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Life sciences · Observational Study
ClinicalTrials.gov · October 13, 2026
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Observational Study.
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Registry record from ClinicalTrials.gov (NCT07871994). This is a study registration, not published results. Lead sponsor: Ankara City Hospital Bilkent. Recruitment status: NOT_YET_RECRUITING. Study type: OBSERVATIONAL. Enrollment: 100 participants (ESTIMATED). Conditions: Obesity (BMI>30). Interventions: PROCEDURE: Ultrasound-guided infraclavicular brachial plexus block. Primary outcome measures: Infraclavicular Block Performance Time , During the preoperative block procedure on the day of surgery, from first block needle insertion to completion of local anesthetic injection.. Brief summary: This study aims to investigate whether body mass index (BMI) is associated with differences in the time needed to perform an ultrasound-guided infraclavicular nerve block and how well the block works. This type of regional anesthesia involves injecting a local anesthetic near the nerves below the collarbone to numb the arm for surgery. The study will include 100 adults undergoing planned hand, wrist, or forearm surgery at Ankara Bilkent City Hospital. Researchers will compare 50 participants with a BMI below 30 kg/m² and 50 participants with a BMI of 30 kg/m² or higher. The study will assess the time needed to perform the block, block success, the time until sensation and movement are blocked, and patient satisfaction. Researchers will also examine whether arm circumference and muscle measurements are associated with block outcomes. This is an observational study. Participants will receive routine anesthesia and surgical care, and their treatment will not be assigned or changed for research purposes.