Chapter 6 Flashcards
TRUE/FALSE
The term premature ventricular complex is technically more correct than premature ventricular contraction.
true
TRUE/FALSE
Transcutaneous pacing is the treatment of choice for pulseless ventricular tachycardia or ventricular fibrillation.
false
TRUE/FALSE
Medications to suppress an idioventricular rhythm should generally be avoided.
true
TRUE/FALSE
An idioventricular (ventricular escape) rhythm has an intrinsic rate of 40 to 60 beats/min.
false
TRUE/FALSE
Sustained monomorphic VT is often associated with underlying heart disease, particularly myocardial ischemia, and rarely occurs in patients without underlying structural heart disease.
true
Which of the following best describes an idioventricular rhythm?
Essentially regular ventricular rhythm with QRS complexes measuring 0.12 seconds or greater; atrial rate not discernible; ventricular rate 20 to 40 beats/min
What is meant by the term pulseless electrical activity (PEA)?
an organized rhythm on the cardiac monitor, other than vt, although a pulse is not present
How would you differentiate a junctional escape rhythm at 40 beats/min from a ventricular escape rhythm at the same rate?
The junctional escape rhythm will have a narrow QRS complex; the ventricular escape rhythm will have a wide QRS complex.
Which of the following best describes an accelerated idioventricular rhythm (AIVR)?
Essentially regular ventricular rhythm with QRS complexes measuring 0.12 seconds or greater; atrial rate not discernible; ventricular rate 41 to 100 beats/min
Characteristics of accelerated idioventricular rhythm:
Rhythm
Ventricular rhythm is essentially regular.
Rate
41 to 100 (41 to 120 per some cardiologists) beats/min
P waves
Usually absent or, with retrograde conduction to the atria, may appear after the QRS (usually upright in the ST segment or T wave)
PR interval
None
QRS duration
Greater than 0.12 seconds; the T wave frequently in the opposite direction of the QRS complex
The rate of an idioventricular rhythm is _____ beats/min.
20-40
Complete the following ECG criteria for an accelerated idioventricular
Rhythm
Ventricular rhythm is essentially regular.
Rate
41 to 100 (41 to 120 per some cardiologists) beats/min.
P waves
Usually absent or, with retrograde conduction to the atria, may appear after the QRS (usually upright in the ST segment or T wave).
PR interval
None.
QRS duration
Greater than 0.12 seconds; the T wave is frequently in the opposite direction of the QRS complex.
Complete the following ECG criteria for polymorphic ventricular
Rhythm
Ventricular rhythm may be regular or irregular.
Rate
Ventricular rate 150 to 300 beats/min; typically 200 to 250 beats/min.
P waves
None.
PR interval
None.
QRS duration
0.12 seconds or more; there is a gradual alteration in the amplitude and direction of the QRS complexes; a typical cycle consists of 5 to 20 QRS complexes.
