What is a common feature of regular narrow-complex tachycardia on an EKG?

A common feature of regular narrow-complex tachycardia on an EKG is typically a high heart rate, which can indeed reach rates of around 180 beats per minute. Regular narrow-complex tachycardia generally refers to specific arrhythmias that result in a rapid heartbeat with QRS complexes that are narrow (less than 120 milliseconds), indicating that the ventricular activation is occurring normally, through the His-Purkinje system.

In these situations, the predominant characteristic is the consistent and elevated heart rate, which is a hallmark for conditions like atrial flutter with a rapid ventricular response, paroxysmal supraventricular tachycardia (SVT), or atrioventricular reentrant tachycardia (AVRT). Thus, recognizing a heart rate around 180 beats/min assists in differentiating these rhythms from other types of tachycardia or irregular rhythms, making it a significant feature when interpreting EKG readings.

While clear atrial activity may sometimes be present, it is not a defining characteristic of all forms of regular narrow-complex tachycardias, as some can obscure this activity. An irregular rhythm would indicate a different type of tachycardia, such as atrial fibrillation,