ECHOCARDIOGRAPHY

✓ Medically ReviewedINVESTIGATIONID: MDBT0297🚨 TRIAGE: URGENT

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Definition

CLINICAL DEFINITION

Echocardiography is a non-invasive diagnostic imaging modality that uses reflected ultrasound waves to generate real-time two-dimensional, Doppler, and three-dimensional images of the cardiac chambers, valves, great vessels, and pericardium. It enables assessment of cardiac structure, systolic and diastolic function, valvular integrity, haemodynamics, and pericardial disease. The term encompasses transthoracic, transesophageal, stress, and contrast echocardiographic techniques.

IN PLAIN ENGLISH

Echocardiography is an ultrasound test that creates moving pictures of the heart. It shows how well the heart pumps, how the valves work, and whether there is fluid around the heart. It is painless, safe, and widely used to diagnose and monitor heart conditions.

COMMON MISCONCEPTION / WHAT IT DOES NOT MEAN

Echocardiography is NOT a single test; it encompasses multiple modalities (transthoracic, transesophageal, stress, contrast, and three-dimensional techniques) with different indications and risk profiles. It is also NOT a substitute for clinical assessment, electrocardiography, or advanced imaging such as cardiac magnetic resonance or computed tomography when those are specifically indicated.

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Word Breakdown

echo-

=echo — reflected sound (from Greek 'ēkhō')

-cardiography

=-cardiography — process of recording the heart (from Greek 'kardia' heart + 'graphein' to write)

Literal Meaning: Recording of the heart using reflected sound

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Abbreviations

TTE=Transthoracic Echocardiography — ultrasound probe placed on the chest wall; the most common mode

TEE=Transesophageal Echocardiography — probe passed into the esophagus for superior posterior cardiac imaging

TTE=Transthoracic Echocardiography — non-invasive first-line cardiac ultrasound

Echo=Colloquial abbreviation for echocardiography/echocardiogram — widely used in clinical notes

Stress echo=Stress Echocardiography — echocardiography combined with physical or pharmacological stress to assess inducible ischaemia or valve dynamics

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Synonyms & Variants

Echocardiogram›Cardiac Ultrasound›Ultrasonic Cardiography (historical)›

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Category-Specific Context

Echocardiography is an Investigation: it is a diagnostic test that gathers data about cardiac anatomy and physiology rather than being a symptom, sign, disease, or therapeutic procedure. Within this category, it spans a family of techniques — transthoracic (TTE), transesophageal (TEE), stress, contrast, and three-dimensional echocardiography — each with distinct indications, image quality, and risk profiles. The choice of modality depends on the clinical question, patient habitus, and need for invasive or stress-based assessment.

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Clinical Context & Usage

CLINICAL SETTINGS

Emergency DepartmentCardiology Outpatient ClinicIntensive Care UnitOperating TheatreEchocardiography LaboratoryGeneral Medicine Ward

USAGE & DOCUMENTATION NOTES

In clinical documentation, echocardiography is usually recorded as 'TTE' or 'TOE/TEE' with a summary of key measurements such as left ventricular ejection fraction (LVEF), chamber dimensions, valve severity, and pericardial findings. Ward rounds and referral letters commonly include phrases such as 'TTE showed moderately reduced LVEF with mild mitral regurgitation' or 'TEE requested to exclude endocarditis'. Measurements are reported in standard units (mm for dimensions, % for LVEF, m/s for Doppler velocities), and the report should specify the modality, image quality, and any limitations.

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Primary Causes & Pathophysiology

PATHOPHYSIOLOGY

Echocardiography generates images by emitting high-frequency sound waves (ultrasound) from a piezoelectric transducer and detecting the reflected echoes from tissue interfaces. The time delay and intensity of the returning echoes are processed to construct real-time two-dimensional images of cardiac structures. Doppler echocardiography measures the frequency shift of sound waves reflected from moving red blood cells, allowing quantification of blood flow velocity, direction, and turbulence. This enables assessment of valvular stenosis and regurgitation, intracardiac shunts, and cardiac output. Three-dimensional echocardiography reconstructs volumetric datasets, improving quantification of chamber volumes and valve morphology. The technique does not itself alter physiology; it provides anatomical and haemodynamic information that reflects the underlying cardiac pathology.

PRIMARY CAUSES

Heart Failure

Echocardiography detects reduced or preserved ejection fraction, chamber dilatation, and diastolic dysfunction that define heart failure phenotypes.

