Heart Blocks

Question 1

What does a first degree heart block indicate?

Answer 1

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

Question 2

What is a second degree heart block?

Answer 2

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

Question 3

What is a third degree heart block?

Answer 3

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

Question 4

What is another name for third degree heart block?

Answer 4

Compete heart block

Question 5

What are the four types of heart blocks?

Answer 5

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

Question 6

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

Answer 6

Wenckebach

Question 7

First degree heart block

Regularity

Answer 7

Depends on underlying rhythm

Question 8

First degree heart block

Rate

Answer 8

Depends on underlying rhythm

Question 9

First degree heart block

P waves

Answer 9

Upright

Uniform

Question 10

First degree heart block

PRI

Answer 10

Greater than .20 constant

Question 11

First degree heart block

QRS

Answer 11

Less than .12

Question 12

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

Answer 12

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

Question 13

What is variable conduction?

Answer 13

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

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

Question 14

Type 2 second degree heart block

Regularity

Answer 14

RRI can be regular or irregular

PPI is regular

Question 15

Type 2 second degree heart block

Rate

Answer 15

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

Question 16

Type 2 second degree heart block

P waves

Answer 16

Upright uniform

More P waves than QRS complexes

Question 17

Type 2 second degree heart block

PRI

Answer 17

Constant

Can be greater than .20

Question 18

Type 2 second degree heart block

QRS

Answer 18

Less than .12

Question 19

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

Answer 19

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

Question 20

Wenckebach Type 1 second degree heart block

Regularity

Answer 20

Irregular

Question 21

Wenckebach Type 1 second degree heart block

Rate

Answer 21

Slightly slower than normal

Question 22

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

Answer 22

Upright
Uniform
Some p waves not followed by QRS complexes

Question 23

Wenckebach Type 1 second degree heart block

PRI

Answer 23

Progressively longer until P wave is blocked

Question 24

Wenckebach Type 1 second degree heart block

QRS

Answer 24

Less than .12

Question 25

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

Answer 25

Ventricles

Question 26

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

Answer 26

AV junction

Question 27

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

Answer 27

Atrioventricular dissociation

Question 28

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

Answer 28

There is no relationship between the two

Question 29

What is the distinction between Wenckebach and complete heart blocks?

Answer 29

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

Question 30

Third degree heart block | Regularity

Answer 30

Regular

Question 31

Third degree heart block | Rate

Answer 31

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

Question 32

``` Third degree heart block P waves (3) ```

Answer 32

Upright Uniform More p waves than QRS complexes

Question 33

Third degree heart block | PRI

Answer 33

No relationship between p waves and QRS complexes

Question 34

Third degree heart block | QRS

Answer 34

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

Question 35

What is a heart block?

Answer 35

The result of conduction disturbances in the AV node