Ecg Test

Overview

An ECG (say "ee-see-jee") is short for electrocardiogram. The word means "electrical heart picture." It is a quick, painless test that records the electrical signals your heart makes with every beat. Small sticky patches are placed on your chest, arms and legs, and thin wires connect them to a machine. The machine draws a wavy line on paper or a screen. That line tells your doctor how fast your heart is beating, whether the rhythm is steady, and whether the different parts of your heart are working together in the right order. An ECG only listens to your heart. It does not send electricity into your body, and nothing goes inside you.

Very common. The ECG is one of the most widely used tests in medicine. Millions are done every year, in clinics, hospitals, ambulances and even in people's homes. If your doctor suggests one, you are in very ordinary company.

Anyone can have an ECG, from newborn babies to people in their nineties. It is most often done in adults who have chest pain, a racing or fluttering heartbeat, or who are about to have surgery. Children usually only have one if a doctor suspects a heart rhythm problem, a heart condition they were born with, or if there is a family history of heart trouble.

Symptoms

Common symptoms

• Chest pain, tightness, pressure or heaviness
• A heartbeat that feels fast, fluttering, thumping or uneven (this is called palpitations)
• Feeling short of breath, especially with activity
• Feeling lightheaded, dizzy or faint
• Fainting or nearly fainting
• Unusual tiredness or weakness with everyday tasks
• Swelling in the ankles or legs
• A check-up before surgery or before starting a new medicine
• A strong family history of heart problems or sudden cardiac death at a young age

Symptoms in children

• Fainting during exercise or after being startled
• A heartbeat that races or feels irregular, which a child may describe as "my heart is jumping"
• Chest pain with exercise (this is usually not heart-related in children, but it is checked)
• Blue or grey lips or skin, especially in babies
• Poor feeding or sweating in a baby during feeds
• A known heart condition present from birth, or a family history of heart rhythm problems

Symptoms in older adults

• Breathlessness or tiredness that has crept up slowly
• Dizziness on standing up
• An irregular pulse noticed at a routine check
• Blackouts or falls with no clear cause
• Chest discomfort that comes on with walking and eases with rest
• An ECG is also often done before surgery, or to check how a medicine is affecting the heart

Causes

Main causes

• An ECG is a test, not an illness, so there is no single cause. Doctors use it to look into many different things.
• Chest pain or suspected heart attack — to see if the heart muscle is short of blood
• Palpitations or an irregular pulse — to identify the rhythm problem, such as atrial fibrillation (an uneven heartbeat)
• Breathlessness or swelling — to look for signs of heart strain or heart failure (when the heart pumps less well)
• Fainting or blackouts — to check whether the heart rhythm is the cause
• Medicines — some heart medicines need an ECG to check they are working safely
• Before surgery or a procedure, as a general heart check
• Body salt imbalances, thyroid problems or heavy alcohol use, which can disturb the heart rhythm
• A family history of inherited heart conditions

Risk factors

• High blood pressure
• Diabetes
• High cholesterol
• Smoking
• Being physically inactive
• Carrying extra weight around the middle
• A family history of heart disease or sudden cardiac death at a young age
• Getting older — the risk of heart rhythm problems rises with age
• Heavy alcohol use or use of stimulant drugs
• Some medical conditions, such as thyroid disease or sleep apnoea (pauses in breathing during sleep)

When to see a doctor

See a doctor urgently if:

• You have new palpitations that keep returning
• You have fainted or nearly fainted, and have now recovered
• You have chest discomfort that comes on with activity and eases with rest
• You feel breathless doing things that used to be easy
• You notice swelling in your ankles or legs that does not go away overnight
• You have a known heart condition and your usual symptoms change

Book a routine appointment if:

• You want to talk about whether an ECG is right for you
• You have a strong family history of heart problems and want advice
• You are starting or changing a medicine that can affect the heart
• You are preparing for surgery and have been asked to have a heart check
• You have questions about ECG results you have already been given

Diagnosis

An ECG is the test itself, so there is nothing to "diagnose" before it. Your doctor will ask about your symptoms, your medicines, your family history and your lifestyle, then decide which type of ECG is most useful. For a resting ECG, you lie on a couch and a technician or nurse places about 10 sticky patches on your chest, arms and legs. Wires clip onto the patches and the machine records for a few seconds. You need to lie still and breathe normally. Sometimes you are asked to hold your breath for a moment. The whole thing is over in about 10 minutes, and you can drive home and go back to work afterwards.

Tests that may be done

• Resting ECG — the standard 10-minute recording in a clinic or hospital
• Ambulatory ECG (Holter monitor) — a small portable recorder you wear for 24 to 48 hours, which catches irregular beats that come and go
• Event recorder — a device you wear for longer and press when you feel symptoms
• Exercise ECG or stress test — a recording taken while you walk on a treadmill or pedal a bike, to see how your heart copes with effort
• Blood tests — to check for signs of heart muscle strain, salts, kidney function or thyroid problems
• Echocardiogram — a painless ultrasound scan that shows the heart's shape and how well it pumps
• Chest X-ray — to look at the size and shape of the heart and the lungs
• A heart monitor patch or smart device recording, if your doctor thinks it would help

What to expect at your appointment

No needles, no fasting and no special preparation are usually needed. Wear a top that is easy to lift, and avoid body lotion or cream on your chest on the day, because creams stop the patches sticking. You may need to shave a few small patches of chest hair. Some people feel a little self-conscious, but staff do this all day and will protect your privacy. Results are often ready the same day if the test is done in a clinic; a worn monitor takes a little longer to read. Your doctor will explain what the tracing shows and whether anything else is needed. Ask for a copy if you would like one for your records.

