An abnormal echocardiogram can look like many things: a heart chamber that has ballooned larger than it should be, a wall segment sitting still while the rest of the heart contracts, a valve that leaks a colored jet of blood backward, or a dark fluid-filled space surrounding the heart where none should exist. Because an echocardiogram uses ultrasound to produce real-time images of the heart’s structure and motion, “abnormal” is not a single finding but a category that spans dozens of distinct patterns, each pointing toward a different problem. What those patterns actually look like on screen, and what they mean for you, depends on which part of the heart is affected and how severely.
How “Normal” Is Defined
Before anything can look abnormal, there has to be a clear picture of normal. Professional societies publish reference values for heart chamber sizes, wall thickness, and pumping efficiency, updated as imaging technology and population data improve. The British Society of Echocardiography, for instance, maintains a guideline covering left ventricular dimensions, volumes, ejection fraction, left atrial size, right heart measurements, and aortic dimensions.1PubMed Central. Normal reference intervals for cardiac dimensions and function for use in echocardiographic practice: a guideline from the British Society of Echocardiography These are not one-size-fits-all numbers. Normal ranges shift depending on your sex, age, body size, and ethnicity. A large study of older adults from the Multi-Ethnic Study of Atherosclerosis provided normative values across different age groups, sexes, and racial or ethnic backgrounds, adjusting for body size using several different scaling methods.2PubMed Central. Reference Values for Indexed Echocardiographic Chamber Sizes in Older Adults: The Multi-Ethnic Study of Atherosclerosis When a measurement falls outside these published ranges, the sonographer or cardiologist flags it as abnormal. The degree to which it deviates, and in which direction, shapes the diagnosis.
Weak Pumping and Reduced Ejection Fraction
One of the most straightforward abnormalities is a heart that does not squeeze strongly enough. The ejection fraction measures what percentage of blood in the left ventricle gets pushed out with each beat. In a healthy heart, the lower limit of normal sits around 50% for women and just under 50% for men.3PubMed. Normalized Echocardiographic Values From Guideline-Directed Dedicated Views for Cardiac Dimensions and Left Ventricular Function On screen, a heart with a reduced ejection fraction looks sluggish. The walls move inward only slightly during contraction, and the chamber barely changes size between filling and emptying. The visual difference between a healthy squeeze and a weak one can be dramatic, sometimes obvious even to an untrained eye watching the monitor. A reduced ejection fraction in someone with symptoms like shortness of breath and swelling confirms that heart failure is responsible for their condition.4PubMed Central. Heart failure with a normal left ventricular ejection fraction: diastolic heart failure
Importantly, not all heart failure looks like a weak pump. Some people develop heart failure with a preserved ejection fraction, meaning the heart squeezes fine but does not relax and fill properly. That version of the problem shows up in a different set of measurements, discussed further below.
Wall Motion Abnormalities
A healthy left ventricle contracts in a coordinated, uniform fashion: every segment of the wall thickens and moves inward at roughly the same time and to roughly the same degree. After a heart attack, the patch of muscle starved of blood stops contracting normally. On the echo screen, you can see a segment that barely moves (hypokinesis), does not move at all (akinesis), or actually bulges outward while the rest of the heart squeezes inward (dyskinesis). These regional wall motion abnormalities are among the most clinically significant findings an echo can reveal.
A large registry study of nearly half a million people found that about 15% of men and roughly 8% of women examined with echocardiography had at least one wall motion abnormality. The consequences were serious: five-year mortality nearly doubled in both sexes when any abnormality was present, jumping from about 18% to 30% in men and from about 15% to 31% in women.5PubMed Central. Pattern and Prognostic Impact of Regional Wall Motion Abnormalities in 255 697 Men and 236 641 Women Investigated with Echocardiography The location of the abnormality matters too, because it tells cardiologists which coronary artery is likely blocked or damaged.
Detecting these abnormalities requires dividing the left ventricle into standardized segments (typically 16 or 17) and grading each one. It sounds straightforward, but it depends heavily on image quality and reader experience. Automated color kinesis techniques were developed to make this more objective, overlaying color maps that track endocardial motion so that abnormal segments stand out visually.6PubMed. Echocardiographic quantification of regional left ventricular wall motion with color kinesis
Thickened Walls and Enlarged Chambers
An abnormal echo frequently shows chambers that are too big or walls that are too thick. When the left ventricle has to pump against persistently high blood pressure, for example, the muscle responds by growing thicker, a process called hypertrophy. On the echo, the wall appears wider than the published normal range, and the overall mass of the left ventricle is elevated.
