Low lead levels 'still harmful'

[n2doc]

Low lead levels 'still harmful'


Lead may raise the risk of death from many causes at levels much lower than those widely thought to be safe, researchers suggest. The World Health Organization recommends children should not be exposed to blood levels of more than 100 microgram/litre. But US scientists found increased risks at levels up to five times lower. The Tulane University findings, in the journal Circulation, suggest the safety limits should be reassessed.



The researchers examined data on 13,946 adults whose blood lead levels were measured between 1988 and 1994. They also looked at death rates and cause of death for this group up to the end of 2000. They found that the risk of death from all causes, and cardiovascular disease, increased progressively at higher lead levels.

Compared to people with a blood lead level below 19 micrograms/litre, those with a level of between 36 and 100 micrograms/litre had:


A 25% higher risk of death from any cause

A 55% higher risk of death from cardiovascular diseases

An 89% higher risk of death from heart attack

Two-and-a-half times the risk of death from stroke

Chief researcher Dr Paul Muntner said the study also found evidence that lead blood levels as low as 20 micrograms/litre were associated with a raised risk of cardiovascular death.


more:
http://news.bbc.co.uk/2/hi/health/5355466.stm

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