Transmitância óptica de coberturas primárias usadas no tratamento de feridas cutâneas

Abstract

There is a wide variety of dressings and methods used for the treatment of cutaneous wounds and the choice thereof varies according to the type of wound, size, location and even patient cost benefit, with the choice of primary dressing being primarily based on the expected action on the lesion bed. One method that has been shown to be effective in repairing lesions is photobiomodulation (PBM). Currently, the application of laser or LED to a wound requires the removal not only of the secondary but also of the primary dressing, since there are no studies on the transmission of photons through said dressing. Thus, the objective of our research was to determine the transmittance spectrum of primary dressings commonly used in the treatment of cutaneous wounds, to verify if there is a real need to remove them during photobiomodulation. The spectroscopic analysis of the 17 dressings studied was performed using a spectrophotometer (USB 2000+, light source HD-2000-BAL®, OceanOptics®, USA), where each fragment of the dressings was inserted into a quartz cuvette, with the back reflection from the walls of the slides corrected for using a 0.9% saline solution to completely fill the cuvette (baseline). The transmittance of each dressing was measured between 350 nm and 950 nm, and a transmittance table was created, based on the main wavelengths used in photobiomodulation. Seven dressings are indicated to remain in the lesion during irradiation by having optical transmittance above 30%: Supriderme®, Membracel®, Intrasite®, Cuticell® Contact, UrgoTul®, TegadermTM and Opsite Flexigrid®. It is expected that this knowledge will provide greater effectiveness of both treatments - photobiomodulation and primary coverages - reducing the discomfort of the patient and the cost in performing the dressings, by reducing unnecessary changes.