Posterior capsule rupture with FLACS due to erroneous interpretation of a high OCT intensity area in anterior vitreous

Horiguchi, Hiroshi; Kurosawa, Mei; Shiba, Tadaaki

doi:10.1016/j.ajoc.2020.100811

Cited by 5 publications

(7 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fortunately, the posterior capsular safety margin prevented such severe complications from occurring in the three cases; thus we did not notice any high-risk situations. However, the 474th case had eventually the complication of PCR due to laser irradiation 10 . After experiencing the complication, we started comparing lens thicknesses between intra- and pre-operative measurements before femtosecond laser irradiation.…”

Section: Resultsmentioning

confidence: 99%

“…We had experienced a severe complication at the 474th case during our study. A posterior capsule rupture (PCR) occurred by the direct femtosecond laser irradiation because the line defining the PC misled both an operator and the OCT subsystem of CATALYS to erroneous interpretation 10 . Post this case of PCR due to laser irradiation, we started comparing the lens thickness both as intra- and pre-operatively measured with other devices before the femtosecond laser irradiation.…”

Section: Methodsmentioning

confidence: 99%

“…The PC is the deepest location in the anterior ocular segment and could be measured incorrectly due to any opacity from the cornea to the anterior vitreous. Since a high OCT intensity area in anterior vitreous looked like the PC and misled both an operator and the OCT subsystem of CATALYS to an erroneous interpretation, we experienced a case of PC rupture (PCR) caused by the direct femtosecond laser irradiation 10 though the safety margins for an area of the femtosecond laser irradiation normally work to prevent severe complications even if the PC lines were inappropriately defined.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Inspection of the lens thickness with preoperative biometric measurements prevents an erroneous interpretation of posterior capsule during FLACS

Kurosawa

Horiguchi

Shiba

et al. 2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

Optical opacity reduces quality of biometry images, making it potentially difficult to find the correct location for irradiation during femtosecond laser-assisted cataract surgery (FLACS). After experiencing a case of posterior capsule (PC) rupture because of optical opacity, we started lens thickness (LT) inspection, which indicates comparison of between intra- and pre-operatively measured LT. We retrospectively investigated the effectiveness of the LT inspection. One observer reviewed all FLACS treatment summaries for 3 years by CATALYS in the Jikei University Hospital, Tokyo. Based on the lines defining the PC on intraoperative OCT images, all cases were classified into three groups: undescribed, appropriate and inappropriate PC. Among the 1070 cases, 1047 cases had appropriate PC. In 19 cases, the PC line was undescribed because of dense cataract. Among 474 cases with no inspection, 4 cases had an inappropriate PC. Whereas, in 596 cases with the LT inspection, there was no case of an inappropriate PC. LT inspection significantly reduced the cases with inappropriate PC. The safety margins normally work to prevent severe complications. However, rare outlier cases had a high risk of severe complications. We propose LT inspection could be the most practical and convenient way for safety surgery.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inspection of the lens thickness with preoperative biometric measurements prevents an erroneous interpretation of posterior capsule during FLACS

Kurosawa

Horiguchi

Shiba

et al. 2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…FLAC can simulate structures made of soil, rock, and other materials that flow plastically when reaching their yield limits [45]. FLAC adopts the finite difference scheme to solve the governing differential equation, which can accurately simulate the yield, plastic flow, softening, and large deformation of materials, especially has unique advantages in the fields of elastic-plastic analysis, large deformation analysis, and simulation of construction process [46]. A finite difference model of the embankment fill-soil foundation system of the research object was established by using FLAC.…”

Section: Response Surface Methodsmentioning

confidence: 99%

Embankment Seismic Fragility Assessment under the Near‐Fault Pulse‐like Ground Motions by Applying the Response Surface Method

Che

Yin

Zhou

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

Uncertainties of the ground motions and structural parameters are the main factors that limit the accuracy of embankment seismic fragility assessment. In response to the uncertainties of the ground motions, artificial synthesizing method of the near-fault pulse-like ground motions was proposed, and 15 ground motions with the rupture fault distances ranging from 1 to 15 km were synthesized by taking the Chi-Chi earthquake in Taiwan, China, as an example. The Xi’an-Baoji expressway K1125 + 470 embankment was taken as the research object, and a total of 12 structural parameters were selected as the design variables, namely, the elastic modulus, bulk modulus, shear modulus, density, cohesion force, and internal friction angle of the embankment fill and soil foundation, respectively. In response to the uncertainties of these parameters, 3 principal components with large impacts on the embankment seismic fragility were extracted based on the principal component analysis. Mapping relationships among the principal components and embankment seismic damages were analyzed using the uniform design response surface method, and the seismic fragility assessment was carried out and the fragility curves were plotted. The research results are consistent with the actual embankment seismic damage conditions of the Chi-Chi earthquake, indicating that the proposed method is scientific and reasonable. It also shows that it would obviously overestimate the seismic performance in the embankment seismic fragility assessment without considering the uncertainties of the ground motions and structural parameters.

show abstract

“…We had experienced a severe complication at the 474th case during our study. A posterior capsule rupture (PCR) occurred by the direct femtosecond laser irradiation because the line de ning the PC misled both an operator and the OCT subsystem of CATALYS® to erroneous interpretation 10 . Post this case of PCR due to laser irradiation, we started comparing the lens thickness both as intra-and pre-operatively measured with other devices before the femtosecond laser irradiation.…”

Section: Biometric Measurementsmentioning

confidence: 99%

Inspection of the Lens Thickness With Preoperative Biometric Measurements Prevents an Erroneous Interpretation of Posterior Capsule During FLACS

Kurosawa

Horiguchi

Shiba³

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

Purpose: Optical opacity reduces quality of biometry images, making it potentially difficult to find the correct location for irradiation during femtosecond laser-assisted cataract surgery (FLACS). After experiencing a case of posterior capsule (PC) rupture because of optical opacity, we started lens thickness (LT) inspection, which indicates comparison of between intra- and pre-operatively measured LT. We retrospectively investigated the effectiveness of the LT inspection. Methods: One observer reviewed all FLACS treatment summaries for 3 years by CATALYS® in the Jikei University Hospital, Tokyo. Based on the lines defining the PC on intraoperative OCT images, all cases were classified into three groups: undescribed, appropriate and inappropriate PC. Results: Among the 1070 cases, 1047 cases had appropriate PC. In 19 cases, the PC line was undescribed because of dense cataract. Among 474 cases with no inspection, 4 cases had an inappropriate PC. Whereas, in 596 cases with the LT inspection, there was no case of an inappropriate PC. LT inspection significantly reduced the cases with inappropriate PC.Conclusions: The safety margins normally work to prevent severe complications. However, rare outlier cases had a high risk of severe complications. We propose LT inspection could be the most practical and convenient way for safety surgery.

show abstract

Posterior capsule rupture with FLACS due to erroneous interpretation of a high OCT intensity area in anterior vitreous

Cited by 5 publications

References 9 publications

Inspection of the lens thickness with preoperative biometric measurements prevents an erroneous interpretation of posterior capsule during FLACS

Inspection of the lens thickness with preoperative biometric measurements prevents an erroneous interpretation of posterior capsule during FLACS

Embankment Seismic Fragility Assessment under the Near‐Fault Pulse‐like Ground Motions by Applying the Response Surface Method

Inspection of the Lens Thickness With Preoperative Biometric Measurements Prevents an Erroneous Interpretation of Posterior Capsule During FLACS

Contact Info

Product

Resources

About