hi i am from india,my dad underwent TMT few days back and it showed some sort of blockage in heart , the doctors prescribed him some medicines and now they are asking him to undergo angiography which i have heard is very painful. i have also heard about echo test,i just want to know that is it possible to know exact percentage of blockage in arteries through echo test , or angiography is compulsory.what medicines would you suggest at this stage when the percentage of blockage is not known? thanks a lot,plz reply soon