my grandma in 74 years old and she has heart rhythm problem,her heart beats fast sometimes and it makes her feel so bad,she also has high blood pleasure,her heart rhythm problem had happened after her angiology 9 years ago,she takes pills but they don't seem to work out,dr says that she may need to has an operation in order to burning the beat.she is so scared of it because she has a bad experience of her angiology and the dr also has said that she has 80% chances in this operation.and if she wants to keep taking pills she must change them often and they might causes other problems.what do you think?should she has an operation?is there any pills which she can take?any advice?thanks