Pulse oximeter trick may speed up nerve block checks

This study looked at 80 adults having leg surgery to see if a simple pulse oximeter reading (perfusion index) can quickly tell if a nerve block is working. Normally, doctors check by touching or moving the leg, which takes time and needs the patient's help. The perfusion index measures blood flow changes and might give a faster, more objective answer. The goal is to make nerve block checks easier and more reliable.