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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.
