i had #2 open heart surgery for re-do 1 cabg, 1st.mvr.a 27-mm st.jude mech.,modified maze procedure,and plication of left atrial appendage on 9/24/2009 dr.s.hom,md.at garfield madical center,monterey park.cal.usa. my question is, i am experiencing tightness at sternotomy colder weather(below...