Last reviewed: May 2026 | Written by the MplusX Editorial Team
📌 Key Takeaways
- Primary Reference: Paediatric emergency questions on the AMC MCQ are graded strictly against the Royal Children’s Hospital (RCH) Melbourne clinical practice guidelines.
- Anaphylaxis First-Line: Intramuscular (IM) adrenaline 10 mcg/kg (0.01 mg/kg or 0.01 mL/kg of 1:1,000 solution) injected into the anterolateral thigh is the first-line treatment for pediatric anaphylaxis.
- Seizure Escalation: Status epilepticus management requires a strict timeline. Administer benzodiazepines (buccal midazolam or IV diazepam/midazolam) at the 5-minute mark, and escalate to second-line anticonvulsants (levetiracetam or phenytoin) if seizures persist past 15 minutes.
- Primary CTA: Download the Paediatric Emergency Cheat Sheet — a laminated reference PDF detailing RCH emergency pathways, drug doses, and age-based normal vital signs.
A parent runs into your clinic screaming.
In her arms is a limp 18-month-old child, cyanotic and actively convulsing.
What is your immediate next step?
Under exam pressure, managing a pediatric emergency can feel overwhelming. A single incorrect drug dose or a delayed airway decision can lead to an immediate fail.
In Australia, these critical scenarios are graded strictly against the Royal Children’s Hospital (RCH) Melbourne clinical practice guidelines.
This guide breaks down the exact high-yield resuscitation algorithms, vital signs, and drug doses you must know to pass the AMC MCQ.
1. Age-Based Paediatric Vital Signs Reference
To diagnose pediatric shock, respiratory failure, or systemic inflammatory response syndrome (SIRS), you must understand what constitutes “normal” for different age brackets. A heart rate of 145 bpm is normal for a newborn but represents severe tachycardic distress for a 10-year-old child.
Memorize these age-based physiological thresholds defined by the RCH:
| Age Group | Heart Rate (bpm, awake) | Respiratory Rate (breaths/min) | Normal Systolic Blood Pressure (mmHg) | Hypotension Threshold (mmHg) |
|---|---|---|---|---|
| Neonate (<28 days) | 110–160 | 30–60 | 60–80 | <60 |
| Infant (1–12 months) | 110–160 | 30–45 | 70–90 | <70 |
| Toddler (1–2 years) | 100–150 | 25–35 | 80–95 | <70 + (2 × age in years) |
| Preschooler (3–5 years) | 90–140 | 22–30 | 80–100 | <70 + (2 × age in years) |
| School-Aged (6–11 years) | 80–120 | 18–25 | 90–110 | <70 + (2 × age in years) |
| Adolescent (12–15 years) | 60–100 | 12–20 | 100–120 | <90 |
Clinical Rule: In pediatric resuscitation, hypotension is a late and pre-terminal sign of shock. Children maintain their blood pressure through intense vasoconstriction and tachycardia until they decompensate rapidly. If a child presents with cold extremities, delayed capillary refill (>2 seconds), and tachycardia, do not wait for hypotension to diagnose shock; initiate aggressive fluid resuscitation immediately.
2. Paediatric Anaphylaxis: Dosing and Administration
Anaphylaxis is a multi-system, life-threatening allergic reaction. On the AMC MCQ, this is frequently tested with scenarios involving food allergies (peanuts, eggs) or insect stings (wasps, bees) in a school or daycare setting.
The First-Line Treatment: Adrenaline
* Dose: 10 mcg/kg (0.01 mg/kg) of 1:1,000 adrenaline solution. Route: Intramuscular (IM) injection. Never administer IV adrenaline in a ward or community setting; IV adrenaline is reserved for monitored ICU/ED resuscitation and requires a 1:10,000 dilution.* * Location: Anterolateral thigh (vastus lateralis muscle). Injection into the buttock or deltoid is incorrect due to slower absorption rates.If you are using an autoinjector (EpiPen) in a community setting: * Child weight 7.5 to 20 kg: EpiPen Junior (150 mcg adrenaline). * Child weight >20 kg: EpiPen (300 mcg adrenaline).
