<s>[INST] My husband aged 74 had triple heart by pass surgery 11 weeks ago.  Everything went well and he is recovering remarkably well with just a bit of dizziness when standing up quickly.  This has been alleviated by adjustment of his medication. He is pretty fit and active again, but today after dinner he became very breathless which was quite distressing for him and he said his chest felt 'empty'. This is the only time it has occurred.  Is this a normal post-op sympton or could it be a sign of something more serious? [/INST] The dizziness you told is due to a condition called ortho static hypotension,  it is due to some anti hypertensive or rarely anti anginal medication and dose titrated and some changes like to change position slowly should help.  Now post bypass decade of drains there might be some pleuriti pain which may occur due to deep inspiration,  many a times we take after a good meal.  However importantly if the same symptoms occurs again and increases when he does some work.  Plz consult your cardiologist,  Regards </s>