Characterization of Rebound Pain Following Peripheral Nerve Block and Its Association With Gut Microbiome Diversity

The objective of this study is to determine the association between gut microbiome diversity and the characteristics of rebound pain at offset of peripheral nerve block in patients who have undergone upper limb surgery. Other purposes of this study are to determine associations between gut microbiome constitution and persistent post-surgical pain; and describing rebound pain by quantifying its clinical, psychological and neurophysiological characteristics in this patient cohort.