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Antidysrhythmic
Cardio
Question | Answer |
---|---|
class 1a | disopyramide; procainamide; quinidine |
class 1b | lidocaine; tocainide |
class 1c | tambocor |
class II | atenolol; metoprolol; propranolol |
class III | bretylium; ibutulide |
class IV | diltiazem; verapamil |
unclassified | adenosine |
class 1a | exert action on sodium channels by blocking them; slow repolarization and increase APD |
class 1b | exert action on sodium channels by blocking them; accelerate repolarization and decrease APD |
class 1c | exert action on sodium channels by blocking them; little effect on APD |
class II | beta-blockers. reduce sympathetic nervous system stimulation to heart and thus slow transmission through conduction system; decrease oxygen needed by heart |
class III | increase APD prolonging repolarization in phase 3; block potassium channels |
class IV | CCBs. inhibit slow-channel pathways that are calcium dependent |
unclassified | slows conduction time through AV node; stops the heart |