A 53-year-old member asked:
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Nuclear cardiology stress test--how much radiaiton?

1 doctor answer
Dr. Michael Zevitz
36 years experience in Internal medicine
None: Tbere is no radiation exposure on a nuclear cardiology stress test. The tracer chemical is a harmless radioisotope, usually technitium, but sometimes thallium, which is entirely eliminated from the body within 24 hours after it is injected. The radioisotope is simply used as a tracer to assess the blood circulation to the heart muscle regions.
Answered on Dec 1, 2012
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3 comments
Dr. Tim McDonough
47 years experience in Cardiology
Radiation exposure is commonly measured in millisieverts (mSv). The average person in the U.S. can expect to receive no more than 3 mSv of exposure per year from naturally occurring background radiation. An exposure of greater than 20 mSv is considered high, while greater than 3 mSv to 20 mSv is considered moderate. Myocardial perfusion imaging for heart disease delivers about 15 mSv per test.
Apr 3, 2012
Dr. Tim McDonough
47 years experience in Cardiology
previous statement from WebMD
Apr 3, 2012
Dr. Thomas Heston
28 years experience in Family Medicine
Newer protocols have reduced the radiation exposure to around 10 mSv (using Tc99m tetrofosmin) down to about 5 mSv (stress-only or with some solid-state cameras) and even down to 2 mSv (PET-only imaging with N-13 ammonia).
Dec 1, 2012

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