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Flashcards in Heart Blocks Deck (35):
0

What is a heart block?

The result of conduction disturbances in the AV node

1

What does a first degree heart block indicate?

Obstruction at the AV node is not complete. There's a delay before being transmitted to the ventricles.

2

What is a second degree heart block?

The block is intermittent. Some impulses will be conducted to the ventricles but not others

3

What is a third degree heart block?

The block is complete and no impulses will be conducted to the ventricles

4

What is another name for third degree heart block?

Compete heart block

5

What are the four types of heart blocks?

First degree
Second degree type 1
Second degree type 2
Third degree

6

What is a subcategory of type 1 second degree heart blocks?

Wenckebach

7

First degree heart block
Regularity

Depends on underlying rhythm

8

First degree heart block
Rate

Depends on underlying rhythm

9

First degree heart block
P waves

Upright
Uniform

10

First degree heart block
PRI

Greater than .20 constant

11

First degree heart block
QRS

Less than .12

12

With second degree heart blocks what gets depolarized more; atria or ventricles?

Atria because the AV node blocks some impulses from being conducted to ventricles

13

What is variable conduction?

The ratio of P waves to QRS completes change across a strip

2:1 3:1 3:1 2:1

14

Type 2 second degree heart block
Regularity

RRI can be regular or irregular
PPI is regular

15

Type 2 second degree heart block
Rate

Usually bradycardia can be one half to one third the normal rate

16

Type 2 second degree heart block
P waves

Upright uniform
More P waves than QRS complexes

17

Type 2 second degree heart block
PRI

Constant
Can be greater than .20

18

Type 2 second degree heart block
QRS

Less than .12

19

What happens to PRI in Wenckebach 2nd degree heart blocks?

The PRI get progressively longer until you don't see a QRS complex

20

Wenckebach Type 1 second degree heart block
Regularity

Irregular

21

Wenckebach Type 1 second degree heart block
Rate

Slightly slower than normal

22

Wenckebach Type 1 second degree heart block
P waves (3)

Upright
Uniform
Some p waves not followed by QRS complexes

23

Wenckebach Type 1 second degree heart block
PRI

Progressively longer until P wave is blocked

24

Wenckebach Type 1 second degree heart block
QRS

Less than .12

25

If the rate is 20-40 and QRS is greater than .12 where are the impulses originated?

Ventricles

26

If the rate is 40-60 and the QRS is less than .12 where are the impulses originated?

AV junction

27

What occurs when two pacemakers control the upper and lower chambers of the heart without regard for each other?

Atrioventricular dissociation

28

What is the relationship of p waves and QRS complexes in complete heart blocks?

There is no relationship between the two

29

What is the distinction between Wenckebach and complete heart blocks?

The RRI in complete heart blocks are regular
The RRI in Wenckebach are irregular

30

Third degree heart block
Regularity

Regular

31

Third degree heart block
Rate

AR normal
VR 40-60 if junctional 20-40 if ventricular

32

Third degree heart block
P waves (3)

Upright
Uniform
More p waves than QRS complexes

33

Third degree heart block
PRI

No relationship between p waves and QRS complexes

34

Third degree heart block
QRS

Less than .12 if junctional
More than .12 if ventricular