The change in regional cerebral oxygen saturation after stellate ganglion block

Hyeon Min Park, Tae Wan Kim, Hong Gyu Choi, Kyung Bong Yoon, Duck Mi Yoon, Hyeon Min Park, Tae Wan Kim, Hong Gyu Choi, Kyung Bong Yoon, Duck Mi Yoon

Abstract

Background: Stellate ganglion block (SGB) is known to increase blood flow to the innervations area of the stellate ganglion. Near infrared spectroscopy reflects an increased blood volume and allows continuous, non-invasive, and bedside monitoring of regional cerebral oxygen saturation (rSO(2)). We investigated the influence of SGB on bilateral cerebral oxygenation using a near infrared spectroscopy.

Methods: SGB was performed on 30 patients with 1% lidocaine 10 ml using a paratracheal technique at the C6 level and confirmed by the presence of Horner's syndrome. The blood pressure (BP), heart rate (HR) and rSO(2) were measured before SGB and 5, 10, 15 and 20 minutes after SGB. Tympanic temperature of each ear was measured prior to SGB and 20 minutes after SGB.

Results: The increments of the rSO(2) on the block side from the baseline were statistically significant at 5, 10, 15 and 20 minutes. The rSO(2) on the non-block side compared with the baseline, however, decreased at 15 and 20 minutes. The difference between the block and the non-block sides was significant at 15 and 20 minutes. The BP at 10, 15 and 20 minutes was increased and the HR was increased at 10 and 15 minutes.

Conclusions: We observed an increment of the rSO(2) on the block side from the baseline; however, the rSO(2) on the non-block side decreased.

Keywords: near infrared spectroscopy; regional cerebral oxygen saturation; stellate ganglion block.

Figures

Fig. 1
Fig. 1
Changes in mean blood pressure (mBP; A) and heart rate (HR; B) were assessed for 20 minutes, at 5 minute intervals after completion of stellate ganglion block. The mBP and HR were increased as compared with the baseline values. Data are expressed as mean ± SD. *P < 0.05 as compared with the baseline values in (A, B).
Fig. 2
Fig. 2
Changes in regional cerebral oxygen saturations (rSO2) were assessed for 20 minutes, at 5 minute intervals after completion of stellate ganglion block. The rSO2 from the baseline on the block side increases significantly, but on the non-block side decreases slightly. Data are expressed as ± SD. *P < 0.05 as compared with the baseline values and †P < 0.01 as compared between the block side and non-block side.

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