Atrial fibrillation is characterized by
Question 1Atrial fibrillation is characterized by _____.
an erratic, wavy baseline and irregular ventricular rhythm
“saw-tooth”- or “picket-fence”-shaped waveforms preceding each QRS
one P wave before each QRS and a regular ventricular rate of 60 to 100 beats/min
P waves occurring before, during, or after the QRS complex; when seen, they are inverted
Question 2Which of the following are possible causes of sinus bradycardia?
Elevated temperature, pain
Increased intracranial pressure, beta-blocker overdose
Hypoxia, fright, caffeine-containing beverages
Hypovolemia, administration of sympathomimetics
Question 3An ECG rhythm strip shows a regular ventricular rhythm at a rate of 30 beats/min, more P waves than QRS complexes (the P waves occur regularly), a variable PR interval, and a QRS duration of 0.14 seconds. This rhythm is _____.
2:1 AV block
third-degree AV block
second-degree AV block type I
second-degree AV block type II
Question 4How are frequent PACs usually managed?
Defibrillation
Synchronized cardioversion
Correcting the underlying cause
Administration of medications such as atropine or epinephrine
Question 5What is meant by the term pulseless electrical activity (PEA)?
A chaotic rhythm that is likely to degenerate into cardiac arrest
An organized rhythm on the cardiac monitor (other than VT), although a pulse is not present
A slow rhythm with a wide QRS complex
A flat line on the cardiac monitor
Question 6Which of the following are possible causes of sinus tachycardia?
Hypothermia, hypovolemia
Hypoxia, calcium channel blocker overdose
Fever, pain, anxiety
Vomiting, vagal maneuvers
Question 7A delta wave is an ECG characteristic associated with which of the following dysrhythmias?
Junctional rhythm
AV nodal reentrant tachycardia (AVNRT)
Wolff-Parkinson-White (WPW) syndrome
Accelerated idioventricular rhythm (AIVR)
Question 8 Tall, peaked T waves observed on the ECG are most commonly seen in patients with _____.
hypokalemia
hyponatremia
hyperkalemia
hypernatremia
Question 9An ECG rhythm strip shows a ventricular rate of 46 bpm, a regular rhythm, a PR interval of 0.14 seconds, a QRS duration of 0.06 seconds, and one upright P wave before each QRS. This rhythm is _____.
sinus rhythm
sinus bradycardia
sinus arrest
sinoatrial block
Question 10To determine whether the ventricular rhythm on an ECG tracing is regular or irregular, compare _____ intervals.
PR
R to R
TP
P to
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