Heart Health
What Does an Echocardiogram Actually Show? A Plain-Language Guide
Your annual physical does not scan your heart. An EKG captures the electrical signal — it tells you whether the heart is beating in a normal rhythm. A blood pressure cuff tells you about pressure in the arteries. But neither one shows you the valves opening and closing, the chambers filling and emptying, or the strength of the muscle itself. That is what an echocardiogram does. If you have any of the five symptoms below, you should stop waiting and get one.
1. Shortness of Breath
The heart's job is to pump oxygenated blood to the body. When it stops doing that efficiently — whether from a reduced ejection fraction, valve disease, fluid around the heart, or a stiffened ventricle that can't relax — the lungs bear the burden. They work harder to compensate for the drop in cardiac output. The result is breathlessness.
Unexplained shortness of breath, particularly with exertion, is one of the most common reasons a cardiologist orders an echo. It is also one of the most commonly ignored symptoms, because it is easy to attribute to deconditioning, weight, or anxiety. An echo takes that guesswork off the table. If the heart is the source, you will know within 45 minutes — along with exactly which component is responsible.
Breathlessness that wakes you at night, forces you to sleep propped up on pillows, or appears suddenly with mild activity is not something to watch and wait on.
2. Heart Palpitations
Palpitations — a fluttering sensation, a racing heart, a skipped beat, or a pounding you shouldn't be able to feel — can be completely benign. Caffeine, stress, and dehydration are common triggers. But they can also be the surface presentation of something structural: atrial fibrillation, cardiomyopathy, a leaking mitral valve, or a dilated left atrium that has stretched to the point where it can no longer maintain normal rhythm.
An EKG captures the electrical signal at the moment of the recording. If the arrhythmia isn't happening in that 12-second window, you won't see it. What an echo shows is the anatomy behind the rhythm — the size of the chambers, the integrity of the valves, the thickness and function of the muscle. It answers the question an EKG can't: what is the heart doing when this is happening, and why.
Palpitations with associated dizziness, lightheadedness, or near-syncope move this from a monitoring conversation to an immediate evaluation.
3. A Heart Murmur
A murmur is a sound. A stethoscope can detect it, but it cannot quantify it. Sound alone tells you that turbulent flow exists across a valve — it does not tell you whether the aortic valve is mildly calcified or severely stenotic, whether the mitral valve is leaking a trivial amount or regurgitating significantly, or whether intervention is weeks or years away.
An echocardiogram quantifies all of it. Doppler imaging measures the velocity and pressure gradient across each valve. It calculates valve area. It grades regurgitation severity from trace to severe. And it assesses the downstream consequences — how much the left ventricle has remodeled in response to the pressure or volume overload the defective valve is imposing.
If you have been told you have a heart murmur and have never had a formal echocardiogram to evaluate it, that evaluation is not optional. It is the standard of care.
A murmur heard once during a physical and never followed up is one of the most common missed findings I see. By the time symptoms appear, the valve disease is often already moderate to severe. Imaging it early changes management completely.
4. Atrial Fibrillation Diagnosis
If you have been told you have atrial fibrillation, an echocardiogram is part of the standard clinical workup — and for good reason. AFib does not happen in a vacuum. The echo evaluates the structural causes: mitral valve disease, a dilated left atrium, reduced ventricular function, hypertensive heart disease. It also checks for thrombus in the left atrial appendage before certain rhythm-control procedures, when safe anticoagulation timing is critical.
Beyond the acute workup, serial echocardiograms in AFib patients track how the heart is responding over time — whether rate control is preserving function, whether the atrium is continuing to dilate, whether the ejection fraction is holding.
5. Family History of Heart Disease
Hypertrophic cardiomyopathy, dilated cardiomyopathy, and early heart failure all carry heritable components. If a parent, sibling, or child has been diagnosed with cardiomyopathy or unexplained cardiac events — especially at a young age — a baseline echocardiogram establishes your structural starting point. If something is developing, you want to catch it while the heart is still compensating, not after it has begun to fail.
Family history of valve disease and aortic root abnormalities also warrants evaluation. An echo in Southern Maine is accessible, fast, and requires no referral. If you have the family history and have never been imaged, there is no reason to wait for a symptom to appear first.
Twenty years of doing this — the pattern I see most often is a patient who had symptoms for months, didn't think they were serious enough, and came in after something happened. An echocardiogram takes 45 minutes. No referral required. No waiting room. We come to you. If any of the five symptoms above apply to you, that's enough reason to schedule it.