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310 Whelan et al. FIG. 9. Change in basic fibroblast growth factor (FGF-2) concentration (mg/mg protein) versus time (days). will incorporate the combination of three wavelengths (670, 728, and 880 nm) in the treatment groups. The wounds were traced manually on days 4, 7, 10, and 14. These tracings were subsequently scanned into a computer, and the size of the wounds was tracked using SigmaScan Pro software. Figure 7 depicts the change in wound size over the course of the 14-day experiment. The combination of HBO and LED (880 nm) proved to have the greatest effect in wound healing in terms of this qualitative assessment of wound area. At day 7, wounds of the HBO and LED (880 nm) group were 36% smaller than those of the control group. That size dis- crepancy remained by day 10. The LED (880 nm) alone also speeds wound closure. On day 7, the LED (880 nm) treated wounds was 20% smaller than the control wounds. By day 10, the difference between these two groups dropped to 12%. This was due to the fact that there is a point when the wounds from all of the groups will be closed. Hence, the early differences are the most important in terms of determining the optimal ef- fects of a given treatment. This can be seen at day 14 (Fig. 7), when the points are converging due to the fact that the wounds are healing. Analysis of the biochemical makeup of the wounds at days 0, 4, 7, and 14 was performed. The day 0 time point was deter- mined by evaluating the punch biopsy samples from the origi- nal surgery. The levels of basic fibroblast growth factor (FGF- 2) and vascular endothelial growth factor (VEGF) were FIG. 10. Type 2 diabetic mice with excisional skin wounds treated with combined LED wavelengths, 4 J/cm2, 50 mW/cm2. The square root of wound area is used in the dependent variable in the analysis. This transformation was needed to correct for noncon- stant error in the general linear model. SqrtArea could be interpreted as being proportional to the radius of a circular wound.PDF Image | Effect of NASA Light-Emitting Diode Irradiation on Wound Healing
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