The frequency-doubled Nd-YAG laser with automatic scanning in the treatment of port-wine stains: A preliminary report
Tóm tắt
The authors report their experience with two recent improvements in the treatment of port-wine stains. Firstly, the frequency-doubled Nd-YAG laser producing a 532 nm wavelength. This wavelength corresponds to greater absorption by haemoglobin (15–20% more than with the argon laser beam) and so is more selectively absorbed by angiomatous tissue. This gives better clinical results and the classic side effects of the argon laser are eliminated (with the frequency-doubled Nd-YAG, there is no damage to hair or to healthy non-angiomatous skin). Treatment is thus made easier, as shownn in our series of 79 patients who received 92 treatment sessions over a period of 14 months. In addition, an automatic device makes it possible to use the beam on a continuous mode scanning contiguous sections (Multiscan). With this automatic apparatus, treatment becomes uniform because the variations inherent to the use of a hand piece are eliminated. Extensive port-wine stains can also be treated in a single session instead of the multiple sessions which were previously necessary. An interval of 5–6 months should elapse before treating the residual part of the portwine stain, situated deeper in the dermis, which should be considered as a new port-wine stain. The association of the 532 nm wavelength and the automatic, scanning device makes it possible to use fluences of only 8–15 J cm−2. This is explained by the dynamic nature of this treatment and distinguishes it from static treatments requiring higher fluences. Treatment of port-wine stains is thus improved for the ultimate benefit of the patients suffering from this disfigurement.
Tài liệu tham khảo
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