An echocardiogram is an ultrasound of your heart. A technician presses a small wand against your chest, and sound waves bounce off your heart’s structures to create a moving picture on a screen. The whole process for a standard exam takes about 45 minutes to an hour, is painless, and requires no special preparation. There are a few different types, though, and each one works a bit differently.
How the Sound Waves Create an Image
The handheld wand (called a transducer) contains ceramic crystals that vibrate when electricity passes through them, producing sound waves far above the range of human hearing. Those waves travel into your chest and bounce back when they hit the boundaries between different tissues, like the walls of your heart chambers, your valves, or the blood inside them. The transducer picks up these returning echoes and converts them back into electrical signals. A computer then calculates the distance to each structure based on how long each echo took to return, assembling a two-dimensional, real-time video of your heart beating.
A feature called Doppler ultrasound adds another layer. It measures the speed and direction of blood flowing through your heart and major vessels, often displayed in color on the screen. This lets the technician see whether blood is moving the way it should or leaking backward through a valve.
What Happens During a Standard Echocardiogram
The most common type is a transthoracic echocardiogram, or TTE. You’ll lie down on an exam table, typically on your left side. A technician sticks small adhesive patches to your chest to monitor your heart rate and rhythm throughout the test. Then they apply a clear gel to your skin. The gel feels cool and a bit slippery, but it’s there to eliminate air gaps between the wand and your skin so the sound waves transmit cleanly.
The technician presses the transducer firmly against different spots on your chest and upper abdomen, angling it to capture views of each heart chamber, valve, and the surrounding structures. You may feel moderate pressure, but it shouldn’t be painful. At various points, you’ll be asked to hold still, roll onto your side, or take a deep breath and hold it so the technician can get a clearer image. The entire exam typically runs about 45 minutes.
No fasting, no needles, no sedation. You can eat, drink, and take your usual medications beforehand. Wear a two-piece outfit if you can, since you’ll need to remove clothing from the waist up and put on a hospital gown.
Transesophageal Echocardiogram (TEE)
Sometimes the standard chest-wall approach doesn’t produce clear enough images, particularly when a doctor needs a detailed look at the valves or is checking for blood clots. In those cases, the ultrasound probe goes down your throat instead, positioning it directly behind the heart where there’s no lung or rib in the way.
The preparation is more involved. You’ll need to fast for several hours beforehand. Before the probe is inserted, you gargle with a numbing solution to reduce your gag reflex and the discomfort at the back of your throat. You’ll also receive a sedative through an IV to help you relax. The sedation keeps you conscious but drowsy enough that most people remember very little of the procedure afterward.
The probe is thin and flexible. Once it’s guided into your esophagus, the technician or cardiologist captures images from various angles by gently advancing or rotating it. The imaging portion is relatively quick, but the entire visit, including preparation and recovery from sedation, runs between one and one and a half hours. Because of the sedative, you won’t be able to drive yourself home, so plan for someone to pick you up. Your throat may feel sore or scratchy for a few hours afterward.
Stress Echocardiogram
A stress echo checks how your heart performs under exertion. The technician captures a set of baseline images while your heart is at rest. Then you exercise, usually on a treadmill or a stationary bicycle, pushing your heart rate up to a target level. As soon as you stop, you lie back down quickly and another round of images is taken while your heart is still beating fast. Comparing the two sets reveals whether any parts of the heart muscle aren’t getting enough blood flow during exercise.
If you can’t exercise due to joint problems, mobility issues, or other health conditions, the stress can be induced with medication given through an IV. The drug temporarily increases your heart rate and mimics the effect of physical activity. When medication is used, the test takes slightly longer overall but follows the same imaging logic: rest images first, stress images second. Expect the full appointment to last about an hour.
What the Test Measures
An echocardiogram gives your doctor a surprisingly detailed picture of your heart’s structure and function. The key measurements include:
- Ejection fraction: the percentage of blood your left ventricle pumps out with each beat. A normal range is about 50% to 70%. Between 41% and 49% is considered mildly reduced, and 40% or below is significantly reduced.
- Chamber size: whether any of the four chambers are enlarged, which can signal conditions like heart failure or valve disease.
- Valve function: whether valves open and close properly, or whether blood is leaking backward (regurgitation) or being forced through a narrowed opening (stenosis).
- Wall motion: whether all sections of the heart muscle contract evenly, or whether some areas move weakly, which can indicate damage from a heart attack or reduced blood supply.
- Blood flow patterns: the speed and direction of blood through the chambers and major vessels, measured with Doppler.
Getting Your Results
The images are reviewed and interpreted by a cardiologist, who writes a formal report. In some cases, the person performing the test will discuss preliminary findings with you right away. More often, the report is sent to the doctor who ordered the test, and you’ll hear back at a follow-up appointment or through your patient portal. Turnaround varies by facility, but most results are available within a few days.
The echo itself carries no radiation exposure and has no lasting side effects for the standard transthoracic version. For a TEE, the main considerations are the brief recovery from sedation and mild throat soreness. For a stress echo, you may feel tired or slightly winded from the exercise portion, but that resolves quickly. All three types can be repeated as often as needed without any cumulative risk.