My grandmother is 69 years old and just had emergency surgury to have her appendix removed while in Texas on a 3 month fishing trip with my grandfather. After the surgury, they were having difficulties bringing her oxygen level back up which later showed to be due to mild emphysema, but they also did an echocardiogram. The results of the echocardiogram showed that she had a weak heart muscle and she was also told that her heart is only working at 40%. What does this most likely mean and how serious is it? It's difficult for me to gather much information from them when they are so far away and now not sure when they will be back.