Echocardiogram (Echo)
A non-invasive ultrasound examination of the heart that evaluates cardiac chamber dimensions, muscle thickness, valve function, and blood flow velocity.
💬 In Plain English
An echocardiogram (commonly called an "echo") is an ultrasound dedicated entirely to the heart. While regular chest X-rays only show the outside silhouette and shadow of the heart, an echo looks straight through the heart walls in real time. It lets veterinary cardiologists watch the heart valves flap, measure the thickness of the muscle walls, calculate how much blood the heart squeezes out with each beat, and use color Doppler to map backward leaking blood jets. It is the definitive gold standard for diagnosing heart disease in dogs and cats.
🔬 Clinical & Technical Depth
For Vets & TechniciansFormal Clinical Definition
Transthoracic acoustic cardiac evaluation utilizing 2D B-mode imaging, M-mode dimensional measurements, and spectral/color-flow Doppler interrogation. Quantifies left ventricular internal dimensions, fractional shortening, ejection fraction, left atrial-to-aortic root ratio (LA:Ao), and transvalvular pressure gradients.
Why Veterinarians Use It
Veterinarians and cardiologists use echocardiography to determine the exact structural cause of a heart murmur, screen breeds for cardiomyopathy, and stage valve disease.
Clinical Context Encountered
Performed by board-certified veterinary cardiologists (DACVIM-Cardiology) or trained practitioners using specialized cardiac transducers.
Clinical Reference Guide (Diagnostic Test)
- •In cats, an enlarged left atrium on echocardiogram carries a high risk of forming a left atrial blood clot that can break off and cause a fatal aortic thromboembolism (saddle thrombus).
❓ Questions to Ask Your Veterinarian
Take these actionable questions with you to your next clinic visit or appointment:
- 1What did the echo reveal about left atrial size (LA:Ao ratio)?
- 2Is the heart muscle abnormally thickened (hypertrophic) or thinned and dilated?
- 3Is my pet in Stage B1 or Stage B2 heart disease, and should heart medications (like pimobendan) be started?
- 4Does Doppler confirm significant mitral or tricuspid valve regurgitation?
Academic & Clinical References
- ACVIM Guidelines for Echocardiographic Assessment of Canine and Feline Heart DiseaseOrganization: American College of Veterinary Internal Medicine (ACVIM) • Accessed: 2026-01-10https://www.acvim.org