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Change in ultraviolet (UV) transmission following the application of vaseline to non-irradiated and UVB-exposed split skin

2000; Oxford University Press; Volume: 143; Issue: 3 Linguagem: Inglês

10.1111/j.1365-2133.2000.03706.x

1365-2133

Klaus Hoffmann, K. Kaspar, Thilo Gambichler, Peter Altmeyer,

Photoacoustic and Ultrasonic Imaging

Background Topical preparations such as emollients used in combination with phototherapy can interfere with such treatment. Objectives This study was performed to investigate the impact of vaseline on the ultraviolet (UV) transmission of non-irradiated split skin and on split skin previously exposed to UVB radiation. Methods Split-skin specimens were obtained from 20 patients. In each case, one sample was taken from an area of non-irradiated skin, while the second was taken from an area that had been previously exposed to UVB. The transmission was spectrophotometrically measured with split skin placed in specially designed quartz glass cuvettes before and after the application of two different amounts of vaseline (2·5 and 17·5 mg cm−2). Results Application of vaseline to skin previously exposed to UVB caused significant (P < 0·0001) changes in UV transmission in certain wavelength ranges. In the UVA range, a greater increase in transmission was achieved with 2·5 mg cm−2 vaseline, whereas in the UVB range, a greater increase was achieved with 17·5 mg cm−2 vaseline. The thicker the layer of vaseline applied, the lower was the difference in transmission between non-irradiated split skin and UVB-exposed split skin. Conclusions Application of the correct amount of vaseline can enhance transmission in either the UVA or UVB range, and would enable dose reduction during a course of phototherapy.