Chapter 4 Flashcards
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Individuals with preexcitation syndrome are predisposed to tachydysrhythmias.
true
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In atrial fibrillation, the AV node attempts to protect the ventricles from the hundreds of impulses bombarding it per minute by blocking many of the impulses generated by the irritable sites in the atria.
true
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Upon conversion of atrial fibrillation to sinus rhythm, the patient should be observed for signs of a possible stroke.
true
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The presence of an accessory pathway should be considered in atrial fibrillation with a ventricular rate faster than 180 beats/min.
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Most patients with type I atrial flutter develop atrial fibrillation.
false
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In atrial fibrillation, fibrillatory waves are referred to as f waves.
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Delivery of an electrical current timed for delivery during the QRS complex is called defibrillation.
false
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Multifocal atrial tachycardia is another name for atrial fibrillation.
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A macroreentrant circuit is one that involves a small area of heart tissue, usually a few centimeters or less.
false
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The ventricular rhythm in atrial fibrillation is usually “irregularly irregular.”
true
What is meant by the term controlled atrial fibrillation?
The overall ventricular rate is less than 100 beats/min.
Which of the following correctly describes multifocal atrial tachycardia?
Atrial and ventricular rhythms are irregular.
Characteristics of multifocal atrial tachycardia:
Rhythm
Usually irregular as the pacemaker site shifts from the SA node to ectopic atrial locations or AV junction
Rate
Faster than 100 beats/min
P waves
Size, shape, and direction may change from beat to beat; it may be upright, inverted, biphasic, rounded, flat, pointed, notched, or buried in the QRS complex
PR interval
Varies as the pacemaker site shifts from the SA node to ectopic atrial locations or AV junction
QRS duration
0.11 seconds or less unless abnormally conducted
The most common type of supraventricular tachycardia (SVT) is _____.
AV nodal reentrant tachycardia (AVNRT)
Atrial fibrillation is characterized by _____.
an erratic, wavy baseline and irregular ventricular rhythm