Chapter 9

Question 1

Junctional rhythms

Answer 1

arise from tissue located between the right atrium and right ventricle

Question 2

Junctional rhythm travel

Answer 2

the impulse travels antegrade towards the ventricles and retrograde toward the atria

Question 3

P waves in Junctional rhythm

Answer 3

can be inverted preceding the QRS, inverted following the QRS, or hidden inside the QRS

Question 4

The QRS in the junctional rhythms

Answer 4

could be positive or negative depending on the lead

Question 5

PJC

Answer 5

heart rate - can occur at any rate
regularity - regular but interrupted by a premature beat
P waves - inverted
QRS - present
causes - drugs, nicotine, hypoxia, heart disease

Question 6

Junctional Bradycardia

Answer 6

heart rate - less than 40
regularity - regular
P waves -inverted
QRS - present
causes - vagal stimulation, hypoxia, sinus node ischemia, heart disease
effects - decrease cardiac output
treatment - atropine, pacemaker, epinephrine, or dopamine infusions

Question 7

Junctional Rhythm

Answer 7

heart rate - 40-60
regularity - regular
P waves - inverted
QRS - present
causes - vagal stimulations, hypoxia, sinus node ischemia, heart disease
treatment - atropine, pacemaker, epinephrine or dopamine infusion

Question 8

Accelerated Junctional

Answer 8

heart rate - 60-100
regularity - regular
P waves - inverted
QRS - present
causes - heart disease, stimulant drugs, caffeine

Question 9

Junctional Tachycardia

Answer 9

heart rate - greater than 100
regularity - regular
P waves - inverted
QRS - present
causes - digitalis toxicity, heart disease, stimulants
effects - decreased cardiac output
treatment - stop digitalis, start beta blockers, calcium channel blockers

Question 10

SVT

Answer 10

Junctional Tachycardia with no visible P waves