Comparison of Continuous and Programmed Intermittent Bolus Infusion of 0.2% Ropivacaine after Ultrasound-Guided Continuous Interscalene Brachial Plexus Block in Arthroscopic Shoulder Surgery.

"Conflicts of Interest The authors declare that they have no conflicts of interest."

"This work was supported by a 2-year research grant of Pusan National University."

"This study was approved by the Institutional Review Board of Pusan National University Yangsan Hospital (approval number: 05–2020-089), and the trial was registered with the Clinical Research Information Service (registration number: KCT0005197). After obtaining written informed consent, 64 patients aged >19 years with American Society of Anesthesiologists physical status I–II scheduled for elective arthroscopic shoulder surgery were enrolled. Patients who did not understand or could not participate in the study process, had a blood coagulation deficiency, neurological defects at the procedure site, allergic reaction to ropivacaine in previous surgery or procedures, or were pregnant women were excluded."