If breathlessness is persistent, unexplained or accompanied by other cardiovascular symptoms, a cardiologist in Singapore can review the pattern of symptoms alongside medical history, cardiovascular risk factors, examination findings and previous test results.

The assessment can then help determine whether an echocardiogram or another investigation is relevant.

When Is an Echo Test Recommended for Shortness of Breath?

An echocardiogram may be considered when a doctor suspects that breathlessness could be related to a structural or functional heart problem.

For example, an echo test in Singapore may be considered when clinical assessment raises questions about:

• How effectively the heart is pumping
• Heart chamber size
• Heart muscle movement
• Heart valve structure and function
• Blood flow through the heart
• Certain forms of heart muscle disease
• Possible heart failure
• Fluid around the heart
• Findings associated with a heart murmur

An echocardiogram may also be used to assess or monitor someone with an existing cardiac condition.

The decision to arrange the test depends on the clinical circumstances. Breathlessness by itself does not mean that an echocardiogram is automatically needed.

What Is a Cardiac Echo Test?

A cardiac echo test, or echocardiogram, is an ultrasound examination of the heart.

During a standard transthoracic echocardiogram, a transducer is placed against different areas of the chest. Ultrasound waves are used to produce moving images of the heart and related structures.

These images can allow the healthcare team to assess how the heart moves and functions while it is beating.

Unlike an ECG, which records electrical activity, an echocardiogram primarily provides information about cardiac structure, movement and blood flow.

This distinction matters when assessing breathlessness because different investigations answer different clinical questions.

What Can an Echocardiogram Show When You Are Breathless?

If a cardiac cause of breathlessness is being considered, an echocardiogram can provide several types of information.

Heart Pumping Function

One measurement obtained during echocardiography is the left ventricular ejection fraction.

This describes the proportion of blood pumped out of the left ventricle during each contraction and provides information about systolic pumping function.

A reduced ejection fraction can occur in certain forms of heart failure or heart muscle disease.

However, ejection fraction is not the entire assessment. Some people can have symptoms of heart failure despite an ejection fraction that is not reduced, so the result needs to be interpreted alongside other echocardiographic findings and clinical information.

Heart Chamber Size

An echocardiogram can assess the size of the heart chambers.

Changes in chamber size can occur with several cardiac conditions, including certain valve disorders, heart muscle conditions and longstanding cardiovascular problems.

The significance of any finding depends on the person’s overall clinical picture.

Heart Muscle Movement

Ultrasound imaging allows the movement of the heart walls to be assessed during contraction and relaxation.

This can help identify abnormalities in the way the heart muscle is functioning.

A cardiologist interprets these findings alongside symptoms, medical history and other investigations rather than using the echocardiogram result in isolation.

Heart Valves

The heart contains valves that control the direction of blood flow between its chambers and into the major blood vessels.

Echocardiography can examine how these valves open and close and can assess blood-flow patterns across them.

Valve narrowing or leakage can affect how efficiently blood moves through the heart and, in some cases, may be associated with breathlessness, reduced exercise tolerance or other symptoms.

Blood Flow Through the Heart

Doppler echocardiography can assess the direction and speed of blood flow within the heart.

This information can contribute to the assessment of valve function and other haemodynamic changes.

Fluid Around the Heart

An echocardiogram can also identify fluid collecting within the sac surrounding the heart, known as a pericardial effusion.

Whether such a finding is clinically significant depends on the amount of fluid, its effects on heart function and the underlying cause.

Why Breathlessness When Lying Down Can Be Relevant

Some people notice that breathing becomes difficult when they lie flat and that they need to sit upright or prop themselves up to feel comfortable.

Others may wake during the night feeling breathless.

These patterns can occur when pressure or fluid builds up in the circulation associated with the lungs, including in people with heart failure. They are not exclusive to heart disease, so medical evaluation is needed to establish the cause.

Tell your doctor if you have noticed:

• Difficulty breathing while lying flat
• The need to change your sleeping position because of breathlessness
• Waking suddenly because you feel short of breath
• Breathlessness accompanied by swollen ankles or legs
• A noticeable reduction in the amount of physical activity you can manage

These details can help guide decisions about whether cardiac assessment is appropriate.

