Evaluating Baseline Perfusion Index to Predict Low Blood Pressure Caused by Spinal Anesthesia in Healthy Adults Undergoing Knee Arthroscopy

What this Trial Is About

This research aims to study how the baseline perfusion index PI can predict spinal anesthesia-induced hypotension in healthy adults having day-case knee arthroscopy. Spinal anesthesia is commonly used for lower limb surgeries, but it often causes blood pressure drops due to sympathetic nerve blockage. Traditional risk factors like age and baseline blood pressure do not always predict this well in healthy patients. The perfusion index, measured non-invasively with pulse oximetry, reflects blood vessel tone and sympathetic activity and may help identify those at higher risk for low blood pressure during surgery. Participants will be observed without receiving experimental treatments. The study will measure baseline PI before spinal anesthesia and monitor blood pressure changes during surgery. Researchers will track episodes of hypotension defined by specific blood pressure criteria and also record the timing of sensory block onset and the use of medications like ephedrine and fluids during the procedure. During the study, participants will undergo standard care for knee arthroscopy with spinal anesthesia. Researchers will collect data on blood pressure, sensory block timing, and medication use during the surgery. The main focus is to see how well baseline PI predicts hypotension during the operation. The study will continue until the primary outcome is assessed during surgery, with follow-up data collected to understand secondary outcomes related to anesthesia effects and treatment needs.

Perfusion Index and Spinal Hypotension in Day-Case Knee Arthroscopy