L34 Arrhythmia

Question 1

Conducting order

Answer 1

SA node
AV node
AV bundle
Purkinje fibers

Question 2

P wave

Answer 2

depolarization of SA node

Question 3

PR interval represents

Answer 3

time it take for impulse to travel from sinus node thru av node

Question 4

QRS represents

Answer 4

depolarization of right and left ventricles

Question 5

Ventricles during the ST segment

Answer 5

Depolarized

Question 6

T wave

Answer 6

repolarization of ventricles

Question 7

U wave

Answer 7

Repolarization of interventricular septum

Question 8

Four main types of arrhythmias

Answer 8

Extra beats
Supraventricular tacycardia
Ventricular arrhythmia
Bradyarrhythmia

Question 9

1st degree AV block
2nd degree
3rd degree

Answer 9

1: PR interval lengthened beyond .2 sec.
2: Distubance/delay in atrial implulse (extra p waves)
3: complete heart block, SA impulse does not propagate (p waves with nothing else)

Question 10

Cardiac phases

Answer 10

0: Na in
1: K, Cl out
2: Ca in K out
3: K out
4

Question 11

Class I antiarrhythmic drugs

Answer 11

Class I: block Na Phase 0

Question 12

Class IA, IB, IC
Action potential
State of channel
Kinetics

Answer 12

IA: lengthen duration of action potential: bind to open state of channel: intermediate
IB: Shorten duration of action potential: bind to inactive channel: rapid
IC: Minimal effects on action potential: bind to open state of channel: Slow

Question 13

Class II antiarrhythmic drugs

Answer 13

Beta adrenoceptor antagonist
Deminish Phase IV 
Decrease heart rate
Prolong AV conduction
Can diminish both Na and Ca currents

Question 14

Class III Anti-arrhythmic drugs

Answer 14

Prolong Action potential and refractory period.
Phase 1 and 2
K Channel blockers

Question 15

Class IV Antiarrhythmic drugs

Answer 15

Block Ca channels

Phase 2