Your father mentions a "tightness" while climbing the stairs at the railway station. Your office health check-up comes back with a line nobody explained: "Non-specific ST-T changes. Clinical correlation advised." Or a cardiologist hands your mother three slips (ECG, 2D Echo, TMT) and the family spends the evening on WhatsApp trying to work out what each one is for.
This World Heart Day (29 September), it is worth understanding these tests. Heart disease and stroke together caused about 28% of all deaths in India in 2016, nearly double their share in 1990, according to the ICMR-backed India State-Level Disease Burden Initiative. The INTERHEART study found that South Asians have their first heart attack at a median age of about 52 years, roughly ten years earlier than Europeans. That is why the ECG, 2D Echo and TMT are among the most commonly ordered heart tests in India, and why knowing how to read their reports can help you ask better questions at your next appointment.
ECG, 2D Echo and TMT: Three Heart Tests, Three Different Questions
These are not "better" or "worse" versions of the same test. Each answers a different question about your heart.
| Feature | ECG (Electrocardiogram) | 2D Echo (Echocardiogram) | TMT (Treadmill Test) |
|---|---|---|---|
| What it looks at | The heart's electrical activity | The heart's structure and pumping | How the heart copes under exercise stress |
| How it works | 10 electrodes on chest and limbs | Ultrasound probe on the chest | ECG recorded while you walk on a treadmill |
| Time taken | 5–10 minutes | 20–45 minutes | 30–45 minutes (8–12 minutes of walking) |
| Best at detecting | Rhythm problems, past or ongoing heart attack patterns, conduction blocks, thickened heart muscle | Weak pumping (low ejection fraction), valve disease, enlarged chambers, fluid around the heart, congenital defects | Blockages that only cause trouble during exertion (inducible ischaemia), exercise capacity |
| Main limitation | A normal resting ECG does not rule out blocked arteries | Does not directly show coronary artery blockages | Less accurate in women; cannot be done if you are unable to walk briskly |
In simple terms, the ECG checks the wiring, the 2D Echo checks the pump and valves, and the TMT checks whether the fuel supply holds up when the heart is asked to work harder. A normal ECG and a normal echo can coexist with significant coronary blockages, because blockages often reduce blood flow only during exertion, which is what the TMT is designed to reveal.
In an emergency, doctors combine the ECG with blood tests such as troponin. Chest pain lasting more than a few minutes needs the nearest emergency department, not a scheduled test.
How to Read Your ECG Report
A 12-lead ECG printout usually has machine-generated numbers at the top and, ideally, a doctor's interpretation at the bottom.
ECG Normal Values
| Parameter | Normal Range (Adults) | What It Reflects |
|---|---|---|
| Heart rate | 60–100 beats per minute | Below 60 is bradycardia (common and often normal in fit people); above 100 is tachycardia |
| PR interval | 120–200 ms | Time for the signal to travel from the upper to lower chambers; over 200 ms is a first-degree AV block |
| QRS duration | Under 120 ms (usually 80–100 ms) | Time for the lower chambers to activate; 120 ms or more suggests a bundle branch block |
| QTc (corrected QT) | Up to about 450 ms in men, 460–470 ms in women | Time for the ventricles to recharge; prolonged QTc can be caused by some medicines and low potassium or magnesium |
| QRS axis | Roughly –30° to +90° | Overall direction of electrical flow; left or right axis deviation is noted if outside this |
Common Terms on Indian ECG Reports
- Normal sinus rhythm (NSR): The heartbeat starts from its natural pacemaker at a normal rate. This is what you want to see.
- Sinus bradycardia / tachycardia: Normal rhythm, but slow or fast. Fever, anxiety, anaemia, thyroid problems and dehydration commonly cause a fast rate.
- LVH (left ventricular hypertrophy): Voltage patterns suggesting thickened heart muscle, often linked to long-standing high blood pressure. An ECG is not very accurate for this, so an echo is usually advised to confirm it.
- RBBB / LBBB (right or left bundle branch block): A delay in one of the heart's conduction pathways. An isolated RBBB is often seen in healthy people. A new LBBB always needs a cardiologist's evaluation.
- T-wave inversion / ST depression / ST elevation: Changes in the recovery phase of the heartbeat. They can point to reduced blood supply, but they also have many harmless causes.
- "Non-specific ST-T changes": Probably the most anxiety-inducing phrase on Indian check-up reports. It means small deviations that do not fit any specific disease pattern. Anxiety, a heavy meal, low potassium, certain medicines and normal variation can all cause them.
- "Borderline ECG" / "Abnormal ECG – unconfirmed": Automated labels from the ECG machine's software, which often over-calls abnormalities. The final interpretation should come from a doctor who has seen you.
The most useful thing you can bring to a cardiologist is your old ECG: an abnormality unchanged for five years means something very different from one that appeared last week. Storing every ECG in one place, for example by taking a clear photo and choosing to upload your reports to MedicalVault, makes that comparison possible even years later.
