A study of histopathological changes seen in chronic plaque psoriasis, before and after treatment with narrow band Ultraviolet B

  • Amoolya Bhat Department of Pathology, Sapthagiri Institute of Medical Sciences and Research Centre , Bangalore – 90.
  • Subramanya H Department of Pathology, Vydehi Institute of Medical Sciences and Research Centre , Bangalore .
  • Murthy PS Department of Dermatology, Vydehi Institute of Medical Sciences and Research Centre , Bangalore .
  • Santosh KV Department of Pathology, Vydehi Institute of Medical Sciences and Research Centre , Bangalore.
Keywords: Histopathology, narrow band ultraviolet B, PASI score, psoriasis

Abstract

Backgorund: Psoriasis is amultipfactorial chronic inflammatory skin disease characterized by infiltration of T cells and hyperproliferation of keratinocytes in focal skin areas. Narrow band ultraviolet B utilizes the narrow band ultraviolet B(UVB) light frequencies peaking around 311-313nm. Very few histopathological tudies have been done, especially on Asian skins which are predominently that of Fitzpatric type III-V to assess the effectiveness of narrow band ultraviolet B for psoriasis.Method: Severity of psoriasis was graded clinically using psoriasis ara severity index(PASI) score and the success rate and effective rate of UVB therapy were calculated. two skin punch biopsies were taken from each patient. Each patient was given a histopathological score. The difference between pre and post treament histopathological score was calculated. The changes in histopathological parameters among the responders were compared with that of nonresponders.Result: Success rate of UVB therapy in our study was 91.52%. The mean(+/-SD) PASI score before and after treatment were 9.25+/-0.44 and 1.81+/-1.93 respectively.These differences in the scores were statistically significant(p<0.001).Conclusions: A significant difference was observed between the responders and nonresponders in mean change in PASI score and histopathological scores. Percentage of parkeratosis, thickness of granular layer and mitotic figures per mm of surface can be used as markers of progressions to remission following therapy. 

Author Biographies

Amoolya Bhat, Department of Pathology, Sapthagiri Institute of Medical Sciences and Research Centre , Bangalore – 90.
Department of Pathology, Sapthagiri Institute of Medical Sciences and Research Centre , Bangalore – 90.
Subramanya H, Department of Pathology, Vydehi Institute of Medical Sciences and Research Centre , Bangalore .
Department of Pathology, Vydehi Institute of Medical Sciences and Research Centre , Bangalore.
Murthy PS, Department of Dermatology, Vydehi Institute of Medical Sciences and Research Centre , Bangalore .
Department of Dermatology, Vydehi Institute of Medical Sciences and Research Centre , Bangalore.
Santosh KV, Department of Pathology, Vydehi Institute of Medical Sciences and Research Centre , Bangalore.
Department of Pathology, Vydehi Institute of Medical Sciences and Research Centre , Bangalore.

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Published
2016-12-12
Section
Original Article