:** These are invasive surgical airways. While they may be necessary if non-invasive maneuvers fail and the patient becomes unconscious, they are never the *initial* step for a conscious patient with FBAO. **High-Yield Clinical Pearls for NEET-PG:** * **Age Cut-off:** Use **Back blows and Chest thrusts** for infants ( 1 year) and adults. * **The "Universal Sign":** Clutching the throat with hands is the classic sign of choking. * **Sequence Change:** If the patient becomes **unconscious**, immediately transition to **CPR** (starting with chest compressions), regardless of whether a pulse is present. * **Definitive Diagnosis:** For stable patients with suspected foreign body aspiration, **Rigid Bronchoscopy** is both the diagnostic and therapeutic gold standard.

Q: In a child weighing 15 kg, what is the approximate daily fluid maintenance requirement?

1250 mL. The calculation of daily maintenance fluid in pediatrics is based on the **Holliday-Segar Formula**, which estimates caloric expenditure and corresponding water needs based on body weight. ### **The Holliday-Segar Rule (100/50/20 Rule):** * **First 10 kg:** 100 mL/kg/day * **Next 10 kg (11–20 kg):** 50 mL/kg/day * **Each kg above 20 kg:** 20 mL/kg/day **Calculation for a 15 kg child:** 1. First 10 kg: $10 \times 100 \text{ mL} = 1000 \text{ mL}$ 2. Remaining 5 kg: $5 \times 50 \text{ mL} = 250 \text{ mL}$ 3. **Total:** $1000 + 250 = \mathbf{1250 \text{ mL/day}}$ ### **Analysis of Options:** * **A (100 mL):** This is the rate per kg for only the first 10 kg, not the total volume. * **C (1500 mL):** This would be the requirement for a 20 kg child ($1000 + 500$). * **D (1750 mL):** This would be the requirement for a child weighing approximately 32.5 kg. ### **High-Yield Clinical Pearls for NEET-PG:** * **Hourly Rate (4/2/1 Rule):** For quick calculations, use 4 mL/kg/hr for the first 10 kg, 2 mL/kg/hr for the next 10 kg, and 1 mL/kg/hr thereafter. For this child: $(10 \times 4) + (5 \times 2) = 50 \text{ mL/hr}$. * **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 requirements increase with fever (12% for every 1°C rise) and decrease in conditions like SIADH, oliguric renal failure, or congestive heart failure.

Q: Which type of dehydration is considered the most dangerous?

Hypernatremic dehydration. **Explanation:** **Hypernatremic dehydration (Serum Na+ >150 mEq/L)** is considered the most dangerous form of dehydration due to its profound impact on the central nervous system. **Why it is the most dangerous:** In hypernatremic states, the high extracellular osmolality causes water to move out of the brain cells into the extracellular space (osmotic shift). This leads to **cerebral shrinkage**, which can tear delicate bridging veins, resulting in **intracranial hemorrhage**, subdural hematomas, and permanent neurological damage or seizures. Furthermore, the clinical signs of dehydration (like skin turgor) are often masked because water is pulled from the cells into the vascular space, maintaining blood pressure until late stages. This often leads to a dangerous delay in diagnosis. **Analysis of Incorrect Options:** * **A. Hyponatremic dehydration (Na+ <130 mEq/L):** While it carries a risk of cerebral edema during rapid correction, the initial compensatory mechanisms are generally less catastrophic than the vascular tearing seen in hypernatremia. * **C. Isonatremic dehydration (Na+ 130–150 mEq/L):** This is the most common type (approx. 80% of cases). Electrolyte balance is maintained, making it the safest and easiest to manage. * **D. Non-diarrheal causes:** The etiology (e.g., vomiting or decreased intake) is less critical than the resulting serum tonicity in determining immediate mortality risk. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Sign:** "Doughy" or velvety skin texture is characteristic of hypernatremic dehydration. * **Management Rule:** Never correct hypernatremia faster than **0.5 mEq/L/hour** (or 10–12 mEq/L per 24 hours) to prevent **Cerebral Edema**. * **Most common type:** Isonatremic dehydration. * **Most common cause of Hypernatremic dehydration:** High solute intake (improperly mixed formula) or viral diarrhea with high insensible water loss.

