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Correlation of changes in hemodynamic response as measured by cerebral optical spectrometry with subjective pain ratings in volunteers and patients: a prospective cohort study

Authors Eisenried A, Austin N, Cobb B, Akhbardeh A, Carvalho B, Yeomans DC, Tzabazis AZ

Received 17 January 2018

Accepted for publication 24 July 2018

Published 24 September 2018 Volume 2018:11 Pages 1991—1998

DOI https://doi.org/10.2147/JPR.S162839

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Andrew Yee

Peer reviewer comments 6

Editor who approved publication: Dr Katherine Hanlon


Andreas Eisenried,1,2 Naola Austin,1 Benjamin Cobb,1 Alireza Akhbardeh,3 Brendan Carvalho,1 David C Yeomans,1 Alexander Z Tzabazis1,4

1Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University School of Medicine, Stanford, CA, USA; 2Department of Anesthesiology, University Hospital Erlangen, Erlangen, Germany; 3ROPAmedics LLC, San Francisco, CA, USA; 4Department of Anesthesiology and Critical Care, University Hospital Schleswig-Holstein, Lübeck, Germany

Purpose: Noninvasive cerebral optical spectrometry is a promising candidate technology for the objective assessment physiological changes during pain perception. This study’s primary objective was to test if there was a significant correlation between the changes in physiological parameters as measured by a cerebral optical spectrometry-based algorithm (real-time objective pain assessment [ROPA]) and subjective pain ratings obtained from volunteers and laboring women. Secondary aims were performance assessment using linear regression and receiver operating curve (ROC) analysis.
Patients and methods: Prospective cohort study performed in Human Pain Laboratory and Labor and Delivery Unit. After institutional review board approval, we evaluated ROPA in volunteers undergoing the cold pressor test and in laboring women before and after epidural or combined spinal epidural placement. Linear regression was performed to measure correlations. ROCs and corresponding areas under the ROCs (AUC), as well as Youden’s indices, as a measure of diagnostic effectiveness, were calculated.
Results: Correlations between numeric rating scale or visual analog scale and ROPA were significant for both volunteers and laboring women. AUCs for both volunteers and laboring women with numeric rating scale and visual analog scale subjective pain ratings as ground truth revealed at least good (AUC: 70%–79%) to excellent (AUC >90%) distinction between clinically meaningful pain severity differentiations (no/mild–moderate–severe).
Conclusion: Cerebral Optical Spectrometry-based ROPA significantly correlated with subjectively reported pain in volunteers and laboring women, and could be a useful monitor for clinical circumstances where direct assessment is not available, or to complement patient-reported pain scores.

Keywords: pain, assessment, objective, subjective, quantification, cerebral optical spectrometry

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