Перфузия миокарда при помощи SPECT – тест, which uses a low dose radioactive agent for assessing cardiac function and blood flow. Because blood flow to the heart is measured by increasing the activity of the heart, This test is usually carried out with the help of physical exertion. If you can not do the exercises, the doctor may use a drug, which increases the activity of the heart, thus simulating exercises.
Cardiac stress test is used to find the previous damage to the heart and the risk of future damage.
The specific reasons for this test include:
Complications may include:
During testing, the technical staff will closely watch for any signs of problems with the heart or lungs. They will be ready to take action, if complications arise.
Prior to testing, tell your doctor, if you have the disease, which restrict the exercise. If you can not do the exercises, your doctor may prescribe medication, to simulate the load. Tell your doctor, if you have following diseases:
For 24-48 hours before the test, do not eat or drink foods and do not take drugs, following:
Read the labels and consult your doctor or pharmacist, For more information about the product, which you should avoid before the test.
You may be asked not to eat or drink for 4-8 hours before the test.
Wear loose clothing and low-heeled shoes with rubber soles or tennis shoes.
If you smoke, you must refrain from smoking for 1-2 days, or, least, Four hours before testing.
Tell your doctor, if you:
The test basically consists of two parts. The first part of the test is used to check the heart at rest.
Вторая часть теста под названием “стресс” исследует сердце после упражнений или после приема препарата, which mimics the effect of exercise. The doctor will compare the activity of the heart during exercise and at rest to assess his health.
On the one hand is superimposed cuff blood pressure. An intravenous catheter is inserted into a vein in the other arm. Small, Round site (электроды ЭКГ) are placed on the chest and connected to the electrocardiograph. This will allow the doctor to monitor your heart rhythm. Blood pressure and heart rate monitored before, during and after exercise.
The doctor or nurse injected into the bloodstream small amount of radioactive material. The radioactivity of these materials is very small. Radioactive isotopes accumulate in those parts of the heart, that have the best blood flow, and emit signals, which can be detected using a special camera. In pictures, obtained by the camera, see all parts of the heart, who do not get enough blood. Pictures are taken at rest and during exercise.
Exercise or "stress" part of the test is usually performed on a treadmill. You will begin to walk slowly on a treadmill. Every three minutes the speed gradually increases. When you do the exercises, your heart rate and blood pressure changes. At the peak load in the vein further injected a radioactive substance, and the load continues for a minute or two.
After 15-30 минут после “стресса” вы будете помещены на специальный стол, which will take pictures of the heart.
If you are unable for any reason vyplnyat exercises, the doctor may use a drug, which mimics the effect of exercise on the heart. If you notice any changes, or feel, that any side effects, tell your doctor, which oversees testing.
Если вы болеете ишемической болезнью сердца, вы можете почувствовать боль в груди или стенокардию во время части теста. A specialist will be nearby and may give you medication to reduce the symptoms or stop the test early on. Tell your doctor, If you have any symptoms of jaw pain, neck, arm or chest.
You will be able to go home.
If you get medication, which strengthens the heart, у вас могут возникнуть симптомы тревоги, dizziness, nausea, tremor, or shortness of breath. Tell your doctor, if you have any of these symptoms. There is a possibility, that the effect of the drug can last up to 24 hours after the test.
The entire test takes 3-5 hours. You can execute the entire test in one day, or testing can be divided into several days.
Usually, this test should not be painful. If you have received medication, то можете чувствовать некоторый дискомфорт – покраснение, pressure in the chest, pain or shortness of breath.
The doctor will compare the images of the heart, made dormant, with the image of the heart during stress. If your heart is relatively healthy, there should be no difference between the images (or very small differences), made during stress, and images at rest. If the heart arteries are partially blocked, photos, taken during stress will be different from the pictures alone.
After testing, visit the doctor, If the following symptoms:
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