"Proper epidural technique includes beginning with a "test dose" of a more benign medication (e.g., lidocaine with epinephrine) that can elicit symptoms of inadvertent venous administration (tachycardia, tinnitus) before administration of the more cardiotoxic local anesthetics to mitigate against this occurrence." - wikipedia. Information related to the test dose of the anesthesia agent. [FileMan 130,.37->130.06,32->130.48]