NEW evidence shows that aspirin could save more than 7000 lives a year

in the UK and 100,000 worldwide through its ability to prevent blood

clots forming.

Results of international studies involving 140,000 patients in 300

clinical trials published today suggest long-term therapy should be

considered for almost everyone at risk of heart failure or a stroke.

Just half an aspirin a day can help people who have suffered heart

attacks or strokes.

Although doctors knew of the ability of aspirin to prevent blood

clots, the new evidence shows an even wider range of patients would be

helped, according to a report in the British Medical Journal.

Dr Rory Collins, British Heart Foundation senior research fellow and

co-director of the Clinical Trial Service Unit at Oxford, said: ''The

evidence of benefit is now clear for a wide range of people who are at

high risk of heart attack or stroke.

''We now know that aspirin works about as well for women as for men,

for the elderly as for the middle-aged, for those with high blood

pressure as well as those with normal blood pressure and in diabetics

and non-diabetics.''

Meanwhile, a team of scientists today warned that measuring

cholesterol levels should not be used as a method of screening for

future heart disease deaths.

They have found up to three-quarters of heart disease deaths in this

country would not have been predicted through cholesterol screening.

People could also receive false assurances from measuring their

cholesterol level.

The findings of the study, reported in The Lancet and carried out by

scientists from St Bartholemew's Hospital, London, working with

researchers in the United States, are based on a 12-year study of 21,500

men in the UK.

They conclude that cholesterol measurement is ''too unreliable'' to be

a satisfactory method of prediction.

The study showed tests cannot discriminate accurately enough for

doctors to recommend changes in lifestyle, diet, or possible life-long

drug therapy.

Most people in the UK have cholesterol levels that are too high.

Researchers found there was too little variation between people in the

UK, for screening to be effective in preventing heart disease.