Which radioactive isotopes are used in a nuclear stress test?


Some cardiologists prefer to use thallium-201, while others use technetium-99m, which is also known as Cardiolite (technetium-99m sestamibi) or Myoview (technetium-99m tetrofosmin). Still others use both radioisotopes in what is known as a dual-injection protocol.


These radioisotopes have different properties from one another, but they all travel to your heart in proportion to the amount of blood flow. Therefore, the nuclear camera will detect more radioactivity in areas of the heart that have good blood flow and less radioactivity in areas that are being deprived of blood and oxygen because of a clogged coronary artery.

Continue Learning about Heart and Circulatory System

Heart and Circulatory System

Heart and Circulatory System

Your circulatory system is made up of your heart and three main types of blood vessels -- arteries, veins and capillaries. Your heart is at the center of the system, acting as a pump to distribute nutrient- and oxygen-rich blood t...

hrough your body; it then takes away carbon dioxide and other waste your body doesn't need. Signs of poor circulation include cold hands and feet, numbness, dizziness, migraines, varicose veins and pain in your feet or legs. Untreated, poor circulation can lead to stroke, high blood pressure, kidney damage and other diseases. Learn more about your heart and circulatory system with expert advice from Sharecare.

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.