Does Breathlessness Always Mean Heart Failure?

No. Heart failure is one possible cardiac cause of breathlessness, but breathlessness alone does not establish the diagnosis.

Heart failure occurs when a structural or functional problem affects the heart’s ability to meet the body’s circulatory needs. Symptoms can include breathlessness, fatigue, reduced exercise tolerance and swelling around the ankles or other areas.

Doctors assess suspected heart failure using a combination of:

• Symptoms
• Medical history
• Physical examination
• Blood tests
• ECG findings
• Imaging
• Other investigations where appropriate

An echocardiogram can play an important role because it can assess cardiac structure and function, including ejection fraction and valve abnormalities.

However, the diagnosis is based on the overall clinical assessment rather than the echocardiogram alone.

Could Heart Valve Problems Cause Breathlessness?

Yes. Certain valve conditions can be associated with shortness of breath, particularly as their effect on heart function becomes clinically relevant.

Heart valves need to open sufficiently to allow blood to move forward and close adequately to limit backward flow.

A valve may become narrowed, known as stenosis, or may allow blood to leak backwards, known as regurgitation.

Depending on the valve involved and the severity of the problem, symptoms can include:

• Breathlessness
• Reduced exercise tolerance
• Fatigue
• Palpitations
• Chest discomfort
• Dizziness or fainting

An echocardiogram can assess valve structure, movement and blood-flow patterns. The findings help a cardiologist determine whether a valve abnormality is present and how it relates to the patient’s symptoms.

Can an Echocardiogram Detect Every Cause of Shortness of Breath?

No. This is an important limitation to understand.

An echocardiogram assesses particular aspects of cardiac structure and function. It does not directly diagnose every respiratory, blood-related or systemic cause of breathlessness.

For example, an echocardiogram does not replace assessment for:

• Asthma
• Chronic lung disease
• Pneumonia
• Anaemia
• Other respiratory or medical conditions

It also does not continuously record the heart rhythm in the way an ambulatory ECG monitor can.

A normal echocardiogram therefore does not mean that unexplained breathlessness should automatically be dismissed.

If symptoms persist, a doctor may need to investigate other possible causes.

What Other Tests Might Be Used for Breathlessness?

An echocardiogram is often one part of a broader assessment rather than a stand-alone test.

Depending on the symptoms and clinical findings, other investigations may include:

Electrocardiogram

An ECG records the electrical activity of the heart.

It can help assess heart rate and rhythm and may identify certain electrical abnormalities.

This can be particularly relevant when breathlessness occurs with palpitations, dizziness or fainting.

Blood Tests

Blood tests may be used to assess possible contributors to breathlessness.

Depending on the circumstances, these may include tests related to:

• Anaemia
• Kidney function
• Thyroid function
• Heart failure assessment
• Other medical conditions

The specific blood tests selected depend on the suspected cause.

Chest Imaging

A chest X-ray may be considered when doctors need information about the lungs, heart size or possible fluid within the chest.

Respiratory Assessment

If a lung-related cause is suspected, additional respiratory evaluation may be appropriate.

The tests selected should reflect the clinical question rather than assuming that breathlessness always requires a cardiac investigation.

What Happens During an Echocardiogram?

For a standard transthoracic echocardiogram, you will usually need to expose the chest area so that the ultrasound transducer can be positioned correctly.

Gel is placed on the skin to help the ultrasound probe obtain images.

You may be asked to lie on your side while images are taken from several positions on the chest.

During the examination, the test can assess:

• Heart chambers
• Heart-wall movement
• Heart valves
• Pumping function
• Blood-flow patterns

A routine transthoracic echocardiogram uses ultrasound and does not involve ionising radiation.

The examination may take around 30 to 45 minutes, although the duration can vary according to the clinical requirements.

Specific preparation is generally not required for a standard transthoracic echocardiogram unless the healthcare team gives different instructions.

