The effect of anesthesia type on intraocular pressure for lumbar surgery operations.

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Prone position can increase intraocuar pressure especially for lumbar surgery. Many studies evaluated intraocular pressure in patients under general anesthesia. But there is not a study examinig patient under spinal anesthesia. In this study our aim is to investigate effects of spinal and general anesthesia on lumbar discectomy patients in prone position. 40 ASA I-III patients over 18 years old who undergo lumbar disc surgery patients will paritcipate study. Eye illness, eye surgery history, beta blocker drug usage, local anesthetic allergy are exclusion criterias. we record heigt, weight, hypertension or diabetes mellitus existence. We randomize patients in two groups. 1) Spinal anesthesia group 2) General anesthesia group We both measure intraocular pressure of both eyes each group when patients are supin position with portable tonometer. After that, we will perform spinal anesthesia with 15 mg hiperbaric bupivacaine from L3-4 lumbar interspace for spinal group and general anesthesia induction with fentanyl 2mcg/kg i.v., propofol 2 mg /kg i.v. and rocuronium 0.6 mg/kg for general anesthesia group patients and maintain anesthesia with 2% sevoflurane i.v.. We measure intraocular pressure after anesthesia at 10th minute, 10 minutes after prone positioning and at the end of the operation at prone position. We will record mean arterial pressure, at intraocular pressure measurements time, We will ask patients at first postoperative day if they have any visual disturbances. We compare the results of intraocular pressures and evaluate with appropriate statistical methods.

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