The study was designed to evaluate the effects of changing patient's position on intraocular pressure HOP) during spine surgery, and to study the effect of Preoperative diuretic injection. The study comprised 45 ASA grade I and II, patients assigned to undergo spine surgery under general anesthesia. Patients were divided into three equal groups; group I and II assigned to undergo surgery in prone position, but group I received intra venous mannitol 0.5gr. /kg, 1/2 an hour before induction of anesthesia, and group III assigned to undergo surgery in lateral position. (IOP-q) was measured before premedication, OOP^) after induction in the supine posi tion. (IOP2I 1/2 hr. after position change. (IOP3I at the end ofsulgery be fore position change. (IOP^) before emergence from anesthesia, but after return to supine position. At each estimation of IOP, mean arterial pres sure (MAP) and heart rate (HR) were recorded. The length of time in prone position was measured. Transposition from supine resulted in significant (P<0.05) hemodynamic changes in prone position and nonsignificant (P>0.05) in lateral position. IOP2 was significantly (P<0.05) higher com pared both to IOPq and lOP^ but, transfer to lateral position, despite re sulting in increased IOP compared to their IOPB and IOP1. induced a sig nificantly (P<0.05) decrease of IOP compared to groups I and II. IOP still progressively increased in group H with a significant (P<0.05) difference compared to the other two groups, maintenance of lateral position result ed in progressively decreased IOP. Return to supine position resulted in decreased IOP in the three group |
