Question 1

Which of the following is the most distinguishing characteristic that helps identify junctional dysrhythmias?

Accepted Answer

A)   Narrow QRS complexes.
B)   An irregular rhythm.
C)   Inverted P' waves.
D)   PR intervals that are between 0.12 and 0.20 seconds in duration.

Question 2

PR intervals of less than 0.12 seconds indicate:

Accepted Answer

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

Question 3

Patients with WPW are vulnerable to PSVT.

Accepted Answer

A) True 
 B)False  False

Question 4

Impulses that originate in the AV junction travel:

Accepted Answer

A)   upward and cause backward or retrograde depolarization of the atria
B)   horizontally, first depolarizing the skeleton of the heart then the atria and ventricles
C)   mostly downward
D)   across the ventricular myocardium depolarizing the ventricles in an abnormal manner

Question 5

Impulses that originate in the AV junction produce inverted P' waves (when they would otherwise be upright) with a P'R interval that is less than 0.12 seconds in duration.

Accepted Answer

A) True 
 B)False

Question 6

Treatment of symptomatic junctional escape includes:

Accepted Answer

A)   administering atropine.
B)   administering beta blockers.
C)   treating the underlying cause.
D)   defibrillation

Question 7

Causes of accelerated junctional rhythm include:

Accepted Answer

A)   increased vagal tone over the SA node.
B)   increased automaticity of the AV node
C)   ventricular irritability
D)   impulses traveling along an accessory pathway

Question 8

Causes of junctional escape rhythm include:

Accepted Answer

A)   increased vagal tone over the SA node.
B)   increased automaticity of the AV node
C)   ventricular irritability
D)   digitalis toxicity

Question 9

Preexcitation syndromes occur when accessory conduction pathways exist between the atria and ventricles that bypass the AV node and bundle of His and allow the atria to depolarize the ventricles earlier than usual.

Accepted Answer

A) True 
 B)False  False

Question 10

The sustained rapid ventricular rates and retrograde depolarization of the atria in junctional tachycardia can lead to compromised cardiac output in patients with underlying heart disease.

Accepted Answer

A) True 
 B)False

Question 11

When every third beat is a PJC, it is called ______ PACs.

Accepted Answer

A)   unifocal
B)   bigeminal
C)   trigeminal
D)   quadrigeminal

Question 12

P' waves that originate from the AV junction are most often buried in or follow the QRS complex.

Accepted Answer

A) True 
 B)False

Question 13

Match the following junctional rhythms with the appropriate heart rate. beats per minute dysrhythmiasjunctional tachycardia:
-accelerated junctional rhythm

Accepted Answer

A)  less than 43
B)  40 to 63
C)  60 to 103
D)  100 to 183

Question 14

Rhythms that originate in the AV junction, the area around the AV node and the bundle of His, are referred to as ______ rhythms.

Accepted Answer

A)   junctional
B)   atrial
C)   ventricular
D)   sinus

Question 15

In junctional escape rhythm, the pacemaker site is in the:

Accepted Answer

A)   SA node
B)   atrial and internodal conduction pathways
C)   AV junction
D)   right bundle branch C

Question 16

Match the following junctional rhythms with the appropriate heart rate. beats per minute dysrhythmiasjunctional tachycardia:
-slow junctional escape

Accepted Answer

A)  less than 42
B)  40 to 62
C)  60 to 102
D)  100 to 182

Question 17

Premature junctional complexes:

Accepted Answer

A)   are preceded by an upright P' wave.
B)   are typically followed by a compensatory pause.
C)   have a narrow QRS complex.
D)   have inverted T waves.

Question 18

Match the following junctional rhythms with the appropriate heart rate. beats per minute dysrhythmiasjunctional tachycardia:
-junctional escape rhythm

Accepted Answer

A)  less than 40
B)  40 to 60
C)  60 to 100
D)  100 to 180

Question 19

Which of the following is a junctional dysrhythmia?

Accepted Answer

A)   wandering atrial pacemaker
B)   accelerated junctional rhythm
C)   sick sinus syndrome
D)   PAC

Question 20

Criteria for WPW include:

Accepted Answer

A)   a PR interval less than 0.12 seconds.
B)   wide QRS complexes due to the presence of a delta wave.
C)   elevated ST segments and inverted T waves.
D)   a and b

Exam 13: Origin and Clinical Aspects of Junctional Dysrhythmias

Which of the following is the most distinguishing characteristic that helps identify junctional dysrhythmias?

Correct AnswerverifiedShow Answer

PR intervals of less than 0.12 seconds indicate:

Correct AnswerverifiedShow Answer

Patients with WPW are vulnerable to PSVT.

Correct AnswerverifiedFalse

Impulses that originate in the AV junction travel:

Correct AnswerverifiedShow Answer

Impulses that originate in the AV junction produce inverted P' waves (when they would otherwise be upright) with a P'R interval that is less than 0.12 seconds in duration.

Correct AnswerverifiedShow Answer

Treatment of symptomatic junctional escape includes:

Correct AnswerverifiedShow Answer

Causes of accelerated junctional rhythm include:

Correct AnswerverifiedShow Answer

Causes of junctional escape rhythm include:

Correct AnswerverifiedShow Answer

Preexcitation syndromes occur when accessory conduction pathways exist between the atria and ventricles that bypass the AV node and bundle of His and allow the atria to depolarize the ventricles earlier than usual.

Correct AnswerverifiedFalse

The sustained rapid ventricular rates and retrograde depolarization of the atria in junctional tachycardia can lead to compromised cardiac output in patients with underlying heart disease.

Correct AnswerverifiedShow Answer

When every third beat is a PJC, it is called ______ PACs.

Correct AnswerverifiedShow Answer

P' waves that originate from the AV junction are most often buried in or follow the QRS complex.

Correct AnswerverifiedShow Answer

Match the following junctional rhythms with the appropriate heart rate. beats per minute dysrhythmiasjunctional tachycardia: -accelerated junctional rhythm

Correct AnswerverifiedShow Answer

Rhythms that originate in the AV junction, the area around the AV node and the bundle of His, are referred to as ______ rhythms.

Correct AnswerverifiedShow Answer

In junctional escape rhythm, the pacemaker site is in the:

Correct AnswerverifiedC

Match the following junctional rhythms with the appropriate heart rate. beats per minute dysrhythmiasjunctional tachycardia: -slow junctional escape

Correct AnswerverifiedShow Answer

Premature junctional complexes:

Correct AnswerverifiedShow Answer

Match the following junctional rhythms with the appropriate heart rate. beats per minute dysrhythmiasjunctional tachycardia: -junctional escape rhythm

Correct AnswerverifiedShow Answer

Which of the following is a junctional dysrhythmia?

Correct AnswerverifiedShow Answer

Criteria for WPW include:

Correct AnswerverifiedShow Answer

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False

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False

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C

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