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Pharmacology | Physician Assistant (PA) School Study Aid
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
Selective Beta-1 Blockers
- Characteristics
- "-olol" Suffix
- Drug Names
- Beta-1 Selective
- Atenolol
- Esmolol
- Metoprolol
- Partial Beta agonists
- Acebutolol
1 min
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 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
Digoxin Mechanism and Indication
- Direct inhibition of Na K ATPase
- Indirect inhibition of Na Ca exchanger
- Increase Ca in cell
- Positive Inotropy
- CHF
- Stimulates Vagus Nerve
- Decreased conduction at AV node
- Atrial Fibrillation
1 min
Acute Digoxin Toxicity
- Clinical Symptoms
- Hyperkalemia
- Cholinergic (Nausea, Vomiting, Diarrhea)
- Blurry Yellow Green Vision with Halo of Light
- Arrhythmia
- Bradycardia
- EKG Changes
- Prolonged PR interval
- Decreased QT
- Scooping on EKG
- T Wave Inversion
2 mins
Digoxin Toxicity Treatment
- Activated Charcoal
- Slowly Normalize K+
- Digibind (Anti-Digoxin Fab)
- Magnesium Sulfate
- Lidocaine
- Cardiac Pacing
2 mins
