<prompt> Level of tracheostomy is by which of the following anatomical landmark? RepeatCricoid cartilageIsthumus of thyroid2nd tracheal ring3rd tracheal ring  <response>: Ans: B Isthmus of the thyroid Ref: Diseases of the Ear Nose and Throat by PL Dhingra 5th edn .2010.Page 337Explanation:Types of tracheostomy based on positionHigh tracheostomy - Above the thyroid isthmus through the first tracheal ringIncreased risk of sub glottic edema and stenosisMid tracheostomy - At the level of thyroid isthmus, through the 2nd or 3rd tracheal ringIsthmus is divided or retractedMost commonly doneLow tracheostomy - Below the isthmusIncreased risk of injury to great vessels in the neck 