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Perfusion index as a tool to evaluate the efficacy of stellate ganglion block for complex regional pain syndrome

  • Eung Don Kim
  • Woo Joo Yoo
  • Yun Jae Lee
  • Hue Jung ParkEmail author
Letter to the Editor

Dear Editors,

Vasomotor disturbance symptoms such as abnormal thermal sensation are common in patients with complex regional pain syndrome (CRPS) [1]. Sympathetic blocks can be applied to treat such vasomotor symptoms, and stellate ganglion block (SGB) is commonly used to manage CRPS involving the upper extremities [2]. To date, observations of the temperature increase on the treated side and the Horner’s sign have been used as indicators of successful SGB [3]. However, in clinical practice, patients with chronic CRPS often have ambiguous changes in parameters such as temperature after a sympathetic block.

Perfusion index (PI) is a parameter calculated from photoplethysmography and reflects the perfusion state of the monitoring site. PI is expressed as the ratio (%) of the amplitude of the non-pulsatile signal to the amplitude of the pulsatile signal and its value ranges from 0.02–20% [4]. In previous studies, PI was reported more sensitive than temperature as a parameter to measure...

Keywords

Sympathetic block Stellate ganglion block Complex regional pain syndrome Temperature Perfusion index 

Abbreviations

CRPS

Complex regional pain syndrome

SGB

Stellate ganglion block

PI

Perfusion index

T

Temperature

ΔPI

Side differences in perfusion index increase

ΔT

Side differences in temperature increase

Notes

Funding

There was no funding of this research.

Compliance with ethical standards

Conflict of interest

The authors confirm that there is no conflict of interest.

Supplementary material

10286_2018_585_MOESM1_ESM.tif (202 kb)
Figure 1. Changes in parameters (temperature and PI) and percentage of changes in parameters after SGB over time. A: Changes in temperature after SGB. B: Changes in PI after SGB. C: Percentage of changes in temperature and PI after SGB over time. SGB: Stellate ganglion block. PI: Perfusion index. * p < 0.05 compared with baseline. # p < 0.001 compared with baseline (TIFF 202 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Anesthesiology and Pain Medicine, School of Medicine, The Catholic University of KoreaDaejeon St. Mary’s HospitalDaejeonRepublic of Korea
  2. 2.Department of Anesthesiology and Pain Medicine, School of Medicine, The Catholic University of KoreaSeoul St. Mary’s HospitalSeoulRepublic of Korea

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