How to Read Your 2D Echo Report
A 2D Echo report is usually a page of measurements followed by a short "Impression". Read the impression first, then use the table below for the key numbers.
Key 2D Echo Measurements
| Parameter | Typical Normal Range (Adults) | What It Means |
|---|---|---|
| LVEF (left ventricular ejection fraction) | About 52–72% in men, 54–74% in women; most Indian reports call 55–70% "normal LV systolic function" | The percentage of blood the main pumping chamber pushes out with each beat |
| LVIDd (LV internal diameter in diastole) | About 42–58 mm in men, 38–52 mm in women | Size of the main pumping chamber; larger values suggest dilatation |
| IVS / LVPW thickness | About 6–10 mm in men, 6–9 mm in women | Wall thickness; higher values suggest LVH (often from hypertension) |
| LA (left atrium) size | Up to about 40 mm (diameter) | Enlargement can be linked to raised pressures, valve disease or atrial fibrillation |
| PASP (pulmonary artery systolic pressure) | Below about 35 mmHg | Pressure in the lung arteries; higher values suggest pulmonary hypertension |
Measurement cut-offs vary slightly between labs and are adjusted for body size, so always check the ranges printed on your own report.
Understanding Ejection Fraction
The LVEF is the number most people focus on, and it is central to how doctors classify heart failure:
| LVEF | Classification |
|---|---|
| 50% and above | Preserved ejection fraction (heart failure can still exist if the heart is stiff; this is called HFpEF) |
| 41–49% | Mildly reduced ejection fraction (HFmrEF) |
| 40% or below | Reduced ejection fraction (HFrEF) |
An LVEF of 60% does not mean your heart is working at "60% capacity". A healthy heart never pushes out all its blood, so 55–70% is the expected range.
Common 2D Echo Report Terms
- RWMA (regional wall motion abnormality): A segment of heart muscle that is not moving normally. It is often seen after a heart attack or with significant blockage. "No RWMA" is reassuring.
- Diastolic dysfunction (Grade I / II / III): The heart muscle relaxes less efficiently between beats. Grade I ("impaired relaxation") is very common after 60 and in people with hypertension or diabetes, and is usually managed by controlling those conditions. Grades II and III indicate raised filling pressures and need closer follow-up.
- Trivial / trace / mild MR, TR, AR, PR: A small backward leak through the mitral, tricuspid, aortic or pulmonary valves. Trivial and mild leaks are found in a large share of healthy adults and are usually of no consequence. Moderate and severe regurgitation, or stenosis (narrowing), need specialist follow-up.
- RHD (rheumatic heart disease): Valve damage from childhood rheumatic fever. It is still seen in India, most often affecting the mitral valve.
- No clot / vegetation / pericardial effusion; IAS / IVS intact: No clot inside the heart, no valve infection, no fluid around the heart and no hole between chambers.
Ejection fraction and valve leaks are tracked across years, and your cardiologist will want to know whether your LVEF is stable, improving or falling. MedicalVault's trend analysis helps you follow values like these over time instead of digging through a folder of old printouts.
TMT (Treadmill Stress Test): What a "Positive" or "Negative" Result Means
The TMT, or exercise stress test, records your ECG and blood pressure while you walk on a treadmill that gets progressively faster and steeper. Most Indian centres use the Bruce protocol, which has stages of three minutes each. The goal is to push the heart close to its working limit, because blockages in the coronary arteries often show up only when the heart muscle's demand for oxygen rises.
Key TMT Terms
| Term | What It Means |
|---|---|
| Target heart rate (THR) | Usually 85% of your maximum predicted heart rate, calculated as (220 – age). For a 50-year-old: (220 – 50) × 0.85 ≈ 145 bpm |
| METs (metabolic equivalents) | A measure of exercise capacity. Achieving 10 METs or more is associated with a good outlook; under 5 METs suggests poor fitness |
| Exercise duration | Total minutes completed on the Bruce protocol. Longer duration generally means better fitness and prognosis |
| Duke Treadmill Score | Exercise time – (5 × max ST deviation in mm) – (4 × angina index). Scores of +5 or higher suggest low risk, –10 to +4 intermediate risk, and –11 or lower high risk |
| Blood pressure response | BP should rise with exercise. A drop in BP during exercise is a warning sign |
Reading the Result
- Negative for inducible ischaemia: You reached your target heart rate without significant ECG changes or symptoms. This is reassuring, though not a guarantee.
- Positive for inducible ischaemia: The ECG showed significant ST-segment depression (typically 1 mm or more, horizontal or downsloping) during or after exercise, sometimes with chest discomfort. This suggests reduced blood flow during exertion and usually leads to further testing.
- Inconclusive / non-diagnostic / "target heart rate not achieved": You stopped early because of fatigue, knee pain or breathlessness before reaching the target, or the baseline ECG made interpretation unreliable. This is common, and your doctor may suggest a different test.
