Prevention of Perioperative Vision Loss in Lumbar Spine Surgery

Patient Positioning and Ocular Protection

• The American Society of Anesthesiologists recommends meticulous positioning of the head, continuous hemodynamic monitoring, and aggressive management of anemia to prevent perioperative vision loss in high-risk patients undergoing lumbar spine surgery in the prone position, especially those with procedures lasting more than 4 hours or significant blood loss exceeding 800 mL 1, 2.
• High-risk patients are those with prolonged procedures (>4 hours) or substantial blood loss (>800 mL), and both factors present simultaneously 1, 2, 3, 4.
• Position the head at or above the level of the heart when possible to reduce the risk of posterior ischemic optic neuropathy (PION) 1, 4, 5.
• Maintain the head in a neutral position without significant flexion, extension, lateral flexion, or rotation of the neck 1, 4, 6.
• Avoid any direct pressure on the eyes to prevent retinal artery occlusion (RAO) 1, 7, 4.
• Periodically check the position of the eyes during surgery to ensure the head has not moved and there is no ocular compression 1, 5, 9.

Hemodynamic Management

• Evaluate the patient's baseline blood pressure before surgery 1, 5, 9.
• Continuously monitor systolic blood pressure in high-risk patients 1, 5, 9.
• Determine on a case-by-case basis whether to use deliberate hypotension in high-risk patients, considering the risks of optic nerve ischemia 1, 5.
• Adrenergic agonists may be used on a case-by-case basis when necessary to correct hypotension 1, 7, 6.

Blood Loss and Fluid Management

• Periodically monitor hemoglobin or hematocrit values during surgery in high-risk patients experiencing significant blood loss 1, 5, 9.
• There is no documented lower limit of hemoglobin concentration associated with the development of perioperative vision loss; therefore, no transfusion threshold can be established to eliminate the risk 1.
• Use blood transfusions as deemed appropriate 1, 5.
• Crystalloids or colloids alone or in combination may be used to maintain adequate replacement or intravascular volume 1, 7, 5.

Postoperative Management

• Evaluate the vision of high-risk patients when they are alert after surgery 1.
• The American Society of Anesthesiologists recommends against the administration of corticosteroids, antiplatelet agents, or intraocular pressure-lowering agents in the treatment of ischemic optic neuropathy if vision loss occurs 1.