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Pain Research and Management
Volume 20, Issue 6, Pages 305-308
http://dx.doi.org/10.1155/2015/324514
Original Article

The Prolongation of Pulse Transit Time After a Stellate Ganglion Block: An Objective Indicator of a Successful Block

Young Uk Kim,1 Yuseon Cheong,2 Yu Gyeong Kong,3 Jonghyuk Lee,3 Sehun Kim,3 Hong Gyu Choi,1 and Jeong Hun Suh3

1Department of Anesthesiology and Pain Medicine, Catholic Kwandong University of Korea College of Medicine, International St Mary’s Hospital, Incheon, Republic of Korea
2Department of Anesthesiology and Pain Medicine, Kangwon National University Hospital, Chuncheon, Republic of Korea
3Department of Anesthesiology and Pain Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea

Copyright © 2015 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The relationship between the change of pulse transit time and the presence of clinical signs after stallate ganglion block (SGB) was investigated in patients with disorders mediated by the sympathetic nervous system. SGB is used for the treatment and diagnosis of these disorders; however, a successful objective marker does not exist. Therefore, identifying increased blood flow following SGB and determining whether pulse transit time could be used to verify the success of SBG would be a helpful resource.

BACKGROUND: An objective marker of successful stellate ganglion block (SGB) does not exist. Horner syndrome, which is currently used to determine the effect of SGB, is sometimes ambiguous.

OBJECTIVE: To investigate the change in pulse transit time (PTT) after SGB, and to evaluate the utility of PTT as an objective measure of successful SGB.

METHODS: Eight patients (34 to 62 years of age) underwent SGB for diagnosis or treatment of sympathetically mediated pain of the upper extremities. The success of the SGB was determined according to the presence of Horner syndrome. Electrocardiography, noninvasive blood pressure measurements and pulse oximetry were used to monitor all patients. PTT was measured using data saved on the WinDaq waveform browser.

RESULTS: PTT was measured at baseline and 3 min, 5 min and 10 min after the injection of a local anesthetic. At 3 min after SGB, the mean (± SD) PTT was 624.6±20.5 ms. At 5 min after injection, the mean PTT was 630.8±17.5 ms. Prolonged PTT at 5 min was found to return to the baseline value at 10 min (613.6±14.7 ms). According to the Friedman test, the differences from baseline values were significant (P=0.008).

CONCLUSION: Measurement of PTT at 5 min after local anesthetic injection can help to objectively determine the success of SGB.