Contact dermatitis from modified rosin in footwear.
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Biomedical subjects
Publications and source records attributed to M H Beck.
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Whilst patch testing with corticosteroids in ethanol is more sensitive than either petrolatum or the cream formulation, the frequency of false-negative reactions is not known. We have compared patch testing with corticosteroid at 1% in ethanol with intradermal (i.d.) tests using 1 mg corticosteroid suspended in normal saline. Patch tests with tixocortol pivalate and budesonide detected all patients allergic to hydrocortisone and budesonide, respectively. For other corticosteroids, the use of ethanol as a vehicle resulted in both false-positive and false-negative reactions. In particular, patch tests with hydrocortisone-17-butyrate missed 30% of all positive reactions detected by i.d. testing. There may be a case for advising the avoidance of this steroid in all patients who are positive on patch testing to tixocortol pivalate and budesonide.
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The correct concentration and vehicle for patch testing with corticosteroids is in many instances not known. The results of this study suggest that 1% in ethanol should be the initial choice, unless it can be shown that petrolatum as a vehicle is as sensitive (tixocortol pivalate and budesonide). We could find no evidence for the anti-inflammatory effects of corticosteroids inhibiting the patch test at higher concentrations. Using ethanol as the vehicle resulted in reactions developing at earlier time points than with petrolatum.
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