EP009 Usefulness of perfusion index in predicting successful brachial plexus block: an observational study

<h3></h3> <b>Please confirm that an ethics committee approval has been applied for or granted</b>: Yes: I’m uploading the Ethics Committee Approval as a PDF file with this abstract submission <h3>Background and Aims</h3> Ultrasound-guided supraclavicular brachial blocks are increasingly utilized for their efficacy and safety in upper limb surgeries. However, traditional methods for assessing block success lack precision. This study investigates the potential of the perfusion index (PI), a non-invasive measure of peripheral perfusion, to predict block success and establishes a cut-off value for its application. <h3>Methods</h3> Seventy-seven ASA 1 and 2 patients aged 18-60 undergoing upper limb surgeries participated. Baseline PI values were recorded bilaterally pre-block. PI measurements were taken every five minutes for 30 minutes post-block, alongside sensory and motor block assessments. The PI ratio, comparing PI post-10 minutes to baseline, was computed. Predictive accuracy was evaluated using a receiver operating characteristic curve. <h3>Results</h3> The operated limb consistently exhibited higher PIs throughout the study period. A PI ratio of 2.2 demonstrated 100% sensitivity and specificity in predicting block success. <h3>Conclusions</h3> The study establishes the reliability of PI as a predictor for successful supraclavicular brachial blocks, offering a superior alternative to conventional methods. Incorporating PI measurement into these blocks holds promise for improving procedural outcomes. Further research is warranted to validate these findings and explore broader clinical applications