The first few hours after a heart attack are extremely important because the longer the blood supply to the heart remains blocked, the greater the risk of permanent heart muscle damage.
1. What happens during a heart attack?
A heart attack usually occurs when a blood clot blocks a coronary artery, preventing oxygen-rich blood from reaching part of the heart muscle.
- Within minutes: Heart muscle cells begin suffering from a lack of oxygen.
- As time passes: More heart tissue may become permanently damaged.
- Without timely treatment: The risk of heart failure, dangerous heart rhythms and death can increase.
This is why doctors say, “Time is muscle.”
2. Why are the first 2–3 hours so important?
Early treatment can save heart muscle. Quickly restoring blood flow can limit permanent damage and improve the chances of recovery.
Angioplasty, also called PCI, is a procedure in which doctors use a thin catheter and a small balloon to open a blocked coronary artery. A stent is usually placed to help keep the artery open.
The earlier an eligible patient receives treatment, the better the opportunity to preserve heart function. However, treatment is still urgent even if several hours have already passed.
3. How costly can delaying angioplasty prove to be?
The consequences can extend beyond immediate survival:
- Permanent heart damage: More heart muscle may die when blood flow is not restored.
- Heart failure: Extensive damage can weaken the heart’s pumping ability.
- Dangerous complications: The risk of life-threatening abnormal heart rhythms may increase.
- Longer recovery: The patient may require prolonged hospital care, medication and cardiac rehabilitation.
- Higher long-term expenses: Complications can lead to additional treatment and ongoing medical costs.
A 2025 American College of Cardiology/American Heart Association guideline reports that, among patients with STEMI treated with primary angioplasty, each 30-minute treatment delay is associated with a 7.5% increase in the relative risk of death at one year. This is a relative increase, not a 7.5-percentage-point increase in every patient’s absolute risk.
4. What should you do if a heart attack is suspected?
- Call emergency services immediately. In India, dial 112 or your local ambulance service.
- Do not wait for symptoms to disappear or attempt to treat them with home remedies.
- Reach a hospital capable of providing emergency cardiac care.
- Follow medical advice; doctors will determine whether angioplasty or another treatment is appropriate.
Warning signs include chest pressure or pain, pain spreading to the arm, back or jaw, shortness of breath, cold sweating, nausea and sudden weakness. Some people, particularly older adults and people with diabetes, may have less typical symptoms.
The key message: The first 2–3 hours are especially important, but there is no point at which a person should assume treatment is too late. Every suspected heart attack requires immediate medical attention.
