“Rhythm is sound in motion. It is related to the pulse, the heartbeat, the way we breathe. It rises and falls. It takes us into ourselves; it takes us out of ourselves.” —Edward Hirsh Rhythm. It is ...

Narrow-complex tachyarrhythmias are rapid heart rhythms originating in the upper heart chambers, characterized by a QRS duration of less than 120 milliseconds on an EKG. These arrhythmias can be ...