Emergency Medicine confusion pairs
7 Emergency Medicine topics students commonly mix up on Step 2 CK, each with the fastest separator, a side-by-side comparison, and a free practice question.
Step 2 CK pairs are in open beta while clinical review finishes. Spot an issue? Tell us.
- Acute respiratory failure type 1 vs Acute respiratory failure type 2PaCO2 above 50 mm Hg on ABG is the fastest branch point toward type 2 respiratory failure.
- Cardiac arrest VF/VT vs Cardiac arrest PEA/asystoleShockable monitor rhythm defines VF or pulseless VT, while PEA or asystole are nonshockable.
- Anaphylaxis vs AngioedemaUrticaria with bronchospasm or hypotension indicates anaphylaxis and immediate epinephrine need.
- Anaphylaxis vs Vasovagal syncopeHypotension with concurrent urticaria, airway edema, or wheeze after exposure identifies anaphylaxis.
- Methanol overdose vs Ethylene glycol overdoseVisual complaints versus oxalate-associated kidney injury is the key bedside discriminator.
- Acetaminophen overdose vs Salicylate overdoseMixed respiratory alkalosis plus anion-gap metabolic acidosis is the rapid discriminator for salicylate toxicity.
- Opioid overdose vs Benzodiazepine overdosePinpoint pupils with respiratory rate below 8 per minute is the immediate branch point toward opioid overdose.