Deck 23: Antiarrhythmic Drugs

Question 1

What is a life-threatening arrhythmia caused by electrical conduction disturbances?

A) Atrial fibrillation
B) Ventricular fibrillation
C) Ectopic foci
D) Premature ventricular contraction

Answer 1

Ventricular fibrillation

Question 2

Calcium channel blockers affect the SA node by

A) Slowing depolarization and decreasing the heart rate
B) Slowing repolarization and decreasing the heart rate
C) Increasing depolarization and decreasing the heart rate
D) Increasing repolarization and decreasing the heart rate

Answer 2

Slowing depolarization and decreasing the heart rate

Question 3

This class of antiarrhythmic drugs work by slowing depolarization and conduction in Phase 0 of the action potential.

A) Class 1
B) Class 2
C) Class 3
D) Class 4

Answer 3

Class 1

Question 4

Calcium channel blockers work by

A) Increasing myocardial conduction
B) Increasing myocardial contractility
C) Reducing myocardial conduction
D) Reducing myocardial contractility

Question 5

Beta blockers are mainly indicated for _____ and for prevention of recurrent _____.

A) Supraventricular arrhythmias, ischemia
B) Supraventricular arrhythmias, myocardial infarctions
C) Ventricular arrhythmias, ischemia
D) Ventricular arrhythmias, myocardial infarctions

Question 6

A potentially fatal problem that can occur with amiodarone is

A) Malignant hyperthermia
B) Circulatory collapse
C) Pulmonary fibrosis
D) Ventricular fibrillation

Question 7

Antiarrhythmic drugs produce therapeutic effects by all of the following except

A) Decreasing phase 2
B) Slowing phase 0
C) Prolonging phases 1-3
D) Decreasing phase 4 automaticity

Question 8

Of the Class IA antiarrhythmics,procainamide is favored over quinidine because procainamide

A) Has less anticholinergic and antihistaminic actions
B) Has less antiadrenergic and antihistaminic actions
C) Has less anticholinergic and alpha blocking actions
D) Has less antiadrenergic and muscarinic blocking actions

Question 9

Myocardial contraction plays an important role in phase _____,where an influx of _____ ions predominate.

A) 1, Na
B) 1, Ca
C) 2, Na
D) 2, Ca

Question 10

A prolongation of the QT interval can lead to all of the following except

A) Hypoglycemia
B) Hypotension
C) Fainting
D) Ventricular arrhythmias

Question 11

Disopyramide produces a _____ in conduction and _____ of the refractory period.

A) Increase, contraction
B) Increase, prolongation
C) Decrease, contraction
D) Decrease, prolongation

Question 12

All of these are drugs that will slow AV conduction to protect the ventricles in atrial fibrillation except

A) Beta blockers
B) Atropine
C) Calcium channel blockers
D) Digoxin

Question 13

A common adverse effect from quinidine overdosage is

A) Hypertension
B) Tachypnea
C) Cinchonism
D) Dry mouth

Question 14

Ectopic foci are often caused by

A) Increased activity by the SA node
B) Increased activity by the AV node
C) Delayed or blocked conduction of electrical impulses
D) Decreased cholinergic innervation of neurons

Question 15

Counting the number of QRS waves occurring within a one minute period allows for _____ to be determined.

A) Cardiac output
B) Heart rate
C) Stroke volume
D) Premature atrial contractions

Question 16

Atropine is used to treat sinus bradycardia because it increases all of the following except

A) Heart rate
B) AV conduction
C) Blood pressure
D) SA conduction

Question 17

Class 3 antiarrhythmic drugs work by blocking the _____ of _____ ions during the repolarization phase.

A) Influx, sodium
B) Efflux, sodium
C) Influx, potassium
D) Efflux, potassium

Question 18

Antiarrhythmic drugs primarily affect the activity of the following ion channels except

A) Cl
B) Na
C) K
D) Ca

Question 19

In atrial flutter,one would expect the ECG to have P waves in what type of pattern?

A) Sawtooth
B) Bag of worms
C) In triplets
D) Inverted

Question 20

A type of arrhythmia that originates in the SA node and causes a sustained heart rate over 100 beats per minute.

A) Paroxysmal supraventricular tachycardia
B) Ventricular tachycardia
C) Supraventricular tachycardia
D) Sinus tachycardia