QuestionSBA
QuestionChoice
This is an example of a class 3 anti-arrhythmic like amiodarone which delays repolarisation by blocking potassium channels and is used to treat arrhythmias such as ventricular fibrillation.
10000180
e
Inhibiting K+ channels
QuestionChoice
This is an example of beta-blockers like atenolol or bisoprolol. They block the sympathetic action of the heart by agonising beta-1 receptors and therefore slowing the AV conduction in the heart.
10000179
d
Activate beta-1 receptors to block sympathetic stimulation of the heart
QuestionChoice
This describes the mechanism of a sodium channel blocker such as flecainide used to reduce depolarisation and action potential amplitude in arrhythmias like atrial fibrillation.
10000178
c
Inhibit Na+ thus reducing the amplitude of action potentials
QuestionChoice
The pericardium is the sac around the heart. Whilst the Na/K ATPase pump is inhibited by digoxin, this occurs in the myocardium, not the pericardium.
10000177
b
Inhibition of Na/K ATPase ion pumps in the pericardium
QuestionChoice
Digoxin is used for patients with atrial fibrillation, heart failure and hypotension and works by inhibiting the Na/K ATPase pump in the myocardium resulting in negative chronotropy and positive ionotropy.
10000176
a
Inhibition of Na/K ATPase ion pumps in the myocardium
Concept
Chapter
2693
3722
Digoxin
Topic
134
Cardiology
12582
Which of the following accurately described the mechanism of digoxin?
a