Drugs to Treat Arrythmias Flashcards Preview

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Flashcards in Drugs to Treat Arrythmias Deck (16):
1

signal originates where

SA Node

2

Which node sends the signal to the ventricles

AV node

3

P wave reflects ___

Depolarization of the SA node

4

PR interval describes ___

time it takes for impulse to go from the SA node to AV node

5

QRS complex describes -___

Depolarization of right and left ventricles

6

T wave shows ____

repolarization of the ventricles

7

U wave shows

Repolarization of interventricular septum

8

Primary AV block

PR interval lengthened beyond .2 seconds

9

secondary AV block

disturbance, delay, interruption of atrial impulse

10

tertiary AV block

complete heart block

11

Class I anti-arrhythmic drugs block

Block Na+ channels

12

Class II anti-arrhythmic drugs are

B-adrenoceptor antagonists

13

Class III anti-arrhythmic drugs prolong

action potential and prolong refractory period (K+ blockers)

14

Class IV anti-arrhythmic drugs are

Ca channel antagonists

15

Beta blockers can diminish ____

Na and Ca currents

16

Blocking Cardiac Ca currents results in

Slower conduction, increased refractory period