A New and Easier Approach to Preserflo MicroShunt Implantation.

PRESERFLO™ MicroShunt is a new minimally invasive glaucoma surgical (MIGS) device, implanted with an ab externo approach, which drains the aqueous humor to the subconjunctival space. It has been designed as a safer and less invasive approach for treating medically uncontrolled primary open-angle glaucoma (POAG) patients. The classic way of MicroShunt implantation involves different key steps, which includes creating a small scleral pocket with a 1mm blade; passing a 25-gauge (25G) needle through the scleral pocket into the anterior chamber (AC); and subsequently flushing the stent with a 23-gauge (23G) thin-wall cannula. However, sliding the needle into the scleral pocket can create false passages, thus making the device's threading more difficult. The purpose of the current paper is to propose a simplified implantation approach. Our method proposes to make the scleral tunnel by using directly the 25G needle and, at the limbus, this 25G needle is used to slightly depress the sclera and enter into the AC. The MicroShunt is subsequently assembled on a 23G cannula mounted on a 1mL syringe. The syringe can then be used to flush the device. Outflow can thus be confirmed immediately by seeing drops of aqueous humor leaking from the external opening of the stent. This new approach may have different potential advantages, such as better control of the site of entry, avoids wrong passages, reduces or eliminates the risk of aqueous humor sideway flow, facilitates a parallel path to the iris plane, and it is faster.

Malpractice Litigation in Glaucoma.

PURPOSE: To analyze and report the causes and outcomes of malpractice litigation for patients with a diagnosis of glaucoma. DESIGN: Retrospective case series. PARTICIPANTS: Malpractice litigation cases. METHODS: The WestLaw database was reviewed for all malpractice litigation with ophthalmologist defendants in the United States between 1930 and 2014. All litigation involving glaucoma was included in this analysis and was compared with litigation in ophthalmology as a whole. MAIN OUTCOME MEASURES: The primary outcomes were the number of cases, jury award amounts, whether the case resolved in favor of the defendant, and the type of glaucomatous disease or procedure with the highest amount of litigation. RESULTS: Sixty-nine glaucoma malpractice cases were included. Overall, 62.3% of cases were resolved in favor of defendants. Twenty-nine cases were resolved via jury trial, 8 of which were associated with plaintiff verdicts with a mean adjusted jury award of $994 260. Ten cases resulted in settlements with mean adjusted indemnity of $1 210 414. Commonly litigated allegations included mismanagement of glaucoma (20.3%), failure to diagnose glaucoma (17.4%), failure to diagnose or mismanagement of angle-closure glaucoma (18.5%), adverse drug effects (14.5%), and trabeculectomy complications (8.7%). Overall, the median plaintiff award for all of glaucoma litigation was $977 476; the median award across all ophthalmic subspecialties was $568 302 (P = 0.25). For jury verdicts alone, the median award in glaucoma was $977 474, compared with $604 352 for all ophthalmology (P = 0.05). For settlements alone, the median indemnity payment in glaucoma was $955 988, compared with $827 051 for all ophthalmology (P = 0.24). CONCLUSIONS: Overall, the rate of plaintiff verdicts was similar in glaucoma and in ophthalmology as a whole; however, the magnitude of plaintiff awards was higher in glaucoma than in ophthalmology overall. Common scenarios leading to litigation included failure to diagnose or mismanagement of glaucomatous disease, as well as adverse drug effects and surgical complications. Many cases could have been avoided with careful examinations, thorough documentation in the patients' charts, and detailed conversations with patients.

Primary angle closure glaucoma is characterized by altered extracellular matrix homeostasis in the iris.

PURPOSE: To characterize the proteome of the iris in primary angle closure glaucoma (PACG). EXPERIMENTAL DESIGN: In this cross-sectional study, iris samples were obtained from surgical iridectomy of 48 adults with PACG and five normal controls. Peptides from iris were analysed using liquid chromatography-tandem mass spectrometry on an Orbitrap Q Exactive Plus mass spectrometer. Verification of proteins of interest was conducted using selected reaction monitoring on a triple quadrupole mass spectrometer. The main outcome was proteins with a log2 two-fold difference in expression in iris between PACG and controls. RESULTS: There were 3,446 non-redundant proteins identified in human iris, of which 416 proteins were upregulated and 251 proteins were downregulated in PACG compared with controls. Thirty-two upregulated proteins were either components of the extracellular matrix (ECM) (fibrillar collagens, EMILIN-2, fibrinogen, fibronectin, matrilin-2), matricellular proteins (thrombospondin-1), proteins involved in cell-matrix interactions (integrins, laminin, histidine-rich glycoprotein, paxillin), or protease inhibitors known to modulate ECM turnover (α-2 macroglobulin, tissue factor pathway inhibitor 2, papilin). Two giant proteins, titin and obscurin, were up- and down-regulated, respectively, in the iris in PACG compared with controls. CONCLUSIONS AND CLINICAL RELEVANCE: This proteomic study shows that ECM composition and homeostasis are altered in the iris in PACG.

Overhanging-Dissecting Blebs: Immunohistochemical Characterization.

PURPOSE: The purpose of this study was to determine if glaucoma filtering blebs migrate over or under the cornea epithelium using histopathologic and immunohistochemical techniques to evaluate the likely origin of the surface epithelium and bleb matrix. METHODS: Histologic and immunohistochemical evaluations were performed of normal conjunctiva (n=4), corneal overhanging-dissecting blebs (n=4), and leaking blebs over the scleral surface (n=6). Antibodies were used against epithelial [cytokeratin 3 (CK3)+12, CK13] and extracellular matrix [decorin and keratan sulfate (KS)] antigens. Labeling was graded in a semiquantitative manner. RESULT: The epithelium of dissecting (over cornea) blebs was labeled primarily with CK3+12 antibody. KS staining was faint and comparable in normal conjunctiva, and the stroma of dissecting and leaking blebs (P=0.12). Decorin staining in the normal conjunctival stroma was of moderate intensity and comparable with the dissecting bleb staining and; significantly greater than that in the leaking blebs (P=0.02). CONCLUSIONS: Histology and ICH indicate that the epithelium of the dissecting blebs has a corneal epithelial phenotype. The extracellular matrix immunophenotype was similar to the normal conjunctival stroma suggesting that dissecting blebs migrate under the corneal epithelium.