Results
POSTERIOR FOSSA TUMOR
A total of 46 patients (50% females) were randomized to either MF fresh gas (24 patients) or NF (22 patients) anesthesia. The mean age of the whole study group was 50.3 ± 15.1 years. Fourteen operations (30.4%) were performed by orthopedists, while 32 operations (69.6%) were carried out by neurosurgeons. All of the orthopedic procedures were posterior instrumentation. Neurosurgical procedures involved lumbar disk hernia surgery (18 patients), posterior stabilization (10 patients), posterior fossa tumor surgery (2 patients), and thoracal laminectomy (2 patients).