Application of infrared Thermography in rabbit orthopaedic models

Abstract

The rectal or internal temperature (BT) is a reference method for body temperature. BT and ear temperature (BTear) were recorded in rabbit orthopaedic experimental model - White New Zeeland rabbits (N = 14), for a six day post-surgery period. Ear (BTear) temperature measured with infrared thermography (IRT) camera was compared with rectal body temperature (BT) measured with digital thermometer. Each BTear and BT methods were studied by analysis of variance and for BT classes such as: hypothermia (BTh≥ than 38,5оC), normothermia (BTn) and hyperthermia or fever (BTf ≥ 40,0 оC). Mean differences, linear regression and Pearson correlation were analysed. BTear was positively correlated with rectal temperature (BT); r=+0.579 at p <0.001. The regression equation model was statistically acceptable (p<0.001) and value of internal body temperature can be estimated on ITR measurements by relation: BT (оC) = 25.498 + BTear x 0.361 with R2=0.336. This study demonstrates that IRT technology, a passive and non-contact technology can be effectively used for estimating BT changes in rabbits.