Displaying 1 results of Regadenoson Stable Isotopes Regadenoson Stable Isotopes refer to the non-radioactive isotopes of the drug Regadenoson, which is commonly used as a stress agent in myocardial perfusion imaging. These stable isotopes are chemically identical to the radioactive isotopes used in imaging, but without the harmful effects of radiation. They are useful in research studies and drug development where radioactive isotopes are not preferred or allowed.