High Yield ECG

Question 1

Critical Causes of Right Axis Deviation (3)

Answer 1

• Pulmonary Embolism
• Hyperkalemia
• Sodium channel blocker toxicity (TCA)

Question 2

Features of AF with Pre-excitation

Answer 2

• irregularly irregular WCT
• Polymorphic
• Highly variable rate (up to 300bpm)

Question 3

DDx for irregular NCT (3)

Answer 3

• AF with RVR
• AFlutter with variable conduction
• Multifocal Atrial Tachycardia (M.A.T.)

Question 4

How common are dynamic ST changes in prehospital-identified STEMI? How often do they evolve? How often do they resolve?

Answer 4

Very common!
~20% of prehospital STEMI shows STE resolution on ED arrival.
~10% of cases which flag for STEMI in ED were originally NSTEMI