Master Acute Care
for MCCQE Part 1

What the MCCQE Part 1 Tests in Acute Care

The MCCQE Part 1 Acute Care section tests your ability to recognise and manage life-threatening presentations across all age groups, with emphasis on initial stabilisation, differential diagnosis, and appropriate disposition. You must demonstrate knowledge of resuscitation algorithms (e.g., ACLS, ATLS), sepsis criteria (qSOFA, SIRS), airway management (RSI drugs: ketamine, rocuronium), and acute coronary syndrome (ECG criteria, high-sensitivity troponin). Common scenarios include anaphylaxis, status epilepticus, major trauma, diabetic ketoacidosis, and acute asthma. The exam expects you to apply Canadian guidelines (e.g., CT head rules for minor head injury, Ottawa ankle rules) and choose between conservative management, pharmacotherapy, or immediate surgical consultation. Questions often present as clinical vignettes requiring prioritisation of next steps—ABCDE approach is key.

High-Yield Concepts

• Sepsis and Septic Shock: Use qSOFA (≥2 of: RR≥22, SBP≤100, altered mentation) for rapid identification. Initiate 30mL/kg crystalloid bolus within 3 hours, obtain blood cultures before antibiotics, and give broad-spectrum antibiotics (e.g., piperacillin-tazobactam) within 1 hour. For septic shock with lactate >2 mmol/L or hypotension after fluids, start norepinephrine as first-line vasopressor.
• Acute Coronary Syndrome (ACS): Identify STEMI by new ST-elevation at J-point in ≥2 contiguous leads (≥1mm in limb leads, ≥2mm in precordial). High-sensitivity troponin I >99th percentile (often >26 ng/L) with rise/fall is diagnostic. Immediate management: aspirin 162-325 mg, nitroglycerin if SBP >90, heparin (unfractionated or LMWH), and primary PCI within 90 minutes for STEMI.
• Status Epilepticus: Defined as ≥5 minutes of continuous seizure or ≥2 seizures without recovery. First-line: IV lorazepam 0.1 mg/kg (max 4 mg) or IM midazolam 10 mg. If persists after 10 minutes, give IV fosphenytoin 20 mg/kg PE or IV valproate 40 mg/kg. Refractory: IV propofol or midazolam infusion with EEG monitoring.
• Anaphylaxis: Diagnose by acute onset of urticaria/angioedema plus respiratory compromise or hypotension. First-line: IM epinephrine 0.3-0.5 mg (1:1000) anterolateral thigh, repeat every 5-15 minutes. Adjuncts: IV fluids (20 mL/kg bolus), antihistamines (diphenhydramine 25-50 mg IV), and corticosteroids (methylprednisolone 125 mg IV).
• Diabetic Ketoacidosis (DKA): Diagnostic criteria: glucose >13.9 mmol/L, pH <7.3, bicarbonate <15 mmol/L, anion gap >12, ketonemia/ketonuria. Management: IV fluids (0.9% saline, 15-20 mL/kg first hour), IV insulin infusion (0.1 units/kg bolus then 0.1 units/kg/hr), replace potassium when <5.5 mmol/L, monitor glucose and anion gap hourly.
• Major Trauma and ATLS: Primary survey: ABCDE (airway with C-spine protection, breathing with bilateral breath sounds, circulation with pelvic binder if unstable, disability with GCS, exposure). Indications for chest decompression: tension pneumothorax (needle decompression 2nd intercostal space, midclavicular line) or massive haemothorax (chest tube 5th intercostal space, anterior axillary line).
• Acute Asthma Exacerbation: Severe: PEFR <50% predicted, RR >30, inability to complete sentences, SpO2 <92%. Treatment: high-flow oxygen, salbutamol 2.5-5 mg via nebuliser every 20 minutes, ipratropium 0.5 mg added initially, IV magnesium sulfate 2 g over 20 minutes if not responding. Oral prednisone 50 mg daily for 5-7 days (or IV hydrocortisone 200 mg).
• Acute Upper GI Bleed: Stratify with Glasgow-Blatchford score (e.g., BUN >6.4 mmol/L, Hb <130 g/L, SBP <100, melena). For haemodynamic instability: IV access ×2, crystalloid bolus, crossmatch for PRBCs. Consider urgent endoscopy within 12-24 hours; pre-endoscopy IV proton pump inhibitor (pantoprazole 80 mg bolus then 8 mg/hr) is not recommended routinely but used if high-risk stigmata.

Common Traps in Acute Care Questions

• Confusing qSOFA with SIRS criteria—qSOFA is for rapid identification in non-ICU settings, not for diagnosis.
• Giving IV epinephrine for anaphylaxis before IM—IV is reserved for refractory shock due to risk of arrhythmia.
• Assuming normal vital signs rule out sepsis in the elderly—they may present with altered mental status and normothermia.
• Starting insulin before correcting potassium in DKA—severe hypokalemia can cause cardiac arrest.
• Using naloxone for respiratory depression in opioid overdose but forgetting to check for concurrent aspirin or TCA ingestion.
• Forgetting to reassess airway after RSI—failure to confirm ET tube placement with capnography is a common error.

How to Revise Acute Care for the MCCQE Part 1

For Acute Care on MCCQE Part 1, prioritise mastering the ABCDE approach and time-sensitive decision algorithms. Questions often present as unfolding scenarios where you must choose the next best step—not the final diagnosis. Practice interpreting ECGs for STEMI mimics (e.g., pericarditis, LVH with strain), and know when to order CT head vs. CT cervical spine in trauma. Focus on Canadian-specific guidelines: use the Ottawa ankle rules for imaging, and remember that for mild traumatic brain injury with GCS 15, CT is indicated only if any one of the Canadian CT Head Rule criteria is met. Also, be comfortable with paediatric adjustments (e.g., weight-based fluid and drug dosing). Spend time on high-yield tables comparing anaphylaxis vs. vasovagal reaction, and DKA vs. HHS. The exam rewards systematic thinking over memorisation of rare conditions.

Practise it: MedLumen has 50 Acute Care questions for the MCCQE Part 1, each with a full explanation and references.