hlo teri…i m medical student and in my final years.listen, you hav a history of asthma 4 of a long period.if asthma is not controlled or there r risk factors like if u keep smoking, then it converts to COPD(chronic obstrutive pulmonary disease).obviously aftr a long time of this respiratory problem, the heart enlargement is but normal as your heart has 2 work a lot and u may have another disease called congestive heart insuffciency..if you feel tht you hav easy fatigue or oedema of ur extremities then dnt hesitate to consult a good cardiologist so tht he could make a plan for ur treatment..
plz take care of ur diet too and avoid risk factors if u hav ror u can.
regards QASIM
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