Deck 11: AV Blocks

Question 1

Which strip is consistent with Mobitz I second-degree AV block (Wenckebach)?

A)A
B)B
C)C
D)D

Answer 1

B

Question 2

The PR interval in Figure 18

A)is constant.
B)varies.
C)is about 0.12 seconds.
D)is about 0.20 seconds.

Answer 2

B

Question 3

AV dissociation is a hallmark of

A)first-degree AV block.
B)Mobitz I second-degree AV block (Wenckebach).
C)Mobitz II second-degree AV block.
D)third-degree AV block.

Answer 3

D

Question 4

In third-degree AV block,if the block is at the AV node

A)the QRS will be wide and bizarre.
B)the P waves will be tall and pointy.
C)the QRS will be narrow.
D)there will be no P waves.

Question 5

Complete heart block is another name for

A)Wenckebach.
B)Mobitz II second-degree AV block.
C)third-degree AV block.
D)first-degree AV block.

Question 6

In which kind of AV block do NONE of the sinus impulses reach the ventricles?

A)First-degree AV block
B)Wenckebach
C)Mobitz II second-degree AV block
D)Third-degree AV block

Question 7

The type of AV block characterized by a prolonged PR interval is

A)Wenckebach.
B)Mobitz II second-degree AV block.
C)third-degree AV block.
D)first-degree AV block.

Question 8

2:1 AV block can be caused by either

A)third-degree AV block or Wenckebach.
B)Wenckebach or Mobitz II second-degree AV block.
C)first-degree AV block or Wenckebach.
D)Mobitz II second-degree AV block or third-degree AV block.

Question 9

In Figure 18,which of the heart's pacemakers is controlling the ventricle?

A)Sinus node
B)Atrium
C)AV node
D)Ventricle

Question 10

Wenckebach is a type of

A)first-degree AV block.
B)second-degree AV block.
C)third-degree AV block.
D)fourth-degree AV block.

Question 11

In first-degree AV block,the site of the block is the

A)sinus node.
B)AV node.
C)interatrial tracts.
D)bundle branches.

Question 12

In third-degree AV block,the site of the block is either the

A)sinus node or the internodal tracts.
B)AV node or the Purkinje fibers.
C)bundle branches or the AV node.
D)sinus node or the AV node.

Question 13

Which strip is consistent with third-degree AV block?

A)A
B)B
C)C
D)D

Question 14

Third-degree AV block has

A)one P wave to each QRS.
B)a varying R-R interval.
C)a constant PR interval.
D)a varying PR interval.

Question 15

The type of AV block characterized by two P waves to each QRS and a constant PR interval is

A)first-degree AV block.
B)third-degree AV block.
C)Wenckebach.
D)2:1 AV block.

Question 16

The QRS interval in Figure 18 is closest to

A)0.12 seconds.
B)0.20 seconds.
C)0.32 seconds.
D)0.40 seconds.

Question 17

The rhythm in Figure 18 is

A)Wenckebach.
B)Mobitz II second-degree AV block.
C)third-degree AV block.
D)junctional bradycardia.

Question 18

Which strip is consistent with sinus rhythm with first-degree AV block?

A)A
B)B
C)C
D)D

Question 19

In AV blocks,the P-P interval is

A)regular.
B)irregular.
C)absent.
D)the same as the R-R interval.

Question 20

Which strip is consistent with Mobitz II second-degree AV block?

A)A
B)B
C)C
D)D

Question 21

Third-degree AV block usually needs no treatment.

Question 22

The AV blocks with a constant PR interval are

A)first-degree AV block and Wenckebach.
B)Wenckebach and third-degree AV block.
C)first-degree AV block and Mobitz II second-degree AV block.
D)first-degree AV block and third-degree AV block.

Question 23

2:1 AV block is characterized by one P wave to every other QRS.

Question 24

Treatment for third-degree AV block usually includes

A)digitalis.
B)lidocaine.
C)amiodarone.
D)pacemaker.

Question 25

All AV blocks involve a disturbance in conduction somewhere between the atria and the ventricles.

Question 26

In AV blocks,the site of the block is either the AV node or the bundle branches.

Question 27

The most dangerous of the AV blocks is Mobitz II second-degree AV block.

Question 28

Wenckebach is characterized by

A)gradually prolonging PR intervals.
B)constant PR intervals.
C)absent P waves.
D)wide bizarre QRS complexes.

Question 29

Wenckebach usually does not need treatment.

Question 30

Third-degree AV block is also called Wenckebach.

Question 31

In third-degree AV block,only a few of the sinus impulses get through to the ventricles.

Question 32

Treatment for first-degree AV block involves

A)atropine.
B)digitalis.
C)electrical shock to the heart.
D)removing the cause.

Question 33

In Mobitz II second-degree AV block,where do the P waves originate?

A)Sinus node
B)AV node
C)Atrium
D)Ventricle

Question 34

First-degree AV block is characterized by a prolonged QRS interval.

Question 35

The type of heart block that involves a prolonged PR interval and no dropped beats is Mobitz II second-degree AV block.

Question 36

All AV blocks are caused by a block at the bundle branches.

Question 37

Pacemakers are typically used for Mobitz II second-degree AV block and third-degree AV block.

Question 38

First-degree AV block is best treated with a pacemaker.

Question 39

In first-degree AV block,all sinus impulses do get through to the ventricles.

Question 40

Mobitz II second-degree AV block can progress to third-degree AV block if left untreated.

Question 41

In first-degree AV block,________ sinus impulses get through to the ventricles.

Question 42

In AV blocks,the underlying rhythm is ________.

Question 43

The origin of the P waves in AV blocks is the ________.

Question 44

Wenckebach is also known as ________.

Question 45

Why does atropine not work when the block is at the bundle branches?

Question 46

Mobitz II second-degree AV block involves a block at either the AV node or the ________.

Question 47

The AV block characterized by gradually prolonging PR intervals until a QRS is blocked is ________.

Question 48

In a second-degree AV block,some impulses from the sinus node ________ to the ventricles; others don't.

Question 49

What kind of symptoms does first-degree AV block cause?

Question 50

AV blocks involve a block in conduction between ________.