Prevention Efforts Have Reduced Lead Poisoning
WebMD News Archive
Nov. 12, 1999 (Atlanta) -- The incidence of
lead poisoning has decreased dramatically over the last twenty years due to
universal screening and education, according to a report in the November issue
of Pediatrics. As more selective testing, instead of universal testing,
becomes the norm, doctors say thorough patient histories will be needed to
identify lead exposure.
"Over the past two decades, blood
levels of lead have dropped substantially among children in the United States.
Paint, dust, soil, and water remain the principal sources," says William
Schaffner, MD, professor and chairman of the department of preventive medicine
at Vanderbilt University in Nashville. "Now that these well-recognized
sources are being eliminated, it's time to focus on more obscure sources of
Some unusual sources of lead toxicity
mentioned in the report include folk medicines, calcium supplements from
bonemeal, contaminated flour and food coloring from the Middle East, candy
packaged in jars from South America, as well as pottery and metal cookware from
around the world. Ingestion of lead-based foreign objects including buttons and
curtain weights also was reported. Schaffner tells WebMD, "once identified,
all potential sources of exposure should be removed because lead poisoning is a
chronic disorder that may have irreversible effects."
Chronic lead poisoning can lead to learning
disabilities, mental retardation, kidney disease, and eventual death in
children. Adults may additionally suffer from heart disease and stroke. In
terms of signs and symptoms, Schaffner says, "children are likely to have a
rapid onset of forceful vomiting and seizures. Adults are likely to report
headache, abdominal pain, vomiting, and constipation over several weeks. Of
course, lead levels can also be quite high with virtually no symptoms at all.
In fact, we referenced two such cases."
In one case, a baby was found to have a
high blood lead level (BLL) upon routine screening. Subsequent evaluation of
the child's home environment identified no obvious sources, although discussion
with parents revealed daily application of surma. Also known as kohl, surma is
a fine black powder applied to the eyelids for cosmetic and medicinal purposes
throughout Asia. The powder, found to be 25% lead, was discontinued and the
child's BLL dropped by almost half within eight weeks.