on the heart: When administered intravenously,
adenosine causes transient heart block in the AV node
of the heart.
In individuals suspected of suffering from a Supra Ventricular
Tachycardia (SVT), adenosine is used to help identify
the rhythm. Certain SVTs can be successfully terminated
with adenosine. This includes any reentrant arrhythmia
that requires the AV node for the re-entry [e.g., AV
Reentrant Tachycardia (AVRT), AV Nodal Reentrant Tachycardia
In addition, atrial tachycardia can sometimes be terminated
with adenosine. The pharmacological effects of adenosine
are blunted in individuals who are taking methylxanthines
e.g. caffeine (found in coffee) and theophylline (found
predominantly in tea).