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how does caffeine affect the results of thallium myocardial perfusion scan

A 50-year-old member asked:
Dr. Samuel Hahn
28 years experience Cardiology
Not usually: Caffeine in the usual dietary dose won't affect an exercise stress test with thallium imaging, but if you ingest caffeine recently you cannot have a s ... Read More
Dr. Thomas Heston
29 years experience Family Medicine
Sometimes not at all: Caffeine can interfere with the pharmacologic stress test used in conjunction with thallium myocardial perfusion scanning. It blocks the effect of the ... Read More
Dr. Thomas Heston
29 years experience Family Medicine
False-negative: Caffeine can interfere with vasodilator pharmacologic stress testing, so your thallium myocardial perfusion scan might be normal even though you have ... Read More

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A 41-year-old member asked:
Dr. Louis Grenzer
55 years experience Cardiology
18 mSv: For comparison, a chest x-ray is 0.02 msv and and abdominal ct scan would be 10 msv. So the thallium scan is like getting almost a thousand one view c ... Read More
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Dr. Thomas Heston
29 years experience Family Medicine
Depends on dose: It depends on the dose but a rough estimate would be 15 to 20 msv.
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Dr. Raymond Taillefer
42 years experience Nuclear Medicine
10-20 mSv approx.: The thallium-201 dose administered varies from one patient to another according to the patient's weight. The radiation from a standard dose varies fro ... Read More
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A 41-year-old member asked:
Dr. Shahin Tavackoli
23 years experience Cardiology
Caffeine: You should avoid caffeine and beta blockers, just because they interfere with the test.
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Dr. Thomas Heston
29 years experience Family Medicine
Caffeine: As the clinic for specific details, but in general no caffeine for 24 to 48 hours, no blood pressure medications for 24 hours, and no nitrates for 24 ... Read More
Dr. Raymond Taillefer
42 years experience Nuclear Medicine
Coffe tea chocolate: If you have a pharmacological stress test such as adenosine, Dipyridamole or lexiscan, you should avoid coffee, chocolate, tea, "brown" colas and amin ... Read More
A 32-year-old member asked:
Dr. Mark Stern
46 years experience Cardiology
It is never safe to : Although it is no more risky to smoke after a scan, it is never safe to smoke.
A 33-year-old member asked:
Dr. Mark Stern
46 years experience Cardiology
Sometimes: Yes in some centers they are read the same day, but most take longer.
A 35-year-old member asked:
Dr. Mark Stern
46 years experience Cardiology
No: No because the blood flow to stomach increased and it makes the image less accurate.
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A 33-year-old member asked:
Dr. Mark Stern
46 years experience Cardiology
Yes: Yes.
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A 28-year-old male asked:
Dr. Joshua Buckler
19 years experience Cardiology
Stress test: This is a type of stress test which uses exercise to increase the heart rate and stress the heart and then a tracer molecule is injected into an IV wh ... Read More
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A 45-year-old female asked:
Dr. Brian Wosnitzer
18 years experience Nuclear Medicine
Radiation...: Depending on what radiotracer is used, you will be exposed to a small amount of radiation but the benefits of the test should outweigh the risks. Are ... Read More
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2 thanks

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