Deck 7: Rhythms Originating in the Sinus Node

Question 1

Treatment for sinus tachycardia associated with a high fever would be to

A)give atropine.
B)start CPR.
C)give acetaminophen or ibuprofen to get the temperature down.
D)give beta-blockers.

Answer 1

C

Question 2

A pause that occurs when the sinus node's impulse is not conducted out of the sinus node itself is

A)sinus arrest.
B)sinus arrhythmia.
C)sinus bradycardia.
D)sinus block.

Answer 2

D

Question 3

The heart rate in Figure 4 is closest to

A)100.
B)70.
C)150.
D)50.

Answer 3

B

Question 4

Sinus tachycardia's heart rate is

A)60-100.
B)greater than 100.
C)less than 60.
D)greater than 170.

Question 5

Which of the following sinus rhythms would be expected with stimulation of the sympathetic nervous system?

A)Sinus rhythm rate 68
B)Sinus bradycardia rate 45
C)Sinus arrhythmia rate 45-73
D)Sinus tachycardia rate 125

Question 6

The T wave in Figure 4 is

A)inverted.
B)upright.
C)indicative of sinus control of the ventricles.
D)indicative of ventricular depolarization.

Question 7

The rhythm in Figure 3 is

A)sinus tachycardia.
B)sinus rhythm.
C)sinus bradycardia.
D)sinus arrhythmia.

Question 8

Which of the following is TRUE about sinus rhythm?

A)It is regular.
B)It has an irregularly irregular pattern of QRS complexes.
C)It has multiple shapes of P waves.
D)It has wide QRS complexes without preceding P waves.

Question 9

Sinus rhythms all have

A)uniform shape P waves preceding the QRS complexes.
B)multiple shapes of P waves preceding the QRS complexes.
C)a wavy baseline without P waves or QRS complexes.
D)inverted P waves in Lead II.

Question 10

In sinus block

A)the pause is a multiple of the R-R intervals.
B)there are P waves inside the pause.
C)all R-R intervals are constant.
D)the heart rate varies from 100 to 160.

Question 11

Which of the following has a heart rate less than 60?

A)Sinus rhythm
B)Sinus bradycardia
C)Sinus tachycardia
D)Atrial tachycardia

Question 12

The rhythm in Figure 4 is

A)sinus rhythm.
B)sinus bradycardia.
C)sinus rhythm with sinus arrest.
D)sinus tachycardia.

Question 13

In Figure 5,the rhythm shown is

A)sinus rhythm.
B)sinus bradycardia.
C)sinus tachycardia.
D)sinus block.

Question 14

QRS interval in Figure 4 is closest to

A)0.42 seconds.
B)0.10 seconds.
C)0.28 seconds.
D)0.30 seconds.

Question 15

In sinus rhythm,the heart rate is

A)60-100.
B)greater than 100.
C)less than 60.
D)greater than 170.

Question 16

Possible causes of sinus tachycardia include which of the following?

A)Fever
B)Anxiety
C)Congestive heart failure
D)All of the above

Question 17

The sinus rhythm that has a heart rate greater than 100 is

A)sinus rhythm.
B)sinus bradycardia.
C)sinus tachycardia.
D)sinus arrhythmia.

Question 18

Sinus arrhythmia is

A)a regular rhythm.
B)an irregular rhythm.
C)a rhythm that originates in the atria.
D)a rhythm that originates in the AV junction.

Question 19

PR interval in Figure 4 is closest to

A)0.12 seconds.
B)0.28 seconds.
C)0.04 seconds.
D)0.40 seconds.

Question 20

Sinus bradycardia's heart rate is

A)60-100.
B)greater than 100.
C)less than 60.
D)greater than 170.

Question 21

Thyrotoxicosis is a condition associated with which rhythm?

A)Sinus block
B)Sinus arrest
C)Sinus tachycardia
D)Sinus bradycardia

Question 22

All sinus rhythms have

A)upright,matching P waves.
B)wide,bizarre QRS complexes.
C)multiple P waves of varying configurations.
D)heart rates between 40 and 100.