Other forms of echocardiography, such as transoesophageal or stress echocardiography, involve different preparation and procedures and are selected for particular clinical questions.

Does Everyone With Shortness of Breath Need a Cardiac Echo Test?

No. Breathlessness is a symptom, not a diagnosis.

A person with mild breathlessness linked to a known respiratory condition may require a different form of assessment from someone who develops breathlessness during exertion together with ankle swelling and reduced activity tolerance.

Likewise, someone with anaemia may require assessment directed towards the underlying blood condition rather than cardiac imaging.

A cardiac echo test in Singapore may be considered when the clinical assessment raises concern about heart structure or function.

Factors that can influence this decision include:

• Pattern and duration of symptoms
• Physical examination findings
• Existing cardiovascular conditions
• Cardiovascular risk factors
• ECG findings
• Family history
• Previous cardiac investigations
• Other symptoms occurring alongside breathlessness

Testing is therefore individualised according to the clinical circumstances.

When Does Shortness of Breath Need Urgent Medical Attention?

Some forms of breathlessness should not wait for a routine cardiology appointment or scheduled echocardiogram.

Seek urgent medical attention when breathlessness:

• Starts suddenly and persists
• Is severe enough to interfere with speaking or walking a short distance
• Occurs with significant chest pain
• Is associated with a feeling of suffocation
• Occurs with fainting or loss of consciousness
• Is associated with bluish lips or fingertips
• Develops suddenly with severe dizziness or weakness

In Singapore, breathing difficulty or sudden shortness of breath can constitute a medical emergency.

Call 995 when symptoms indicate a life-threatening emergency rather than travelling to a clinic for a scheduled cardiac assessment.

What Information Should You Tell Your Cardiologist?

If the breathlessness is not an emergency but has become persistent or unexplained, keeping track of the symptoms can make the consultation clearer.

Be prepared to describe:

• When the breathlessness started
• Whether it began suddenly or gradually
• What activities trigger it
• How long episodes last
• Whether it happens at rest
• Whether lying down makes it difficult to breathe
• Whether it wakes you during sleep
• Whether your legs or ankles are swollen
• Whether you experience palpitations
• Whether chest discomfort occurs at the same time
• Whether you have dizziness or fainting
• Existing medical conditions
• Current medications
• Previous cardiovascular or respiratory diagnoses

Previous ECGs, blood tests, imaging reports or health-screening results may also provide useful context.

Shortness of breath can arise from conditions affecting the heart, lungs, blood or other aspects of health, which means an echocardiogram is not automatically required for everyone who becomes breathless.

A cardiac echo test may be considered when a doctor needs to assess heart structure, pumping function, chamber size, heart muscle movement or valve function. The findings can contribute to the assessment of conditions such as heart failure, valve disorders and certain heart muscle conditions when these are clinically suspected.

The decision to arrange an echocardiogram should therefore be based on the pattern of breathlessness, associated symptoms, medical history, examination findings and other relevant investigations.

Frequently Asked Questions

Can an echocardiogram show why I am short of breath?

An echocardiogram can identify certain cardiac findings that may help explain breathlessness, including problems involving heart pumping function, heart valves or cardiac structure. It cannot identify every possible cause, particularly conditions involving the lungs, blood or other body systems.

When might a cardiac echo test be considered for breathlessness?

A doctor may consider echocardiography when symptoms, examination findings, medical history or other test results suggest that heart structure or function needs assessment.

Can an echocardiogram diagnose heart failure?

An echocardiogram provides important information about heart structure and function and can support the assessment of suspected heart failure. Diagnosis also considers symptoms, examination findings and other investigations.

Is an echo test necessary if I am breathless only during exercise?

Not automatically. Breathlessness during exercise can have several causes. Whether an echocardiogram is appropriate depends on the degree of breathlessness, change from your usual exercise capacity, associated symptoms, medical history and findings from clinical assessment.

Does an echocardiogram use radiation?

A standard echocardiogram uses ultrasound waves and does not involve ionising radiation.

This article is for general information only and should not replace medical advice from a qualified healthcare professional.

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