Hypertrophic cardiomyopathy, a genetic condition, produces some of the most striking hypertrophy patterns. In a study of 600 patients, wall thickness ranged from 15 to 52 millimeters, with the ventricular septum being the most commonly affected region (thickened in 96% of patients). The patterns varied widely: hypertrophy involved two segments in about 38% of patients, three or more segments in 34%, and was confined to a single segment in 28%.7Journal of the American College of Cardiology. Phenotypic spectrum and patterns of left ventricular hypertrophy in hypertrophic cardiomyopathy: Morphologic observations and significance as assessed by two-dimensional echocardiography in 600 patients The classic textbook picture of hypertrophic cardiomyopathy is a septum much thicker than the back wall, but the reality is more diverse. An earlier study of 89 patients found that roughly a third had symmetric (concentric) thickening, about 55% had asymmetric septal hypertrophy, and 14% had thickening concentrated at the tip of the ventricle.8PubMed. Distribution of left ventricular hypertrophy in hypertrophic cardiomyopathy: a two-dimensional echocardiographic study
Chamber enlargement is the flip side. A dilated left ventricle looks like a ballooned-out chamber that holds too much blood, and the walls appear thinner because they have been stretched. An enlarged left atrium is another common finding, and it carries its own risks. Data from the Framingham Heart Study showed that for every 10-millimeter increase in left atrial size, the relative risk of stroke more than doubled in men and rose roughly 40% in women.9Circulation. Left atrial size and the risk of stroke and death. The Framingham Heart Study An enlarged left atrium on echo is a red flag for atrial fibrillation, blood clot formation, and overall cardiovascular risk.
Valve Problems
The echocardiogram is the primary tool for evaluating all four heart valves, and valve abnormalities are among the most visually distinctive findings. Two broad categories dominate: stenosis (a valve that does not open wide enough) and regurgitation (a valve that does not close completely, allowing blood to leak backward).
In stenosis, the valve leaflets appear thickened, stiff, or calcified, and they resist opening fully. The opening area shrinks, forcing blood through a narrower gap. On Doppler imaging, the velocity of blood flowing through the narrowed valve shoots up, and the pressure gradient across the valve rises. Aortic stenosis is the most common valvular disease in older adults, and the echo can show the valve leaflets covered in bright calcified deposits that limit their motion.
Regurgitation produces a different visual signature. When you add color Doppler to the image, a leaky valve displays a turbulent jet of color shooting backward into the chamber it came from. The size and direction of this jet provide a quick qualitative sense of severity. A more precise measurement is the vena contracta width, which is the narrowest point of the regurgitant jet right at the leaky orifice. In mitral regurgitation, a vena contracta wider than 0.7 centimeters indicates severe leakage.10PubMed Central. Doppler echocardiographic assessment of valvar regurgitation A small amount of regurgitation in certain valves is considered normal, so not every colored jet on the screen is cause for alarm.
Right Heart and Pulmonary Pressure
The right side of the heart often gets less attention, but abnormalities there are telling. A dilated right ventricle or one that squeezes poorly can indicate pulmonary hypertension, a blood clot in the lungs, or right-sided heart failure. In pulmonary arterial hypertension, patients who reached a clinical endpoint (such as hospitalization or death) had worse right ventricular function and higher estimated pressures in the pulmonary artery.11PubMed. Right ventricular strain related to pulmonary artery pressure predicts clinical outcome in patients with pulmonary arterial hypertension
Pulmonary embolism produces a recognizable constellation on echo. The right ventricle swells and may become larger than the left, the septum bows toward the left side, and a pattern called McConnell’s sign sometimes appears where the free wall of the right ventricle is akinetic while its tip (the apex) still contracts normally. Other findings include tricuspid regurgitation, elevated pulmonary artery pressures, and a reduced excursion of the tricuspid annulus.12PubMed. What are the echocardiographic findings of acute right ventricular strain that suggest pulmonary embolism? Not every pulmonary embolism shows these signs, and no single finding confirms the diagnosis on its own, but seeing several together raises suspicion considerably.
Fluid Around the Heart
One of the most visually obvious abnormalities is pericardial effusion, a collection of fluid in the sac surrounding the heart. On the echo screen, it appears as a dark, echo-free space between the bright heart muscle and the pericardium. When the amount of fluid is small, you may see it only behind the heart in certain views. Larger collections surround the heart on all sides, and the heart can appear to be swinging freely inside its fluid-filled sac.
