What is characterized by greater than 100 heart rate and at least 3 different morphologies of P waves?

The condition characterized by a heart rate greater than 100 beats per minute along with at least three different morphologies of P waves is Multifocal Atrial Tachycardia. In this arrhythmia, multiple ectopic foci in the atria fire, leading to the production of different P wave shapes. The variability in P wave morphology indicates that the electrical activity is originating from multiple sites in the atria rather than a single source.

This condition is often associated with underlying pulmonary diseases, such as chronic obstructive pulmonary disease (COPD), and can present with a rapid heart rate. The presence of at least three distinct P wave forms helps differentiate Multifocal Atrial Tachycardia from similar arrhythmias, such as Wandering Atrial Pacemaker, where the heart rate is typically less than 100 beats per minute, and while there may be variability in P waves, the rate does not reach the tachycardic level.

Understanding the distinguishing characteristics of these different forms of atrial activity is crucial for accurate diagnosis and treatment.