RESUMEN
OBJECTIVE: To compare IOP changes between spinal anesthesia (SA) and general anesthesia (GA) in patients who underwent lumbar disc surgery in the prone position. DESIGN: Prospective, randomized, controlled trial. SETTING: Operating room. PATIENTS: Forty ASA I-II patients scheduled for lumbar disc surgery in prone position. INTERVENTION: Patients were randomly allocated to the SA or GA groups. MEASUREMENTS: IOP was measured before anesthesia (IOP1), 10â¯min after spinal or general anesthesia in supine position (IOP2), 10â¯min after being placed in the prone position (IOP3), and at the end of the operation in the prone position (IOP4). MAIN RESULTS: There was no significant difference between baseline IOP1 (group GAâ¯=â¯19.4⯱â¯3.2â¯mmHg; group SAâ¯=â¯18.6⯱â¯2.4â¯mmHg) and IOP2 values (group GAâ¯=â¯19.7⯱â¯4.1â¯mmHg; group SAâ¯=â¯18.4⯱â¯1.9â¯mmHg) between and within the groups. IOP values after prone positioning and group GA measurements (IOP3â¯=â¯21.6⯱â¯3.1â¯mmHg; IOP4â¯=â¯33.9⯱â¯3.1â¯mmHg) were significantly higher when compared with the SA group (IOP3â¯=â¯19.3⯱â¯2.7â¯mmHg, IOP4â¯=â¯26.9⯱â¯2.4â¯mmHg) (pâ¯=â¯0.018 and pâ¯<â¯0.001, respectively). Furthermore, IOP3 was significantly increased when compared with IOP2 in the GA group but not in the SA group (pâ¯=â¯0.019 and pâ¯=â¯0.525, respectively). In both groups, IOP4 values were significantly higher than the other three measurements (pâ¯<â¯0.001). CONCLUSION: The results indicated that IOP increase is significantly less in patients who undergo lumbar disc surgery in the prone position under SA compared with GA.