The possible antianginal effect of allopurinol in vasopressin-induced ischemic model in rats.

The anti-anginal effects of allopurinol were assessed in experimental model rats of angina and their effects were evaluated with amlodipine. In the vasopressin-induced angina model, oral administration of allopurinol in dose of 10 mg/kg revealed remarkably analogous effects in comparison with amlodipine such as dose-dependent suppression of vasopressin-triggered time, duration and severity of ST depression. In addition, allopurinol produced dose dependent suppression of plasma Malondialdehyde (MDA) level, systolic blood pressure, cardiac contractility and cardiac oxygen consumption; while in contrast, amlodipine minimally suppressed the elevation of plasma MDA level. Endothelial NO synthase (eNOS) expression, serum nitrate were strikingly increased, however lipid profile was significantly reduced. Seemingly, allopurinol was found to be more potent than amlodipine - a calcium channel antagonist. To conclude, it was explicitly observed and verified that on the ischemic electrocardiography (ECG) changes in angina pectoris model in rats, allopurinol exerts a significant protective effects, reminiscent of enhancement of vascular oxidative stress, function of endothelial cells, improved coronary blood flow in addition to the potential enhancement in myocardial stress. Moreover, our findings were in conformity with several human studies.

Scleral Buckle versus Pars Plana Vitrectomy in the Management of Primary Chronic Rhegmatogenous Retinal Detachment: A Comparison of Anatomical and Visual Outcomes.

PURPOSE: The purpose of this study is to compare the anatomical and visual outcomes of scleral buckle (SB) surgery with the pars plana vitrectomy (PPV) in the management of chronic rhegmatogenous retinal detachment. METHODS: This cohort study included patients who underwent surgical repair SB group and PPV group for chronic retinal detachment during 2014-2018 at the King Khalid Eye Specialist Hospital, Riyadh. The anatomical and functional success rate at 12 months after surgery was compared in two groups. Cox regression and linear regression analysis were performed to identify the predictor of anatomical and functional outcomes, respectively. Need for second surgery was also evaluated. RESULTS: Our cohort had 68 eyes in SB and 64 eyes in PPV group. Eyes that underwent PPV were more likely to develop retinal detachment over 12 months than those that underwent SB surgery (adjusted heart rates 2.11, 95% confidence interval [CI], 0.95-4.64 P = 0.065). A multivariable linear regression analysis did not reveal a significant association between the surgery type and change in visual acuity (beta coefficient, 0.002; 95% CI,-0.184, 0.189 for specific bread volume; P = 0.979). A higher percentage of eyes in the PPV group compared with those in the SB surgery group required secondary surgery (39.1% vs. 22.1%; P = 0.034). CONCLUSION: Scleral buckling surgery showed a better single surgery anatomic success rate as compared to PPV in the management of chronic primary rhegmatogenous retinal detachment. The functional outcome of the two procedures was comparable.

Episcleral brachytherapy for retinoblastoma.

BACKGROUND/AIMS: To report visual outcomes, survival outcomes and complications following episcleral brachytherapy (EB) for retinoblastoma. METHODS: Retrospective review of retinoblastoma cases treated with EB in a single institution. Survival outcomes were analysed using the Kaplan-Meier method. RESULTS: Eleven tumours of 11 eyes were treated with either iodine-125 or ruthenium-106 EB with a mean apical dose of 44 Gy. The tumours were classified as group B in 5 (46%), C in 3 (27%) or D in 3 (27%) eyes, respectively. Mean follow-up time was 75.4 months. EB served as primary treatment in 3 eyes (27%) and secondary treatment in 8 eyes (73%). Final visual acuity was better than 20/200 in 70% of cases. Globe preservation was achieved in 9 (82%) eyes. Local recurrence occurred in 18% of cases at a mean onset of 17.4 months after EB. Two group D tumours that recurred after secondary EB underwent enucleation. Mean onset of radiation retinopathy was 17.4 months following EB. No metastatic or fatal events were recorded. Kaplan-Meier analysis showed recurrence-free survival and ocular survival of 80% and overall survival of 100% at 5 years after EB. CONCLUSION: EB is an effective primary or secondary treatment modality for selected retinoblastoma eyes (groups B and C). Advanced group D tumours may represent a risk factor for local recurrence. Visually significant complications such as radiation retinopathy should be anticipated.

