A fingertip sensor might foresee blood pressure crashes during spinal anesthesia

This study looks at whether a simple, non-invasive measure called the perfusion index (PI) can predict a sudden drop in blood pressure (hypotension) that often happens during spinal anesthesia for knee surgery. The PI, measured with a standard pulse oximeter on the finger, reflects blood flow and may indicate how susceptible a person is to this side effect. Researchers will monitor 150 healthy adults undergoing knee arthroscopy to see if a higher baseline PI is linked to a higher risk of hypotension. If it is, doctors could use this easy test to identify at-risk patients and take preventive steps.