The procedure, known as preventative angioplasty, has been shown to cut the risk of death and other serious complications by two thirds.
At present, patients undergo an emergency operation called an angioplasty immediately after the attack when doctors insert a thin tube – a stent – into the blocked artery to allow blood to flow through.
During surgery they often discover that other arteries are partly blocked, which could cause another heart attack in the future.
Although NHS guidelines tell doctors to treat only the artery which caused the attack, some experts have been inserting stents into other high-risk vessels in the hope of preventing future problems.
Because each procedure can trigger bleeding, strokes or another heart attack, and incurs an extra cost, many doctors do not believe it is worth it.
Saving money and lives: Doctors believe the surgery should be adopted routinely because it could save millions of pounds
It costs the NHS around £700 to carry out the procedure on one artery, which includes general aesthetic, so having additional blood vessels repaired at the same time will not be significantly more expensive.