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Hi, Such type of pain which you are telling is generally a neurological pain & is called a post-sternotomy pain syn Chat Doctor.  During the opening of the chest for CABG, some nerves get cut which causes such type of sharp shooting pain. The treatment is basically painkillers, anti-inflammatory agents and vitamin B12. Heat fomentation has also been found to be of some help. Hope I have answered your query. Let me know if I can assist you further. Take care