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Article

Theoretical Study on Pressure Damage Based on Clinical Purpura during the Laser Irradiation of Port Wine Stains with Real Complex Vessels

by 1,2, 1,* and 1
1
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2
State-Province Joint Engineering Lab of Fluid Transmission System Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(24), 5478; https://doi.org/10.3390/app9245478
Received: 18 November 2019 / Revised: 7 December 2019 / Accepted: 9 December 2019 / Published: 13 December 2019
(This article belongs to the Special Issue Biomedical Optics and Engineering)
Port wine stains (PWSs) are congenital dermal vascular lesions composed of a hyperdilated vasculature. Purpura represented by local hemorrhage from water vaporization in blood during laser therapy of PWS is typically considered a clinical feedback, but with a low cure rate. In this study, light propagation and heat deposition in skin and PWSs is simulated by a tetrahedron-based Monte Carlo method fitted to curved bio-tissues. A curvature-corrected pressure damage model was established to accurately evaluate the relationship between purpura-bleeding area (rate) and laser therapy strategy for real complex vessels. Results showed that the standard deviation of Gaussian curvature of the vessel wall has negative relation with the fluence threshold of vessel rupture, but has positive relation with the effective laser fluence of vessel damage. This finding indicated the probable reason for the poor treatment of PWS, that is, considering purpura formation as a treatment end point (TEP) only leads to partial removal of vascular lesions. Instead, appropriate purpura area ratio with marked effects or rehabilitation should be adopted as TEP. The quantitative correlation between the fluence of a pulsed dye laser and the characteristics of vascular lesions can provide personalized and precise guidance for clinical treatments. View Full-Text
Keywords: port wine stains; laser therapy; curvature-corrected pressure damage model; purpura; treatment end point port wine stains; laser therapy; curvature-corrected pressure damage model; purpura; treatment end point
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MDPI and ACS Style

Jia, H.; Chen, B.; Li, D. Theoretical Study on Pressure Damage Based on Clinical Purpura during the Laser Irradiation of Port Wine Stains with Real Complex Vessels. Appl. Sci. 2019, 9, 5478. https://doi.org/10.3390/app9245478

AMA Style

Jia H, Chen B, Li D. Theoretical Study on Pressure Damage Based on Clinical Purpura during the Laser Irradiation of Port Wine Stains with Real Complex Vessels. Applied Sciences. 2019; 9(24):5478. https://doi.org/10.3390/app9245478

Chicago/Turabian Style

Jia, Hao, Bin Chen, and Dong Li. 2019. "Theoretical Study on Pressure Damage Based on Clinical Purpura during the Laser Irradiation of Port Wine Stains with Real Complex Vessels" Applied Sciences 9, no. 24: 5478. https://doi.org/10.3390/app9245478

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