Primary angioplasty is the emergency opening of a completely blocked coronary artery during a heart attack. Of everything in cardiology, this is among the interventions with the strongest evidence of benefit — and the one where delay is measured directly in lost heart muscle.
Why time is the whole treatment
In an ST-elevation myocardial infarction, a coronary artery has closed completely. The muscle it supplies begins to die within minutes and continues dying until flow is restored. Reopening the vessel quickly limits the size of the infarct, and infarct size drives everything that follows — survival, heart failure risk, rhythm problems, long-term capacity.
This is the clearest possible contrast with stable disease. In a stable patient, there is time to test, to think and to trial medical therapy. In an infarct there is not, and treating the two situations with the same caution would be a serious error.
What the procedure involves
A catheter is passed to the heart, usually through the artery at the wrist. Contrast identifies the blocked vessel, the obstruction is crossed with a fine wire, a balloon restores flow, and a stent is placed to hold the vessel open. In experienced hands the artery is typically open well within an hour of arrival.
Recovery is monitored, with attention to rhythm, pumping function and the medical therapy that begins immediately afterwards.
Recognising a heart attack
Chest pain or pressure lasting more than a few minutes; pain radiating to the arm, jaw, neck or back; breathlessness at rest; sweating, nausea or collapse. In women, in people with diabetes and in older patients the presentation is more often breathlessness or profound fatigue rather than classic chest pain, which is a common reason for dangerous delay.
If any of this is happening, call emergency services or go directly to the nearest emergency department. Do not drive yourself, and do not wait for an appointment.
After the procedure
What determines outcome over the following years is not the stent but what follows it: dual antiplatelet therapy for the prescribed duration, lipid lowering to target, blood pressure and glucose control, cardiac rehabilitation, and tobacco cessation. Secondary prevention after a heart attack is consistently under-delivered relative to the attention given to the procedure itself.
Written and medically reviewed by Dr. Gurbir Singh Gill — Interventional Cardiologist & Diabetologist, Oxford Hospital.
Last reviewed: 1 September 2026