All the patients in this study had hearts that could not pump blood properly.The scientists measured their ejection fraction(射血分数).1t is a measure of heart performance;you measure how much blood is being pumped out by the left ventricle(心室).
Healthy peoples ejection fraction is about 55%.These patients had ejection fraction of under 35%.They a11 had by-pass surgery(搭桥手术)performed on them.Some of the patients had stem cells taken from their hip bones and injected into 25-30 sites in the damaged heart muscle,Six months later their ejection fraction rate was 46.1%while those who just had surgery but no stem cell injections averaged 37 2%.
No side effects were reposed.
Heart failure is a common problem all over the world.In the UK alone about 650,000 people suffer from heart failure every year.As the number of people suffering from heart failure increases in the world in general these findings are particularly significant.
Current treatments relieve the symptoms.This new stem cell therapy actually repairs the damaged muscle in the heart and has the potential of curing the disease.
16 The 20 patients had stem cell injections instead of surgery.
A Right
B Wrong
C Not mentioned
17 The experiment proved to be satisfactory.
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