Final answer:
Atrial fibrillation is characterized by not having any distinct P waves. In atrial fibrillation, the electrical pattern is abnormal prior to the QRS complex, and the frequency between the QRS complexes has increased.
Step-by-step explanation:
Atrial fibrillation is characterized by not having any distinct P waves. In atrial fibrillation, the electrical pattern is abnormal prior to the QRS complex, and the frequency between the QRS complexes has increased. This means that the normal atrial depolarization and repolarization waves, represented by P waves, are not clearly seen.