RESUMO
OBJECTIVE: The administration of interscalene block (ISB) may lead to several hemodynamic effects, likely due to the diffusion of local anesthetic to nearby structures such as carotid sinus baroreceptors. This study aimed to compare hemodynamic and respiratory changes resulting from right and left-sided ISB. PATIENTS AND METHODS: A retrospective analysis was conducted on adults who had ultrasound-guided ISB for upper limb surgery between January 2020 and December 2021. All patients had ISB with bupivacaine 0.5% and lidocaine 2% mixture following premedication. Demographic data, arterial blood pressure, heart rate, and peripheral oxygen saturation (SpO2) were measured before and after the block at regular intervals. Block characteristics, surgical and post-anesthesia care unit (PACU) durations, intraoperative analgesic requirements, and side effects were analyzed. RESULTS: A total of 94 patients had ISB for upper limb surgery, 54 for the right and 40 for the left-sided surgeries. Patients' data were analyzed in two groups according to the block side. Increased arterial blood pressure was observed in both groups after the block compared to the control values. Systolic arterial pressure from 10 to 30 minutes, diastolic arterial pressure at the 25th minute, and mean arterial pressure at the 15th, 20th, and 25th minutes were significantly higher on the right-sided blocks. Heart rate, SpO2, analgesic requirements, block characteristics, and PACU durations did not differ between the groups. CONCLUSIONS: Ultrasound-guided ISB-applied patients demonstrated increased blood pressure compared to control values. This increase, without concurrent changes in heart rate, was more pronounced in right-sided ISB. These findings indicate that careful hemodynamic monitoring is necessary whenever hypertension should be avoided for the patients.
