Term
| Fast Action Potential dependent on ? |
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Definition
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Term
| Slow AP dependent on what |
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Definition
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Term
| Examples of Supraventricular Arrhythmias |
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Definition
-Sinus Bradycardia (<60bpm)
-Sinus Tachycardia (>100)
-Atrial Flutter (>300, stable reentry)
-Atrial Fibrillation (>400, disorganized reentry)
-PSVT (reentry w/in AV node, Ca2+ channel blockers) |
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Term
| Examples of Ventricular Arrhythmias |
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Definition
-Premature ventricular contractions (dangerous in pts w/ cardiac disease)
-Ventricular Tachycardia
-Ventricular Fibrillation (cardioversion, shock)
-Toursades de Pointe |
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Term
| When does a Early after depolarization occur |
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Definition
duration of AP is elongated,
can be drug induced |
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Term
| When does Late after depolarization DAD occur |
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Definition
| Overload of excess calcium |
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Term
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Definition
-Anticholinergics - Atropine
-B-agonist- Isoproterenol
-Pacemaker |
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Term
| How Tx Tachycardia pharmacologically if automaticity induced |
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Definition
| Dec. Phase 4 automaticity so class I-IV |
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Term
| Tx Tachycardia pharmacologically if Reentry induced |
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Definition
*Interrupt circuit by slowing conduction
-Fast AP - Na channel blockers
-Slow AP - Calcium channel blockers or Beta-blockers
*Or increase Refractory period
-K channel blockers |
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Term
| How tx tachycardia if drugs ineffective |
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Definition
| Cardioversion and ablation |
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Term
| Example of Na Channel block |
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Definition
Procainamide
Lidocaine (minimal)
Flecainide (strong) |
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