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ECG Made Easy, Ch. 5

Junctional Rhythms

QuestionAnswer
PJCs are more common than PACs or PVCs. False
A PJC produces a positive (upright) P wave in leads II, III, and aVF that come before, during, or after the QRS. False
Atropine is the drug of choice when treating a symptomatic patient with a junctional rhythm at a rate of 40 beats/min. True
If the AV junction paces the heart, the electrical impulse must travel in a backward direction to activate the atria. This is called ___________. retrograde conduction
A beat originating from the AV junction that appears later than the next expected sinus beat. junctional escape beat
Location of the P wave on the ECG if atrial depolarization precedes ventricular depolarization. Inverted P wave appears before the QRS complex in leads II, III, and aVF.
A beat originating from the AV junction that appears earlier than the next expected sinus beat. Premature junctional complex
Normal rate for the AV junction. 40 to 60 beats/min
Primary waveform used to differentiate PJCs from PACs. P wave
Medication used to increase heart rate. Atropine
Location of the P wave on the ECG, if atrial and ventricular depolarization occur simultaneously. Hidden within the QRS complex (not visible)
Toxicity/excess of this medication is a common cause of junctional dysrhythmias. Digitalis
Name given to a dysrhythmia that originates in the AV junction with a ventricular rate between 61 to 100 beats/min. Accelerated junctional rhythm
Impulse originating from a source other than the SA node. Ectopic
Location of the P wave on the ECG if atrial depolarization occurs after ventricular depolarization. Inverted P wave occurs after the QRS complex in leads II, III, and aVF
Junctional bradycardia ventricular rate Below 40 beats/min
Junctional tachycardia ventricular rate 101 to 180 beats/min
. Accelerated junctional rhythm 61 to 100 beats/min
Junctional rhythm 40 to 60 beats/min
List four (4) reasons why the AV junction may assume responsibility for pacing the heart. SA node fails discharge (s arrest); SA node impulse generated, blocked as exits (SA block); SA node rate of discharge slower than of AV junc (s brady; slower phase s arrhyth); SA node impulse generated & conducted thru atria; not to ventricles (AV block)
Created by: djoyo14
 

 



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