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WorksheetsPharmacology: Class Ia Anti-arrhythmics
Total questions: 11
Worksheet time: 7mins
Class I anti-arrhythmic drugs are what type of channel blockers?
Na+ Channel Blockers
K+ Channel Blockers
Ca++ Channel Blockers
β Blockers
MOA for Class I antiarrhythmics?
Inhibit Ventricular Contractility and Slow conduction velocity
Increase Ventricular Contractility and Speed up conduction velocity
What is the Class Ia antiarrhythmic final effect?
Increased QRS, QT
Action potential and Ventricular Refractory Period are Prolonged
Decreased QRS, QT
Action potential and ventricular refractory period are shortened
Class Ia Mnemonic?
Para Qada Desorden
Procainamide, Quinidine, Disopyramide
Clinical use of Ia Antiarrhythmics?
Broad Spectrum
Works on supraventricular and ventricular disorders
Narrow Spectrum
Strictly used for ventricular disorders
When is Procainamide used?
Recent A-Fib Onset
Afib Maintenence
Myocardial Infarction
Cardiac Arrest
When is quinidine used?
Maintenence of NSR post A-Fib Conversion
Converting Afib to NSR
Effects of Class Ia antiarrhythmics on warfarin and digoxin?
Increased Effect
Decreased Effect
No Effect
What can cause increased effect of class Ia drugs?
Anything that prevents their excretion
XX
What should be checked every 2 weeks when using procainamide?
CBC
Signs of SLE-Like Reaction
Drawbacks to Class Ia antiarrhythmics?
Mad as a Hatter
Hot as a Hare
Blind as a Bat
Red as a Beet
Dry as a Bone
Proarrhythmic
Seizures can occur with Procainamide
Quinidine = BAD GI Side Efffects
Disopyramide = Ach SE, CI in Glaucoma
