What rhythm is characterized by a rate falling above 100 with absent or inverted P waves?

The rhythm characterized by a rate exceeding 100 beats per minute with absent or inverted P waves is Junctional Tachycardia. This condition typically arises from the junctional tissue of the heart, which is situated at the point where the atria and ventricles meet, often leading to the loss of the typical P wave that represents atrial depolarization in a normal cardiac cycle.

In Junctional Tachycardia, electrical impulses are generated from the junctional area rather than the atria. As a result, any atrial depolarization that may occur may not be captured as a distinct P wave, leading to either absent waves or inverted waves if they occur. The high heart rate, generally above 100 beats per minute, distinguishes it from slower rhythms, emphasizing the tachycardic nature of this condition.

Other rhythms mentioned, like Atrial Fibrillation and Supraventricular Tachycardia, can present with fast rates and irregular rhythms but typically exhibit different waveform characteristics, particularly with regards to the P waves. Ventricular Tachycardia, while also a rapid rhythm, originates from the ventricles and is associated with significantly more severe clinical implications and distinct ECG findings. This understanding of the specific characteristics of Junctional