Echocardiogram/Echocardiography

Jai Ganesh · 2025-02-06 17:04:26

Echocardiogram/Echocardiography

Gist

An echocardiogram is an ultrasound test that checks the structure and function of your heart. An echo can diagnose a range of conditions including cardiomyopathy and valve disease. There are several types of echo tests, including transthoracic and transesophageal.

The test is often used to check for leaky heart valves. It can help diagnose valve disease such as heart valve regurgitation and valve stenosis. Heart problems present at birth, called congenital heart defects. An echocardiogram can show changes in the structure of the heart and heart valves.

Summary

An echocardiogram is an ultrasound test that checks the structure and function of your heart. An echo can diagnose a range of conditions including cardiomyopathy and valve disease. There are several types of echo tests, including transthoracic and transesophageal. Talk with your provider about the type that’s best for you.

Overview

What is an echocardiogram?:

An echocardiogram (echo) is a graphic outline of your heart’s movement. During an echo test, your healthcare provider uses ultrasound (high-frequency sound waves) from a hand-held wand placed on your chest to take pictures of your heart’s valves and chambers. This helps the provider evaluate the pumping action of your heart.

Providers often combine echo with Doppler ultrasound and color Doppler techniques to evaluate blood flow across your heart’s valves.

Echocardiography uses no radiation. This makes an echo different from other tests like X-rays and CT scans that use small amounts of radiation.

Who performs an echo test?

A technician called a cardiac sonographer performs your echo. They’re trained in performing echo tests and using the most current technology. They’re prepared to work in a variety of settings including hospital rooms and catheterization labs.

What are the different types of echocardiogram?

There are several types of echocardiogram. Each one offers unique benefits in diagnosing and managing heart disease. They include:

* Transthoracic echocardiogram.
* Transesophageal echocardiogram.
* Exercise stress echocardiogram.

What techniques are used in echocardiography?

Several techniques can be used to create pictures of your heart. The best technique depends on your specific condition and what your provider needs to see. These techniques include:

* Two-dimensional (2D) ultrasound. This approach is used most often. It produces 2D images that appear as “slices” on the computer screen. Traditionally, these slices could be “stacked” to build a 3D structure.
* Three-dimensional (3D) ultrasound. Advances in technology have made 3D imaging more efficient and useful. New 3D techniques show different aspects of your heart, including how well it pumps blood, with greater accuracy. Using 3D also allows your sonographer to see parts of your heart from different angles.
* Doppler ultrasound. This technique shows how fast your blood flows, and also in what direction.
* Color Doppler ultrasound. This technique also shows your blood flow, but it uses different colors to highlight the different directions of flow.
* Strain imaging. This approach shows changes in how your heart muscle moves. It can catch early signs of some heart disease.
* Contrast imaging. Your provider injects a substance called a contrast agent into one of your veins. The substance is visible in the images and can help show details of your heart. Some people experience an allergic reaction to the contrast agent, but reactions are usually mild.

How long does an echocardiogram take?

An echocardiogram usually takes 40 to 60 minutes. A transesophageal echo may take up to 90 minutes.

What is an echocardiogram vs. an EKG?

An echocardiogram and an electrocardiogram (called an EKG or ECG) both check your heart. But they check for different things and produce different types of visuals.

An echo checks the overall structure and function of your heart. It produces moving pictures of your heart.

An EKG checks your heart’s electrical activity. It produces a graph, rather than pictures of your heart. The lines on this graph show your heart rate and rhythm.

When would I need an echocardiogram?

Your provider will order an echo for many reasons. You may need an echocardiogram if:

* You have symptoms, and your healthcare provider wants to learn more (either by diagnosing a problem or ruling out possible causes).
* Your provider thinks you have some form of heart disease. The echo is used to diagnose the specific problem and learn more about it.
* Your provider wants to check on a condition you’ve already been diagnosed with. For example, some people with valve disease need echo tests on a regular basis.
* You’re preparing for a surgery or procedure.
* Your provider wants to check the outcome of a surgery or procedure.

What does an echocardiogram show?

An echocardiogram can detect many different types of heart disease. These include:

* Congenital heart disease, which you’re born with.
* Cardiomyopathy, which affects your heart muscle.
* Infective endocarditis, which is an infection in your heart’s chambers or valves.
* Pericardial disease, which affects the two-layered sac that covers the outer surface of your heart.
* Valve disease, which affects the “doors” that connect the chambers of your heart.

An echo can also show changes in your heart that could indicate:

* Aortic aneurysm.
* Blood clots.
* A cardiac tumor.

Details

Echocardiography, also known as cardiac ultrasound, is the use of ultrasound to examine the heart. It is a type of medical imaging, using standard ultrasound or Doppler ultrasound. The visual image formed using this technique is called an echocardiogram, a cardiac echo, or simply an echo.

