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Photobiomodulation as a treatment tool in a domestic cat with multiple comorbidities – case report

Beatriz Catarine Osses, Antonieta Marques Caldeira Zabeu

Brazilian Journal of Animal and Environmental Research, 2026

Abstract

The use of phototherapy techniques involving Low-Level Laser Therapy (LLLT) has gained increasing ground in small animal veterinary practice. Among the phototherapy techniques applied in veterinary medicine, transdermal systemic vascular irradiation—which involves irradiating the blood circulating within the animal's body—is a treatment of choice for animals with multiple comorbidities; it can act as a complement to conventional therapeutic protocols or be used independently (Pryor & Millis, 2015; Mendes & Arias, 2012). Given this context, the objective of this case report is to demonstrate the effectiveness of transdermal systemic vascular irradiation phototherapy in treating a domestic cat with multiple comorbidities. For phototherapy treatment, a (GaAlAr) laser diode was used with the following parameters: wavelength (λ) of 658 nm, power (P) of 180 mW, spot area (Ø) of 0.0125 cm², energy density (DE) of 6,912 J/cm², and energy (J) of 86.4 J. In this case report, the use of transdermal systemic vascular phototherapy in a feline patient effectively and lastingly modulated chronic degenerative processes and controlled pain caused by spinal spondylosis. Significantly, it improved the patient's quality of life, enabling the animal to explore other areas of its living environment and exhibit species-specific behaviors.

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