How does caffeine affect the results of thallium myocardial perfusion scan?

False-negative. Caffeine can interfere with vasodilator pharmacologic stress testing, so your thallium myocardial perfusion scan might be normal even though you have cardiac perfusion problems. Best to hold caffeine for 48 hours prior to the test. You don't always know ahead of time whether an exercise stress test will work, so it is recommended that everyone hold caffeine for a couple of days prior to the study.
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 stress agent (e.g. Dipyridamole) which makes the thallium stress-rest perfusion scan less accurate. If you perform exercise stress and achieve your target heart rate, caffeine shouldn't affect the scan much if at all.
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 stress test with pharmacologic stress using Persantine (dipyridamole), Adenosine or Lexiscan because the caffeine interferes with the metabolism of those agents.

Related Questions

Is it safe to smoke after a myocardial perfusion scan thallium scan cardiac nuclear imaging?

It is never safe to . Although it is no more risky to smoke after a scan, it is never safe to smoke. Read more...
No. It is never "safe" to smoke! but there is no particularly increased risk due to the thallium perfusion scan. So go ahead and smoke but take serious measures to stop, soon. Read more...
Well... Since you had a cardiac nuclear scan, I assume your doctors were looking for coronary artery disease. You seem to be a smoker, which makes artery disease worse. So smoking is not a good thing for you, and you should try to stop. Having said that, you are probably not in any more immediate risk for heart problem for smoking after the nuclear exam. Long term risks are greater with smoking. Read more...

Can I eat food before having myocardial perfusion scan?

No. No because the blood flow to stomach increased and it makes the image less accurate. Read more...
Yes. In general, a light meal is ok but a heavy meal is not recommended. Check with the clinic where you are going to have the test to get their recommendations. Read more...

Can someone drive home after a myocardial perfusion scan?

Yes. You can drive home unless you are administered a medication for relaxation during the test as is sometimes necessary for people with severe claustrophobia. However, this is very, very rare because nuclear cameras are so open. Nearly 100% of the people who get a myocardial perfusion scan can drive home safely after the test. Read more...
Yes. No sedatives or anesthesia is used for myocardial scans. Isotopes that selectively go to heart muscle are used. These radio pharmaceuticals do not have any effect that would prevent driving home. If test includes physical stress, patient will recover to normal state before leaving department. Cardiologist is continually monitoring heart beat, blood pressure, etc. Read more...

What is the definition or description of: myocardial perfusion scan with exercise?

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 which shows normal and abnormal blood flow in the heart. This is compared to images at rest to determine whether there has been a heart attack or if there are concerning blockages of the coronary arteries. Read more...
Cardiac blood supply. A cardiac perfusion scan measures the amount of blood supplied to your heart muscle. Radiotracers such as thallium or technetium sestamibi are injected intravenously and travel through blood to heart muscle. Two sets of images are made during rest and exercise are compared. Indications for this study include chest pain, previous heart attack, heart surgery and coronary artery disease. Read more...
MIBI, Thallium scan. Myocardial perfusion study refers to the use of radionuclide to evaluate the degree of blood flow (also called perfusion)in the arteries of the heart (coronaries). The injection of the radiotracer ( 3 different ones : mibi. Myoview, or thallium) is performed at rest, at peak stress ( treadmill) or after pharmacological intervention to help detecting coronary artery disease. Read more...
Cardiac Exam. Myocardial perfusion imaging looks at blood flow to the left ventricle. This is primarily accomplished using nuclear techniques such as pet or spect using radiotracers such as tl-201, tc-99m, or n-13 ammonia. When it is done with exercise, the myocardial perfusion scan shows blood flow during exercise, and usually compares that to perfusion at rest in order to evaluate for inducible ischemia. Read more...

Are there any medical complications from myocardial perfusion scan that would cause coughing?

No. The scan itself should not cause a cough. However, you may experience a cough after performance of a stress treadmill test (due to exercise induced asthma) or performance of pharmacologic stress (due to dilation of pulmonary vessels). Read more...