Al-Khateeb Ghada, Shajari Mehdi, Vunnava Krishnapoojita, Petermann Kerstin, Kohnen Thomas
Department of Ophthalmology, Goethe-University, Frankfurt/Main, Germany.
Department of Ophthalmology, Goethe-University, Frankfurt/Main, Germany.
Can J Ophthalmol. 2017 Aug;52(4):331-337. doi: 10.1016/j.jcjo.2017.01.004. Epub 2017 Feb 20.
The aim of this study was to find the correlation between lens densitometry measurements using Pentacam Scheimpflug imaging system with equivalent average ultrasound power and cumulative dissipated energy (CDE) in femtosecond laser-assisted lens surgery (FLALS).
One hundred and twenty-four eyes were analyzed retrospectively, of which 109 had undergone cataract surgery and 15 had received refractive lens exchange with FLALS. Using the Pentacam Nucleus Staging (PNS) lens densitometry program, preoperative mean lens density and cataract grading score were evaluated. Average ultrasound power and CDE were recorded during surgery and correlated with the PNS grading and average lens density value. Exclusion criteria included small pupil size, previous ocular surgeries, tumors, optic atrophy, corneal scarring, intraoperative capsular rupture, and zonular dehiscence.
Preoperative average lens density compared with CDE showed a weak significant positive linear correlation (p < 0.0001). CDE increased as lens density increased. This was also noticed when CDE and ultrasound time were compared with the PNS grading, demonstrating a significant moderate correlation (p < 0.0001). With increasing average lens density, the equivalent average ultrasound power showed a positive correlation (p < 0.0001). A weak positive correlation between estimated fluid use and PNS was also observed (p < 0.0001). Forty-one cases that did not require ultrasound energy during phacoemulsification had a PNS score between 0 and 1.
The Centurion Phacoemulsification machine has been shown to correlate positively with the Pentacam Scheimpflug System offering an objective and repeatable measure of lens density and cataract grading. This can aid in intraoperative phacodynamics and help reduce phacoemulsification complications, such as corneal endothelial injury.
本研究旨在探讨在飞秒激光辅助晶状体手术（FLALS）中，使用Pentacam Scheimpflug成像系统测量晶状体密度与等效平均超声功率和累积耗散能量（CDE）之间的相关性。
回顾性分析124只眼，其中109只接受了白内障手术，15只接受了FLALS屈光性晶状体置换术。使用Pentacam晶状体核分级（PNS）晶状体密度测量程序，评估术前平均晶状体密度和白内障分级评分。记录手术期间的平均超声功率和CDE，并将其与PNS分级和平均晶状体密度值进行相关性分析。排除标准包括瞳孔过小、既往眼部手术史、肿瘤、视神经萎缩、角膜瘢痕、术中囊膜破裂和悬韧带松弛。
术前平均晶状体密度与CDE呈弱显著正线性相关（p < 0.0001）。CDE随晶状体密度增加而增加。当将CDE和超声时间与PNS分级进行比较时也观察到了这一点，显示出显著的中度相关性（p < 0.0001）。随着平均晶状体密度的增加，等效平均超声功率呈正相关（p < 0.0001）。还观察到估计的液体使用量与PNS之间存在弱正相关（p < 0.0001）。41例在超声乳化过程中不需要超声能量的病例，其PNS评分为0至1。
已证明Centurion超声乳化机与Pentacam Scheimpflug系统呈正相关，可提供客观且可重复的晶状体密度测量和白内障分级。这有助于术中超声乳化动力学，并有助于减少超声乳化并发症，如角膜内皮损伤。
