As the name suggests, Hemo-dynamic test is a test which is used to detect and study the dynamics of the blood flow which in turn is related to the heart and its role in blood circulation. It also helps in determining the oxygen saturation of blood. A hemodynamic test is one of the tests which is performed to determine the main cause of syncope (short term loss of consciousness and posture), as syncope is a condition which is associated with reduced blood pressure, reduced heart rate and changes in blood volume and its distribution to the various parts of the body and specially the brain.
When is a hemodynamic test recommended ?
A hemodynamic test is recommended to check the functioning of the heart and its circulation in the body. It along with other tests like blood pressure monitoring, heart rate monitoring and blood volume testing is used to find the root cause of syncope and other circulation disorders. It also helps the doctor in checking if there is enough oxygen in the body and in the lungs. This test could also be performed in individuals who are recovering from an episode of heart attack.
Where is the hemodynamic test performed ?
A hemodynamic test is performed in a hemodynamic laboratory or in a healthcare setup which is equipped to performed hemodynamic testing.
How do you prepare for a hemodynamic test ?
A hemodynamic test is performed primarily on the advice of your treating doctor or your cardiologist after a complete evaluation of your overall health, past medical history, history of present illness and review of any medications which the patient is advised to take. The test is performed on an outpatient basis and you will be asked to follow certain instructions before the test to avoid any errors. You will be asked to abstain from smoking, alcohol consumption and consumption of caffeine or decaffeinated drinks in any form at-least 2 days before the test. You will also be asked to have a light breakfast 4 hours before the procedure. You will be asked to wear comfortable clothing, preferably a loose and sleeveless t-shirt for the test, or you will be asked to change into hospital gown before the test.
What happens during a hemodynamic test ?
You will be asked to change into a hospital gown before shifting to the lab. An intravenous line will be placed in your arm for delivering medicines, taking blood samples, and injecting the radioisotope for imaging. ECG leads will be placed on your chest to constantly monitor your heart rate during the test. A blood pressure cuff will monitor the blood pressure during the test. The imaging is carried out by a specialized camera called as the gamma camera which placed over your chest. A radioactive isotope Technetium-99m is used to image the heart and the same is injected via the intravenous line. The allergic effects of the same are very minimal and hence the same can be injected three times for a period of about an hour or more to take the images of blood flow. It is advised that you should remain still during the test. Other test to determine the blood volume using an iodine dye can also be performed during the hemodynamic test. The hemodynamic test takes about 2 hours and you can be allowed to go home after the test.
When is a hemodynamic test reported ?
A hemodynamic test is reported depending upon the laboratory or the healthcare facility’s policy. Incase urgent reporting is required, the same can be performed on request.
What are the risks and complications of a hemodynamic test ?
This is a diagnostic test hence the complications are rare, but one could have allergy to the dye used in blood volume estimation. One can experience pain and discomfort due to the intravenous line. Also, this test should not be performed in pregnant women as the radioactive isotope and radiation exposure during the test might harm the fetus. It is always advised that one should understand the risks and benefits of a test in detail before ordering for the same.
Disclaimer: The content provided here is meant for general informational purposes only and hence SHOULD NOT be relied upon as a substitute for sound professional medical advice, care or evaluation by a qualified doctor/physician or other relevantly qualified healthcare provider.
