Level of tracheostomy is by which of the following anatomical landmark? (Repeat): (A) Cricoid cartilage, (B) Isthumus of thyroid, (C) 2nd tracheal ring, (D) 3rd tracheal ring
Answer is B. 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