Echocardiography is routinely used in the diagnosis, management, and follow-up of patients with any suspected or known heart diseases. It is one of the most widely used diagnostic imaging modalities in cardiology. It can provide a wealth of helpful information, including the size and shape of the heart (internal chamber size quantification), pumping capacity, location and extent of any tissue damage, and assessment of valves. An echocardiogram can also give physicians other estimates of heart function, such as a calculation of the cardiac output, ejection fraction, and diastolic function (how well the heart relaxes).

Echocardiography is an important tool in assessing wall motion abnormality in patients with suspected cardiac disease. It is a tool which helps in reaching an early diagnosis of myocardial infarction, showing regional wall motion abnormality. Also, it is important in treatment and follow-up in patients with heart failure, by assessing ejection fraction.

Echocardiography can help detect cardiomyopathies, such as hypertrophic cardiomyopathy, and dilated cardiomyopathy. The use of stress echocardiography may also help determine whether any chest pain or associated symptoms are related to heart disease.

The most important advantages of echocardiography are that it is not invasive (does not involve breaking the skin or entering body cavities) and has no known risks or side effects.

Not only can an echocardiogram create ultrasound images of heart structures, but it can also produce accurate assessment of the blood flowing through the heart by Doppler echocardiography, using pulsed- or continuous-wave Doppler ultrasound. This allows assessment of both normal and abnormal blood flow through the heart. Color Doppler, as well as spectral Doppler, is used to visualize any abnormal communications between the left and right sides of the heart, as well as any leaking of blood through the valves (valvular regurgitation), and can also estimate how well the valves open (or do not open in the case of valvular stenosis). The Doppler technique can also be used for tissue motion and velocity measurement, by tissue Doppler echocardiography.

Echocardiography was also the first ultrasound subspecialty to use intravenous contrast. Echocardiography is performed by cardiac sonographers, cardiac physiologists (UK), or physicians trained in echocardiography.

Recognized as the "Father of Echocardiography", the Swedish physician Inge Edler (1911–2001), a graduate of Lund University, was the first of his profession to apply ultrasonic pulse echo imaging in diagnosing cardiac disease, which the acoustical physicist Floyd Firestone had developed to detect defects in metal castings. In fact, Edler in 1953 produced the first echocardiographs using an industrial Firestone-Sperry Ultrasonic Reflectoscope. In developing echocardiography, Edler worked with the physicist Carl Hellmuth Hertz, the son of the Nobel laureate Gustav Hertz and grandnephew of Heinrich Rudolph Hertz.

Medical uses

Health societies recommend the use of echocardiography for initial diagnosis when a change in the patient's clinical status occurs and when new data from an echocardiogram would result in the physician changing the patient's care. Diagnostic criteria for numerous cardiac diseases are based on echocardiography studies. For example, the differentiation of mild, moderate, and severe valvular disease is based upon measured criteria. Another example is the estimation of heart function by the left ventricular ejection fraction (LVEF) has vast uses including classification of heart failure and cut offs for implantation of implantable cardioverter-defibrillators.

Health societies do not recommend routine testing when the patient has no change in clinical status or when a physician is unlikely to change care for the patient based on the results of testing. A common example of overuse of echocardiography when not indicated is the use of routine testing in response to a patient diagnosis of mild valvular heart disease. In this case, patients are often asymptomatic for years before the onset of deterioration and the results of the echocardiogram would not result in a change in care without other change in clinical status.

Echocardiography has a vast role in pediatrics, diagnosing patients with valvular heart disease and other congenital abnormalities. An emerging branch is fetal echocardiography, which involves echocardiography of an unborn fetus.

Types:

There are three primary types of echocardiography: transthoracic, transesophageal, and intracardic. Stress testing utilizes tranthoracic echo in combination with an exercise modality (e.g., a treadmill). Intravascular ultrasound is included below, but is as the name indicates more "ultrasound" than "echocardiography" as it is imaging the walls of a vessel rather than the heart.

Transthoracic echocardiogram

A standard echocardiogram is also known as a transthoracic echocardiogram (TTE) or cardiac ultrasound, and it is used for rapid evaluation of a patient at their bedside.

In this case, the echocardiography transducer (or probe) is placed on the chest wall (or thorax) of the subject, and images are taken through the chest wall. This is a non-invasive, highly accurate, and quick assessment of the overall function of the heart.

TTE utilizes several "windows" to image the heart from different perspectives. Each window has advantages and disadvantages for viewing specific structures within the heart and, typically, numerous windows are utilized within the same study to fully assess the heart. Parasternal long and parasternal short axis windows are taken next to the sternum, the apical two/three/four chamber windows are taken from the apex of the heart (lower left side), and the subcostal window is taken from underneath the edge of the last rib.

TTE utilizes one- ("M mode"), two-, and three-dimensional ultrasound (time is implicit and not included) from the different windows. These can be combined with pulse wave or continuous wave Doppler to visualize the velocity of blood flow and structure movements. Images can be enhanced with "contrast" that are typically some sort of micro bubble suspension that reflect the ultrasound waves.

