Atrial fibrillation is characterized by _____
a. one P wave before each QRS and a regular ventricular rate of 60 to 100 beats/min
b. an erratic, wavy baseline and irregular ventricular rhythm
c. "saw-tooth"– or "picket-fence"–shaped waveforms preceding each QRS
d. P waves occurring before, during, or after the QRS complex; when seen, they are inverted
B
Characteristics of atrial fibrillation:
Rhythm Ventricular rhythm usually irregularly irregular
Rate Atrial rate usually 400 to 600 beats/min; ventricular rate variable
P waves No identifiable P waves, fibrillatory waves present; erratic, wavy baseline
PR interval Not measurable
QRS duration 0.11 seconds or less unless abnormally conducted
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