Nuclear Stress Test or Cardiac stress test is checking if cardiac blood supply is shown by intravenous injection of radiographers and imaging equipment. insufficient, and shows the portions of blood flow in the heart that is not smooth or damaged. This check will perform two scans, one at rest (static) and one at exercise (stress state), and compare the differences between the two. The Nuclear Stress Test can be performed alone or in conjunction with other tests, depending on the type of heart disease and predicting the Risk ability, more accurate than the electrocardiogram.
Why do you need a Nuclear Stress Test?
The reasons why doctors recommend a Nuclear Stress Test include:
- If your doctor suspects that you are at risk of cardiovascular disease, such as when you are diagnosed with coronary artery disease.
- Once a heart problem has been diagnosed, a Nuclear Stress Test can also be used to assist in the progression of treatment.
- To help you understand the amount and intensity of exercise your heart can withstand, it can be used to help you choose the right exercise.
- When a general routine examination can not diagnose the cause of symptoms such as chest pain, shortness of breath.
Before the Nuclear Stress Test
- Your doctor will discuss where and when to perform a Nuclear Stress Test
- At least 30 minutes in advance may be required
- Ask your doctor in advance to arrange a 1 or 2 day check-up. It may take 4 hours a day to stay in the hospital and 2 hours a day for 2 days.
- Treadmill or flywheel may be used during the inspection process. We recommend that you prepare sports suits and footwear.
- It may take 4 to 6 hours prior for the inspection.
- Drinks containing caffeine are prohibited 24 hours prior to the examination.
- The medicine list should be provided to your doctor and discuss with your doctor whether there is a need to stop taking the medicine on the day.
- Special attention should be paid to patients with Diabetes and those taking non-prescription drugs.
- There will be space during the inspection process, so you can bring books or other items that pass time.
The danger of Nuclear Stress Test
The conventional Nuclear Stress Test is Technetium-99m-MDP, with approximately 11 Millisieverts, which is about three times the amount of radiation that an individual receives a year. But such a dose is considered safe and does not increase the risk of cancer.
The Nuclear Stress Test is performed by skilled, qualified professionals and is basically safe. The probability of hazards occurring during the inspection is low, but known hazards include:
It may be caused by exercise, but when the exercise stops, this symptom usually disappears and rarely develops fatal. And even if this symptom occurs, it is considered to be of diagnostic value.
Chest pain, dizziness, or other symptoms
People with a serious heart disease may cause symptoms such as cardiac ischemia, even with moderate intensity exercise. Although these symptoms can cause danger and discomfort, it is necessary to induce and reproduce the symptoms through the process of Nuclear Stress Test to confirm that they are actually caused by coronary artery disease, which is the One of the goals.
Although rare, some people may be allergic to contrast agents.
It is also extremely rare, but for people with severe coronary artery blockage, a little exercise can lead to a heart attack. Every 10,000 tests, there is probably only 1 life-threatening condition.
To minimize the risk of serious complications, a Nuclear Stress Test is not suitable for people with the following conditions:
- A person with irreversible improvement of heart failure
- Have a heart attack in the last 2 days
- Angina from time to time
- Poor control of arrhythmia and serious life-threatening phenomena
- Serious heart valve disease
- Infective endocarditis
- Acute aortic dissection
- Deep vein thrombosis
Flow of Nuclear Stress Test
Your doctor or examiner will first ask you about your medical history, as well as your workout habits and intensity on weekdays to choose the amount of exercise that will effectively stimulate your heart’s blood flow. Your doctor will also carefully examine your cardiopulmonary to exclude any abnormalities that may affect your results.
Your nurse or examiner will slowly inject the image into your body by intravenous injections. Usually injected by the arm, you may feel cold and cold formulators slowly flow through the arm’s blood vessels, and after about 20 to 40 minutes, they reach the heart.
The heart cells absorb the imaging agent, and you need to lay down and let your heart be photographed to get a picture of the heart blood flow in group 1, which represents a resting state.
When you start shooting group 2, you will be asked to use a treadmill or flywheel, and a nurse or examiner will monitor your physiological condition with an ECG machine, including blood pressure and breathing. Exercise intensity will slowly increase to your maximum tolerance range, meet a preset time or goal, or when symptoms of moderate to severe chest pain, severe shortness of breath, high or low blood pressure, arrhythmia. A special pattern appears on the electrocardiogram. If you feel uncomfortable during the inspection, you can stop at any time.
For those who are not fit for exercise, your doctor will inject drugs from your vein that increase blood flow to your heart to simulate the effect of exercise on your heart. This drug may cause shortness of breath, redness of the face, and produce a post-exercise reaction, but side effects may have headaches, etc.
When your heart rate reaches a peak and you inject a second dose of developing agent, you’ll lay down and take a second set of images and get an image of your heart’s blood flow in a stressful state. Your doctor will observe if you have any abnormalities during your recovery, such as heartbeat and breathing.
The physician will compare the differences between the two sets of images.
After the Nuclear Stress Test
Unless specifically instructed by the doctor, a normal life can be resumed after the examination is completed.
Drink plenty of water, and the content of the body will naturally drain out of the body.
Consult a physician if you have any questions about cardiac blood flow.
Results of Nuclear Stress Test
Your doctor will explain the results. Possible results include:
- Blood flow is normal and no further examination is required.
- The blood flow is normal at rest, but not enough during exercise. Some of the heart is not adequately replenished, which may indicate an obstruction of one or more arteries, or coronary artery disease.
- Lack of blood flow at rest and exercise means that some of the heart is always ischemic, which you may have serious coronary disease, or have had a previous heart attack.If the developer does not reach some part of the heart, the heart tissue at that site is damaged, possibly due to a previous heart attack.
- If there is insufficient blood flow in the heart, Coronary angiography may be required for a direct observation of the blood vessels of the heart.
- Coronary intervention, such as Angioplasty, coronary scaffolding, or coronary artery may be required if the results indicate severe occlusion of the Coronary artery bypass.
Definitions of normal values may vary depending on laboratories and hospitals. Consult your doctor if you have any concerns.