NCT07474480

Comparison of the Effects of General Anesthesia and Spinal Anesthesia on Tissue Perfusion in Patients Undergoing Lower Extremity Surgery

Comparison of the Effects of Anesthesia Techniques on Tissue Perfusion in Patients Undergoing Lower Extremity Surgery With Tourniquet Use

• Status: Completed
• Phase: —
• Study type: Observational
• Enrollment: 60 (actual)
• Sponsor: Prof. Dr. Cemil Tascıoglu Education and Research Hospital Organization · Academic / Other
• Sex: All
• Age: 18 Years – 65 Years
• Healthy volunteers: —

Summary

This prospective, single-center observational study compares the effects of general anesthesia and spinal anesthesia on tissue perfusion in patients undergoing lower extremity surgery with tourniquet use. Tissue oxygenation in the limb distal to the tourniquet is monitored noninvasively using near-infrared spectroscopy (NIRS), and perfusion loss is quantified using an area-under-the-curve (AUC) approach. The primary objective is to evaluate whether spinal anesthesia better preserves distal tissue oxygenation during tourniquet inflation compared with general anesthesia. Secondary objectives are to assess reperfusion response after tourniquet release using changes in NIRS values at 20 minutes relative to baseline, the presence of early hyperemia (rSO₂ overshoot), and the association between tourniquet duration and perfusion loss. Additional exploratory analyses evaluate selected metabolic and inflammatory markers, including pH, lactate, potassium, and neutrophil-to-lymphocyte ratio.

Conditions

• Tissue Perfusion
• Lower Extremity Surgery
• Tourniquet-Induced Ischemia-Reperfusion Injury
• General Anesthesia

Timeline

• Start date: 2025-03-25
• Primary completion: 2025-09-12
• Completion: 2025-12-25
• First posted: 2026-03-16
• Last updated: 2026-03-18

Locations

1 site across 1 country: Turkey (Türkiye)