Impact of Local Anesthetic Volume During Ultrasound-guided Stellate Ganglion Block

Well trained pain physician performs all the ultrasound(US)-guided stellate ganglion block(SGB)s, who is not involved in evaluating study variables. Electrocardiography, noninvasive blood pressure, heart rate, and peripheral oxygen saturation were monitored for all patients before, while, and after conducting procedure. For US-guided SGB, patients are supine positioned, and skin preparation on injection site is done with chlorohexidine. Procedure is conducted under ultrasound guidance at C6 level. 4 ml, 6 ml, and 8 ml of 1% lidocaine is injected for the each group, respectively.