Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Cardio I - ECG > Issues With The AV Node - Heart Blocks > Flashcards

Issues With The AV Node - Heart Blocks Flashcards

1
Q 
Impulse begins in SA node but is delayed on way to AV node OR AV conduction time is prolonged 
Prolonged PRI (time from SA to AV)
Possible slow HR bc impulse takes a long time for ventricular contraction to occur
A

1st degree heart block

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

1st degree heart block

A

Impulse begins in SA node but is delayed on way to AV node OR AV conduction time is prolonged
Prolonged PRI (time from SA to AV)
Regular R-R
Possible slow HR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Why can a 1st degree heart block have a possible slow HR?

A

Bc the impulse takes a long time for ventricular contraction to occur

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are possible causes for a 1st degree heart block?

A

CAD
MI
BBs (can slow impulse too much)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Can a 1st degree heart block be asymptomatic?

A

Yes unless there is significant bradycardia - it can progress to a worsening block

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Main telemetry of 1st degree heart block?

A

Increased PRI

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

A 2nd degree AV block, Type I is also known as…

A

Wenkebach or Mobitz I heart block

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Progressive prolongation of PRI until one impulse doesn’t get through
P wave before every QRS until a P wave stands alone (conduction blocked ==> no QRS)
R-R interval irregular (bc of dropped QRS)

A

2nd degree AV block, Type I (Wenkebach or Mobitz I heart block)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

2nd degree AV block, Type I (Wenkebach or Mobitz heart block)

A

Progressive increase in PRI until an impulse is dropped and there is no QRS
R-R interval irregular (bc of dropped QRS)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

2nd degree AV block, Type I (Wenkebach or Mobitz I heart block) possible causes…

A

RCA disease/infarction

BBs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Does a 2nd degree AV block Type I (Wenkebach or Mobitz I heart block) usually progress?

A

No - usually asymptomatic and rarely progresses - need to monitor it ==> QRS dropping can cause CO sx if occur frequently enough

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

2nd degree AV block, Type II (Mobitz II)

A

No change in PRI
Blocked conduction of ONE IMPULSE to ventricles
R-R interval varies (bc QRS drones)
P:QRS > 1:1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

No change in PRI
Blocked conduction of ONE IMPULSE to ventricles
R-R interval varies (bc QRS drops)
P:QRS > 1:1

A

2nd degree AV block, Type II (Mobitz II)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Telemetry characteristics of 2nd degree AV block, Type II (Mobitz II)…

A

PRI stays the same

The dropped QRS does not always occur every other

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

2nd degree AV block, Type II (Mobitz II) possible causes…

A 
MI (LAD)
AV node infarction (RCA)
Digoxin toxicity 
Drop in CO if dropped QRS happen more frequently/min that's Type I (bc lose ventricular complex c dropped QRS)
Pacemaker 
Atropine
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Which type of heart block can progress to a complete heart block, an emergent situation?

A

2nd degree AV block, Type II (Mobitz II)

17
Q

A 3rd degree AV block is AKA…

A

Complete heart block

18
Q

Complete heart block
No impulses from above the ventricles are conducted through the AV node
No communication between A/Vs
2 syncythiums act independently
Regular P waves
P waves have no relation to QRS, but QRS is regular
R-R interval regular
WIDE QRS (bc impulse to Vs coming from BELOW AV node)
HR 30-50bpm

A

3rd degree heart block

19
Q

3rd degree heart block HR…

A

30-50bpm

20
Q

3rd degree heart block

A

Complete heart block
No impulses from above ventricles conducted through AV node
No communication between A/Vs
2 syncythiums act independently
Regular P waves
P waves have no relation to QRS, but QRS regular
R-R interval regular
WIDE QRS (bc impulse to Vs coming from BELOW AV node)

21
Q

What is a characteristic of a 3rd degree heart block?

A

The atria and ventricles contract @ their own paces and don’t communicate - they are not in sync (act independently of e/o)

22
Q

3rd degree heart block telemetry characteristics…

A

AV valves closing during systole when atria contract, so there is a decrease in atrial kick and a decrease in CO bc of decreased ventricular filling ==> P waves not related to QRS
No PRI
N/A QRS duration calculation

23
Q

3rd degree heart block possible causes…

A 
MI
Digoxin toxicity 
Drop in CO (dizziness, SOB, angina, diaphoresis)
Permanent pacemaker 
Atropine
24
Q

COMPLETE HEART BLOCK =

A

MEDICAL EMERGENCY

Cardio I - ECG (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions