Undesired effects of low-level photobiomodulation analgesic therapy in three cats with osteoarthritis

Three cats with osteoarthritis undergoing low-level laser therapy showed undesired effects, namely, discomfort and behavioural changes, after their first laser session. Although visible burns could not be detected and rectal temperature was only slightly elevated compared to pre-procedural values, it is hypothesised that the behavioural changes showed by all three cats, namely, restlessness, tail wiggling, flinching away from touch and frequent position changes, were caused by skin overheating, as it has been reported in human patients.It is advisable to intensify post-procedural monitoring in cats undergoing photobiomodulation as part of the analgesic treatment of osteoarthritis for early detection of complications. Measurement of skin surface temperature of the treated areas and behavioural observation may be recommended in cats following photobiomodulation, possibly until 3-4 h after the end of the laser treatment.