Question 1

Which of the following dysrhythmias has more P waves than QRS complexes?

Accepted Answer

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

Question 2

2nd-degree AV heart block, Type I, is an intermittent block at the level of the AV node.

Accepted Answer

A) True 
 B)False  False

Question 3

1st-degree AV heart block:

Accepted Answer

A)  is of little or no clinical significance 
B)  causes decreased cardiac output 
C)  typically progresses to higher degree block 
D)  must be promptly treated with anti-dysrhythmic agents 
A)  is of little or no clinical significance 
B)  causes decreased cardiac output 
C)  typically progresses to higher degree block 
D)  must be promptly treated with anti-dysrhythmic agents A

Question 4

Which of the following originates from the SA node?

Accepted Answer

A)  Idioventricular rhythm. 
B)  Wandering atrial pacemaker. 
C)  Premature junctional complex. 
D)  Second degree AV block, Type I. 
A)  Idioventricular rhythm. 
B)  Wandering atrial pacemaker. 
C)  Premature junctional complex. 
D)  Second degree AV block, Type I.

Question 5

Which of the following dysrhythmias has a "patterned irregular rhythm?"

Accepted Answer

A)  sinus rhythm with occasional PVCs 
B)  3rd degree AV heart block. 
C)  Wenckebach. 
D)  2nd-degree AV heart block, Type II 
A)  sinus rhythm with occasional PVCs 
B)  3rd degree AV heart block. 
C)  Wenckebach. 
D)  2nd-degree AV heart block, Type II

Question 6

2nd-degree AV heart block, Type II:

Accepted Answer

A)  is a complete block at the level of the bundle of His 
B)  is more common and serious than Type I 
C)  eventually progresses to complete AV heart block. 
D)  is considered malignant in the emergency setting where it is symptomatic. 
A)  is a complete block at the level of the bundle of His 
B)  is more common and serious than Type I 
C)  eventually progresses to complete AV heart block. 
D)  is considered malignant in the emergency setting where it is symptomatic.

Question 7

With 3rd-degree AV heart block the:

Accepted Answer

A)  AV node serves as the pacemaker for the atria, typically maintaining a regular rate of 60 to 100 beats per minute. 
B)  impulses from the atria reach the ventricles through an accessory pathway which is situated between the atria and ventricles 
C)  P waves and QRS complexes occur rhythmically and are related to each other. 
D)  pacemaker for the ventricles arises as an escape rhythm from the AV junction or from the ventricles. 
A)  AV node serves as the pacemaker for the atria, typically maintaining a regular rate of 60 to 100 beats per minute. 
B)  impulses from the atria reach the ventricles through an accessory pathway which is situated between the atria and ventricles 
C)  P waves and QRS complexes occur rhythmically and are related to each other. 
D)  pacemaker for the ventricles arises as an escape rhythm from the AV junction or from the ventricles.

Question 8

The most obvious characteristic of 1st-degree AV heart block:

Accepted Answer

A)  is a fast heart rate. 
B)  are PR intervals greater than 0.20 seconds in duration and constant.. 
C)  is an irregular rhythm that seems to repeat itself over and over again. 
D)  Are wide, bizarre-looking QRS complexes. 
A)  is a fast heart rate. 
B)  are PR intervals greater than 0.20 seconds in duration and constant.. 
C)  is an irregular rhythm that seems to repeat itself over and over again. 
D)  Are wide, bizarre-looking QRS complexes.

Question 9

Most occurrences of 3rd-degree AV heart block are well tolerated as long as the escape rhythm is fast enough to generate a sufficient cardiac output to maintain adequate perfusion.

Accepted Answer

A) True 
 B)False

Question 10

Characteristics of 3rd-degree AV heart block include:

Accepted Answer

A)  the presence of inverted P waves that precede each QRS complex. 
B)  PR intervals that get progressively longer in duration. 
C)  a ventricular rate of between 60 and 100 beats per minute. 
D)  P waves that appear normal and seem to march right through the QRS complexes. 
A)  the presence of inverted P waves that precede each QRS complex. 
B)  PR intervals that get progressively longer in duration. 
C)  a ventricular rate of between 60 and 100 beats per minute. 
D)  P waves that appear normal and seem to march right through the QRS complexes.

Question 11

PR intervals of greater than 0.20 are indicative of:

Accepted Answer

A)  a pacemaker site which is either in or close to the AV junction. 
B)  an intermittent blocking of the impulse as it passes through the AV node. 
C)  a delay in conduction of the impulse between the SA node and the ventricles. 
D)  an increased rate of impulse discharge from the SA node. 
A)  a pacemaker site which is either in or close to the AV junction. 
B)  an intermittent blocking of the impulse as it passes through the AV node. 
C)  a delay in conduction of the impulse between the SA node and the ventricles. 
D)  an increased rate of impulse discharge from the SA node.

Question 12

Your patient is a 70-year-old male who passed out at church. He is now awake but seems confused, has a respiratory rate of 20 breaths per minute, a blood pressure of 90/60 and cool, moist skin. You attach the ECG monitor to reveal what appears to be a slow heart rate. A closer examination of the ECG shows there are two P waves preceding each QRS complex and the PR interval for the conducted beats remains constant. This dysrhythmia is:

Accepted Answer

A)  2nd - degree AV block, Type II 
B)  sinus bradycardia 
C)  3rd - degree AV heart block 
D)  Wenckebach 
A)  2nd - degree AV block, Type II 
B)  sinus bradycardia 
C)  3rd - degree AV heart block 
D)  Wenckebach

Question 13

Characteristics of 2nd- degree AV heart block, Type II include:

Accepted Answer

A)  a patterned irregular rhythm 
B)  a rate of greater than 100 beats per minute 
C)  narrow QRS complexes 
D)  PR intervals that vary in duration 
A)  a patterned irregular rhythm 
B)  a rate of greater than 100 beats per minute 
C)  narrow QRS complexes 
D)  PR intervals that vary in duration

Question 14

The feature that stands out in 2nd-degree AV heart block, Type II, is the presence of more P waves than QRS complexes.

