Abstract
Purpose
This study investigated the penetration of lidocaine around and through a sutured incision following the application of iontophoretic and passive patches in the CD Hairless rat.
Materials and Methods
Concentrations in localized areas (suture, dermis, subcutaneous, and vascular) were determined using microdialysis sampling followed by analysis using liquid chromatography with UV detection.
Results
Iontophoresis significantly enhanced the dermal penetration of lidocaine. In an intact skin model, dermal concentrations were 40 times greater following iontophoretic delivery compared to passive delivery. In a sutured incision model, iontophoresis enhanced localized concentrations in the dermis, suture, and subcutaneous regions by 6-, 15-, and 20-fold, respectively. Iontophoretic delivery to a region containing a sutured incision was focused to the incision resulting in a greater increase in the suture concentration and in the subcutaneous region directly below the incision.
Conclusions
The four microdialysis probe design was successful in the determination of localized drug penetration in a sutured incision model. Iontophoresis enhanced skin penetration and allowed for site specific delivery when applied to a sutured incision.
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Acknowledgements
The authors would like to thank the Lawrence Memorial Hospital, especially Dr. Mike Thompson, for their help with processing the histology slides. This work was funded by Travanti Pharma, Inc.
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Holovics, H.J., Anderson, C.R., Levine, B.S. et al. Investigation of Drug Delivery by Iontophoresis in a Surgical Wound Utilizing Microdialysis. Pharm Res 25, 1762–1770 (2008). https://doi.org/10.1007/s11095-007-9490-2
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DOI: https://doi.org/10.1007/s11095-007-9490-2