ECG Interpretation Flashcards
What are examples of Sodium & Potassium channel blockers?
Procainamide
Quinidine
Amiodarone
What is the mechanism of action of Sodium & Potassium channel blockers?
decrease Na+ & K+ to prolong QT interval
What are Sodium & Potassium channel blockers used to treat?
ventricular dysrhythmias
What are examples of Sodium Channel Blockers?
Lidocaine
Phenytoin
What is the mechanism of action of Sodium Channel Blockers?
decreased Na+ prolongs the QRS
What are Sodium Channel blockers used to treat?
atrial & ventricular arrhythmias
What are examples of Potassium Channel Blockers?
Ibutillide
Bretylium
Sotalol
What is the mechanism of action of Potassium Channel Blockers?
decreases K+ efflux during repolarization to prolong QT interval
What are examples of Beta Blockers?
Esmolol
Propranolol
Labetalol
Metoprolol
What is the mechanism of action of Beta Blockers?
decrease Ca+ influx
negative inotrope/chronotrope
What are examples of Calcium Channel Blockers?
Verapamil
Diltiazem
What is the mechanism of action of Calcium Channel Blockers?
decrease SA/AV node automaticity
decrease AV conductivity
negative inotrope
What is the mechanism of action of Adenosine?
decreases Ca+ influx
increases K+ efflux
hyperpolarization of membrane
What is the mechanism of action of Digoxin?
inhibits Na+/K+ pump
increases intracellular Ca+
increases contractility
decreases AV conduction velocity
What is the mechanism of action of Magnesium?
regulates the movement of ions within myocardium
Which phase does Calcium Channel Blockers work at?
Phase 0 at the SA and AV nodes
Phase 2 on ventricular action
Which phase does Beta Blockers work at?
Phase 0 slow atrial rate
Which phase does Sodium Channel Blockers work at?
Phase 0 reducing velocity of action potential
Which phase does Potassium Channel Blockers work at?
Phase 3 prolong QT interval and increase effective refractory period