Accepted Answer

A) True 
 B)False

Question 15

In _____________ the number of P waves for each QRS complex may be fixed or it may vary.

Accepted Answer

A)  2nd - degree AV heart block, Type II 
B)  1st - degree AV heart block 
C)  2nd - degree AV block, Type I 
D)  idioventricular rhythm 
A)  2nd - degree AV heart block, Type II 
B)  1st - degree AV heart block 
C)  2nd - degree AV block, Type I 
D)  idioventricular rhythm

Question 16

In which of the following types of AV heart block does the PR interval remain constant?

Accepted Answer

A)  3rd- degree AV heart block. 
B)  Wenckebach. 
C)  2nd-degree AV heart block, Type II 
D)  b & c 
A)  3rd- degree AV heart block. 
B)  Wenckebach. 
C)  2nd-degree AV heart block, Type II 
D)  b & c

Question 17

Which of the following is a delay and not a true AV heart block?

Accepted Answer

A)  Wenckebach 
B)  2nd- degree AV heart block, Type II 
C)  3rd- degree AV block 
D)  1st-degree AV block 
A)  Wenckebach 
B)  2nd- degree AV heart block, Type II 
C)  3rd- degree AV block 
D)  1st-degree AV block

Question 18

Characteristics of 2nd- degree AV heart block, Type I include:

Accepted Answer

A)  QRS complexes which are wide and biphasic. 
B)  a rate of between 60 and 100 beats per minute. 
C)  an inverted P wave which follows each QRS complex. 
D)  PR intervals which become progressively longer. 
A)  QRS complexes which are wide and biphasic. 
B)  a rate of between 60 and 100 beats per minute. 
C)  an inverted P wave which follows each QRS complex. 
D)  PR intervals which become progressively longer.

Question 19

With 1st-degree AV heart block:

Accepted Answer

A)  there are more P waves than QRS complexes 
B)  the PR interval is constant 
C)  the AV node grows more and more tired with each impulse it carries through from the atria to the ventricles 
D)  the PR interval is between 0.12 and 0.20 seconds in duration 
A)  there are more P waves than QRS complexes 
B)  the PR interval is constant 
C)  the AV node grows more and more tired with each impulse it carries through from the atria to the ventricles 
D)  the PR interval is between 0.12 and 0.20 seconds in duration

Question 20

3rd-degree AV heart block is:

Accepted Answer

A)  an intermittent block at the level of the bundle of His. 
B)  a complete block of impulse conduction at or below the AV node. 
C)  a delay in conduction of the impulse through the AV node. 
D)  a block in impulse conduction through one or both of the bundle branches. 
A)  an intermittent block at the level of the bundle of His. 
B)  a complete block of impulse conduction at or below the AV node. 
C)  a delay in conduction of the impulse through the AV node. 
D)  a block in impulse conduction through one or both of the bundle branches.

Exam 15: Origin and Clinical Aspects of AV Heart Blocks

Which of the following dysrhythmias has more P waves than QRS complexes?

2nd-degree AV heart block, Type I, is an intermittent block at the level of the AV node.

1st-degree AV heart block:

Which of the following originates from the SA node?

Which of the following dysrhythmias has a "patterned irregular rhythm?"

2nd-degree AV heart block, Type II:

With 3rd-degree AV heart block the:

The most obvious characteristic of 1st-degree AV heart block:

Most occurrences of 3rd-degree AV heart block are well tolerated as long as the escape rhythm is fast enough to generate a sufficient cardiac output to maintain adequate perfusion.

Characteristics of 3rd-degree AV heart block include:

PR intervals of greater than 0.20 are indicative of:

Characteristics of 2nd- degree AV heart block, Type II include:

The feature that stands out in 2nd-degree AV heart block, Type II, is the presence of more P waves than QRS complexes.

In _____________ the number of P waves for each QRS complex may be fixed or it may vary.

In which of the following types of AV heart block does the PR interval remain constant?

Which of the following is a delay and not a true AV heart block?

Characteristics of 2nd- degree AV heart block, Type I include:

With 1st-degree AV heart block:

3rd-degree AV heart block is:

Anatomy and Electrophysiology of the Heart

The Electrocardiogram

Analyzing the Electrocardiogram

Heart Rate

Regularity

P-Waves

QRS Complexes

PR Intervals

ST Segments, T-Waves, QT Intervals, and U-Waves

Overview of Dysrhythmias

Origin and Clinical Aspects of Sinus Node Dysrhythmias

Origin and Clinical Aspects of Atrial Dysrhythmias

Origin and Clinical Aspects of Junctional Dysrhythmias

Origin and Clinical Aspects of Ventricular Dysrhythmias

Pacemakers and Implanted Cardioverter-Defibrillators

12 Lead ECGS

Atrial Enlargement and Ventricular Hypertrophy

Bundle Branch Block

Myocardial Ischemia and Infarction

Other Cardiac Conditions and the ECG

Putting It All Together

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