RESUMO
Phototherapy with photochemotherapy (PUVA) is a well‑known and well‑studied modality for the treatment of psoriasis, which involves systemic or topical administration of chemicals known as psoralens and administration of ultraviolet light in increasing dosages after requisite time gap. PUVA is also used in the treatment of widespread vitiligo with moderately good results, though it is being surpassed by ultraviolet B (UVB), which is equally or slightly more efficacious with fewer side effects. PUVA induces repigmentation by varying mechanisms such as stimulation of melanogenesis, immunomodulation and activation of growth factors, though the exact mechanism is still speculative. There are various studies evaluating the efficacy of PUVA in psoriasis as well as in vitiligo, either alone or in combination with other immunosuppressants like azathioprine and calcipotriene.
Assuntos
Furocumarinas/administração & dosagem , Furocumarinas/uso terapêutico , Humanos , Fotoquimioterapia/métodos , Psoríase/tratamento farmacológico , Psoríase/radioterapia , Psoríase/terapia , Raios Ultravioleta/administração & dosagem , Raios Ultravioleta/uso terapêutico , Vitiligo/tratamento farmacológico , Vitiligo/radioterapia , Vitiligo/terapiaRESUMO
The definition PUVA therapy formed by the originals of psoralen [P] and ultraviolet "light therapy" A [UVA] indicate a photochemotherapeutic technique in big improvment. The main indications of PUVA therapy are the generalised and complicated psoriasis, plaque parapsoriasis and mycosis fungoides. Considering the early side effects, usually mild [digestiv intolerance, allergy, phototoxicity], eye lesions and increased incidence of skin cancer we have to be very careful in order to prescribe this technique