During times of increased stress, our bodies are designed to do certain things. We also react in predictable ways from a biochemical point of view. One well-known reaction to stress is increased heart rate. To put it differently, heart rate and blood pressure rise, providing your body with the strength it requires to handle the situation causing you stress. Doctors perform stress tests on their patients because it is a perfect method to determine the health and limitations of their hearts.
Even if a heavier load is placed on it, your heart still needs to be healthy enough to perform correctly. Ascertaining that your heart is healthy and normal is the main goal of a stress test, no matter the reason your doctor ordered it. The simple treadmill / exercise stress test is used a lot in medicine, nowadays. Both treadmills and stationary bikes can be used for these tests. During the test, leads are connected to the chest to ascertain what the electrical activity of the heart is. A completely normal and healthy heart will reflect in the ECG – electrocardiogram. An ECG will also show if the heart is having problems keeping up. A cardiac stress test is given mainly because the doctor wants to know what is happening with the heart; whether or not it is healthy. Stress tests can also be performed for other reasons. Determining the right amount of exercise for a patient to perform is another reason stress tests are used. Stress tests are also performed to determine how likely the patient is to suffer from something like a heart attack. Considering that stress tests are utilized to determine how health a heart is, there are good reasons behind a doctor’s decision to have on performed. Simply because a stress test has been ordered in no way implies that the patient should assume the worst.
The degree of reliability of the isotope stress test depends on several important factors.
A particular heart rate must be reached and the image must also be quite clear. If these important factors are satisfied, then this type of stress test can offer a reliable diagnosis in approximately 85% of coronary artery disease cases. A 100% rate of accuracy is impossible because there are so many other variables that play a role. There are a wide range of variables that can affect the accuracy of a diagnosis, including false positives.
Recreating a picture of the operation of the heart during periods of stress is what nuclear stress tests are used for and this is done with the help of radioactive isotopes. Determining if there are any issues with the heart or cardiovascular system is more easily done when the heart is under stress. Obtaining images of the heart at rest is also critical for the doctor. So, these images are recreated with the help of intravenously introduced isotopes. A doctor specializing in cardiology will then look over the results to determine the presence of any issues that could be structural or functional in nature. The image that results from a nuclear stress test is incredibly useful because it creates a big contrast between areas of restricted and normal blood supply.
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