Deck 7: Heart Blocks

Question 1

In Complete Heart Block,the PR interval is:

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

Answer 1

D

Question 2

Third Degree Heart Block is also considered:

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

Answer 2

A

Question 3

Wenckebach is a ________ Degree Heart Block.

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

Answer 3

B

Question 4

Second Degree Heart Block is caused by:

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

Question 5

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

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

Question 6

The most diagnostic feature of Wenckebach is:

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

Question 7

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)atria.
C)AV junction.
D)ventricles.

Question 8

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

A)Underlying rhythm
B)Pulse deficit
C)QT ratio
D)Bundle branch block

Question 9

In Second Degree Heart Block (Type I and Type II),there is (are):

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

Question 10

In Complete Heart Block,if a junctional focus is controlling the heart,the rate will be ________ beats per minute.

A)below 20
B)20-40
C)40-60
D)60-100

Question 11

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

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

Question 12

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

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

Question 13

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

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

Question 14

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

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

Question 15

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

A)methodically increases.
B)randomly increases.
C)consistently decreases.
D)is irregular.

Question 16

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)SA Node.
B)atria.
C)AV junction.
D)ventricles.

Question 17

In Third Degree Heart Block:

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

Question 18

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

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

Question 19

First Degree Heart Block is caused by:

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

Question 20

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

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

Question 21

The most serious of the four AV blocks is:

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

Question 22

The difference between Wenckebach and CHB is that:

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

Question 23

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

A)There are always more P waves than QRS complexes.
B)The PRI is consistent on conducted beats.
C)Not all the P waves produce QRS complexes.
D)The PRI varies,with no obvious pattern.

Question 24

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

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

Question 25

AV dissociation is a feature of:

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

Question 26

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

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