injuries poisoning
How To Do a Median Nerve Block
Complications
 Local anesthesia for laceration treatment (eg, allergic reaction to the anesthetic [rare] or to methylparaben [a preservative]) Toxicity due to anesthetic overdose (eg, seizure, cardiac arrhythmias) or sympathomimetic effects due toepinephrine(if using an anesthetic-epinephrinemixture) Intravascular injection of anesthetic orepinephrine Hematoma Neuritis Spread of infection, by passing the needle through an infected area Most complications result from inaccurate needle placement. 