RESUMEN
OBJECTIVE: To compare anesthesia quality and sevoflurane consumption during standard and extended intraoperative monitoring. MATERIALS AND METHODS: 74 patients were included in prospective randomized study. Patients had spinal pathology of varying severity, extension and localization. A comparative evaluation of standard and extended (with entropy) monitoring was performed during low-flow inhalation anesthesia with the automated control of the anesthetic concentration and exhaled oxygen fraction (Et-control). RESULTS: Monitoring depth of anesthesia based on entropy enables more accurate dosing of inhaled anesthetics. CONCLUSIONS: The study revealed that the use of entropy monitoring in high-risk surgery alleviates providing the controlled anesthesia with the optimal inhalation anesthetic concentration and minimal hemodynamic reactions of the patient.