Hi I read your query and understand your concern I am sorry for the symptoms your father is suffering As cardiologist is sure that your father heart is fine you don t have reason to worry too much If pain persist and is most caused by physical stress contact your cardiologist again (You can schedule cardiac laboratory test such as CKMB or troponine to exclude cardiac problems) Sometimes patient have chest pain from injury of muscles during surgery I would go away after days Pain killers can be used to avoid pain Regards