Echocardiography
Echocardiography is cardiac ultrasound: a medical imaging method that uses sound waves to show the heart's chambers, valves, pumping function, wall motion, blood flow, pressures, and structural problems in real time.
What echocardiography is
Echocardiography, often called echo, is ultrasound imaging of the heart. A transducer sends sound waves into the chest or, in some exams, from the esophagus, and returning echoes are turned into moving images. Clinicians use echo to study heart size, pumping function, valve movement, blood flow, pressure estimates, congenital problems, fluid around the heart, and changes after illness or treatment.
How cardiac ultrasound works
Echo uses the same basic physics as diagnostic medical sonography, but the target is the moving heart. The exam must capture valves opening and closing, walls thickening and relaxing, blood moving through chambers, and changes across the cardiac cycle. Doppler techniques measure the direction and speed of blood flow, which helps evaluate valve disease, shunts, and pressure gradients.
Transthoracic echo
A transthoracic echocardiogram is the most common form. The sonographer or clinician places the transducer on the chest and obtains views through acoustic windows between the ribs, under the breastbone, or near the upper abdomen. It is noninvasive and widely used for murmurs, heart failure, chest symptoms, shortness of breath, cardiomyopathy, valve disease, and follow-up care.
Other types of echo
A transesophageal echocardiogram places a probe in the esophagus to view the heart from closer behind the chest, often when detail is needed for valves, clots, infection, or procedures. Stress echo compares images at rest and with exercise or medicine. Fetal echo evaluates the developing heart. Focused bedside echo can answer urgent questions in emergency or intensive-care settings.
What it can show
Echo can show reduced pumping function, abnormal wall motion, enlarged chambers, thickened heart muscle, valve stenosis, valve regurgitation, congenital defects, pericardial effusion, signs of pulmonary hypertension, and some complications of infection, clots, or surgery. It is often paired with ECGs, blood tests, CT, MRI, nuclear medicine, catheterization, or clinical examination.
Image quality and limits
Echocardiography is powerful but not perfect. Image quality depends on body habitus, lung disease, chest wall shape, surgical changes, movement, rhythm, equipment, and operator skill. Some structures may be hard to see. Measurements can vary, and findings need clinical context. A limited echo may lead to contrast use, transesophageal echo, cardiac MRI, CT, or other testing.
Safety and patient care
Standard transthoracic echo uses no ionizing radiation and is generally painless, although probe pressure can be uncomfortable. Transesophageal echo is more invasive and may require fasting, throat numbing, sedation, monitoring, and recovery time. Good echo practice includes patient identification, clear communication, infection control, careful measurements, and timely reporting of urgent findings.
Why it matters
Echocardiography matters because the heart is a moving organ, and echo shows that motion directly. It can help explain breathlessness, fainting, murmurs, heart failure, valve disease, congenital problems, infection, and shock. Its value comes from combining real-time imaging, Doppler physics, anatomy, and clinical judgment at the bedside or in the lab.