... reported preliminary findings using technetium-99m sestamibi, showing that nuclear stress testing is effective in predicting subsequent events and determining a need for catheterization in the post-bypass ... receptor binding, causing vascular vasodilatation. Methyl- xanthines, such as theophylline or caffeine, block adenosine binding to A1 and A2 receptors, antago- nizing the effects of adenosine or ... Department of Nuclear Medicine, Montefiore Medi- cal Center, Albert Einstein College of Medicine, Bronx, NY. Address reprint requests to Mark L Travin, MD, Department of Nuclear Medicine, Montefiore...