Cardiac Arrhythmias

Question 1

What are the 5 phases of the action potential?

Answer 1

Phase 0: The rapid upstroke, corresponds to the QRS deflection

Phase 1-2: Early repolarization & plateau, Accounts for the ST segment

Phase 3: Late repolarization, Accounts for the T wave

Phase 4: Diastole, Corresponds to the segment between the end of the T wave and the subsequent QRS deflection

Question 2

Classify Arrhythmias

Answer 2

Rate- Tachycardia, Bradycardia

Mechanism- Automaticity, Re-entry, Triggered

Site of origin

Duration- Isolated, couplets, non-sustained & sustained