Finger sensor and ultrasound may predict blood pressure danger in shoulder surgery

This study looks at whether two simple, non-invasive tests can predict when a patient's blood pressure will drop dangerously during shoulder surgery performed in the 'beach chair' position (sitting upright). The tests are a finger sensor that measures blood flow and an ultrasound that checks the main vein in the belly. Researchers will study 70 adults having elective shoulder arthroscopy to see how accurate these tests are. The goal is to help doctors prevent complications during surgery.