Today, you get THREE strips for your basic classes! The first shows a PSVT - paroxysmal supraventricular tachycardia at a rate of about 220/minute. The QRS complexes are narrow, and the rhythm is regular. In the second strip, we see the moment of conversion after a dose of 6 mg. of adenosine was administered by rapid I.V. infusion. The re-entry cycle is broken, and the patient experiences many PVCs, including groups of two, three, and even four in a row. Soon, however, the rhythm settles into sinus rhythm with PACs, and later, just sinus rhythm (not shown).