injuries poisoning
How To Do a Median Nerve Block
Warnings and Common Errors
Do not insert the needle more than 1 cm deep to the palmaris longus tendon, because injecting anesthetic too deeply is a common cause of failure of median nerve block at the wrist. To minimize the risk of needle breakage, do not do any of the following: bend the needle, insert it to its full depth (ie, to the hub), or attempt to change direction of the needle while it is inserted. To help prevent nerve injury or intraneural injection, instruct patients to report paresthesias or pain during the nerve block procedure. To help prevent intravascular injections, aspirate before injecting. If using ultrasound, always maintain ultrasound visualization of the needle tip during insertion. 