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Anti-Arrhythmics
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 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 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 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
Adenosine (Adenocard)
Mechanism
Slows AV Conduction
Indications
Supraventricular Tachycardia (Paroxysmal)
Side Effects
Bradycardia
Flushing
Dyspnea
Considerations
Rapid IV Push
Caffeine and Theophylline Decrease Effectiveness
Dipyridamole May Intensify Effects
2 mins
Lidocaine
Mechanism
Blocks Na+ Channels
Indications
Ventricular Arrhythmia
Anesthetic
Side Effects
Paresthesias
Seizures
Respiratory Depression
Drowsiness
Consideration
Anesthetic Effects Extended with Epinephrine
1 min
Magnesium Sulfate
Mechanism
Muscle Relaxant
Indications
Preterm Labor Contractions
Preeclampsia
Side Effects
Warm Feeling
Hypotension
Decreased Deep Tendon Reflexes (DTRS)
Decreased Respiratory Rate
Decreased Urine Output
Paralytic Ileus
Antidote
Calcium Gluconate
2 mins
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