Ejection fraction, I think, is given by the ratio of the volume of blood pumped out of the heart (one beat) to the entire volume of the heart. I dont know what the normal ratio is exactly. There are a couple of things to know:
1. if the ejection fraction is low, and you have VT, it may warrant having an ICD.
2. ejection fraction measurements are not very accurate.
3. ejection fraction varies with age, and with exercise.
I've seen ranges as wide as 50-70% being "normal" but generally 55% and up is what the literature says. Below 35% is considered significantly inhibited function and is one of the benchmarks for ICD indication. Your ejection fraction varies somewhat from day to day and hour to hour and measurements have something like a 6%+- margin of error. If your measurement comes in above 50% you're probably in the normal category. All numbers I've referred to above are for left ventricular function. RV ejection fraction can be documented by MRI and angiogram (?) but I don't know normal RV ranges.
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