Abstract
Local anesthetics work by inhibiting conduction along peripheral nerves. The most commonly used one is lidocaine. Anesthetics can be mixed with epinephrine when appropriate to produce a local vasoconstriction that decreases its systemic absorption and bleeding. Nerve blocks are classified into ring blocks and peripheral nerve blocks. Both these blocks require the ability to locate anatomical landmarks and to infiltrate with the proper technique to ensure blockade of pain sensation.