| 摘要 |
Methods and systems for determining the proper placement of an epidural catheter prior to administration of anesthetic is described. In a preferred embodiment, an aqueous fluid is introduced into an epidural catheter that has been inserted into the spine of a subject. Motor reactions by the subject in response to electrical current applied through the aqueous solution is monitored. By monitoring the motor response with respect to electrical stimulation, the proper placement of an epidural catheter can be differentiated from the placement of the catheter in subarachnoid, subcutaneous or epidural intravascular placement. Additionally, in the preferred embodiment, a wire is disposed within the catheter tube to facilitate the passage of electric current. However, to avoid electrochemical reaction of the wire with the aqueous solution and/or the subject's dural tissue, the wire does not extend completely to the distal end of the catheter tube.
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