QuestionSBA
QuestionChoice
There is no phase 5 of the cardiac cycle
10026835
e
Phase 5
QuestionChoice
Class II and class IV antiarrhythmics act on the plateau phase
10026832
b
Phase 2
QuestionChoice
Class II antiarrhythmics act on phase 4
10026834
d
Phase 4
QuestionChoice
Class I antiarrhythmics act on phase 0
10026833
c
Phase 0
QuestionChoice
Phase 3 describes the repolarisation phase of the cardiac cycle. Class III antiarrhythmics (including sotalol and amiodarone) significantly prolong the cardiac action potential and, therefore, the refractory period of cardiac tissue. This can result in a prolonged QT interval (which may, paradoxically, cause arrhythmias)
10026831
a
Phase 3
Concept
Chapter
2693
5925
Class III antiarrhythmics
Topic
169
Cardiovascular pharmacology
17764
At which phase of the cardiac cycle do class III antiarrhythmics act?
a