The character of the fluid can provide clues. A simple effusion (like from a viral infection) tends to look uniformly dark. Hemorrhagic or purulent effusions may show echogenic, cloudy-looking material swirling within the fluid.13PubMed. Update on bedside ultrasound diagnosis of pericardial effusion When fluid accumulates quickly or in large volumes, it can compress the heart chambers. The right atrium and right ventricle, having the thinnest walls and lowest pressures, collapse first. Seeing chamber collapse on the echo, especially of the right atrium during ventricular contraction and the right ventricle during filling, signals cardiac tamponade, a life-threatening emergency.14PubMed Central. Echocardiographic Evaluation of Pericardial Effusion and Cardiac Tamponade Echocardiography can detect tamponade before it becomes clinically obvious, giving physicians a critical head start.
Stiff Hearts and Diastolic Dysfunction
A heart that squeezes fine but does not relax properly produces a subtler abnormality. Diastolic dysfunction does not jump off the screen the way a pericardial effusion or a flail valve leaflet does. Instead, it shows up in Doppler measurements of blood flow across the mitral valve and the velocity of the heart muscle itself as it relaxes. Current guidelines use the ratio of early to late filling velocity (E/A) across the mitral valve to grade diastolic function, and the ratio of transmitral flow velocity to tissue velocity at the mitral annulus (E/e’) to estimate filling pressures.15PubMed. A Test in Context: E/A and E/e’ to Assess Diastolic Dysfunction and LV Filling Pressure
In a healthy young heart, the E wave (early filling) is taller than the A wave (late filling from atrial contraction). As diastolic function worsens, the pattern shifts. In mild dysfunction, the E wave shrinks and the A wave dominates. In moderate dysfunction, the pattern can look deceptively normal again (a “pseudonormal” pattern that requires tissue Doppler to unmask). In severe dysfunction, a very tall E wave dominates because filling pressures are high and the stiff ventricle fills almost entirely in early diastole. This progression is graded from I to III, and each grade corresponds to increasingly elevated filling pressures and poorer outcomes.
Vegetations, Masses, and Infections
Echocardiography is the go-to imaging study when infective endocarditis is suspected. On the screen, a vegetation looks like an irregular, shaggy mass attached to a valve leaflet. It wiggles independently from the valve itself, and its size, shape, and mobility all factor into the risk of dangerous complications like embolism to the brain. Echocardiography can also identify abscesses, which appear as echo-lucent cavities near the valve, and new leaking around prosthetic valves.16PubMed Central. Infective Endocarditis: Echocardiographic Imaging and New Imaging Modalities Beyond infections, echoes sometimes reveal tumors, blood clots in a chamber, or strands of fibrous material attached to valves. A clot in the left atrial appendage, for instance, looks like a distinct mass inside the appendage and is a serious finding because it can break off and cause a stroke.
Congenital Findings
Some abnormalities on echo are structural defects present since birth, discovered incidentally or during evaluation of unexplained symptoms. A patent foramen ovale, a small flap-like opening between the two atria, is detected using a “bubble study”: agitated saline is injected into a vein, producing microbubbles that normally stay in the right heart. If bubbles cross to the left side within a few heartbeats, the flap is open. This technique is considered the gold standard for detecting a patent foramen ovale, though varying diagnostic criteria and the potential for both false-positive and false-negative results make interpretation less straightforward than it sounds.17PubMed. A critical review of patent foramen ovale detection using saline contrast echocardiography: when bubbles lie Atrial septal defects, ventricular septal defects, and bicuspid aortic valves are other congenital findings that echocardiography can identify, each with characteristic visual signatures and Doppler flow patterns.
