In Atrial Fibrillation, what is typically observed on an EKG?

• A. Regular EKG baseline with defined P waves
• B. Irregular EKG baseline without discrete P waves
• C. Consistent P wave morphology
• D. Normal QRS complexes

Answer: (B)

In Atrial Fibrillation, the characteristic finding on an EKG is an irregular EKG baseline without discrete P waves. This irregularity arises because the atria are not contracting in a coordinated manner, leading to chaotic electrical activity. As a result, P waves are absent, replaced by fibrillatory waves that may be difficult to discern.

The lack of consistent P wave morphology indicates that the electrical impulses in the atria are not originating from a single pacemaker, which is a hallmark of normal sinus rhythm and is reflected in the other options which incorrectly suggest the presence of defined or consistent P waves. Furthermore, the baseline appears irregular due to varying intervals between the QRS complexes, causing a distinct pattern that is different from the regularity seen in normal atrial rhythms. Thus, the observation of an irregular baseline without discrete P waves is crucial in identifying Atrial Fibrillation on an EKG.