Treatment

An ECG does not treat anything by itself — it is an information test. What happens next depends entirely on what it shows. Many people have a normal ECG and need no treatment at all. Others find out they have an irregular heartbeat, a narrowed artery or another heart issue, and their doctor will discuss options with them. Whatever the result, you should be told clearly what it means, what happens next, and who to contact with questions.

Self-care at home

• Note down when your symptoms happen, how long they last and what you were doing — this helps your doctor read the ECG in context
• Keep taking your usual medicines unless your doctor tells you to stop
• Bring a list of all your medicines, including anything you bought over the counter, to your appointment
• Keep the skin on your chest clean and free of lotion before the test so the patches stick well
• Wear a loose top and trousers or a skirt, so you can stay covered up during the test
• If you are given a portable monitor, keep a simple diary of symptoms and the times they happened
• Ask for your results in plain words — it is fine to say "can you explain that again?"

Medical treatments

Treatment is planned around what the ECG finds, not around the ECG itself. If the rhythm is uneven or too fast, doctors may suggest medicines that steady the heartbeat, or a procedure to reset or control the rhythm. If the ECG suggests the heart muscle is under strain, the focus shifts to lowering blood pressure, treating high cholesterol and protecting the heart. If a heart attack is found, urgent hospital treatment is needed to restore blood flow. Some people need a small device fitted, such as a pacemaker (which keeps the heartbeat from going too slow), or a procedure to correct the heart's electrical pathways. Your doctor will explain the choices, the benefits and the downsides in a way that fits your situation. Never start, stop or change any medicine on your own.

When is surgery considered?

You will not need surgery for an ECG. Occasionally, though, the test finds something that is best treated with a procedure — for example, a narrowed artery that needs a small tube called a stent, or an electrical problem that needs a specialist procedure. These are only suggested when they are likely to help, and your doctor will talk them through with you first.

Living with this condition

Most people carry on with their normal day straight after an ECG. If you are given a portable monitor, you wear it under your clothes and go about your usual routine — just keep it dry and note any symptoms. Waiting for results can feel unsettling. It can help to write down your questions beforehand and to take someone with you to the appointment if you can.

Lifestyle tips

• Stay active — regular walking, swimming or cycling is good for the heart
• Cut down on salt and highly processed foods, which helps blood pressure
• Keep alcohol within recommended limits
• If you smoke, ask about stop-smoking support — it is the single biggest thing most people can do for their heart
• Try to keep to a healthy weight
• Get enough sleep, and tell your doctor if you snore heavily or feel exhausted in the mornings
• Manage stress where you can — gentle breathing, time outdoors, or talking to someone
• Know your own pulse — learning to check it can help you notice changes

Diet and exercise

A heart-friendly way of eating means plenty of vegetables, fruit, beans, whole grains, nuts and oily fish, with less salt, sugar and fried or processed food. You do not need to be perfect — small, steady changes last longer. For exercise, aim for something that makes you a little warm and slightly out of breath, most days if you can. If you have been told you have a heart condition, ask your doctor or nurse what level of activity is right for you before you push yourself hard.

Mental health and emotional wellbeing

It is very normal to feel anxious when you are having heart tests. Some people find their heart races simply because they are worried, which can make the wait harder. Palpitations themselves can also cause worry, and that worry can feed back into how you feel. Tell your doctor if fear or low mood is affecting your sleep or your daily life — this is a real part of your care, not a side issue. Talking therapies, relaxation techniques and support groups all help, and you do not have to cope alone.

Prevention

You cannot prevent needing an ECG — it is just a test, and it is often done as a routine check. What you can do is look after your heart so that fewer problems turn up in the first place: keep blood pressure and cholesterol in a healthy range, stay active, eat well, do not smoke, and keep alcohol within limits. If you have a family history of heart rhythm problems or sudden cardiac death at a young age, tell your doctor — they may suggest screening for you and your relatives.

Vaccines

There is no vaccine for heart rhythm problems. Keeping up to date with routine vaccinations, including flu and pneumonia vaccines if they are offered to you, helps protect people who already have a heart condition from becoming seriously unwell.

Screening programmes

There is no general screening programme that gives everyone an ECG. Instead, ECGs are offered when there is a reason: symptoms, a strong family history, a medicine that needs monitoring, or before surgery. Some sports organisations and employers arrange heart checks for particular groups. If you are unsure whether a check is worthwhile for you, ask your doctor.

Complications

If left untreated

• The ECG itself has no risks or complications — it does not use needles, radiation or electricity going into the body
• The important thing is what the ECG might find. If an irregular heartbeat such as atrial fibrillation is left unchecked, it raises the risk of a stroke over time
• An untreated heart rhythm problem can sometimes cause dizzy spells, falls or fainting
• If the heart is under strain and nothing is done, breathlessness and tiredness can slowly get worse
• That is why follow-up matters more than the test itself — going to results appointments and taking medicines as prescribed makes a real difference

Long-term outlook

Very reassuring for most people. The great majority of ECGs come back normal or show something minor that is easy to keep an eye on. Where a problem is found, modern heart care is good at managing it, and many people with a heart condition live full, active lives for decades. An ECG gives you and your doctor useful information early — which is exactly when it helps most.

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