Valvular Heart Disease

Doppler and two-dimensional imaging quantify stenosis severity (e.g., aortic valve area, gradients) and regurgitation severity (e.g., vena contracta, regurgitant volume).

Pericardial Effusion and Tamponade

Echocardiography visualises pericardial fluid and assesses haemodynamic compromise through right ventricular diastolic collapse and inferior vena cava plethora.

Cardiomyopathy

Wall thickness, chamber dimensions, and systolic/diastolic function patterns distinguish hypertrophic, dilated, restrictive, and arrhythmogenic phenotypes.

Infective Endocarditis

Transesophageal echocardiography detects vegetations, abscesses, and valve destruction with higher sensitivity than transthoracic imaging.

Congenital Heart Disease

Echocardiography defines intracardiac shunts, valve anomalies, and great vessel relationships, often confirmed with three-dimensional imaging.

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Epidemiology

Age Group:All age groups; indications vary by age (e.g., congenital heart disease in neonates and children, valvular degeneration and heart failure in older adults).

Sex Predilection:Equal

Red Flags & Triage ★

TRIAGE LEVEL

🚨 URGENT

DO NOT MISS — LIFE-THREATENING PRESENTATIONS

Haemodynamic instability with a large pericardial effusion — consider cardiac tamponade; urgent drainage may be required.
Suspected acute aortic dissection or a new severe murmur with fever — consider aortic dissection or infective endocarditis and escalate imaging (e.g., TEE or CT angiography) urgently.
Severe left ventricular dysfunction (LVEF <30%) with pulmonary oedema or cardiogenic shock — requires urgent heart failure management and critical care assessment.

URGENT EVALUATION TRIGGERS

Unexplained hypotension or shock with suspected cardiac tamponade or severe ventricular dysfunction.
Suspected acute aortic dissection or acute valvular regurgitation with haemodynamic compromise.
New murmur with fever or embolic phenomena suggesting infective endocarditis.
Chest pain with dynamic ECG changes and new regional wall motion abnormality on echocardiography.

Contraindications & Precautions

CONTRAINDICATIONS

Transesophageal echocardiography — absolute: esophageal perforation
esophageal stricture or obstruction
esophageal tumor
esophageal diverticulum
active upper gastrointestinal bleeding
recent esophageal or gastric surgery.
Transesophageal echocardiography — relative: esophageal varices
coagulopathy or thrombocytopenia
recent upper GI bleed
severe cervical spine disease limiting neck mobility
symptomatic hiatal hernia
Barrett's esophagus.
Transthoracic echocardiography — no absolute contraindications; poor acoustic windows may limit image quality.

SPECIAL PRECAUTIONS

For transesophageal echocardiography: ensure adequate fasting (typically ≥4–6 hours for solids
≥2 hours for clear fluids) and secure airway protection.
Review anticoagulation and bleeding risk before transesophageal echocardiography; correct severe coagulopathy when clinically feasible.
Use a bite block and careful probe manipulation to reduce dental and oropharyngeal injury.
For stress echocardiography: monitor for arrhythmias
hypotension
and ischaemia; have resuscitation equipment available.

Complications

DOWNSTREAM CLINICAL COMPLICATIONS

Transthoracic echocardiography is non-invasive and has no significant procedure-related complications.
Transesophageal echocardiography: esophageal perforation — rare (approximately 0.01–0.03%) but associated with high mortality (up to 30% in some series).
Transesophageal echocardiography: transient arrhythmias
dental injury
odynophagia
and minor pharyngeal bleeding.
Contrast echocardiography: adverse reactions to ultrasound contrast agents (rare)
including hypersensitivity and pulmonary hypertension exacerbation.

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Reference Ranges

NORMAL RANGELeft ventricular ejection fraction (LVEF) by two-dimensional echocardiography: normal range 52–72% in men and 54–74% in women (ASE/EACVI). Other parameters (chamber dimensions, valve velocities) have sex- and body-surface-area-specific reference ranges.

UNIT OF MEASUREMENTMultiple units: % (LVEF), mm (chamber dimensions), mL (volumes), m/s (Doppler velocities), mmHg (gradients).

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Confused With (LASA & DDx) ★

LEXICAL (LASA) — SIMILAR NAMES

Electrocardiogram (ECG)

Similar abbreviation 'echo' may be confused; ECG records electrical activity, while echocardiography provides structural and functional ultrasound images.

