Metabolic Syndrome Is Associated With Ocular Hypertension and Glaucoma
Roddy, Gavin W.
Glaucoma remains the world’s leading cause of irreversible blindness and though intraocular pressure (IOP) is the most prevalent risk factor and only reliable therapeutic target, a number of systemic disease associations have been reported. Metabolic syndrome (MetS) is a constellation of findings that includes systemic hypertension, abdominal obesity, glucose intolerance, and dyslipidemia. MetS is becoming increasingly common worldwide, with prevalence up to 40% in some countries. Not only is MetS a significant cause of morbidity, but it is also associated with an increase in all-cause mortality. Reports have been conflicting regarding the association of individual components of MetS, including systemic hypertension and diabetes, with elevated IOP or glaucoma. However, though limitations in the existing literature are present, current evidence suggests that MetS is associated with IOP as well as glaucoma. Additional studies are needed to clarify this association by incorporating additional metrics including assessment of central corneal thickness as well as optic nerve structure and function. Future studies are also needed to determine whether lifestyle modification or systemic treatment of MetS could reduce the incidence or progression of glaucoma.
Management of Anticoagulation and Antiplatelet Therapy in Glaucoma Surgery
Shukla, Aakriti G.; Ramulu, Pradeep Y.
The use of antithrombotic therapy is rising as the population of older adults grows and novel agents with wider indications emerge. Likewise, surgical treatment of glaucoma may become increasingly common as the prevalence of glaucoma increases and innovative treatment options are developed. These trends highlight the need to understand how best to manage antithrombotic therapy in the context of glaucoma surgery. This review article describes current literature on antithrombotic therapy and perioperative thromboembolic risk evaluation based on individual factors. In addition, guidance is offered on the management of antithrombotic therapy in the setting of each type of glaucoma surgery, with an emphasis on a multidisciplinary approach involving the patients’ treating physicians.
Effects of Acute Atmospheric Pressure Changes on Dynamic Contour Tonometry and Goldmann Applanation Tonometry in Normal Individuals: A Pilot Study
Albis-Donado, Oscar; Rodríguez-Camacho, Brenda; Bhartiya, Shibal; More
Purpose:
To compare IOP measurements obtained with GAT and DCT in 22 normal individuals at different atmospheric pressures simulated in a hyperbaric chamber.
Methods:
The IOP of both eyes of 22 healthy volunteers was measured using GAT and DCT at 4 different atmospheric pressure levels.
Starting at 1 Queretaro atmospheric pressure (QATM), the IOP was measured with GAT and DCT. The atmospheric pressure was then increased to 1.1 QATM (equivalent to 1032 m above sea level), 1.2 QATM (equivalent to 315 m above sea level), and 1.25 QATM (equivalent to sea level), starting 5 minutes after reaching each level. The limits of agreement between various measurements with each tonometer were calculated using the Bland-Altman plots.
Results:
The first 4 subjects were used to measure feasibility, consistency, variability, and the time needed for IOP to return to baseline after each atmospheric pressure increase.
For the entire 44 eyes, the mean GAT IOP at 1 QATM was 12.23 mm Hg (range, 8 to 20 mm Hg; SD, 2.84) and mean DCT was 16.36 (range, 12.1 to 25.3; SD, 2.84), with a mean 4.14 mm Hg difference (range, −0.1 to 7.5 mm Hg; SD, 1.62; P<0.001).
Using the second measurements of the first 4 subjects and those after 5 minutes of adaptation for the rest of the group at 1.1 QATM, mean GAT IOP was 11.05±2.68 mm Hg and mean DCT IOP was 15.60±3.02 mm Hg, for a mean difference between instruments of 4.56±1.81 mm Hg (P<0.001).
At 1.2 QATM, mean GAT IOP was 11.14±2.53 mm Hg and mean DCT IOP was 15.39±2.91 mm Hg. The difference between instruments was 4.25±2.12 mm Hg (P<0.001).
At 1.25 QATM, the mean GAT IOP was 12.39±3.11 mm Hg and mean DCT IOP was 14.91±2.73 mm Hg. The difference between instruments after 5 minutes of adaptation was 2.53±1.62 mm Hg (P<0.001).
