1. When appointed?
2. How to prepare?
myocardial scintigraphy - a nuclear medical examination of the heart muscle, which is currently very popular.This procedure is based on the intravenous administration of radioactive substances in the human body, the gamma radiation is recorded by a scintillation counter.This study is to determine the functional changes in the heart muscle.Myocardial scintigraphy determines the degree of blood circulation failure, and gives detailed information on the state of the coronary vessels.
The above procedure is performed, and at rest, and with the load.In the study at rest radioactive technetium is injected intravenously.It is connected with the drug is distributed in the myocardium.The radioactive substance accumulates, usually in a part of the heart where there is an active metabolism (metabolism).After administration of technetium immediately begins radiation, which is registered gamma camera.All images are played back on
myocardial scintigraphy with the load is carried out after the study alone (after a certain period of time, sufficient for the radionuclide decay).The radioactive drug is injected a medical specialist at the peak of physical activity, which is determined by heart rate, according to the formula - 200-age.As for the load dosing, then it is carried out on a bicycle equipped with a pressure controller and pulse.
If scintigram, which was performed at rest, found to be defective, then the first thing you need to find out whether it is a sign of insufficient blood supply to the zone or post-infarction scar tissue.In this case, two days later (this time is enough for the decay of a radionuclide) is repeated myocardial scintigraphy with stress.The latter procedure helps to accurately diagnose the defect, which was captured earlier.
myocardial scintigraphy is a safe examination, as the impact of radiation is the minimum.However, this procedure can not identify:
Considering all the above, this method of diagnosis is desirable combined with computed tomography of the heart with the use of contrast.
main indications for myocardial scintigraphy are:
Before this study should be released from the liver of the radiopharmaceutical, so the study does not begin earlier than 45-60 minutes after entering the drug.At the same time, necessary to prevent the radiopharmaceutical from the stomach to the duodenum, so fasting scintigraphy of myocardium is performed.
If the patient myocardial scintigraphy was appointed to the load, the day before the study the patient must give up all caffeine-containing medications and foods.
myocardial scintigraphy can not be performed in the following cases:
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