Thermography as an Early Predictive Measurement for Evaluating Epidural Femoral-Sciatic Block Success in Dogs
Abstract: To evaluate skin temperature increase as an early predictive measure for evaluating epidural and femoral-sciatic block success in dogs.
Study design: Prospective clinical trial.
Animals: A total of 29 dogs undergoing orthopaedic surgery on one hindlimb
Methods: Dogs were anaesthetized and placed into lateral recumbency with the affected limb uppermost and the coat was clipped. Baseline infrared thermographic images (T0) of the affected limb, of the paw pad of the affected leg and of the ipsilateral paw pad were taken. Subsequently, dogs were administered either an epidural (EPI; n=11) or a femoral-sciatic block (FS; n=18) using bupivacaine 1 mg kg-1 . Then, 2 minutes after placement of the block, thermographic images were obtained every 3 minutes for a total of four measurements (T1-T4) and surgery was commenced.
Rescue analgesia consisting of fentanyl 1 μg kg-1 was administered if needed. A regional block was considered successful if the dose of fentanyl administered was less than the lower 95% confidence interval of the geometric mean of the total fentanyl used in each group. A ≥ 1 °C increase of skin temperature was considered as the minimum increase required for detection of a successful block.
Reference: Nina Küls, Karen J Blissitt, Darren J Shaw, Gudrun Schöffmann, Richard E Clutton (2017) Vet Anaesth Analg Sep;44(5):1198-1207
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