[Suspected Pediatric Anaphylaxis]
│
(Assess: Airway, Breathing, Circulation)
▼
[Inject IM Adrenaline 10 mcg/kg (1:1000)]
(Into anterolateral thigh)
│
(High-flow Oxygen + IV Access)
▼
[Assess Response after 5 Minutes]
│
┌─────────────────────────┴────────────────────────┐
▼ (Improving) ▼ (Not Improving)
[Observe for minimum 4 hours] [Repeat IM Adrenaline dose]
(Assess for biphasic reaction) [Consider IV fluid bolus 20 mL/kg]
Supportive Management
* Fluid Resuscitation: If the patient remains hypotensive or shocked despite IM adrenaline, administer an immediate IV bolus of 20 mL/kg of 0.9% sodium chloride (normal saline). * Positioning: Lay the child flat with legs elevated. Do not allow them to stand or sit up abruptly, as this can precipitate sudden orthostatic collapse. * Observation Period: All patients presenting with anaphylaxis must be observed in a hospital setting for a minimum of 4 to 6 hours after their last dose of adrenaline, due to the risk of a secondary, delayed biphasic reaction.3. Paediatric Status Epilepticus: The Escalation Pathway
Status epilepticus is defined as a continuous seizure lasting more than 5 minutes, or recurrent seizures without recovery of consciousness between episodes. The AMC MCQ tests your knowledge of the exact time intervals and drug choices.
Use this step-wise escalation timetable to manage status epilepticus:
| Time Elapsed | Clinical State | First-Line Action | Alternative / Detail |
|---|---|---|---|
| 0 to 5 minutes | Active seizure | – Airway protection (high-flow O2). – Check blood glucose immediately (rule out hypoglycemia). | Do not attempt IV access if it agitates the child or delays care. |
| 5 minutes | Seizure continues | First Benzodiazepine Dose: – Buccal Midazolam 0.3 mg/kg OR – IV Diazepam 0.2 mg/kg | If IV access is already established, IV Diazepam or IV Midazolam is preferred. |
| 10 minutes | Seizure continues | Second Benzodiazepine Dose: – Repeat Midazolam or Diazepam dose once. | Do not administer more than two doses of benzodiazepines due to severe respiratory depression risk. |
| 15 minutes | Seizure continues | Second-Line Anticonvulsants: – IV Levetiracetam 40 mg/kg (infused over 5 mins) OR – IV Phenytoin 20 mg/kg (infused over 20 mins) | Prepare airway support equipment. Monitor for cardiac arrhythmias during phenytoin infusion. |
| 25 to 30 minutes | Seizure continues | Third-Line (RSI & ICU): – Contact ICU / Anaesthetics. – Perform Rapid Sequence Induction (RSI) using thiopentone or propofol. | Prepare for invasive mechanical ventilation. |
Key Exam Pearl: If the glucose check reveals hypoglycemia (glucose <3.0 mmol/L), the immediate treatment is 5 mL/kg of 10% dextrose (D10W) as an IV bolus. Do not administer 50% dextrose (D50W) to children, as it is highly hypertonic and causes severe venous sclerosis and tissue necrosis if extravasated.
4. Severe Croup: Diagnostic Criteria and Management
Croup (laryngotracheobronchitis) is characterized by a barking cough, hoarseness, and inspiratory stridor. On the AMC MCQ, the clinical priority is determining the severity of the obstruction and avoiding any actions that could worsen airway spasm.
Severity Assessment Matrix (RCH Guidelines)
* Mild Croup: Barking cough, occasional stridor only when active/agitated. No chest wall retractions. The child is playful and interactive. Management:* A single dose of oral dexamethasone 0.15 mg/kg (or prednisolone 1 mg/kg). The child can be safely discharged home with parent education. * Moderate Croup: Frequent barking cough, inspiratory stridor at rest, mild chest wall retractions (subcostal/intercostal). The child is still interactive but distressed. Management:* Administer oral dexamethasone 0.15 to 0.3 mg/kg. Observe in the emergency department for a minimum of 3 to 4 hours. If stridor at rest resolves, they may be discharged. * Severe Croup: Persistent inspiratory stridor at rest, marked chest wall retractions (sternal recess, accessory muscle use), agitation, or lethargy. Management:* Medical emergency. Administer nebulised adrenaline 5 mL (1:1,000 solution) neat immediately, alongside dexamethasone 0.6 mg/kg (IV, IM, or oral). Arrange urgent pediatric senior review.Critical Exam Warning: Do Not Agitate the Child
If a child presents with severe croup, do not attempt to examine the throat with a tongue depressor, and do not attempt to obtain painful IV access or bloods immediately.Agitating the child increases their sympathetic drive, accelerating their respiratory rate and triggering a catastrophic complete airway obstruction. Keep the child in their parent’s arms, administer nebulised adrenaline via a mask held close to the face, and maintain a quiet, calm environment.