Question 1

What is the immediate treatment for a 10 kg infant presenting with tetany?

Accepted Answer

Intravenous calcium gluconate with cardiac monitoring

Answer

Intravenous Diazepam

Answer

Intravenous slow phenobarbital

Answer

Observe and wait

Question 2

A 3-year-old child ingested multiple tablets of metoprolol and presented with which of the following conditions?

Accepted Answer

Tachycardia

Answer

Widened QRS complexes

Answer

Feeble pulse

Answer

Prolonged AV conduction times

Question 3

A 2-year-old boy presents with fever for 3 days which responded to paracetamol. Three days later, he developed acute renal failure, marked acidosis, and encephalopathy. His urine showed plenty of oxalate crystals. The blood anion gap and osmolal gap were increased. Which of the following is the most likely diagnosis?

Accepted Answer

Diethylene glycol poisoning

Answer

Paracetamol poisoning

Answer

Severe malaria

Answer

Hantavirus infection

Question 4

A child presents with seizures, and on examination, has a respiratory rate of 5 per minute, a pulse of 54 per minute, and cyanosis. What is the immediate next step in management?

Accepted Answer

Intubation followed by ventilation with oxygen and chest compressions.

Answer

Administer diazepam for seizures, followed by adrenaline and chest compressions.

Answer

Administer oxygen, chest compressions, and adrenaline; insert a laryngeal mask airway (LMA).

Answer

Administer intravenous midazolam stat, followed by insertion of a laryngeal mask airway (LMA).

Question 5

What is the primary treatment for a dehydrated child?

Accepted Answer

5% dextrose

Answer

0.9% normal saline

Answer

10% dextrose

Answer

50% dextrose

Question 6

You are the physician on call for the extracorporeal membrane oxygenation (ECMO) service. There are 5 calls today, but only one machine and one technologist available. Which of the following patients is the most appropriate recipient of this service?

Accepted Answer

A 3-day-old boy preoperative for a congenital diaphragmatic hernia

Answer

A 1-day-old, full-term, anencephalic 4-kg boy suffering from meconium aspiration syndrome and hypoxia

Answer

A 75-year-old man with Alzheimer disease, severe pneumonia, and elevated pulmonary arterial pressure

Answer

A 5-year-old girl with rhabdomyosarcoma metastatic to the lungs

Question 7

Criteria for diagnosing Systemic Inflammatory Response Syndrome (SIRS) include all of the following EXCEPT:

Accepted Answer

Persistent tachycardia over 0.5 hour in children < 1 year old

Answer

Temperature > 38.5°C or < 36°C

Answer

Respiratory rate > 2 standard deviations above normal for age

Answer

> 10% immature neutrophils

Question 8

A five-year-old boy develops sudden aphonia and respiratory distress while having dinner. Which of the following is the next recommended step in the management of this patient?

Accepted Answer

Heimlich maneuver

Answer

Chest thrust maneuver

Answer

Finger sweep maneuver

Answer

Cricothyroidotomy or tracheostomy

Question 9

In a child weighing 15 kg, what is the approximate daily fluid maintenance requirement?

Accepted Answer

1250 mL

Answer

100 mL

Answer

1500 mL

Answer

1750 mL

Question 10

Which type of dehydration is considered the most dangerous?

Accepted Answer

Hypernatremic dehydration

Answer

Hyponatremic dehydration

Answer

Isonatremic dehydration

Answer

Dehydration from a non-diarrheal cause

Pediatric Critical Care — MCQs

Pediatric Critical Care — MCQs

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