Have you ever had a sudden, blue-eyed, dizzy experience? Perhaps you've had this experience while standing, standing up suddenly, or being in a crowded place. You and your family must have been very scared because you couldn't figure out what was causing this kind of fainting? Today, we're going to talk about a special test that doctors use to find out the exact cause of this. This is called a Hemodynamic Test.
What is a Hemodynamic Test?
Simply put, a hemodynamic test is a test that looks at how your blood is moving through your body, how well your heart is working, and how well your heart is working. This is sometimes called a 'hemodynamic tilt test'. This uses a special camera and a very small amount of radioactive material to get a clear picture of the function of your heart and blood vessels. We call this method `(nuclear imaging)`.
Why is this test being done?
If you frequently faint, doctors will use the information from this test to try to find the cause. We medically call fainting ``syncope.'' The results of this test will determine the best treatment for you.
There are several common reasons why someone might faint:
- Temporary decrease in blood flow to the brain.
- Sudden drop in blood pressure or heart rate.
- Changes in the amount of blood in the body or the way blood is distributed.
Often, people who faint may have a medical condition related to the heart, nervous system, or blood vessels in their brain. So this test can help identify exactly what that condition is.
How do you prepare before the test?
To do well on this test, a little preparation is required on your part. Be a little careful about these things.
| Advice | Description |
|---|---|
| Pregnancy | This test cannot be performed if you are pregnant or breastfeeding, so you may be asked to take a pregnancy test for your own safety. |
| Food and drink | Do not eat or drink anything for four hours before the test. Do not eat anything, such as chewing gum or toffee. If you have to take medication, take it only with a sip of water. |
| Caffeine | Do not drink anything containing caffeine (tea, coffee, cola) on the day of the test. Avoid products labeled “caffeine-free” or “decaffeinated” as they may still contain small amounts of caffeine. |
| If you have diabetes | If you have diabetes, ask for an appointment around 12:30 p.m. That way you can have a light breakfast before 8:30 a.m. Talk to your doctor about this. |
| Other medications | Do not take diuretics or laxatives before the test. Take all other medications as normal. Ask your doctor if any medications you are taking contain caffeine and whether they should be taken on the day of the test. Do not stop taking any medications without your doctor's advice. |
What to expect on test day?
- Clothing: Wear comfortable clothes and shoes. You will be required to wear a hospital gown that covers the waist from the waist up during the test. Therefore, do not wear jewelry (including wedding rings). Do not bring valuables.
- Things to bring: Bring your recent medical test reports, other medical records related to your condition, a list of all medications and supplements you are taking (with the amounts), and a list of any allergies you have.
How long does the test take?
The entire test takes about three hours. So expect to be in the hospital for about three hours. You will need to be awake during the test. The staff will make you as comfortable as possible. The clearest images will be obtained if you remain as still and motionless as possible.
What happens during the test?
This test is a combination of several parts, each of which collects important information about your heart and blood circulation.
| Test method | What is happening? |
|---|---|
| ECG monitoring | Several small, sticky stickers called ``electrodes'' are placed on your chest. These send the electrical activity of your heart to an ``EKG/ECG'' machine. This can monitor your heart rate and pattern throughout the test. |
| Blood pressure measurement | Your blood pressure is measured at various points during the test using a blood pressure cuff that is attached to your arm. |
| Echocardiogram (Echo) scan | Before the test begins, after you have rested for 20 minutes, you will have an echocardiogram (heart scan). This takes detailed pictures of your heart and measures how much blood your heart pumps at a time (cardiac output). This measurement is also taken during the test and compared with the initial measurement. |
| Nuclear Medicine Imaging | This is the most important part. A very small amount of radioactive material called a ``radioactive isotope'' or ``tracer'' is injected through a cannula (IV) placed in your vein. Then, a special camera called a ``gamma camera'' takes pictures of your chest. This camera can detect the radiation emitted by the tracer. These pictures can tell you a lot about how well your heart is working, how fast your blood is moving, and how much blood your heart is pumping. |
How will you feel during the test?
Most of the time, it doesn't feel too bad. However, some people may experience dizziness , nausea, or a rapid heartbeat . This is normal.
The most important thing is to tell the staff immediately about anything you feel during the test, even if it's just a little uncomfortable. The doctor will use both your symptoms and the information from the test to come to a conclusion about your condition.
As the radioactive material passes through the cannula, you may feel a cold sensation running down your arm. You may also experience a metallic taste in your mouth or a strange smell in your nose. These symptoms will go away after a while.
What happens after the test?
After the test is over,
- You will need to stay in the hospital until the discomfort you felt during the test is completely gone.
- Some of the tracer used in the test will be excreted in your urine. The rest will dissolve naturally in your body. If you want, you can speed up this process by drinking a little extra water.
- Most people go straight home after the test, but if you experience severe symptoms (like fainting) during the test, it's a good idea to have someone accompany you.
Are there any risks with this test?
This is a very safe test. The possible minor risks are:
- You may experience bruising, redness, or swelling where the cannula was inserted. This is normal.
- The radioactive material used is not a dye, so it does not cause allergic reactions.
The amount of radiation used in this test is very small. In fact, it's about the same amount of radiation you'd be exposed to during a chest X-ray. So there's no reason to worry about it.
What does the test report say?
The report your doctor receives will tell you whether your results are normal or abnormal. If they are abnormal, it will also explain why. For example:
- Is there an abnormal heart rhythm?
- Are there any changes in blood pressure?
- You can find out if you have a problem like coronary artery disease, where it is located, and how serious it is.
- Is there reduced blood flow to the heart (ischemia)?
- Has there been damage to heart tissue (infarction) due to loss of blood and oxygen?
It usually takes 10 to 14 days to receive this report. Based on these results, your doctor will develop a treatment plan for you. You may need to start new medications or be referred to other specialists.
Take-Home Message
- If you're experiencing frequent dizziness, this is a very important test to find the exact cause. So don't be afraid of this.
- Follow the doctor's instructions carefully before the test, especially regarding food, drink, and medication.
- Tell the staff immediately if you feel any discomfort (such as dizziness or nausea) during the test. This is also important for diagnosis.
- The amount of radiation in this is very low, so don't be unnecessarily afraid of it.
- Once the report arrives, talk to your doctor about it and future treatment, and ask any questions you may have.
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