Zacharias Jaime, Zacharias Sergio
Clínica Oftalmológica Pasteur, Santiago, Chile.
J Cataract Refract Surg. 2005 Oct;31(10):1976-82. doi: 10.1016/j.jcrs.2005.03.061.
To propose an alternative method to characterize postocclusion surge using a collapsible artificial anterior chamber to replace the currently used rigid anterior chamber model.
Fundación Oftamológica Los Andes, Santiago, Chile.
The distal end of a phacoemulsification handpiece was placed inside a compliant artificial anterior chamber. Digital recordings of chamber pressure, chamber volume, inflow, and outflow were performed during occlusion break of the phacoemulsification tip. The occlusion break profile of 2 different consoles was compared.
Occlusion break while using a rigid anterior chamber model produced a simultaneous increase of chamber inflow and outflow. In the rigid chamber model, pressure decreased sharply, reaching negative pressure values. Alternatively, with the collapsible chamber model, a delay was observed in the inflow that occurs to compensate the outflow surge. Also, the chamber pressure drop was smaller in magnitude, never undershooting below atmospheric pressure into negative values. Using 500 mm Hg as vacuum limit, the Infiniti System (Alcon) performed better that the Legacy (Alcon), showing an 18% reduction in peak volume variation.
The collapsible anterior chamber model provides a more realistic representation of the postocclusion surge events that occur in the real eye during cataract surgery. Peak volume fluctuation (mL), half volume recovery time(s), and volume fluctuation integral value (mL x s) are proposed as realistic indicators to characterize the postocclusion surge performance. These indicators show that the Infiniti System has a better postocclusion surge behavior than the Legacy System.
提出一种替代方法，使用可折叠人工前房来表征阻塞后浪涌，以取代目前使用的刚性前房模型。
智利圣地亚哥的安第斯眼科基金会。
将超声乳化机头的远端置于顺应性人工前房内。在超声乳化针头阻塞解除期间，对房压、房容积、流入量和流出量进行数字记录。比较了2种不同控制台的阻塞解除曲线。
使用刚性前房模型时，阻塞解除会导致房流入量和流出量同时增加。在刚性房模型中，压力急剧下降，达到负压值。相反，使用可折叠房模型时，观察到流入量出现延迟，以补偿流出浪涌。此外，房压降幅度较小，从未低于大气压进入负值。以500mmHg作为真空极限，Infiniti系统（爱尔康）的表现优于Legacy（爱尔康），峰值容积变化减少了18%。
可折叠前房模型能更真实地反映白内障手术中真实眼睛发生的阻塞后浪涌事件。建议将峰值容积波动（mL）、半容积恢复时间（s）和容积波动积分值（mL×s）作为表征阻塞后浪涌性能的实际指标。这些指标表明，Infiniti系统的阻塞后浪涌行为优于Legacy系统。
