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ECG (Electrocardiogram): A Complete Guide to Heart’s Electrical Activity
An ECG records the electrical signal that makes your heart beat. Ten electrodes, five to ten minutes, nothing enters your body and nothing hurts. Our list price is ₹ 400 and the report is available the same day.
An Electrocardiogram, commonly known as ECG or EKG, is one of the most widely used tests in cardiology. It records the electrical activity of the heart and helps doctors detect various heart-related conditions. Whether you are experiencing chest pain, palpitations, or simply going for a routine health check-up, an ECG is often the first test prescribed.
If you have chest pain right now, do not book a test — go to a hospital emergency department. An ECG is the right first step for symptoms you have been having for a while; chest pain or pressure happening at this moment needs a doctor within minutes, not an appointment.
How Does an ECG Work?
The heart functions through tiny electrical impulses that cause it to contract and pump blood. An ECG machine detects these impulses using electrodes placed on the skin, usually on the chest, arms, and legs. These signals are then recorded on graph paper or displayed digitally as waveforms.
The result is a pattern of spikes and dips, which reflects how your heart is beating. Each wave corresponds to a specific activity in the cardiac cycle:
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P Wave – Atrial contraction
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QRS Complex – Ventricular contraction
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T Wave – Ventricular recovery
The machine only listens. No current is passed into you, nothing is injected, and there is no radiation — the electrodes simply pick up the voltage your own heart is already producing, in the same way a microphone picks up sound.
Types of ECG Tests
Different types of ECGs are used depending on the patient’s condition:
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Resting ECG – Done while the patient is lying still.
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Stress ECG (Exercise Test) – Performed while the patient exercises on a treadmill or stationary bike.
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Holter Monitoring – Continuous ECG recording for 24–48 hours.
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Event Recorder – Used for longer monitoring when symptoms occur occasionally.
Why is an ECG Done?
Doctors recommend ECG for several reasons, such as:
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Chest pain or suspected heart attack
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Palpitations or irregular heartbeat
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Shortness of breath or dizziness
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Pre-surgery check-ups
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Routine screening for people with high blood pressure, diabetes, or family history of heart disease
Conditions Diagnosed with ECG
An ECG can reveal a wide range of heart conditions, including:
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Arrhythmias (irregular heartbeat)
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Heart Attack (Myocardial Infarction)
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Coronary Artery Disease (poor blood supply to the heart)
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Enlarged Heart (Hypertrophy)
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Electrolyte Imbalances (abnormal potassium or calcium levels)
How to Prepare for an ECG?
Preparing for an ECG is simple:
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Wear comfortable, loose clothing.
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Avoid oily skin lotions or creams before the test.
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You can eat and drink normally unless advised otherwise.
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Remove jewelry or metallic objects that may interfere with electrodes.
The procedure is quick, painless, and takes about 5–10 minutes.
One small thing nobody warns you about: for chest electrodes to stick properly, a patch of chest hair is sometimes trimmed. It is a few seconds with a razor, and it is the only part of an ECG anyone finds inconvenient.
Risks and Limitations
ECG is a safe, non-invasive, and painless test with no risks. However, it has some limitations:
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It may not detect heart problems that occur intermittently.
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Sometimes additional tests (Echocardiogram, Angiography, Stress Test) are required for accurate diagnosis.
The limitation worth understanding is this: an ECG is a ten-second snapshot. If your palpitations come once a week, a resting ECG taken on a calm afternoon will very likely look normal — and a normal ECG in that situation does not mean nothing is wrong. That is exactly why Holter monitoring and stress testing exist.
Advancements in ECG Technology
Modern technology has made ECG testing more advanced and accessible:
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Digital ECG Machines provide instant results.
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Portable ECG Devices allow home monitoring.
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Smartwatches with ECG Features can detect irregular heart rhythms on the go.
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AI-based ECG Interpretation improves diagnostic accuracy.
A word of caution on the last two. A smartwatch records a single lead; a clinical ECG records twelve leads, which is why a watch can flag an irregular rhythm but cannot show a heart attack, and why a watch alert should be taken to a doctor rather than treated as a diagnosis or as a reason to panic.
