Deck 22: Putting It All Together

Question 1

Sinus bradycardia:

A) is a slow heart rate.
B) arises from the AV junction.
C) results from sympathetic nervous system stimulation.
D) is caused by failure of the SA node.

Answer 1

is a slow heart rate.

Question 2

In SA node arrest a slow heart is caused by:

A) blockage of the AV node.
B) failure of the heart's primary pacemaker.
C) increased excitability of the heart muscle.
D) a rapid firing of the atria.

Answer 2

failure of the heart's primary pacemaker.

Question 3

An escape pacemaker that arises from the AV junction as a result of SA node arrest will have a rate of __________ beats per minute.

A) 50 to 80
B) 20 to 40
C) 40 to 60
D) 10 to 50

Answer 3

40 to 60

Question 4

A slow ventricular heart rate can be seen in dysrhythmias where there is a rapid atrial rate because:

A) the AV node is blocked and not all the impulses are carried through to the ventricles.
B) there is excessive sympathetic nervous system stimulation of the AV node.
C) the atria fire and bombard the AV node so rapidly that not all the impulses are conducted through to the ventricles.
D) there is excessive parasympathetic nervous system stimulation of the ventricles.

Question 5

Sinus tachycardia:

A) is a fast rate, greater than 150 beats per minute.
B) arises from the ventricles.
C) is brought about by an ectopic pacemaker.
D) is due to sympathetic nervous system stimulation.

Question 6

Ventricular tachycardia has a rate of _____ beats per minute.

A) 100 to 180
B) 100 to 160
C) 100 to 250
D) 160 to 200

Question 7

In atrial flutter and atrial fibrillation the ventricular rate:

A) is the same as the atrial rate.
B) is between 60 and 100 beats per minute.
C) is most often slower than normal.
D) can be slower, normal or faster.

Question 8

Premature beats:

A) appear in middle of the R-R interval.
B) come early in the cardiac cycle.
C) produce a lengthening in the R-R interval between the normal (preceding) beat and the premature beat.
D) arise from only the ventricles.

Question 9

Sinus arrest:

A) is seen as a regular rhythm.
B) occurs when the SA node initiates an early impulse.
C) produces a sudden absence of a P wave, QRS complex and T wave in an otherwise normal looking rhythm.
D) produces a shorter than normal R-R interval because of the dropped beat.

Question 10

The rhythm is called slightly irregular when:

A) the P-P intervals and R-R vary just somewhat.
B) there is a cyclical pattern to the irregularity.
C) the rhythm seems to abruptly start and stop.
D) the rhythm varies from beat to beat.

Question 11

The term ________ is used to describe a dysrhythmia that has a sudden, rapid onset.

A) unexpected
B) reentrant
C) reflex
D) paroxysmal

Question 12

Premature complexes that occur every other (second) complex, every third complex or every fourth complex produce ________ irregularity.

A) slight
B) patterned
C) paroxysmal
D) varying

Question 13

When a rhythm speeds up and slows down in a rhythmic fashion it is referred to as _________ irregularity.

A) slight
B) frequent
C) patterned
D) profound

Question 14

The dysrhythmia that produces a totally irregular rhythm is called:

A) sinus arrest
B) atrial fibrillation
C) wandering atrial pacemaker
D) 2nd degree AV heart block, Type I

Question 15

When the atrial to ventricular conduction ratio changes in atrial flutter or AV heart block it:

A) results in the rhythm being regularly irregular.
B) produces a regular rhythm.
C) is called totally irregular.
D) changes the distance between the R-R intervals producing an irregular rhythm.

Question 16

The P' waves in atrial tachycardia:

A) have a different morphology than normal P waves.
B) are buried in the T wave of the preceding beat.
C) look the same as those seen in sinus tachycardia.
D) are indiscernible.

Question 17

P' waves that continuously change in appearance indicate that the:

A) impulses are originating from one site.
B) atria are firing at a rate of between 250 and 350 beats per minute.
C) impulses are arising from different locations in the atria.
D) atria are firing in a rapid, chaotic manner.

Question 18

When the atrial waveforms appear in a saw-toothed pattern it reflects that the:

A) impulses are arising from different locations in the atria.
B) atria are firing at a rate of between 250 and 350 beats per minute.
C) a delay in the movement of the electrical impulse between the right and left atria.
D) impulse is being blocked as it travels through the bundle of His.

Question 19

When the atria fire faster than 350 beats per minute:

A) it produces a chaotic-looking baseline with no discernible P waves.
B) "F" waveforms are seen.
C) the P' waves continuously change in appearance.
D) there are more upright and round P waves than there are QRS complexes.

Question 20

Inverted P' waves occur when the:

A) atria are firing at a rate of between 250 and 350 beats per minute.
B) impulses arise from the middle of the right atrium.
C) atria are firing in a rapid, chaotic manner stimulating all parts of the atria at the same time.
D) electrical impulse originates in or near the AV junction and travels upward into the atria causing retrograde depolarization.

Question 21

When there are more P waves than QRS complexes it indicates that:

A) impulses are arising from the lower-right atrium near the AV node or in the left atrium.
B) the atria are firing so fast that not all the impulses can pass through the AV node and some are blocked.
C) impulses are initiated in the SA node or other ectopic sites in the atria but are blocked and do not reach the ventricles.
D) impulses are arising from many different locations in the atria.

Question 22

When the P waves seem to "march through" the QRS complexes it indicates:

A) a complete blockage of the AV node.
B) the atria are firing at a much faster rate than the ventricles.
C) the impulses are arising from the middle of the left atrium.
D) the atria are firing chaotically at a rate of greater than 350 beats per minute.

Question 23

Shorter than normal PR intervals may be seen in:

A) sinus dysrhythmia.
B) premature atrial complexes that arise in the upper or middle right atrium.
C) junctional escape rhythm.
D) sinus tachycardia.

Question 24

Preexcitation:

A) leads to a delayed depolarization of the ventricles.
B) occurs when an impulse arises from a supraventricular site and travels through the AV node to the ventricles more quickly than normal.
C) leads to a longer than normal PR interval.
D) produces a characteristically abnormal slurring at the onset of the QRS complex and a short PR interval.

Question 25

The PR intervals get progressively longer in:

A) sinus dysrhythmia.
B) 2nd degree AV heart block, Type I.
C) 1st - degree AV heart block.
D) 3rd - degree AV heart block.

Question 26

The PR intervals are not measurable in:

A) wandering atrial pacemaker.
B) atrial flutter.
C) 2nd degree AV heart block, Type I.
D) premature atrial complexes.

Question 27

With 2nd-degree AV heart block, Type II, the PR intervals associated with the P waves which are followed by a QRS complex will be:

A) shorter than normal.
B) constant.
C) variable.
D) constantly changing.

Question 28

Tachycardia that arises above the ventricles is called supraventricular tachycardia.

Question 29

1st-degree AV heart block can occur with any rhythm originating in the SA node, such as sinus rhythm, bradycardia, or tachycardia.