class IV's Flashcards
1
Q
What do IV (4) block
A
Ca channel Supraventricular only
2
Q
What are the IV (4) drugs
A
Verapamil Diltiazem
3
Q
How do IV act
A
Decrease phase 4 spont depol Slow conduction SA and AV Effects on vascular and cardiac SM
4
Q
What kind of Ca channel blockers are class IV antiarrhythmics
A
Non-Dihydropyridines
5
Q
Which class IV is more selective for Myocardium
A
Verapamil
6
Q
How do class IV act
A
Bind open, depolarized channels Decrease HR, contractility, conduction velocity
7
Q
When do you give class IV
A
SVT A-fib and flutter HTN, angina
8
Q
Why do class IV cause transient increase in BP and CO
A
They are negative inotropes
9
Q
What do you not give class IV with and why
A
Digoxin Dofetilide Simvastatin Lovastatin
10
Q
What is a functional Ca antagonist
A
Mg
