Comparative Analysis of Cerebral Oximetry and Mean Arterial Pressures at the Cerebral Level in the Beach Chair Position

Exclusion Criteria

• •Subject has a mental condition that may interfere with the subject's ability to give informed consent or willingness to fulfill the study requirements (i.e., severe mental retardation such that the subject cannot understand the informed consent process, global dementia, prior strokes that interfere with Subject's cognitive abilities, senile dementia, and Alzheimer's Disease)
• •Subject is younger than 18 years of age at consent
• •Subject is pregnant
• •Subject is a prisoner