Photoelectric quantitative evaluation of argon laser treatment of port wine stains

Photoelectric quantitative evaluation of argon laser treatment of port wine stains
February 1991
To cite this article: R. A. NEUMANN, R. M. KNOBLER, A. P. LINDMAIER (1991)
Photoelectric quantitative evaluation of argon laser treatment of port wine stains
British Journal of Dermatology 124 (2), 181Ò186.
doi:10.1111/j.1365-2133.1991.tb00430.x

R. A. NEUMANN11Department of Dermatology II. University of Vienna, Alserstrasse 4, 1090 Vienna, Austria, R. M. KNOBLER11Department of Dermatology II. University of Vienna, Alserstrasse 4, 1090 Vienna, Austria AND A. P. LINDMAIER11Department of Dermatology II. University of Vienna, Alserstrasse 4, 1090 Vienna, Austria1Department of Dermatology II. University of Vienna, Alserstrasse 4, 1090 Vienna, Austria
Correspondence: Dr R. A. Neumann.
Summary

Sixty patients with port wine stains were treated with the argon laser and graded visually into four subjective categories for changes in skin colour. For objective quantitative evaluation a photoelectric colorimeter was used. Reproducible definition of the lightness of the lesions into numbers was obtained. Differentials in lightness between normal contralateral skin and the portwine stain before and after treatment were quantified for each individual. The objective evaluation revealed a statistically significant difference between the four categories (P<0.05). The best clinical therapeutic effect was found to correlate with only 80Ò90% blanching. The average lightening obtained was 46.5%. Local heating of portwine stains in 12 patients showed no measurable darkening in the colour of the lesions, whereas the normal contralateral skin reacted with marked reddening. Determination of changes in lightness by photoelectric colorimetry provides an objective, quantitative means to evaluate the effects of laser treatment of port wine stains.

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