Drugs and surgery can help to control coronary heart disease.
Statins are drugs that help to lower cholesterol in the blood. They do this by lowering its production in the liver.
Statins are prescribed for people with heart disease or who have a high risk of developing it. They need to be taken long-term. Cholesterol levels will rise again if a person stops taking them.
Some studies have raised concerns regarding the side effects of statin use, while others believe they can bring additional positive benefits.
Statins are not suitable for everyone - they should not be prescribed for people with liver disease, or pregnant or breast feeding women.
Some patients taking statins often experience side-effects such as headaches and memory loss. There have been reports of statins being linked with type 2 diabetes and liver damage.
Other people argue that statins should be used more widely. They may protect against other conditions such as Alzheimer's disease, but further research is needed.
Coronary arteries that are blocked or have become narrow can be stretched open and a stent inserted to restore and maintain blood flow.
They can be used in instances where drugs are less effective, and offer a longer term solution. Stents are made from metal alloys and do not lead to an immune response in the patient.
Around 75 000 operations are carried out each year. Risk factors depend on the patient's:
The operation is safe as it does not involve surgery, but there is a risk of bleeding, heart attack or stroke.