Transesophageal echocardiogram

A transesophageal echocardiogram is an alternative way to perform an echocardiogram. A specialized probe containing an ultrasound transducer at its tip is passed into the patient's esophagus via the mouth, allowing image and Doppler evaluation from a location directly behind the heart. It is most often used when transthoracic images are suboptimal and when a clearer and more precise image is needed for assessment. This test is performed in the presence of a cardiologist, anesthesiologist, registered nurse, and ultrasound technologist. Conscious sedation and/or localized numbing medication may be used to make the patient more comfortable during the procedure.

TEE, unlike TTE, does not have discrete "windows" to view the heart. The entire esophagus and stomach can be utilized, and the probe advanced or removed along this dimension to alter the perspective on the heart. Most probes include the ability to deflect the tip of the probe in one or two dimensions to further refine the perspective of the heart. Additionally, the ultrasound crystal is often a two-dimension crystal and the ultrasound plane being used can be rotated electronically to permit an additional dimension to optimize views of the heart structures. Often, movement in all of these dimensions is needed.

TEE can be used as stand-alone procedures, or incorporated into catheter- or surgical-based procedures. For example, during a valve replacement surgery the TEE can be used to assess the valve function immediately before repair/replacement and immediately after. This permits revising the valve mid-surgery, if needed, to improve outcomes of the surgery.

Stress echocardiography

A stress echocardiogram, also known as a stress echo, uses ultrasound imaging of the heart to assess the wall motion in response to physical stress. First, images of the heart are taken "at rest" to acquire a baseline of the patient's wall motion at a resting heart rate. The patient then walks on a treadmill or uses another exercise modality to increase the heart rate to his or her target heart rate, or 85% of the age-predicted maximum heart rate (220 − patient's age). Finally, images of the heart are taken "at stress" to assess wall motion at the peak heart rate. A stress echo assesses wall motion of the heart; it does not, however, create an image of the coronary arteries directly. Ischemia of one or more coronary arteries could cause a wall motion abnormality, which could indicate coronary artery disease. The gold standard test to directly create an image of the coronary arteries and directly assess for stenosis or occlusion is a cardiac catheterization. A stress echo is not invasive and is performed in the presence of a licensed medical professional, such as a cardiologist, and a cardiac sonographer.

Intracardiac echocardiography

Intracardiac echocardiography (ICE) is specialized form of echocardiography that uses catheters to insert the ultrasound probe inside the heart to view structures from within the heart. ICE is often used as a part of the cardiac procedure of crossing the interatrial septum with a transseptal puncture to permit catheter access from the right atrium to the left atrium; alternative access to the left heart would be retrograde through the aorta and across the aortic valve into the left ventricle.

ICE has the benefit over transthoracic echocardiography in that an operator who is performing a sterile procedure can also operate the ICE catheter and it is not limited to visibility problems that can arise with transthoracic or transesophageal echo. Though, there are image quality limitations due to size constraints of the probe being limited to a catheter.

ICE is often inserted through the femoral vein and into the right atrium. From the right atrium, visualization of the interatrial septum, all four cardiac chambers, all four valves, and the pericardial space (for an effusion) can be readily visualized. It can also be advanced across the atrial septum into the left atrium to visualize the left atrial appendage during left atrial appendage occlusion device deployment.

Utilization of ICE imagery can be incorporated into the 3-D models built with electroanatomic mapping systems.

Intravascular ultrasound

Intravascular ultrasound (IVUS) is a specialized form of echocardiography that uses a catheter to insert the ultrasound probe inside blood vessels. This is commonly used to measure the size of blood vessels and to measure the internal diameter of the blood vessel. For example, this can be used in a coronary angiogram to assess the narrowing of the coronary artery. If the catheter is retraced in a controlled manner, then an internal map can be generated to see the contour of the vessel and its branches.

Additional Information

Echocardiography is a diagnostic technique that uses ultrasound (high-frequency sound waves) to produce an image of the internal structures of the heart. A piezoelectric transducer placed on the surface of the chest emits a short burst of ultrasound waves and then measures the reflection, or echo, of the sound as it bounces back from cardiac structures such as the heart valves and the muscle wall. The transducer does this by converting electrical impulses into a narrow ultrasonic beam that penetrates body tissues. The reflected sound waves are detected by a receiver that is also placed on the chest. The waves are transformed back into electrical impulses and are projected on the screen of a cathode-ray oscilloscope.

The reflected sound waves indicate places where changes in tissue density occur. As a result, echoes from varied depths produce an image of the walls and valves of the heart and of their motions. Such information is used to evaluate chamber size, wall thickness, and valve structure. The procedure can aid in diagnosing valve disease (e.g., endocarditis and mitral valve prolapse), congenital heart diseases, intracardiac tumours, and other cardiac abnormalities.

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Echocardiogram/Echocardiography

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