Generalized estimating equations for performing linear regression multivariable analysis using atmospheric pressure, expressed as altitude, and age as covariates, shows that the difference between GAT and DCT increases by 1 mm Hg per 673 m of increase of altitude above sea level. Age was not a significant predictor.
Conclusions:
Acute changes in atmospheric pressure induce changes in IOP measurements for both GAT and DCT and in different directions. Despite the limitation of sample size, it may be postulated that the difference of IOP measurements between the 2 tonometers increases with lower atmospheric pressures.
Long-term Outcomes of Glaucoma Drainage Implants in Uveitic Eyes With Fluocinolone Acetonide Implants
Cao, Jessica L.; Srivastava, Sunil K.; Lowder, Careen Y.; More
Purpose:
The purpose of this study was to evaluate the long-term control of IOP achieved by GDIs in uveitic eyes with glaucoma and a FA implant.
Patients and Methods:
Retrospective case series of 56 eyes from 37 patients with a history of noninfectious posterior uveitis who underwent both FA implantation and GDI surgery at the Cleveland Clinic Cole Eye Institute between April 2001 and April 2017. Patients were excluded if they did not undergo FA implantation before, or concurrently with, a GDI. Data was collected up to 10 years after GDI surgery. Outcome measures included IOP, number of IOP-lowering medications, and surgical success rate at each timepoint. Success was defined as IOP between 6 and 21 mm Hg at the most recent follow-up visit, without need for GDI removal or additional IOP-lowering surgeries, or loss of light perception.
Results:
The mean follow-up time was 71.0 months (median 72.0 mo). IOP was reduced by a mean of 52.9% (range: 43.1% to 62.3%) and the number of IOP-lowering medications decreased by a mean of 69.0% (range: 56.3% to 93.8%) between 1 and 10 years postoperatively. The percentage of eyes with IOP <21 mm Hg was 32.1% at baseline and ranged between 76.8% and 100% at follow-up. The percentage of eyes with IOP <18 mm Hg was 21.4% at baseline and ranged between 67.9% and 100% at follow-up. The surgical success rate was 71.4% at 10 years.
Conclusions:
In eyes with uveitis that undergo FA implantation, concurrent or subsequent GDI surgery offers excellent long-term control of IOP. Postoperative IOP and number of IOP-lowering medications dropped considerably and remained stable.
Persistent Hypotony and Annular Ciliochoroidal Detachment After Microhook Ab Interno Trabeculotomy
Ishida, Akiko; Mochiji, Mihoko; Manabe, Kaoru; More
Aims:
To report persistent hypotony after μLOT, a minimally invasive glaucoma surgery (MIGS).
Subjects and Methods:
This observational case series included 4 consecutive cases (3 men, 1 woman; mean age, 48.8±15.1 y) of persistent hypotony that developed after μLOT between May 2015 and March 2018. The patients’ data and surgical results were obtained from the medical charts.
Results:
All patients had open-angle glaucoma (2 juvenile, 1 primary, and 1 pigmentary) and were myopic (axial lengths, >24 mm). Two patients had undergone previous refractive surgery. μLOT alone was performed in 2 cases and combined with cataract surgery in 2 cases. In all cases, hypotony below 5 mm Hg was recorded 1 day postoperatively and sustained. In all cases, ultrasound biomicroscopy showed an annular CCD; communication between the anterior chamber and suprachoroidal space was detected in 3 of 4 cases. The hypotony resolved in 3 of the 4 cases from 2 to 8 months postoperatively, that is, spontaneously in 2 cases (cases 1 and 4) and after sulfur hexafluoride gas injection into the anterior chamber in 1 case (case 2). CCD resolution accompanied remarkedly high intraocular pressure, which required filtration surgeries. The incidence of persistent hypotony was 0.7% (4/547 eyes).
Conclusions:
After MIGS, persistent hypotony because of CCD rarely occurs. Increased uveoscleral outflow because of LOT or creation of a cyclodialysis cleft by traction of the pectinate ligament can be a mechanism of CCD development. Young age and myopia can be risks for cyclodialysis cleft formation and hypotony maculopathy after MIGS.