When the Echo Looks Abnormal But the Heart Is Fine
Not every worrisome-looking echo finding represents real disease. Ultrasound image artifacts, caused by the physics of sound waves bouncing through tissue, can mimic serious conditions. Reverberation artifacts can create the appearance of a linear structure inside the aorta that looks like an aortic dissection flap. Near-field clutter can deposit bright echoes inside a chamber, mimicking a thrombus. These pitfalls are well recognized and can lead to misdiagnosis of conditions as serious as aortic dissection, thrombosis, and endocarditis if the reader is not careful.18PubMed Central. Fact or Artifact in Two-Dimensional Echocardiography: Avoiding Misdiagnosis and Missed Diagnosis 19PubMed. Ultrasound imaging artifacts: How to recognize them and how to avoid them
Athletic training presents another interpretive challenge. Intense endurance or strength training causes the heart to enlarge and the walls to thicken as a normal physiological adaptation. This “athlete’s heart” can overlap with the appearance of hypertrophic cardiomyopathy on echo, which is a concern because hypertrophic cardiomyopathy is one of the most common causes of sudden cardiac death in young athletes.20PubMed Central. Distinguishing hypertrophic cardiomyopathy from athlete’s heart: a clinical problem of increasing magnitude and significance The overlap in wall thickness between a well-conditioned athlete and someone with mild hypertrophic cardiomyopathy can be small enough that echocardiography alone does not settle the question. Additional clues like diastolic function, the pattern of thickening, cavity size, and family history help sort the two apart.21PubMed. Athlete’s heart or hypertrophic cardiomyopathy?
Stress Echocardiography and Provoked Abnormalities
A resting echocardiogram captures the heart under minimal demand. Some abnormalities only appear when the heart is pushed harder, which is why stress echocardiography exists. The test pairs standard echo imaging with a stressor, either physical exercise on a treadmill or a medication that makes the heart beat faster and harder. When a coronary artery is partially blocked, the muscle it supplies may look perfectly normal at rest but develops a wall motion abnormality under stress as it becomes ischemic.22PubMed Central. Stress echocardiography The sonographer captures images immediately before and after the stress, and the two sets are compared side by side. A segment that moved well at rest but becomes hypokinetic or akinetic with exertion points to a flow-limiting blockage in the artery feeding that territory. This makes stress echo especially useful for people whose symptoms occur only with physical activity.
Strain Imaging and Newer Techniques
Standard echocardiography evaluates whether a wall segment moves or not, but it cannot easily tell you how much the muscle is actually deforming. Strain imaging, a newer technique, tracks tiny speckles within the heart muscle frame by frame, measuring how much each region shortens, lengthens, or rotates during a heartbeat. This can pick up subtle dysfunction that the eye would miss on a regular echo. In conditions like hypertrophic cardiomyopathy, strain imaging can detect impaired regional mechanics even when the ejection fraction still looks normal.23PubMed. Echocardiographic advances in hypertrophic cardiomyopathy: Three-dimensional and strain imaging echocardiography
Strain values are reported as percentages, with healthy segments showing greater deformation than diseased ones. In one study of patients with reduced ejection fraction undergoing cardiac surgery, diseased segments averaged about 12% radial strain compared to about 25% in normally perfused segments, and radial strain correlated strongly with wall motion scores both before and after surgery.24Journal of Cardiothoracic and Vascular Anesthesia. Myocardial Strain Imaging: A Review for General and Echocardiographic Applications in Cardiac Anesthesia Three-dimensional echocardiography adds another layer, allowing clinicians to assess chamber volumes and valve anatomy from angles that two-dimensional imaging cannot provide.
Artificial intelligence is also entering the picture. Deep learning models trained on large echo datasets can now identify wall motion abnormalities with accuracy comparable to expert readers. One recent study found that an AI model detected any regional wall motion abnormality with performance on par with human experts and significantly outperformed novice readers.25PubMed Central. Echocardiographic Detection of Regional Wall Motion Abnormalities Using Artificial Intelligence Compared to Human Readers These tools are not replacing cardiologists but could help flag abnormal studies faster, particularly in settings where expert readers are not immediately available.
How Aging Changes What “Normal” Looks Like
An echocardiogram in a 75-year-old will not look the same as one in a 30-year-old, even if both hearts are healthy. With age, the left ventricle tends to get slightly thicker, the left atrium enlarges, the aortic root widens, and diastolic function declines. The SardiNIA study, which tracked echocardiographic changes in over 2,600 healthy subjects, identified three distinct aging trajectories: slow, normal, and accelerated. People on the accelerated trajectory showed structural and functional changes associated with higher cardiovascular and even non-cardiovascular mortality.26PubMed Central. Echocardiographic heart ageing patterns predict cardiovascular and non-cardiovascular events and reflect biological age: the SardiNIA study This means that what looks mildly abnormal in a 40-year-old might fall within the expected range for a 75-year-old, and vice versa. Age-specific reference ranges exist precisely to handle this, but not every clinical report explicitly adjusts for them, which is one reason a conversation with your cardiologist about your specific echo results matters more than comparing numbers to a single cutoff you found online.