ECG vs. Other Heart Tests
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ECG vs. Echocardiogram – ECG records electrical activity, while an Echo shows heart structure and movement.
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ECG vs. Stress Test – ECG at rest vs. ECG during exercise.
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ECG vs. Angiography – ECG detects electrical issues, while angiography visualizes blood vessels.
Cost and Accessibility
The cost of an ECG in Delhi varies by hospital and location, usually ranging from ₹200 to ₹1,000 in India. Many clinics and diagnostic centers provide same-day reports. In urban areas, ECG is easily available, while portable ECG machines are bridging the gap in rural healthcare.
Our price
| Test | Price (MRP) | |
|---|---|---|
| ECG — ElectrocardiogramAt Edge Imaging & Diagnostics, West Delhi. Walk in; report the same day. | ₹ 400 | Book now |
Want today’s exact price?
This is our list price (MRP) and rates are revised from time to time.
Send a photo of your prescription on WhatsApp and we will confirm today’s rate and the earliest slot — or simply walk in, an ECG does not need an appointment.
ECG — common questions
What is an ECG and what does it show?
An ECG (electrocardiogram, also written EKG) is a recording of the electrical activity of the heart. Electrodes on the chest, arms and legs pick up the voltage your heart produces with every beat, and the machine draws it as a line of waves. It shows the rhythm and rate, evidence of a past or ongoing heart attack, an enlarged heart, conduction blocks and some electrolyte problems.
What does “normal sinus rhythm” on an ECG report mean?
It means the heartbeat is starting in the right place — the sinus node, the heart’s natural pacemaker — and travelling through the heart in the normal order, at a normal rate. In plain terms it is the reassuring line on the report. It describes the rhythm only; a heart can be in normal sinus rhythm and still have other findings elsewhere on the tracing, which is why the whole report matters, not one phrase.
Can an ECG be done at home?
Portable devices and some smartwatches can record an ECG at home, but they usually record one lead. A clinical ECG records twelve leads, looking at the heart from twelve directions, which is what allows a heart attack or a conduction block to be located. A home or watch tracing is useful for catching an irregular rhythm as it happens — take it to your doctor, but do not treat it as a diagnosis.
Does an ECG hurt, and is there any radiation?
No to both. Nothing enters your body, no current is passed into you and there is no radiation at all — the machine only listens to the electricity your own heart is already making. The sticky electrodes come off like a plaster; that is the extent of it.
How long does an ECG take and when do I get the report?
About 5 to 10 minutes in total, and the actual recording is around ten seconds. The report is available the same day.
What is the difference between an ECG and an Echo?
An ECG records the heart’s electrical activity as a tracing. An echocardiogram is an ultrasound that shows the heart’s structure and movement — chamber sizes, valves, wall motion and pumping function. They answer different questions and doctors often ask for both together.
How much does an ECG cost in Delhi?
Across India an ECG generally costs between ₹200 and ₹1,000 depending on the centre. At Edge Imaging our list price (MRP) is ₹ 400, with the report available the same day and no appointment needed. Rates are revised from time to time, so message us on 9555999960 to confirm today’s rate.
My ECG was normal but I still have symptoms. What now?
A resting ECG is a ten-second snapshot, so a problem that comes and goes can easily be missed. If palpitations, giddiness or chest discomfort continue, tell your doctor — the usual next steps are Holter monitoring, which records every beat for 24 hours or longer, a treadmill stress test, or an echocardiogram, depending on what your doctor suspects.
An ECG is a simple, safe, and highly effective test that provides valuable insights into your heart’s health. If you experience chest pain, irregular heartbeat, or other cardiac symptoms, don’t ignore them—consult a doctor and get your ECG done on time. Regular heart check-ups can help in early detection and prevention of serious conditions.
💓 Your heart deserves care—listen to its signals and act early!
Need an ECG? Walk in to any of our three West Delhi centres — no appointment needed, ₹ 400, report the same day.