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Changes in intraocular pressure in anesthetized prone patients
Katharine Hunt1, Rahul Bajekal, Ian Calder
1Department of Anaesthesia, National Hospital for Neurology and Neurosurgery, London, UK. Kath.Hunt@dial.pipex.com
Journal of Neurosurgical Anesthesiology
|November 24, 2004
Summary
Intraocular pressure (IOP) significantly increases when patients undergoing spinal surgery are placed in the prone position. This finding is crucial for understanding and preventing postoperative visual loss in such surgical cases.
Area of Science:
- Ophthalmology
- Anesthesiology
- Neurosurgery
Background:
- Postoperative visual loss is a recognized complication, particularly in prone patients.
- Elevated intraocular pressure (IOP) is a suspected mechanism leading to ischemic oculopathy.
Purpose of the Study:
- To quantify intraocular pressure (IOP) changes in patients positioned prone for spinal surgery.
- To investigate the relationship between IOP and surgical factors.
Main Methods:
- Intraocular pressure (IOP) was measured in 20 patients before intubation, after pronation, and at the end of surgery.
- Data on surgery duration, head stabilization methods, and physiological parameters were collected.
Main Results:
- Median IOP was significantly higher in the prone position compared to the supine position (P < 0.001).
- No correlation was found between IOP rise and surgery duration, age, or BMI.
- Head support on pillows showed a trend towards higher IOP compared to pin fixation.
Conclusions:
- Anesthetized patients exhibit increased intraocular pressure (IOP) when placed in the prone position.
- Findings highlight the importance of monitoring IOP in prone surgical patients to mitigate risks of visual complications.