射血分数 心脏衰竭 Measurement
What is “ejection fraction”?
Ejection fraction (EF) is a measurement, 以百分比表示, of how much blood the left ventricle pumps out with each contraction. An ejection fraction of 60 percent means that 60 percent of the total amount of blood in the left ventricle is pushed out with each heartbeat. A normal heart’s ejection fraction is between 55 and 70 percent.
This indication of how well your heart is pumping out blood can help to diagnose and track 心脏衰竭.
值得注意的是, 然而, that you can have a normal ejection fraction measurement and still have 心脏衰竭. This is called HFpEF or 心脏衰竭 with preserved ejection fraction. It happens when your heart’s muscle has become so thick and stiff that the ventricle holds a smaller than usual volume of blood. 在这种情况下, your heart might still have an ejection fraction that falls in the normal range because your heart is pumping out a normal percentage of the blood that enters it. However in HFpEF, the total amount of blood pumped isn’t enough to meet your body’s needs.
多么不健康的EF?
An EF from 41 to 49 percent might be considered too low. It does not always indicate that a person is developing 心脏衰竭, but it could indicate damage, perhaps from a previous heart attack. An ejection fraction measurement under 40 percent might be evidence of 心脏衰竭 or 心肌病. In severe cases, EF can be even lower than 40.
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An ejection fraction measurement higher than 75 percent could indicate a heart condition such as hypertrophic 心肌病.
Download HF And Your 射血分数 Explained 英语(PDF) | 西班牙语(PDF)
Using ejection fraction in diagnosis
Your health care professional might mention one of these two EF-related scenarios:
- Preserved ejection fraction (HFpEF) – also referred to as diastolic 心脏衰竭. The heart muscle contracts normally, but the ventricles do not relax as they should during ventricular filling (or when the ventricles relax).
- Reduced ejection fraction (HFrEF) – also referred to as systolic 心脏衰竭. The heart muscle does not contract effectively, and therefore less oxygen-rich blood is pumped out to the body.
测量EF的试验
Your health care professional might recommend one or more of these tests to measure your ejection fraction:
了解更多关于 common tests for diagnosing 心脏衰竭.
