Why is this test performed?
The test is used to evaluate your heart and valve function when you are unable to exercise on a treadmill. The test is also used to determine how well your heart tolerates activity, determine your likelihood of having coronary artery disease and evaluate the effectiveness of your cardiac treatment plan.
Can I eat or drink on the day of the test?
Do not eat or drink anything except water for 4 hours before the test. Avoid caffeinated products (Cola, Mountain Dew, chocolate products, coffee or tea) for 24 hours before the test. Caffeine will interfere with the results of the test. Avoid decaffeinated or caffeine-free products, which contain trace amounts of caffeine. Do not smoke on the day of the test. Nicotine will interfere with the results of your test.
Should I take my medications the day of the test?
Do not take these heart medications for 48 hours before the test.
- Beta blockers (Atenolol, Tenormin)
- Carvedilol (Coreg)
- Metoprolol (Lopressor, Toprol)
- Propranolol (Inderal)
Do not take these heart medications for 24 hours before the test, unless your physician tells you otherwise, or if it is needed to treat chest discomfort:
- Isosorbide Dinitrate (Dilatrate, Isordil, Sorbitrate)
- Isosorbide Mononitrate (Ismo, Imdur, Monoket)
- Nitroglycerin (Minitran, Nitropatches, Nitrostat)
Your physician may also ask you to stop taking other heart medications on the day of your test. Bring your medications with you the day of the test. Since many over-the-counter medications contain caffeine (such as diet pills, No Doz, Excedrin and Anacin), do not take any over-the-counter medication that contains caffeine for 24 hours before the test. Ask your physician, pharmacist or nurse if you have questions about other medications that may contain caffeine.
Guidelines for people with Diabetes
If you take insulin to control your blood sugar, ask your physician what amount of your medication you should take the day of the test. Often, your physician will tell you to take only half of your usual morning dose and to eat a light meal four hours before the test. If you take pills to control your blood sugar, do not take your medication until after the test is complete. Do not take your diabetes medication and skip a meal before the test. If you own a glucose monitor you may bring it with you to check your blood sugar levels before and after your test. If you think your blood sugar is low, tell the lab personnel immediately. Plan to eat and take your diabetes medication following your test.
What should I wear on the day of the test?
You may wear anything you like. Before the test, you will change into a hospital gown. Please do not bring valuables with you the day of the test.
What happens during the test?
Your test will take place in the Echo Lab.
An intravenous line (IV) will be inserted into a vein in your arm, so the dobutamine medication can be delivered directly into your bloodstream. A cardiac sonographer will gently rub 10 small areas on your chest and place electrodes (small, flat, sticky patches) on these areas. The electrodes are attached to an electrocardiograph (EKG) monitor that charts your heart’s electrical activity during the test. The sonographer will perform a resting EKG, measure your resting heart rate and take your blood pressure.
The sonographer will ask you to lie on your left side on an exam table so he or she can perform a resting echocardiogram (also called an “echo”). An echocardiogram is a graphic outline of the heart’s movement created from ultrasound vibrations echoed from the heart’s structures. The sonographer will place a wand (called a transducer) on your chest to view an outline of the heart’s movement. Images will be taken periodically throughout the test.
The nurse will administer the dobutamine medication into the IV while the technician continues to obtain echo images. The medication will cause your heart to react as if you were exercising: your heart rate will rise and you may feel it beating more strongly. It may cause a warm, flushed feeling, and in some cases, a mild headache. At regular intervals, the lab personnel will ask how you are feeling. Please tell them if you feel chest, arm, or jaw pain or discomfort, shortness of breath, dizzy, lightheaded or any other unusual symptoms. The lab personnel will watch for any changes on the EKG monitor that suggest the test should be stopped. The IV will be removed from your arm once the test is completed. Your heart rate should return to normal in about 5 to 10 minutes.
How long does the test take?
The appointment will take about one hour. The actual infusion time is usually about 15 minutes. You should plan to stay in the waiting room for at least 30 minutes after completing the procedure, or until all of the symptoms you experienced have resolved.
How do I get the results of my test?
The results will be sent to your referring physician usually within 48 hours.
May I bring a family member or friend with me?
During the testing portion of the examination you will be brought back to the echo department. Your family or friends will be required to wait in the main lobby during the procedure.