The effects of interscalene block performed alone or with ultrasonography-guided peripheric nerve stimulator on block success, hemodynamic parameters and perfusion index

Objective: We aimed the comparison between traditional methods and perfusion index (PI) on evaluating the block success and sufficiency of interscalene block that we applied to shoulder surgery cases by using ultrasonography (USG) and peripheric nerve stimulator or only peripheric nerve stimulator only. Material and Methods: After ethics committee and patient approvals; ASA I-III, 50 adult patients (18-70 ages) who underwent shoulder, arm surgery were allocated to this prospective research. Interscalene block was applied to all patients by using USG and peripheric nerve stimulation or peripheric nerve stimulation with bupivacaine 0.5% 1 mg/kg+prilocaine 2% 4 mg/kg+NaCl 0.9% to complete the anesthetic solution to 30 mlt. We recorded heart rate, mean arterial pressure, peripheric oxygen saturation, PI, motor block times and pin-prick test values of the patients. Results: When the PI values of the patients on different times were compared, the difference between the groups was insignificant. Loss of cold sensation time was 10.3±3.9 min in Group 1 and 11.3±4.3 min in Group 2. Pin-prick test time to be positive was 16.3±3.8 min in Group 1 and 17.6±5.1 min in Group 2. Motor block onset time was 14.2±3.7 min in Group 1 and 16.1±4.3 min in Group 2. Conclusion: Using USG enables us to benefit from local anesthetic more effectively and to encounter fewer complications. Another conclusion can be about PI parameters which significantly increase with block success in time within the groups. So, PI can be used due to being easily applicable and non-invasive technique for predicting the block success. © 2020 OrtadogŸu Reklam Tanitim Yayincilik Turizm Egitim Insaat Sanayi ve Ticaret A.S.. All rights reserved.