Anaesthesia Fundamental concepts 21d0ddc8 A mid tracheostomy is done over A 1st and 2nd tracheal ring B 2nd and 3rd tracheal ring C 3rd and 4th tracheal ring D 5th and 6th tracheal ring High-Yield Explanation a mid tracheostomy is done at 2nd and 3rd tracheal rings behind the isthumus,it is the operation of choice .