AVRT on the 12-lead, and how the WPW pattern becomes it

The tachycardia of a person with an accessory pathway: regular, narrow and fast, with no delta wave and a retrograde P on the ST segment. Switch to the Onset form and turn on Study to watch one premature atrial beat turn the WPW pattern into the tachycardia, step by step. A person with the pattern and a tachycardia has WPW syndrome.