What is the characteristic of a PSVT rhythm?

A characteristic of Paroxysmal Supraventricular Tachycardia (PSVT) is that it occurs suddenly and ends suddenly. This feature is essential for identifying the rhythm, as PSVT typically begins and resolves abruptly, making it distinct from other forms of tachycardia that may have a more gradual onset or offset. This sudden onset can often be triggered by certain activities or stimulants, and it might resolve spontaneously without intervention.

In contrast, a constantly elevated heart rate above 100 BPM characterizes other types of tachycardia but does not capture the distinctive sudden nature of PSVT. A consistently irregular rhythm is more indicative of atrial fibrillation or other irregular rhythms, while minimal variation in heart rate is typically observed in more stable rhythms rather than the dynamic changes seen in PSVT. Understanding these distinctions is crucial for accurately recognizing and responding to PSVT in clinical settings.