Differential Diagnosis: Croup vs. Epiglottitis vs. Bacterial Tracheitis
On the AMC MCQ, you must be able to rapidly differentiate croup from other serious upper airway obstructions. Misdiagnosing bacterial tracheitis or epiglottitis can lead to incorrect airway management choices.Study this high-yield clinical differentiation matrix:
| Feature | Croup (Laryngotracheobronchitis) | Acute Epiglottitis | Bacterial Tracheitis |
|---|---|---|---|
| Onset | Gradual (over 1 to 2 days) | Rapid (over hours) | Intermediate (starts as croup, deteriorates) |
| Fever | Low-grade (<38.5°C) | High-grade (>39.0°C) | High-grade (>39.0°C) |
| Cough | Barking (“seal-like”) cough | Absent or minimal | Severe, harsh cough with thick secretions |
| Stridor | Fluctuating, inspiratory | Quiet, soft, inspiratory | Harsh, inspiratory and expiratory |
| Drooling & Dysphagia | Absent | Present and severe | Absent, but may have difficulty swallowing secretions |
| Preferred Posture | Any position | Tripod (sitting up, leaning forward, chin out) | Preferred flat or semi-recumbent |
| Toxic Appearance | No (unless severe decompensation) | Yes (pale, anxious, toxic-looking) | Yes (toxic, septic, severely ill) |
| Primary Pathogen | Viral (Parainfluenza type 1 and 2) | Bacterial (Haemophilus influenzae type b – Hib) | Bacterial (Staphylococcus aureus, S. pneumoniae) |
| First-line Treatment | Corticosteroids (Dexamethasone) + Nebulised Adrenaline | Airway stabilization in theatre + IV Ceftriaxone | Urgent intubation/suction + IV Ceftriaxone + Flucloxacillin |
Immediate Clinical Action Rules: * Epiglottitis: If epiglottitis is suspected, do not attempt any diagnostic interventions (no throat exam, no cannulation, no X-rays). Call the pediatric airway team, anesthesiologist, and ENT specialist immediately. The child must be transferred calmly to the operating theatre for controlled inhalation induction and intubation. * Bacterial Tracheitis: Unlike croup, bacterial tracheitis does not respond to nebulised adrenaline or steroids. The hallmark is the production of copious, thick, purulent secretions. Immediate management requires securing the airway via intubation, aggressive tracheal suctioning in a controlled setting, and IV broad-spectrum antibiotics.
5. Febrile Convulsions: Parent Education & Safety-Netting
Febrile convulsions are seizures occurring in children aged 6 months to 6 years, associated with a rapid rise in temperature, without evidence of intracranial infection or defined cause.
While benign, they are terrifying for parents. The AMC MCQ heavily tests your communication and safety-netting skills for this presentation.
Immediate Management in the Clinic
1. Stop the Seizure: Most febrile convulsions last less than 5 minutes and resolve spontaneously. If the child is actively convulsing in your clinic and it has lasted >5 minutes, follow the status epilepticus pathway (administer buccal midazolam). 2. Identify the Source of Fever: Perform a thorough examination to exclude serious bacterial infections (meningitis, pneumonia, UTI). If meningitis is clinically suspected (neck stiffness, bulging fontanelle, petechial rash, non-blanching spots), perform a lumbar puncture (unless contraindicated) and initiate IV antibiotics. 3. Do Not Aggressively Cool the Child: Cold baths, tepid sponging, and stripping the child naked are counterproductive. They cause vasoconstriction and shivering, which actually increases the core body temperature. 4. Role of Antipyretics: Paracetamol and ibuprofen do not prevent febrile convulsions. They are used solely to improve the child’s comfort by reducing the systemic distress of fever. Do not advise parents to alternate antipyretics to prevent future seizures.Parent Safety-Netting Checklist
When counseling parents prior to discharge: Reading about MplusX vs AMEDEX might also be helpful. * Explain that febrile convulsions do not cause brain damage, intellectual disability, or increase the risk of epilepsy (the risk remains close to the general population baseline of 1–2%). * Provide first-aid education: If a seizure occurs at home, lay the child on their side (recovery position), clear the area of sharp objects, and note the time. * Instruct the parents to call 000 for an ambulance if the seizure lasts more than 5 minutes, or if the child does not wake up after the convulsion ceases.Frequently Asked Questions
What is the first-line antibiotic for pediatric meningitis?
