QuestionSBA
QuestionChoice
This is incorrect. Atenolol is a beta-blocker which belongs to the V-W class II. An example of an antiarrhythmic drug from class IV would be verapamil. These drugs inhibit calcium channels, affecting phases 0 and 4 of the cardiac action potential.
10025899
e
Class IV
QuestionChoice
This is incorrect. Atenolol is a beta-blocker which belongs to the V-W class II. An example of an antiarrhythmic drug from class Ib would be lidocaine. This class of drugs acts by blocking fast sodium channels.
10025897
c
Class Ib
QuestionChoice
This is incorrect. Atenolol is a beta-blocker which belongs to the V-W class II. An example of an antiarrhythmic drug from class III would be amiodarone. Class III drugs act by blocking potassium channels, increasing the action potential recovery period of key structures within the heart.
10025898
d
Class III
QuestionChoice
This is correct. Atenolol is a beta-blocker which belongs to the V-W class II. Beta-blockers are beta-1-adrenergic antagonists, which work to decrease the heart rate.
10025895
a
Class II
QuestionChoice
This is incorrect. Atenolol is a beta-blocker which belongs to the V-W class II. An example of an antiarrhythmic drug from class Ia would be procainamide. This class of drugs acts by blocking fast sodium channels.
10025896
b
Class Ia
Concept
Chapter
2693
4566
Class II anti-arrythmics: Beta-blockers
Topic
169
Cardiovascular pharmacology
17577
A 66 year old female presents to A&E after a week long history of palpitations, breathlessness and fatigue. She is found to have an irregularly irregular pulse. An ECG confirms atrial fibrillation at a rate of 120 beats per minute. She is prescribed atenolol to control her heart rate.

Which of the following Vaughan-Williamson (V-W) classifications does atenolol belong to?
a