If the heart was enlarged and decreased in its ability to pump adequately at the time of intervention, the LVEF may not change significantly. One can do quite well with an EF in the range you have at the present time by decreasing any stress to the heart such as overweight, smoking, alcohol consumption (excessively), poor diet, no exercise, etc. The body will compensate for a lower than normal EF.
If the heart was functioning with no heart wall damage, the EF may be increased with exercise and medication. The prior lower than normal EF may be the result of heart cells functioning with lower tnan normal oxygen and good blood flow to the heart cells with a bypass can revitalize the myocyte cells.
Thanks for your question, and if you have any further questions or comments you are welcome to respond. Take care,
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