What is the cardiac rhythm depicted on the following electrocardiogram?
a. Atrial fibrillation c. Paroxysmal atrial tachycardia
b. Premature atrial beats d. Premature ventricu-lar contractions
ANS: A
Atrial fibrillation is characterized by gross irregularities in both atrial and ventricular depolariza-tion. The P waves have been replaced by fibrillatory waves, which have caused an undulation of the baseline. Not every atrial depolarization has been transmitted by the atrioventricular node.
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