Postoperative wound assessment in cattle: How reliable is the back hand palpation?

摘要

Background: As part of clinical wound assessment in bovine surgery, discrepancies in skin temperature are evaluated by placing the back of the hand on the area to be examined. Generally, an increased skin temperature at the wound site for a prolongedperiod is considered as an indicator of impaired wound healing.The aim of this study was to verify the reliability of palpation under bovine practice conditions using laparotomy as an example. Fourteen cows (German Holstein) with a left displacement of the abomasum (LDA) without other severe concurrent diseases wereexamined preoperatively and once daily for ten days after surgery. The skin temperature of the wound site in the right flank was assessed by palpation, followed by thermographic evaluation using an infrared camera after a 45-min acclimatisation period,under standardised conditions in a closed examination room daily for 10 days.Results: All the incisions healed without clinical detectable perturbances. The ambient temperature range during the study period was 7.8 - 24.1 °C. Two groups were retrospectively defined according to the ambient temperature: high ambient temperature (HT group; median: 20.2 °C 25/75 quartile: 18.5 °C / 21.7 °C; n = 6) and low ambient temperature (LT group; 10.8 °C; 9.4 °C 112.8 °C; n = 8). The temperature differences (AS) between the mean skin temperature of the wound site and a defined reference area cranial to the wound were assessed. A significant negative correlation was found between the ambient temperature (0Amb) and A# (r=-0.51; P 1 °C) at the wound site (sensitivity 0.20; specificity 0.96).Conclusions: The infrared thermography provides a more reliable assessment of temperature changes at the wound site in comparison to manual palpation. The ambient temperature markedly affects the extent of local hyperthermia at the wound site.