Evolution of treatment of chronic venous ulcers with phototherapy (LEDs) and silver sulfadiazine to 1% / Avaliação do tratamento de úlceras venosas crônicas com fototerapia (LEDs) e sulfadiazina de prata a 1%

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Venous ulcer is the most common type of ulcer in the lower limbs, consequent to chronic venous insufficiency. There are several forms to treat them from topical therapies such as 1% silver sulfadiazine cream to biostimulators devices as ultrasound, phototherapy and others. The phototherapy laser or LEDs (light-emitting diode) has been studied, mainly as biostimulator method for tissue repair and pain relief. This study aims to analyze the effectiveness of treatment with phototherapy (LEDs) associated with the daily dressing of 1% silver sulfadiazine cream (SDZ) in patients with chronic venous ulcers. This study was randomized, double-blind, in which device was used for phototherapy (Dynatron 880 Infrared Therapy Probe - Dynatron Solaris) containing 2 probes of similar conformation and their specifications were revealed only at the end of the study: probe 1 (1 LED - 644 nm, 18 mW, 1.12 J/CM POT.2) and probe 2 (1 LED - 641 nm and 32 LEDs - 891 nm; 131 mW; 1.57 J/CM POT.2). Twenty patients were selected from ulcer outpatient clinic of dermatology service CSE-FMRP-USP, with 32 chronic venous ulcers, which were created 3 groups (G) by different forms of treatment: G1-probe 1 and SDZ; G2-probe 2 and SDZ and G3-only SDZ, followed by 90 days. After ulcers asepsis, the probes were applied on the wound punctually protected with PVC plastic sheet, to 1.5 J/CM POT.2for 30 seg/5 CM POT.2, twice a week, and dressing with SDZ later. Fifthly, the ulcers were photographed digitally and their images were evaluated by the software ImageJ to measure of the total, granulation tissue (red) and sphacel/fibrin (yellow) areas. The wound healing rates (WHR) were calculated by formula [(WHR = Ao-Af)/Ai], meaning Ao (original area) and Af (final area). The averages of the G2 WHRs were 0.3 and 0.5 in the 30th and 90th days, with a significant reduction of the ulcerated areas (p <0.01) when compared to the G3 with averages -0.08 and -0.03 respectively. In the G1, only at the 90th day, the mean of WHR (0.42) was different from the G3 (-0.03), and p<0.01. Considering the frequency of small ulcers with WHR >OU =0.4, the G2 has reached this index by 75% of the ulcers in 30th and 90th days, while the G1 achieved in 33% of ulcers only in the 60th day. In the spectrophotometric analysis in the end of the study, it was observed that the 641 nm LEDs didnt issued effective light in probe 2, which was mainly constituted of 891 nm LEDs. The results showed that the 891 nm LED phototherapy accelerated the healing process of chronic venous ulcers in relation to the 644 nm LED, and both in relation to the silver sulfadiazine cream to 1%, corroborating evidence from several studies in vivo and in vitro on using of phototherapy (lasers and LEDs) of 600 to 1000 nm in tissue repair. Thus, the phototherapy by LEDs showed itself as a good physical method, biostimulator, noninvasive and an adjunct to conventional treatments for venous ulcers, such as silver sulfadiazine to 1%.

ASSUNTO(S)

varicose ulcer interpretation of image commissioned for computer phototherapy cicatrização de feridas lasers interpretação de imagem assistida por computador fototerapia wound healing lasers Úlcera varicosa

ACESSO AO ARTIGO

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