Study of Femoral Vein Size to Predict Low Blood Pressure During Spinal Anesthesia in Older Adults Having Orthopedic Surgery

What this Trial Is About

This research aims to evaluate whether the transverse diameter of the right common femoral vein RCFV measured by ultrasound can predict the degree of low blood pressure hypotension during spinal anesthesia in elderly patients undergoing elective orthopedic surgery. Spinal anesthesia often causes hypotension, especially in older adults who have reduced heart and blood vessel function. Previous studies mainly focused on pregnant women having cesarean deliveries, so this study seeks to understand its usefulness in a different high-risk group. Participants will have their RCFV diameter measured 1 cm above the junction with the great saphenous vein at the end of expiration using ultrasound before their surgery. The study involves patients scheduled for elective lower-limb orthopedic surgery under spinal anesthesia. No experimental treatments are given, as this is an observational study assessing the relationship between vein diameter and blood pressure changes. During the study, researchers will monitor blood pressure closely up to 15 minutes after spinal anesthesia to assess the predictive ability of the femoral vein diameter. They will also record the severity of hypotension, any adverse events, and the use of rescue medications during the first 24 hours after surgery. Participants will be observed throughout their surgery and recovery period to collect these measurements. The study will last until July 2026, starting in December 2025.

Femoral Vein Diameter to Predict Intraoperative Hypotension in Geriatric Patients Undergoing Orthopedic Surgery Under Spinal Anesthesia