Deck 7: Heart Blocks

Question 1

In Third Degree Heart Block the pacemaker can be in either the:

A)atria or AV junction.
B)SA node or ventricles.
C)SA node or atria.
D)AV junction or ventricles.

Answer 1

D

Question 2

In Type II Second Degree Heart Block with variable conduction, the R- R interval will:

A)randomly increase.
B)be irregular.
C)consistently decrease.
D)methodically increase.

Answer 2

B

Question 3

In Third Degree Heart Block:

A)the atria and ventricles are completely dissociated.
B)the SA node and AV node are blocked.
C)the bundle branches are blocked.
D)some beats are conducted, while others are not.

Answer 3

A

Question 4

In First Degree Heart Block, the QRS complex should be:

A)0.12- 0.20 sec.
B)greater than 0.20 sec.
C)the same as the PRI.
D)less than 0.12 sec.

Question 5

In Third Degree Heart Block with a rate of 40- 60 bpm, with a QRS of less than 0.12 sec., you should suspect that the pacemaker controlling the heart is located in the:

A)SA node.
B)AV junction.
C)ventricles.
D)atria.

Question 6

The type of block in which the P waves have no relationship to the QRS complexes is:

A)Type II Second Degree Heart Block.
B)Wenckebach Type I Second Degree Heart Block).
C)Third Degree Heart Block.
D)First Degree Heart Block.

Question 7

The most diagnostic feature of Wenckebach is:

A)both atrial and ventricular rates are regular.
B)the PRIs get progressively longer until one is dropped.
C)the PRI is consistently regular.
D)there are always 2 P waves for every QRS complex.

Question 8

Third Degree Heart Block is also considered:

A)SA node block.
B)bundle branch block.
C)Complete Heart Block.
D)intermittent block.

Question 9

In a Wenckebach, not every P wave is followed by:

A)another P wave.
B)a QRS complex.
C)a compensatory pause.
D)a PR interval.

Question 10

In Complete Heart Block, if a junctional focus is controlling the ventricles, the rate will be beats per minute.If the rate is 20- 40 beats per minute and the QRS measures over 0.12 sec., you should suspect that the pacemaker controlling the heart is located in the .

A)60- 100; ventricles
B)20- 40; atria
C)40- 60; AV junction
D)below 20; SA node

Question 11

The difference between Wenckebach and CHB is that:

A)CHB has more P waves than QRS complexes, whereas Wenckebach always has one P wave for every QRS complex.
B)CHB has a regular R- R whereas Wenckebach is irregular.
C)CHB has an irregular P- P interval, whereas it's regular in Wenckebach.
D)CHB has a constant PRI, whereas in Wenckebach it gets progressively longer.

Question 12

In First Degree Heart Block, the PR interval is sec.

A)greater than 0.20
B)less than 0.12
C)0.16- 0.20
D)0.12- 0.16

Question 13

In First Degree Heart Block, the pacemaker site is usually in the:

A)ventricles.
B)Bundle of His.
C)AV node.
D)SA node.

Question 14

All of the rhythms characterized as heart blocks are caused by conduction disturbances at the:

A)atrial pathways.
B)AV node.
C)SA node.
D)Purkinje fibers.

Question 15

Second Degree Heart Block is caused by:

A)intermittent AV conduction.
B)loss of fail- safe mechanism.
C)SA node failure.
D)resistance in ventricles.

Question 16

The most serious of the four AV blocks is:

A)Type II Second Degree.
B)Wenckebach Type I Second Degree).
C)Third Degree.
D)First Degree.

Question 17

In Second Degree Heart Block Type I and Type II), you will have:

A)one P wave for every QRS complex.
B)no relationship between P waves and QRS complexes.
C)more P waves than QRS complexes.
D)more QRS complexes than P waves.

Question 18

First Degree Heart Block is caused by:

A)intermittent conduction through the ventricles.
B)a complete block in the ventricles.
C)slow conduction through the AV node.
D)a block at the SA node.

Question 19

Wenckebach is a Degree Heart Block.

A)First
B)Type I Second
C)Type II Second
D)Third

Question 20

In First Degree Heart Block, what additional feature must you identify?

A)bundle branch block
B)QT ratio
C)pulse deficit
D)underlying rhythm

Question 21

In Complete Heart Block, the PR interval is:

A)constant but longer than normal.
B)normal duration and constant.
C)normal duration but changing.
D)P waves are not related to QRS complexes.

Question 22

The most important diagnostic feature for any of the AV blocks is the:

A)PRI.
B)rate.
C)P wave.
D)QRS complex.

Question 23

Which of the following is NOT a feature of Type II Second Degree Heart Block?

A)All the P waves produce QRS complexes.
B)There are always 2 P waves for every QRS complex.
C)The PRI is consistent on conducted beats.
D)The PRIs get progressively longer until one is dropped.

Question 24

AV dissociation is a feature of:

A)Wenckebach Type I Second Degree Heart Block).
B)Third Degree Heart Block.
C)First Degree Heart Block.
D)Type II Second Degree Heart Block.

Question 25

In First Degree Heart Block, conduction through the AV node will be:

A)prolonged on every beat.
B)blocked completely.
C)normal on every beat.
D)conducted only intermittently.