Limitations Worth Knowing
The TMT is a useful, inexpensive screening tool, but it is far from perfect:
- False positives are more common in women, as well as in people with LVH, mitral valve prolapse, low potassium, or those taking digoxin.
- A pre-existing LBBB, pacemaker rhythm or WPW pattern on the resting ECG makes TMT results uninterpretable.
- It can miss blockages (false negatives), especially if the target heart rate is not reached or if you are on beta-blockers.
- It is not safe after a very recent heart attack, with unstable chest pain, severe aortic stenosis, uncontrolled arrhythmias, acute myocarditis, or uncontrolled blood pressure. Your cardiologist screens for these before the test.
Preparing for Heart Tests in India: Tips, Costs and What Comes Next
Practical Preparation Tips
For an ECG:
- No fasting is needed.
- Wear a two-piece outfit (kurta and pants, shirt and trousers) so the chest is easy to access. A saree can make lead placement awkward.
- Skip body oil or moisturiser on the chest that morning, as it stops the electrodes from sticking.
- Lie still; talking or shivering creates "artefact" that can mimic an abnormality.
For a 2D Echo:
- A standard transthoracic echo needs no fasting and no special preparation.
- A TEE (transoesophageal echo), where the probe is passed down the food pipe, requires 4–6 hours of fasting and light sedation, so someone should accompany you home.
For a TMT:
- Eat a light meal (idli, toast or fruit) 2–3 hours before. Do not go on an empty stomach, and avoid a heavy thali.
- Avoid tea, coffee and smoking on the morning of the test.
- Wear sports shoes, not chappals or formal shoes, and comfortable clothes you can walk briskly in.
- Ask your doctor about medicines. Beta-blockers (such as metoprolol or atenolol) blunt the heart rate response, and some cardiologists ask patients to pause them for 24–48 hours. Never stop any heart medicine on your own.
- Tell the technician about knee pain, back problems or any recent chest pain before you start.
Approximate Costs in India
| Test | Approximate Cost (₹) |
|---|---|
| ECG (12-lead, resting) | ₹200 – ₹500 |
| 2D Echo (transthoracic) | ₹1,500 – ₹3,500 (up to about ₹4,000 in metro corporate hospitals) |
| TMT (treadmill test) | ₹1,000 – ₹3,000 |
| Holter monitoring (24–48 hours) | ₹2,000 – ₹4,500 |
| Stress echo (exercise or dobutamine) | ₹3,000 – ₹7,000 |
| CT coronary angiogram (CTCA) | ₹6,000 – ₹15,000 |
Prices vary by city, hospital and package. Government hospitals and CGHS centres charge much less, and many preventive "cardiac packages" from diagnostic chains bundle ECG, echo, TMT and a lipid profile at a discount.
When Your Doctor Orders More
The ECG, echo and TMT are often the first step. Depending on your results and symptoms, your cardiologist may add:
- Holter monitor: A portable ECG worn for 24–48 hours (or longer patch monitors) to catch palpitations, fainting spells or irregular rhythms such as atrial fibrillation that a 10-second ECG misses.
- Stress echo or nuclear stress test: More accurate than TMT, particularly for women, people with an abnormal baseline ECG, or those who cannot walk on a treadmill (a medicine such as dobutamine stresses the heart instead).
- CT coronary angiogram or calcium score: A non-invasive CT scan that shows plaque and narrowing in the coronary arteries directly. Our coronary calcium score guide explains when it is useful.
- Invasive coronary angiography: The catheter test that confirms blockages and allows stenting in the same sitting.
Which test comes next depends on your age, symptoms, risk factors and earlier results, so discuss the options with your cardiologist. If you manage a parent's heart care from another city, the family sharing feature lets siblings and caregivers see the same ECGs and echo reports before a consultation.
Key Takeaways
- The ECG, 2D Echo and TMT answer different questions: the ECG checks the heart's electrical rhythm, the echo checks its structure and pumping, and the TMT checks for blockages that appear only during exertion.
- Normal ECG values include a heart rate of 60–100 bpm, a PR interval of 120–200 ms, a QRS under 120 ms and a QTc up to about 450 ms (men) or 460–470 ms (women). Phrases like "non-specific ST-T changes" need a doctor's interpretation, not panic.
- An LVEF of roughly 55–70% is normal. Trivial valve leaks and Grade I diastolic dysfunction are common findings that usually need monitoring rather than alarm.
- A positive TMT suggests, but does not confirm, blockages. False positives are more frequent in women, and further tests such as stress echo or CT coronary angiography are often used to clarify results.
- Prepare sensibly: wear two-piece clothing for an ECG, eat a light meal and wear sports shoes for a TMT, and never stop heart medicines without your cardiologist's advice.
- Heart disease strikes Indians about a decade earlier than Western populations, so this World Heart Day is a good time to discuss with your doctor whether these tests suit you or your parents.
- Old reports make new ones meaningful. Keeping every ECG and echo in one place on MedicalVault lets your cardiologist see how your heart has changed over time. Explore the features page to get started.