The "beauty" of Adenosine - it works quickly! The drug's onset of action is within seconds after rapid IV administration - with a half-life of less than 10 seconds (this being the reason Adenosine needs to be given IV push as fast as possible).

• Adenosine is highly effective for reentry SVT rhythms (AVNRT/PSVT) - with a successful conversion rate of over 90%. Brief review regarding specifics about Adenosine dosing can be found by CLICKING HERE.
• It is important to be aware that on the way from tachycardia-to-conversion-to-sinus-rhythm - there may be side effects (transient extreme bradycardia or frequent ectopics including short runs of VT as seen here). The advantage of Adenosine's short half-life is that adverse effects rarely last more than a minute or so. Some providers choose to look the other way for 30-40 seconds after Adenosine is given. While not advising you to do this - Awareness of the transient nature of Adenosine's effect is at least reassuring that arrhythmias arising as a result of treatment are likely to be short-lived.
• After it is all over - We can admire the interesting array of fusion beats in the middle rhythm strip at the onset of runs of nonsustained VT.