• understand the Vaughan Williams classification of anti-dysrhythmic drugs
• 2. recognise that some drugs are unclassified on this scheme
• 3. know the mechanism of action, and uses of the Class I group of drugs
• 4. recognise the term ""use-dependent"" block
• 5. understand the mechanism of action, and uses of the Class II group of drugs
• 6. know the mechanism of action, and uses of the Class III group of drugs
• 7. understand the mechanism of action, and uses of the Class IV group of drugs
• 8. know the mechanisms of action, and uses of the unclassified drugs

ectopic pacemaker activity (each cell can generate its own rhythm this is when a part of the heart sets its own rythm independant of the SA node it could be due to a conduction block)

delayed after-depolarisations (random depolarisation of cells when it should not be occuring, the action potential fires due to Ca2+ elevation)