In emergency tracheostomy the followingstructures are damaged except:: (A) Isthmus of the thyroid, (B) Inferior thyroid aery, (C) Thyroid ima, (D) Inferior thyroid vein
Answer is B. Inferior thyroid aery Ref: Keith L Moore 5/e p1100]Isthmus, thyroid ima aery and inferior thyroid veins are midline structures and thus can be injured during tracheostomy, more so during emergency tracheostomy. Inferior thyroid aery, a branch of the thyrocervical trunk of the subclan aery lies laterally away from midline, thus can escape injury.In emergency tracheostomy following structures can be damaged:- Isthmus- Inferior thyroid veins- Thyroid ima aery- Left brachio-cephalic vein, jugular venous arch- Pleura (especially infants)- Thymus- Esophagus (the trachea is small, mobile, and soft in infants damage the esophagus)