Tourniquet-induced tissue hypoxia characterized by near-infrared spectroscopy during ankle surgery: An observational study

Pneumatic tourniquet inflation during extremity surgery leads to profound and prolonged tissue ischemia. Its effect on tissue oxygenation is inadequately studied. Methods: Patients undergoing elective ankle surgery with tourniquet application participated in this observational cohort study. Somatic and cerebral tissue oxygen saturation (SstO2 and SctO2) were monitored using tissue nearinfrared spectroscopy.