Pulse Wave Transit Time After Infraclavicular Block

This prospective observational study aims to evaluate the time-dependent changes in Pulse Wave Transit Time (PWTT) following ultrasound-guided infraclavicular brachial plexus block. PWTT is a non-invasive hemodynamic parameter reflecting vascular tone and sympathetic nervous system activity. Patients undergoing upper extremity surgery under infraclavicular block will be monitored using standard perioperative monitoring devices. PWTT measurements will be obtained before and after block placement at predefined time intervals. Secondary outcomes will include perfusion index, skin temperature, heart rate, blood pressure, respiratory rate, and oxygen saturation. The study seeks to determine whether PWTT can serve as an objective and non-invasive marker of sympathetic blockade following infraclavicular block.