Predicting successful supraclavicular brachial plexus block using pulse oximeter perfusion index

Abstract

The PI is a useful tool for evaluation of successful supraclavicular nerve block. A PI ratio of > 1.4 is a good predictor for block success.

Blood flow index as an indicator of successful sciatic nerve block: a prospective observational study using laser speckle contrast imaging

“…Full-field LDPI can evaluate and analyse perfusion but at low temporal resolutions. Pulse oximeter was reported to evaluate perfusion index after supraclavicular brachial plexus block 8 and sciatic nerve block. 9 However, this technology can only measure perfusion index on one digit and cannot provide the perfusion index at the ROIs.…”

“…3e5 LDPI can provide quantitative data on blood flow, but this technique is limited by poor temporal resolution. 6 Pulse oximeter technology was reported to predict the postspinal hypotension 7 and indicate block success for brachial plexus block 8 and sciatic nerve block. 9 Pulse oximeter measures changes in perfusion index, but one probe can only be placed on one digit within the same time period.…”

Assessment of skin temperature during regional anaesthesia—What the anaesthesiologist should know

“…Several methods have been described, such as measurement of peripheral flow index and perfusion index, both via pulse oximetry. Furthermore, an increase in electrical resistance of the skin has been identified as a reliable indicator of PNB, albeit questioned in later studies .…”

Evaluation of the success of supraclavicular blockade performed under general anesthesia in arthroscopic surgery of the shoulder by using Perfusion Index

“…PI index was reported to change significantly at the fifth minute after a supraclavicular blockade. A. Abdelnasser et al reported that PI may be useful in determining the success of a supraclavicular blockade in patients undergoing orthopedic surgery [36]. Yamazaki et al [37].…”