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Anti-arrythmic drugs
Class I Antiarrhythmics (Na+ Channel Blockers) Overview
Indications
Arrhythmias
Local Anesthesia
Mechanism of Action
Block or Slow Conduction
Block Na+ Channels
Raise Threshold
State Dependent
Contraindication
Hyperkalemia
1 min
Class IB Antiarrhythmics (Na+ Channel Blockers)
Indications
Arrhythmias
After Myocardial Infarction
Mechanism of Action
Affect Ischemic Tissue
Decrease AP duration
Drugs
Mexiletine
GI Upset
Lidocaine
CNS Depression
Tocainide
Phenytoin
Hirsutism
2 mins
Class IA Antiarrhythmics (Na+ Channel Blockers)
Indications
Arrhythmias
Mechanism of Action
Increase AP, ERP, and QT interval.
Drugs
Disopyramide
Procainamide
Drug-induced Lupus
Quinidine
Cinchonism
Shared Side Effects
Thrombocytopenia
Torsades de Pointes
1 min
Class IC Antiarrhythmics (Na+ Channel Blockers)
Indications
Used as Last Resort
V-Tach
Mechanism of Action
No Effect on AP Duration
Drugs
Propafenone
Flecainide
Contraindications
Post-Myocardial Infarction
56 secs
Class III Antiarrhythmics (K+ Channel Blockers)
Indications
Arrhythmias
Mechanism of Action
Increase AP Duration, ERP, and QT Interval
Drug Names
Amiodarone
Check Function Tests
Dirty Drug
Ibutilide
Dofetilide
Sotalol
Beta-Blocker
2 mins
Class IV Antiarrhythmics (Ca2+ Channel Blockers)
Indications
SVT
Subarachnoid Hemorrhage
Mechanism of Action
Decrease Conduction Velocity
Increase PR Interval and ERP
Drugs
Verapamil
Diltiazem
Nimodipine
Side Effects
Cardiovascular
Constipation
2 mins
Calcium Channel Blockers (Verapamil and Diltiazem)
Mechanism of Action
Slows AV Conduction
Indications
Angina Pectoris
Arrhythmias
Essential Hypertension
Side Effects
Bradycardia
Hypotension
Constipation
Peripheral Edema
Gingival Hyperplasia
Nursing Consideration
Medication Education
2 mins
Cardiovascular Effects of Beta-Blockers
Cardiac Myocytes and Vasculature
Decrease cAMP
Decreases SA and AV Node Conduction Velocity
Lower Blood Pressure
Decrease O2 Consumption
Decreases Mortality Post-MI
2 mins
Class II Antiarrhythmics (Beta-blockers)
Beta Blockers
Decrease cAMP
cAMP opens Funny Channel (steep phase 4)
cAMP lowers calcium channel threshold
Prolonged PR interval
Increases RR interval
Drug Names
Propranolol (B1/B2 Blocker)
Esmolol (B1 blocker)
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