In Australia, for a child presenting with suspected bacterial meningitis, the first-line empiric antibiotic choice is IV Ceftriaxone 50 mg/kg (up to 2g) 12-hourly. If the child is aged under 3 months, you must add IV Ampicillin or Amoxicillin 50 mg/kg 6-hourly to cover Listeria monocytogenes.How do we calculate the fluid resuscitation volume in pediatric shock?
The standard fluid resuscitation bolus for pediatric hypovolemic or septic shock is 20 mL/kg of 0.9% sodium chloride (normal saline) administered rapidly over 10 to 20 minutes. Assess the clinical response (heart rate, capillary refill, conscious state) after the bolus. If signs of shock persist, you may repeat the bolus up to a total of 40–60 mL/kg, checking for signs of fluid overload (hepatomegaly, crackles) before each repeat.What is the correct management of a pediatric choking emergency?
For an infant (<1 year) with severe airway obstruction (ineffective cough): administer 5 back blows, followed by 5 chest thrusts. Do not perform abdominal thrusts (Heimlich maneuver) in infants due to risk of splenic or hepatic rupture. For a child (>1 year), alternate 5 back blows with 5 abdominal thrusts. If the child becomes unresponsive, initiate CPR immediately.When should we perform a lumbar puncture in a child with a febrile seizure?
A lumbar puncture is indicated if there are clinical signs of meningitis (bulging fontanelle, neck stiffness, Kernig’s or Brudzinski’s signs, persistent lethargy, or irritability). It should also be strongly considered in infants aged 6 to 12 months if their immunization status for Haemophilus influenzae type b (Hib) and Streptococcus pneumoniae is incomplete or unknown, as clinical signs of meningitis are subtle in this age bracket.What is the difference between croup and acute epiglottitis?
Croup is a viral infection characterized by a barking cough, hoarseness, and fluctuating stridor. Acute epiglottitis is a rapidly progressive bacterial infection (traditionally Hib) characterized by high fever, severe sore throat, drooling, dysphagia, and a prefered tripod sitting position. Epiglottitis has no barking cough. If epiglottitis is suspected, do not examine the throat; transfer the child immediately to the operating theatre for urgent intubation. See also: MplusX QBank review.How do we manage mild paediatric asthma exacerbations under RCH guidelines?
For a child presenting with a mild asthma flare (mild chest wall retraction, normal oxygen saturation): administer salbutamol via a spacer. The dose is 6 puffs for children under 6 years, and 12 puffs for children 6 years and older. Review the response after 20 minutes. If stable, discharge with a 3-day course of oral prednisolone (1mg/kg up to 50mg daily). See also: complete AMC MCQ exam guide.Written by the MplusX Editorial Team — dedicated to providing clinically accurate, structured, and practical resources for international medical graduates pursuing licensing with the Australian Medical Council.
References
- John Murtagh‘s General Practice (8th Edition): Chapter 83: An approach to the child, Page 2230; Chapter 84: Specific problems of children, Page 2252; Chapter 89: Emergencies in children, Page 2396
- RACGP Red Book (10th edition): Chapter 3: Preventive activities in children and young people, Page 32
- Therapeutic Guidelines (eTG): Respiratory: Chapter 12: Croup; Part 2 Neurology: Chapter 1: Acute management of seizures and status epilepticus
- Royal Children’s Hospital (RCH) Melbourne Guidelines: Clinical Practice Guidelines (Croup, Anaphylaxis, Status Epilepticus, Febrile Convulsion)
Disclaimer: This article is written for AMC MCQ examination preparation and general informational purposes only. It does not constitute medical advice, diagnosis, or treatment recommendations. Clinical decisions should always be based on individual patient assessment, current Australian Therapeutic Guidelines (eTG), and consultation with qualified healthcare professionals. MplusX is an exam preparation platform and is not a substitute for supervised clinical training.