Question 1

The rhythm in Figure 4 is 
A)Sinus rhythm.
B)Sinus bradycardia.
C)Sinus rhythm with sinus arrest.
D)Sinus tachycardia.

Accepted Answer

A

Question 2

Which of the following has a heart rate less than 60?
A)Sinus rhythm
B)Sinus bradycardia
C)Sinus tachycardia
D)Atrial tachycardia

Accepted Answer

Sinus bradycardia is a sinus rhythm with a heart rate less than 60 beats per minute. Sinus rhythm can have a heart rate between 60-100 bpm, sinus tachycardia has a heart rate greater than 100 bpm, and atrial tachycardia is a fast heartbeat originating in the atria.

Question 3

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.

Accepted Answer

All sinus rhythms originate from the sinoatrial node, which typically produces upright, matching P waves in the ECG.

Question 4

Sinus tachycardia's heart rate is
A)60-100.
B)Greater than 100.
C)Less than 60.
D)Greater than 170.

Accepted Answer

Sinus tachycardia is defined as a heart rate greater than 100 beats per minute. Choices A and C are incorrect as they describe normal sinus rhythm and sinus bradycardia, respectively. Choice D is incorrect as a heart rate greater than 170 would be considered supraventricular tachycardia, which is a separate entity from sinus tachycardia.

Question 5

In Figure 5,the rhythm shown is 
A)Sinus rhythm.
B)Sinus bradycardia.
C)Sinus tachycardia.
D)Sinus block.

Accepted Answer

The answer of In Figure 5,the rhythm shown is 
A)Sinus...

Question 6

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.

Accepted Answer

Sinus rhythm is a regular rhythm characterized by a consistent shape and timing of P waves followed by QRS complexes.

Question 7

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.

Accepted Answer

Sinus tachycardia is a normal response to fever. Therefore, treatment should aim to bring down the fever with medications such as acetaminophen or ibuprofen. Atropine, beta-blockers, and CPR are not indicated for sinus tachycardia associated with a fever.

Question 8

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.

Accepted Answer

Atropine works by blocking the action of the vagus nerve on the heart, which results in an increased heart rate by speeding up the rate of sinus node firing and conduction through the AV node.

Question 9

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.

Accepted Answer

In sinus block, there is a pause in the cardiac cycle due to the failure of the sinus node to initiate an impulse. This pause is usually a multiple of the R-R intervals, which means that the duration of the pause is a whole number multiple of the length of each R-R interval. Therefore, choice A is the best option. Choices B, C, and D are not characteristic of sinus block, as there are no P waves during the pause, the R-R intervals may not be constant, and the heart rate may not necessarily vary between 100 to 160 bpm.

Question 10

The heart rate in Figure 4 is closest to 
A)100.
B)70.
C)150.
D)50.

Accepted Answer

The answer of The heart rate in Figure 4 is...

Question 11

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.

Accepted Answer

Sinus block occurs when the impulse generated by the sinus node is not conducted out of the sinus node. This can result in a pause between normal sinus beats. Sinus arrest is a more severe form of sinus block where the pause is longer and can result in symptoms. Sinus arrhythmia is a normal variation in the rate of the sinus node and is not associated with pauses or blocks. Sinus bradycardia is a slower than normal rate of the sinus node, but not necessarily associated with pauses or blocks.

Question 12

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

Accepted Answer

Stimulation of the sympathetic nervous system can increase heart rate, which would result in sinus tachycardia (option D). Options A and C describe normal sinus rhythms, and option B describes a slower than normal sinus rhythm.

Question 13

In Figure 5,the heart rate is closest to 
A)100.
B)40.
C)75.
D)55.

Accepted Answer

The answer of In Figure 5,the heart rate is closest...

Question 14

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.

Accepted Answer

Sinus arrhythmia is an irregular rhythm that occurs due to changes in heart rate during respiration. It is a normal finding and should not be confused with other types of arrhythmias that may be abnormal and require treatment.

Question 15

QRS interval in Figure 4 is closest to 
A)0.42 seconds.
B)0.10 seconds.
C)0.28 seconds.
D)0.30 seconds.

Accepted Answer

The answer of QRS interval in Figure 4 is closest...

Question 16

In sinus rhythm,the heart rate is
A)60-100.
B)Greater than 100.
C)Less than 60.
D)Greater than 170.

Accepted Answer

Sinus rhythm is the normal rhythmic beating of the heart, originating from the sinus node in the right atrium. In adults, the normal range for sinus rhythm is 60-100 beats per minute. Therefore, the best choice is A). Choices B), C), and D) are outside the normal range for sinus rhythm.

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.

Accepted Answer

A sinus rhythm with a heart rate greater than 100 beats per minute is called sinus tachycardia. This is a normal response to exercise, stress, or certain medications, but can also be indicative of an underlying illness or condition.

Question 18

Sinus bradycardia's heart rate is
A)60-100.
B)Greater than 100.
C)Less than 60.
D)Greater than 170.

Accepted Answer

Sinus bradycardia is defined as a heart rate less than 60 beats per minute.

Question 19

Atropine is a medication that would be appropriate for symptomatic
A)Sinus tachycardia.
B)Sinus bradycardia.
C)Sinus rhythm.
D)None of the above.

Accepted Answer

Atropine is a medication that can be used to treat symptomatic bradycardia, but is not indicated for sinus tachycardia or normal sinus rhythm.

Question 20

PR interval in Figure 4 is closest to 
A)0.12 seconds.
B)0.28 seconds.
C)0.04 seconds.
D)0.40 seconds.

Accepted Answer

The PR interval is the time between the start of the P wave and the start of the QRS complex. In Figure 4, the PR interval appears to be approximately 3 small squares, which is equivalent to 0.12 seconds on the ECG paper. This is within the normal range of PR interval duration (0.12-0.20 seconds). Therefore, choice A) is the best choice.

Quiz 7: Rhythms Originating in the Sinus Node

The rhythm in Figure 4 is

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

All sinus rhythms have

Sinus tachycardia's heart rate is

In Figure 5,the rhythm shown is

Which of the following is true about sinus rhythm?

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

Atropine's mode of action is to

In sinus block,

The heart rate in Figure 4 is closest to

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

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

In Figure 5,the heart rate is closest to

Sinus arrhythmia is

QRS interval in Figure 4 is closest to

In sinus rhythm,the heart rate is

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

Sinus bradycardia's heart rate is

Atropine is a medication that would be appropriate for symptomatic

PR interval in Figure 4 is closest to