HEALTH
REPORT - New Heart Attack Tests
By Nancy Steinbach
This is Phoebe Zimmermann with the VOA Special
English Health Report.
A new blood test could give doctors a better way to
tell if a person is in danger of a heart attack.
Researchers at the Cleveland Clinic in Cleveland,
Ohio, developed the experimental test. It measures the amount of an
enzyme（酶）produced by white blood cells.
This protein is called myeloperoxidase（髓过氧物酶）,
or M-P-O. M-P-O is present in the fatty material found on the arteries（动脉）of
people who die suddenly of a heart attack.
The researchers reported on their work in the New
England Journal of Medicine. They studied more than six-hundred people
over several months last year. All had arrived at the Emergency Room
of the Cleveland Clinic within twenty-four hours of the start of chest
pain.
The researchers found a link between high levels of
M-P-O and the chances that a person would suffer a heart attack within
six months. They also found that the M-P-O level in the blood correctly
told a person's risk of heart disease ninety-five percent of the time.
Researchers had known that M-P-O plays a part in hardening
of the arteries（动脉硬化）. They say the study is more proof of the
risks of inflammation（炎症）in
artery walls（动脉壁）. Inflammation loosens some of the fatty cholesterol（胆固醇）material
that attaches to the walls. The material can separate from the artery
and block the flow of blood to the heart or the brain. The M-P-O level
shows the amount of inflammation in arteries.
M-P-O is one of a number of substances being studied
as ways to find the probability of heart disease. German researchers
reported about a second one in the New England Journal of Medicine.
It is called glutathione peroxidase.
They measured levels of this molecule in the red blood
cells of people with suspected coronary（冠状的）artery
disease. They studied more than six-hundred people for about five years.
The study suggests that a low level of the molecule is a sign of a coming
heart attack.
New blood tests like these would add to the ways that
doctors decide what to do for patients with chest pain. The choice of
treatment could reduce the chances of a heart attack. The tests themselves
must be tested further. But the Cleveland researchers say their M-P-O
test could be ready for use within a year.
This VOA Special English Health Report was written
by Nancy Steinbach. This is Phoebe Zimmermann.
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