What rhythm is characterized by an irregular pattern and different P wave morphologies where the heart rate is typically between 60 and 100 bpm?

Wandering Atrial Pacemaker is characterized by an irregular rhythm where the P waves can appear with different morphologies due to the activation of different atrial foci. In this rhythm, the heart rate typically ranges from 60 to 100 beats per minute, reflecting the inherent automaticity of the atrial pacemakers that are taking turns to fire. This contributes to the irregularity seen in the rhythm, which distinguishes it from other types of arrhythmias.

In Wandering Atrial Pacemaker, it's common to see several distinct P wave shapes on the electrocardiogram (ECG), indicating that impulses are originating from different locations within the atria. This is in contrast to Atrial Fibrillation, where P waves are absent, and the rhythm is chaotic due to disorganized electrical activity. Furthermore, the other options, such as 2nd Degree AV Block and 3rd Degree AV Block, primarily involve issues with the conduction pathway between the atria and ventricles, leading to regular or irregular patterns that do not present with varying P wave morphologies or the specified heart rate range.