question: I just had a bout of Afib that lasted 24 hrs.  I went to the ED and was put on metoprolol and had a follow up ekg to establish that my heart was back in sinus yesterday morning.  Last night and still this morning I have a very mild pain or tightness in my left chest.  It is mostly noteable if I take a deep breath and reminds me of the kind of muscle pain I might get in other muscles a day after a work out.  Would 24hrs of Afib cause this kind of a delayed ache?  I also walked and rode my bike yesterday following the \"all clear\" on the ekg.  I would not normally even pay attention to this amount discomfort but following the Afib, I guess I wonder if I should back off the excercise regime.