On Wed, 22 Jul 1998 [log in to unmask] wrote:
> We were taught that Dexamethasone is positively charged and should be used
> with the anode. Reference: Nelson & Currier, Clinical Physical Therapy,
> 1991, Appleton & Lange. (Many times it is used with Lidocaine which is
> negative and therefore would require a switch to the cathode to complete
> treatment.)
> Hope this helps!
> Annette Nickel, SPT
> University of Michigan - Flint
> [log in to unmask]
>
Annette:
Better check another reference; Lidocaine is positive, dexamethasone is
negative. Check the Petelenz paper I cited in an earlier message, as well
as Robinson AJ & Snyder-Mackler L: Clinical Electrophysiology:
Electrotherapy and Electrophysiologic Testing (2nd edition). The chapter
on iontophoresis by Chuck Ciccone lists dexamethasone as an anion,
lidocaine as a cation.
The idea of mixing the two drugs together for iontophoresis is pointless;
if injected, it is a good idea, but not rational for iontophoresis.
Frank
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Frank B. Underwood, PT, PhD, ECS voice 812-488-1053
Associate Professor facsimile 812-479-2717
University of Evansville email [log in to unmask]
Department of Physical Therapy
1800 Lincoln Avenue
Evansville, IN 47722-0002
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