Patient Positioning. Case reports suggest that patient positioning
resulting in direct pressure to eyes (e.g., from the use
of a headrest, sheet roll, or other device) may precede the
onset of CRAO or retinal ischemia in spine surgery patients
(Category B3 evidence).#13–16,25,33–42 One observational
study indicates that, in 19% of ION cases listed in the ASA
Visual Loss Registry, patient head position was maintained
with May field pins with the eyes free of pressure (Category
B2 evidence).
Patient Positioning. Case reports suggest that patient positioningresulting in direct pressure to eyes (e.g., from the useof a headrest, sheet roll, or other device) may precede theonset of CRAO or retinal ischemia in spine surgery patients(Category B3 evidence).#13–16,25,33–42 One observationalstudy indicates that, in 19% of ION cases listed in the ASAVisual Loss Registry, patient head position was maintainedwith May field pins with the eyes free of pressure (CategoryB2 evidence).
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