• Hüseyin Ulaş Pınar, Zümrüt Ela Arslan Kaşdoğan, Betül Başaran, İlker Çöven, Ömer Karaca, and Rafi Doğan.
• Department of Anesthesiology and Reanimation, Baskent University Konya Research Center, Konya, Turkey. Electronic address: ulasp@baskent.edu.tr.
• J Clin Anesth. 2018 May 1; 46: 54-58.

ObjectiveTo compare IOP changes between spinal anesthesia (SA) and general anesthesia (GA) in patients who underwent lumbar disc surgery in the prone position.DesignProspective, randomized, controlled trial.SettingOperating room.PatientsForty ASA I-II patients scheduled for lumbar disc surgery in prone position.InterventionPatients were randomly allocated to the SA or GA groups.MeasurementsIOP was measured before anesthesia (IOP1), 10 min after spinal or general anesthesia in supine position (IOP2), 10 min after being placed in the prone position (IOP3), and at the end of the operation in the prone position (IOP4).Main ResultsThere was no significant difference between baseline IOP1 (group GA = 19.4 ± 3.2 mmHg; group SA = 18.6 ± 2.4 mmHg) and IOP2 values (group GA = 19.7 ± 4.1 mmHg; group SA = 18.4 ± 1.9 mmHg) between and within the groups. IOP values after prone positioning and group GA measurements (IOP3 = 21.6 ± 3.1 mmHg; IOP4 = 33.9 ± 3.1 mmHg) were significantly higher when compared with the SA group (IOP3 = 19.3 ± 2.7 mmHg, IOP4 = 26.9 ± 2.4 mmHg) (p = 0.018 and p < 0.001, respectively). Furthermore, IOP3 was significantly increased when compared with IOP2 in the GA group but not in the SA group (p = 0.019 and p = 0.525, respectively). In both groups, IOP4 values were significantly higher than the other three measurements (p < 0.001).ConclusionThe results indicated that IOP increase is significantly less in patients who undergo lumbar disc surgery in the prone position under SA compared with GA.Copyright © 2018 Elsevier Inc. All rights reserved.

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