Comparison of Free-Beam- and Fiber-Type CO2 Laser Delivery Systems in Stapes Surgery
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Background and Objectives: A free-beam-type CO2 laser, which use a micromanipulatormounted on a microscope as the delivery system, has the merit of not being affected byhand tremor at the time of shooting. However, this delivery system has several disadvantages,including a restricted operation range and a risk of incorrect focusing. A fiber-type CO2 laseruses a hand-held delivery system and has the opposite merits and demerits. We comparedthe results of stapes surgery with free-beam and fiber type delivery systems. Subjectsand Methods: The study enrolled 36 patients who underwent stapedotomy with free-beam-(n=26) or fiber- (n=10) type CO2 lasers. The air-bone (AB) gap closure, bone conduction (BC)change, and operating time were evaluated. The AB gap closure was calculated by subtractingthe preoperative BC thresholds from the postoperative air conduction thresholds. The BC change was calculated by subtracting the postoperative BC thresholds from thepreoperative BC thresholds. Results: The mean operating time was significantly (p=0.035)shorter in the fiber-type group (72.5±8.2 min) than in the free-beam-type group (80.5±11.4min). The mean AB gap closure did not differ significantly (p=0.297) between the free-beamandfiber-type groups (5.8±10.1 and 1.4±6.8 dB, respectively). The mean BC change didnot differ significantly (p=0.873) between the free-beam- and fiber-type groups (2.4±6.9 and2.8±5.3 dB, respectively). The hearing outcomes did not differ significantly between the twogroups. Conclusions: Operating times were significantly shorter using the fiber-type CO2 laser,while hearing outcomes did not differ significantly between the two groups.
Abstract
Background and Objectives: A free-beam-type CO2 laser, which use a micromanipulatormounted on a microscope as the delivery system, has the merit of not being affected byhand tremor at the time of shooting. However, this delivery system has several disadvantages,including a restricted operation range and a risk of incorrect focusing. A fiber-type CO2 laseruses a hand-held delivery system and has the opposite merits and demerits. We comparedthe results of stapes surgery with free-beam and fiber type delivery systems. Subjectsand Methods: The study enrolled 36 patients who underwent stapedotomy with free-beam-(n=26) or fiber- (n=10) type CO2 lasers. The air-bone (AB) gap closure, bone conduction (BC)change, and operating time were evaluated. The AB gap closure was calculated by subtractingthe preoperative BC thresholds from the postoperative air conduction thresholds. The BC change was calculated by subtracting the postoperative BC thresholds from thepreoperative BC thresholds. Results: The mean operating time was significantly (p=0.035)shorter in the fiber-type group (72.5±8.2 min) than in the free-beam-type group (80.5±11.4min). The mean AB gap closure did not differ significantly (p=0.297) between the free-beamandfiber-type groups (5.8±10.1 and 1.4±6.8 dB, respectively). The mean BC change didnot differ significantly (p=0.873) between the free-beam- and fiber-type groups (2.4±6.9 and2.8±5.3 dB, respectively). The hearing outcomes did not differ significantly between the twogroups. Conclusions: Operating times were significantly shorter using the fiber-type CO2 laser,while hearing outcomes did not differ significantly between the two groups.
참고문헌 (9)
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