my mom had surgery about 3 weeks ago which wound up being 8 stents. she went into surgery believing possibly 1 stent.. after about 8 days she developed a cough and shortness of breathe. her lungs are clear . she was put on 2 water pills a day and the cough/shortness of breathe is much better. assuming she was retaining water by the heart causing shortness of breathe??? any idea on what could be causing this and what should be done at this point.