the VOA Special English Health Report.
is a loss of blood flow in the brain. There are two kinds of stroke. One is an
ischemic stroke. It happens when a blood vessel in the brain gets blocked. The
other kind is called a hemorrhagic, or bleeding, stroke. This happens when a
blood vessel breaks.
can cause death or disability. Bleeding strokes are more likely to kill than
ischemic strokes. But ischemic strokes are more common -- and doctors can treat
them with a drug that breaks up blood clots.
think someone is having a stroke, you should seek help immediately. Experts at
the United States National Institutes of Health say the treatment has to begin
within three hours. But they say people need to get to the hospital within one
hour so doctors have time to examine them.
Usually the warning signs appear suddenly.
These include trouble walking, weakness especially on one side of the body,
difficulty seeing and difficulty speaking.
recent study showed that seemingly healthy middle-aged people can suffer a
stroke without immediately knowing it. The study involved about two thousand
people. They were the children of men and women who took part in a major
research project in Massachusetts called the Framingham Heart Study.
average age in the new study was sixty-two. The people were examined every four
to eight years. They were given M.R.I., magnetic resonance imaging, tests to
inspect for damaged brain tissue and signs of stroke.
imaging showed that nearly eleven percent of those with no reported stroke had
suffered a silent cerebral infarction, or silent stroke. Silent strokes are
brain injuries likely caused by a blockage that limits blood supply to the
The researchers reported a link between silent stroke
and a condition called atrial fibrillation. Atrial fibrillation is the most
common cause of abnormal heartbeat in older adults.
Sudha Seshadri at the Boston University School of
Medicine says atrial fibrillation more than doubled the risk of a stroke.
Doctor Seshadri says the findings show the need for early testing and treatment
of conditions that could lead to heart disease.
The study appeared in Stroke, a journal of the American
risk factors for a silent stroke are high blood pressure, heart disease,
diabetes and tobacco use.
that's the VOA Special English Health Report. For more health news, go to
voaspecialenglish.com. I'm Steve Ember.