Echocardiogram vs Electrocardiogram

Both are cardiac tests; echocardiogram is ultrasound imaging, electrocardiogram is electrical recording.

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Clinical Pearls

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Echocardiography is highly operator- and patient-dependent; poor acoustic windows in obesity, COPD, or chest wall deformity may reduce accuracy, and alternative imaging (TEE, CMR, CT) should be considered when the clinical question remains unanswered.

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A normal LVEF does not exclude significant diastolic dysfunction or valvular disease; diastolic function and valve severity must be assessed systematically in every comprehensive study.

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Transesophageal echocardiography provides superior visualisation of posterior structures (atrial septum, left atrial appendage, mitral valves) and is the test of choice for suspected infective endocarditis or cardioembolic source when transthoracic images are inadequate.

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Stress echocardiography can unmask inducible ischaemia or dynamic valve dysfunction that is not apparent at rest; adequate heart rate response and image quality are essential for diagnostic accuracy.

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Echocardiographic findings must always be interpreted alongside the clinical context; a single measurement or view should not be used in isolation to confirm or exclude a diagnosis.

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Example Usage & SOAP

CLINICAL SENTENCE

""TTE demonstrated a mildly dilated left ventricle with an LVEF of 42%, moderate mitral regurgitation, and a small pericardial effusion.""

IN A SOAP NOTE

S: 68-year-old man with progressive exertional dyspnoea and orthopnoea. O: BP 148/90 mmHg, HR 96/min, SpO2 94% on room air; bibasal crepitations. TTE: LVEF 38%, moderate-severe mitral regurgitation, estimated pulmonary artery systolic pressure 48 mmHg. A: Heart failure with reduced ejection fraction, likely secondary to degenerative mitral regurgitation. P: Start guideline-directed medical therapy; refer to cardiology for valve assessment; repeat TTE in 3 months.

DIFFERENTIAL DIAGNOSIS CONTEXT

Differential for a patient with dyspnoea and a systolic murmur: (1) degenerative mitral regurgitation — echocardiography shows valve thickening and eccentric regurgitant jet; (2) aortic stenosis — Doppler demonstrates increased transvalvular velocity and gradient; (3) hypertrophic cardiomyopathy — asymmetric septal hypertrophy with dynamic outflow obstruction; (4) heart failure with reduced ejection fraction — global hypokinesis and reduced LVEF. Echocardiography is the pivotal investigation that distinguishes these entities and guides management.

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Classifications & Scoring

GRADING SYSTEM

ASE/EACVI grading of diastolic dysfunction

Grades diastolic function from normal to grade III based on mitral inflow patterns, tissue Doppler e' velocities, E/e' ratio, and left atrial volume.

GRADING SYSTEM

ASE grading of valvular regurgitation severity

Grading of mitral, aortic, tricuspid, and pulmonary regurgitation as mild, moderate, or severe using colour Doppler, vena contracta, regurgitant volume, and effective regurgitant orifice area.

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References & Coding

LITERATURE CITATIONS & GUIDELINES

[1]Lang RM et al. Recommendations for cardiac chamber quantification by echocardiography in adults: an update from the American Society of Echocardiography and the European Association of Cardiovascular Imaging. J Am Soc Echocardiogr. 2015;28(1):1-39.e14.

[2]Nagueh SF et al. Recommendations for the Evaluation of Left Ventricular Diastolic Function by Echocardiography: An Update from the American Society of Echocardiography and the European Association of Cardiovascular Imaging. J Am Soc Echocardiogr. 2016;29(4):277-314.

[3]Hahn RT et al. Guidelines for Performing a Comprehensive Transesophageal Echocardiographic Examination: Recommendations from the American Society of Echocardiography and the Society of Cardiovascular Anesthesiologists. J Am Soc Echocardiogr. 2013;26(9):921-964.

[4]Bora V, Pulijal SV. Transesophageal Echocardiography in Critical Care. Curr Pulmonol Rep. 2024;13:1-12.

[5]American Society of Echocardiography. Guidelines and Standards: Comprehensive Transthoracic Echocardiographic Examination in Adults. Available at asecho.org/guidelines (accessed 2026).

MEDICAL DISCLAIMER — This content is intended for educational purposes and qualified healthcare professionals only. Always refer to current clinical diagnostic criteria, institutional protocols, and official guidelines. Medobo is not responsible for clinical decisions made based on this content.