Chapter 5 Flashcards
TRUE/FALSE
The AV junction consists of the AV node and the nonbranching portion of the bundle of His.
True
TRUE/FALSE
An escape rhythm is initiated by a lower pacemaker site when the sinoatrial (SA) node slows or fails to initiate an impulse.
true
TRUE/FALSE
Adenosine is the drug of choice when treating a symptomatic patient with a junctional rhythm at a rate of 40 beats/min.
false
Atropine (not adenosine) is the drug of choice when treating a symptomatic patient with a junctional rhythm at a rate of 40 beats/min.
TRUE/FALSE
The pacemaker cells in the AV junction are located near the nonbranching portion of the bundle of His.
true
A beat originating from the AV junction that appears later than the next expected sinus beat is called a _____.
junctional escape beat
Which of the following medications increases heart rate by accelerating the SA node discharge rate and blocking the vagus nerve?
Atropine
In a junctional rhythm viewed in lead II, where is the location of the P wave on the ECG if atrial and ventricular depolarization occur simultaneously?
During the QRS complex
Common causes of junctional dysrhythmias may include acute coronary syndromes and _____.
digitalis toxicity
A junctional escape rhythm occurs because of _____.
slowing of the rate of the heart’s primary pacemaker
In a junctional rhythm viewed in lead II, where is the location of the P wave on the ECG if atrial depolarization precedes ventricular depolarization?
Before the QRS complex
The usual rate of nonparoxysmal junctional tachycardia is _____ beats/min.
101 to 140
The atrioventricular (AV) junction consists of the _____.
AV node and nonbranching portion of the bundle of His
If seen, the P wave of a rhythm originating in the AV junction will appear _____ in lead II.
inverted
Depending on the severity of the patient’s signs and symptoms, management of slow rhythms originating from the AV junction may require intervention including _____.
intravenous atropine
