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  1. To test the impact of an atomic blast on populated areas, technicians built entire fake towns, with houses, shops, and even mannequin families. These settlem...

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    • Overview
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    A nuclear stress test uses a small amount of radioactive material (tracer) and an imaging machine to create pictures showing the blood flow to your heart. The test measures blood flow while you are at rest and during activity, showing areas with poor blood flow or damage in your heart. A nuclear stress test is one of several types of stress tests. The radiotracer used during a nuclear stress test helps your doctor determine your risk of a heart attack or other cardiac event if you have coronary artery disease. A nuclear stress test may be done after a regular exercise stress test to get more information about your heart, or it may be the first stress test used. The test is done using a positron emission technology (PET) scanner or single photo emission computed tomography (SPECT) scanner. A nuclear stress test may also be called a myocardial perfusion imaging (MPI) study, cardiac PET study or cardiac SPECTstudy.

    You may need a nuclear stress test if you have signs or symptoms of heart disease such as chest pain or shortness of breath. A nuclear stress test may also be used to guide your treatment if you've been diagnosed with a heart condition. Your doctor may recommend a nuclear stress test to: 1. Diagnose coronary artery disease. Your coronary arteries are the major blood vessels that supply your heart with blood, oxygen and nutrients. Coronary artery disease develops when these arteries become damaged or diseased — usually due to a buildup of deposits containing cholesterol and other substances (plaques). If you have symptoms such as chest pain or shortness of breath, a nuclear stress test can help determine if you have coronary artery disease and how severe the condition is. 2. Determine a treatment plan.If you have coronary artery disease, a nuclear stress test can tell your doctor how well treatment is working. The test also helps your doctor develop the right treatment for you by det...

    A nuclear stress test is generally safe. Complications are rare. As with any medical procedure, there is a risk of complications, which may include: 1. Abnormal heart rhythms (arrhythmias).Arrhythmias that occur during a stress test usually go away shortly after you stop exercising or the medication wears off. Life-threatening arrhythmias are rare. 2. Heart attack.Although extremely rare, it's possible that a nuclear stress test could cause a heart attack. 3. Low blood pressure.Blood pressure may drop during or immediately after exercise, possibly causing you to feel dizzy or faint. The problem should go away after you stop exercising. 4. Dizziness or chest pain.These symptoms can occur during a nuclear stress test. Some people also have nausea, shakiness, headache, flushing, shortness of breath and anxiety during the stress test. These signs and symptoms are usually mild and brief, but tell your doctor if they occur.

    A nuclear stress test involves injecting a radioactive tracer, then taking two sets of images of your heart — one while you're at rest and another after exercise. A nuclear stress test is done along with an exercise stress test, in which you walk on a treadmill. If you aren't able to exercise, you'll receive a drug through an IV that mimics exercise by increasing blood flow to your heart. A nuclear stress test can take two or more hours, depending on the radioactive tracer and imaging tests used.

    Your doctor will discuss your nuclear stress test results with you. Your results could show: 1. Normal blood flow during exercise and rest.You may not need further tests. 2. Normal blood flow during rest, but not during exercise.Part of your heart isn't receiving enough blood when you're exerting yourself. This might mean that you have one or more blocked arteries (coronary artery disease). 3. Low blood flow during rest and exercise.Part of your heart isn't getting enough blood at all times, which could be due to severe coronary artery disease or a previous heart attack. 4. Lack of blood flow in parts of your heart.Areas of your heart that don't show the radioactive tracer have damage from a heart attack. If you don't have enough blood flow through your heart, you may need to have coronary angiography. This test looks directly at the blood vessels supplying your heart. If you have severe blockages, you may need an angioplasty and stent placement or open-heart surgery (coronary arter...

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