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A comparison of three times vs. five times weekly narrowband ultraviolet B phototherapy for the treatment of chronic plaque psoriasis

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Background:

Narrowband ultraviolet B (NB-UVB) phototherapy is an effective treatment for psoriasis. Objectives:

To compare the effects of three and five times weekly NB-UVB phototherapy in the treatment of chronic plaque psoriasis. Methods:

Sixty-five patients with chronic plaque psoriasis were allocated to receive three or five times weekly NB-UVB, starting at low dose. Results:

Among the patients who completed the study, clearance was achieved in 18 out of 23 patients (78%) in the three times weekly group and in 15 out of 22 patients (68%) in the five times weekly group. The difference was not statistically significant (P=0.44).

No statistically significant differences were found between the two groups in the number of treatments (P=0.95), cumulative UVB dose (P=0.51), and rate of side-effects. Length of the treatment period was significantly shorter in the five times weekly group (P<0.001). At the end of treatment, the mean psoriasis area and severity index score was lower in the three times weekly group (P=0.02). Conclusions:

We recommend three times weekly NB-UVB for chronic plaque psoriasis; however, the more rapid clearance of psoriasis with five times weekly phototherapy may justify using this method in some patients.
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Keywords: narrowband ultraviolet B; phototherapy; psoriasis

Document Type: Research Article

Affiliations: 1: Department of Dermatology, Razi Hospital, Tehran University of Medical Sciences, Tehran, Iran 2: Department of Radiology, Ahvaz University of Medical Sciences, Ahvaz, Iran 3: Ganjavian Hospital, Ahvaz University of Medical Sciences, Dezfoul, Iran

Publication date: 2010-02-01

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