Question 23

The heart rate during sinus tachycardia is less than 60.

Question 24

High fever can cause sinus tachycardia.

Question 25

Which is TRUE about sinus arrest and sinus exit block?

A)Sinus exit block is an irregular rhythm; sinus arrest is regular.
B)Sinus arrest always ends in an escape beat; sinus exit block doesn't.
C)Sinus arrest and sinus exit block can both result in decreased cardiac output.
D)The pause in both sinus exit block and sinus arrest is a multiple of the R-R intervals.

Question 26

The heart rate during sinus bradycardia is greater than 100.

Question 27

The only difference in interpretation criteria between sinus rhythm,sinus bradycardia,and sinus tachycardia is the heart rate.

Question 28

In sinus arrhythmia,the heart rate

A)speeds up during inspiration and expiration.
B)speeds up during inspiration,slows during expiration.
C)slows during inspiration and expiration.
D)slows during inspiration,speeds up during expiration.

Question 29

Atropine speeds conduction through the bundle branches.

Question 30

The heart rate during sinus rhythm is 60-100.

Question 31

Oxygen can help return an abnormal heart rhythm to normal.

Question 32

Atropine is the drug of choice to treat sinus tachycardia.

Question 33

Atropine's mode of action is to

A)speed up the rate of sinus node firing and speed conduction through the AV node.
B)speed impulse conduction through the bundle branches and AV node.
C)slow the rate of conduction through the AV node and slow sinus node firing.
D)speed sinus node firing and slow AV node conduction.

Question 34

A pacemaker is usually needed to treat sinus bradycardia.

Question 35

In which rhythm is an escape beat sometimes seen?

A)Sinus rhythm
B)Sinus bradycardia
C)Sinus arrhythmia
D)Sinus arrest

Question 36

Which of the following is an irregular rhythm originating in the sinus node?

A)Sinus arrhythmia
B)Sinus rhythm
C)Sinus tachycardia
D)Sinus bradycardia

Question 37

In Figure 5,the heart rate is closest to

A)100.
B)40.
C)75.
D)55.

Question 38

Sinus arrhythmia has a pattern that often corresponds with the

A)PR intervals.
B)breathing pattern.
C)P-P intervals.
D)patient's age.

Question 39

Atropine is a medication that would be appropriate for symptomatic

A)sinus tachycardia.
B)sinus bradycardia.
C)sinus rhythm.
D)none of the above.

Question 40

High fever is a common cause of sinus arrest.

Question 41

In sinus rhythms,the QRS complexes should have an interval of ________.

Question 42

The primary treatment of sinus tachycardia in a patient with a temperature of 103 degrees would be to ________.

Question 43

Some signs of decreased cardiac output are pallor,hypotension,and dizziness.

Question 44

The PR interval in sinus rhythms should be ________ from beat to beat.

Question 45

Sinus arrest is best treated by anti-anxiety medication.

Question 46

Sinus arrest can occur at any heart rate.

Question 47

A condition in which the thyroid gland overproduces thyroid hormones and causes the heart rate,temperature,and blood pressure to rise to dangerous levels is called ________.

Question 48

The most crucial criterion to identifying sinus rhythms is the upright matching P waves in Lead II.

Question 49

________ is the only normal heart rhythm.

Question 50

An artificial pacemaker can be used to treat sinus bradycardia.

Question 51

In a sinus arrest,the sinus node________ firing for a time.

Question 52

Diaphoresis is a cold sweat.

Question 53

________ is a rhythm with a heart rate greater than 100.

Question 54

A rhythm with a heart rate less than 60 is ________.

Question 55

All sinus rhythms have a P-QRS-T configuration.

Question 56

Patients with a heart rate of 45 always show symptoms of decreased cardiac output.

Question 57

Sinus node impulses result in a P wave that is ________ in Lead II.

Question 58

Sinus bradycardia is common among well-conditioned athletes.

Question 59

Sinus block can occur at any heart rate.

Question 60

In sinus rhythms,P waves are found ________ the QRS complexes.