Which rhythm strip is indicative of atrial fibrillation?

Atrial fibrillation is characterized by chaotic and irregular heartbeats, which is a hallmark of the condition. In this rhythm, the electrical signals in the atria are disorganized, leading to a lack of coordination in the contraction of atrial muscles. This results in an irregularly timed heartbeat, often felt as palpitations, and can be reflected in the rhythm strip as an unpredictable R-R interval. The lack of distinct P waves is another key feature, as the chaotic activity in the atria prevents the formation of regular P waves that are seen in normal sinus rhythm. Thus, the chaotic and irregular pattern on the rhythm strip is indicative of atrial fibrillation.

In contrast, options describing regular R-R intervals, identical P waves, and a consistent heart rate would suggest a different type of rhythm, likely sinus rhythm or some other arrhythmia, rather than atrial fibrillation.