Single midline injection for bilateral superior laryngeal nerve block

The anatomic dye study by Canty et al. however, specifically noted the need to inject bilaterally because they failed to see dye cross the midline on their specimens [2]. Unlike their specimens, which revealed no dye crossing the midline in any specimen, we saw complete spread across the midline throughout the entire THM (Fig. 1). [...]an intratracheal injection of 4% lidocaine through the cricothyroid membrane is performed to provide endotracheal tube tolerance from recurrent laryngeal nerve (RLN) blockade.