Antidysrythmics Flashcards

1
Q

where is the origin of supra ventricular tachycardias?

A

the atria

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2
Q

what is the most common type of supra ventricular tachycardia?

A

atrial fibrillation

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3
Q

Why is AV block desirable with supra ventricular dysrhythmias?

A

because less of the underside activity would get transmitted to ventricles

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4
Q

ventricular/atrial cardiac muscle cells depend on?

A

sodium and potassium

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5
Q

action potential of ventricular/atrial muscle cells start with ______ and end with _______

A

start with sodium influx and end with potassium efflux

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6
Q

Class 1 antidysrhythmic drugs

A

sodium channel blockers

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7
Q

Class 2 antidysrythmics

A

beta blockers

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8
Q

Class 3 antidysrhythmics

A

potassium channel blockers and others

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9
Q

Class 4 antidysrthymics

A

calcium channel blockers

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10
Q

class 5 antidysrhythmics

A

adenosine and digoxin

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11
Q

All class 1 antidysrhythmics block?

A

sodium channels and slow depolarization

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12
Q

Class 1A prototype?

A

quinidine

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13
Q

quinidine is used for?

A

acute onset atrial fibrillation

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14
Q

quinidine slows atrial and ventricular rates but?

A

does not affect rhythm

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15
Q

wolff-parkinson-white syndrome is associated with?

A

quinidine

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16
Q

Class 1 B prototype?

17
Q

lidocaine is used for ______ only

A

ventricular dysrhythmias

18
Q

class II prototype?

A

metoprolol

19
Q

how does metoprolol work?

A

reduces or blocks SNS stimulation and creates AV block

20
Q

Class III prototype?

A

amiodarone

21
Q

how does amiodarone work?

A

it blocks potassium channels therefore prolonging depolarization and cardiac action potential

22
Q

downside of amioderone?

A

can have very serious adverse effects if used for longer than 6 months.

23
Q

amioderone is commonly used in those who are?

A

resistant to other drugs

24
Q

Prototype for class IV?

A

diltiazem and verapamil

25
Where do diltiazem and verapamil act?
on the AV node to inhibit Ca entry and reduce conduction velocity
26
Diltiazem and verapamil are not used for?
ventricular dysrhythmias
27
diltiazem and verapamil control?
rate for atrial fibrillation and flutter
28
what are the unclassified antridysrhythmics?
adenosine and digoxin
29
How does adenosine work?
slows conduction through the AV node and causes AV block
30
What is the half life of adenosine?
20 to 30 seconds
31
adenosine is only administered as?
fast IV push