text: CONCLUSION
  Intra-operative monitoring of partial pressure of tissue oxygen (PtiO2 ) is a very sensitive method of detecting the decrease of oxygen for cell utilization, due to decreased blood flow, during temporary clipping and after definitive clipping, in middle cerebral artery incidental unruptured aneurysm surgery. "Basal values", obtained without the influence of subarachnoid blood, were lower than expected in "uninjured" brain, and this fact, although unexplained, should be kept in mind in future investigation in this field. Although values that could be predictive of brain ischemia could not be established, an incomplete recovery or continuous decrease in PtiO2 values after definitive clipping should be considered an indicator of high risk for the development of post-operative brain infarction, and, therefore, an indication for verification of the position of the clip.
  
entities: ['tissue']
entities: Tissue
entities: PMC-3086171-sec-12_T1
entities: ['cell']
entities: Cell
entities: PMC-3086171-sec-12_T2
entities: ['blood']
entities: Organism_substance
entities: PMC-3086171-sec-12_T3
entities: ['cerebral artery']
entities: Multi-tissue_structure
entities: PMC-3086171-sec-12_T4
entities: ['aneurysm']
entities: Pathological_formation
entities: PMC-3086171-sec-12_T5
entities: ['subarachnoid blood']
entities: Organism_substance
entities: PMC-3086171-sec-12_T6
entities: ['brain']
entities: Organ
entities: PMC-3086171-sec-12_T7
entities: ['brain']
entities: Organ
entities: PMC-3086171-sec-12_T8
entities: ['brain']
entities: Organ
entities: PMC-3086171-sec-12_T9