Hi Sir My Father Get Sudden Unconscious In Railway Station

Hi sir my father get sudden unconscious in railway station then I took him hospital .then report conformed and diagnosis information show sinus rhythm slight ST elevation (v4) then doctor suggested to take him big hospital . we took him to big hospital which as all equipments all spec list's in same hospital they put my dad in caulity for same night . then they given injunctions. Next day doctor suggested to nuro physics ion we approached nuro physcsion and he said take CT , RBS, CBP, and s creatinine, and one more thing bp was 180 in causality and after one day it was 140 and now it's around 135 now treatment is going on...
My question is for sinus why should we take ct scane for brane .