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Sökning: WFRF:(Maibach Howard)

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21.
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22.
  • Zhai, Hongbo, et al. (författare)
  • Comparison of tissue viability imaging and colorimetry : skin blanching
  • 2009
  • Ingår i: Skin research and technology. - : Wiley. - 0909-752X .- 1600-0846. ; 15:1, s. 20-23
  • Tidskriftsartikel (refereegranskat)abstract
    • Operator-independent assessment of skin blanching is important in the development and evaluation of topically applied steroids. Spectroscopic instruments based on hand-held probes, however, include elements of operator dependence such as difference in applied pressure and probe misalignment, while laser Doppler-based methods are better suited for demonstration of skin vasodilatation than for vasoconstriction. To demonstrate the potential of the emerging technology of Tissue Viability Imaging (TiVi) in the objective and operator-independent assessment of skin blanching. The WheelsBridge TiVi600 Tissue Viability Imager was used for quantification of human skin blanching with the Minolta chromameter CR 200 as an independent colorimeter reference method. Desoximetasone gel 0.05% was applied topically on the volar side of the forearm under occlusion for 6 h in four healthy adults. In a separate study, the induction of blanching in the occlusion phase was mapped using a transparent occlusion cover. The relative uncertainty in the blanching estimate produced by the Tissue Viability Imager was about 5% and similar to that of the chromameter operated by a single user and taking the a(*) parameter as a measure of blanching. Estimation of skin blanching could also be performed in the presence of a transient paradoxical erythema, using the integrated TiVi software. The successive induction of skin blanching during the occlusion phase could readily be mapped by the Tissue Viability Imager. TiVi seems to be suitable for operator-independent and remote mapping of human skin blanching, eliminating the main disadvantages of methods based on hand-held probes.
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23.
  • Zhai, Hongbo, et al. (författare)
  • Tissue viability imaging : mapping skin erythema
  • 2009
  • Ingår i: Skin research and technology. - : Wiley. - 0909-752X .- 1600-0846. ; 15:1, s. 14-19
  • Tidskriftsartikel (refereegranskat)abstract
    • Tissue Viability Imaging (TiVi) is an emerging bioengineering technology intended for two-dimensional mapping of skin erythema and blanching. Before TiVi can be effectively used in studies of diseased or damaged skin, the variability in normal skin red blood cell concentration (RBCconc) requires evaluation. To demonstrate how TiVi maps spatial and temporal variations in normal skin RBCconc at the dorsal side of the hand at rest and during post-occlusive hyperemia. Short-term and day-to-day variations in skin RBCconc were quantified at the dorsal side of the hand in four healthy volunteers at rest. In a separate study, the increase in skin RBCconc was recorded during post-occlusive hyperemia. A lower skin RBCconc (179-184 TiVi units) was observed at the back of the hand and base of the thumb compared with areas adjacent to the nailfoldfold region of the fingers (190-213 TiVi units). The short-term variation (within 70 s) was < 2% in all areas of the dorsal side of the hand, while day-to-day variations were in the range 5-7% in the back of the hand and up to 10% in areas adjacent to the nailfold region. In the post-occlusive hyperemia phase, up to a 60% increase in skin RBCconc was observed in the early part of the reactive hyperemia phase. This increase in skin RBCconc successively decreased but remained about 18% above the pre-occlusion level after 30 min. Establishment of healthy skin RBCconc reference values is important for the design of versatile test procedures for assessment of skin damage caused by vibration tools, chemical exposure or peripheral vascular disease.
  •  
24.
  • 2019
  • Tidskriftsartikel (refereegranskat)
  •  
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