Clinical Characteristics and Treatment of 308 Panuveitis Patients over 10 Years: Results from the KKESH Uveitis Survey Study Group.

Purpose: To describe the clinical characteristics and surgical outcomes of panuveitis over a 10-year period.Methods: Data were collected on panuveitis etiology, treatment, surgery and change in vision.Results: Overall, 308 patients (594 eyes) were evaluated, 54.9% with non-granulomatous and 45.1% with granulomatous uveitis. Fifty-four patients had infectious and 254 had non-infectious uveitis. In infectious panuveitis, vision remained unchanged at last visit. The most frequent diagnosis was presumed intraocular tuberculosis (PIOTB) uveitis (48.1%). In the non-infectious subgroup vision increased significantly by 2 lines at last visit (p = 0.020). The most common diagnose was Vogt-Koyanagi-Harada (VKH) disease (38.6%). Initial therapy was oral prednisone in 86.6% with non-infectious etiology followed by immunosuppressive agents. Surgery secondary to complications (mainly cataracts) was performed in 46.7% patients.Conclusion: In Saudi Arabia, panuveitis was mainly due to VHK. PIOTB was the most common etiology for infectious panuveitis. Immunosuppressive therapy and surgery maintained BCVA in non-infectious panuveitis.

Goniosynechialysis for secondary angle closure glaucoma in aphakic patient after pars plana vitrectomy.

PURPOSE: To report the effectiveness of Goniosynechialysis (GSL) treating elevated intraocular pressure (IOP) in an aphakic eye with peripheral anterior synechiae (PAS) formation after vitrectomy. OBSERVATIONS: A 39-year-old gentleman with history of lamellar keratoplasty for corneal ectasia and blunt trauma to the right eye necessitating vitrectomy and lensectomy presented to our glaucoma unit with a secondary angle closure and an IOP of 50 mmHg. This was successfully treated with GSL and one year after surgery, the patient maintains a normal IOP without the use of medication. CONCLUSIONS AND IMPORTANCE: GSL may successfully restore angle integrity in aphakic patients following vitreoretinal surgery and avoid the need for a glaucoma drainage device.

Exploration of cotton leaf curl virus resistance genes and their screening in Gossypium arboreum by targeting resistance gene analogues.

Cotton leaf curl virus (CLCuV) disease is one of the major limiting factors in cotton production, particularly in widely cultivated Gossypium hirsutum varieties that are susceptible to attack by this virus. Several approaches have been employed to explore putative resistance genes in another cotton species, G. arboreum. However, the exact mechanisms conferring disease resistance in cotton are still unknown. In the current study, we used various approaches to identify possible resistance genes against CLCuV infection. We report the identification and isolation of a set of genes involved in the resistance response to viral infestation. PCR products containing genomic DNA gave multiple amplifications with a single primer in most reactions, and 38 fragments were cloned from G. arboreum and G. hirsutum. The sequences of cloned fragments belonged to various pathway genes and uncharacterized proteins. However, five amplified fragments (RM1, RM6, RM8, RM12 and RM31) showed similarity with R genes. Maximum homology (94 %) was observed with G. raimondii toll/interleukin receptor-like protein. BLAST search showed the homology of all resistance gene analogues (RGAs) with more than one chromosome, and multiple hits were observed on each chromosome for each RGA. Expression analysis through RT-PCR identified variable expression levels of the different RGAs in all tested genotypes. The expression level of RGAs differed between symptomatic and asymptomatic plants, with the exception of RGA 395, whose expression level was the same in both diseased and healthy plants. Knowledge of the interaction of these genes with various cotton pathogens could be utilized to improve the resistance of susceptible G. hirsutum and other plant species.

Humic Substances: Determining Potential Molecular Regulatory Processes in Plants.

Humic substances (HSs) have considerable effects on soil fertility and crop productivity owing to their unique physiochemical and biochemical properties, and play a vital role in establishing biotic and abiotic interactions within the plant rhizosphere. A comprehensive understanding of the mode of action and tissue distribution of HS is, however, required, as this knowledge could be useful for devising advanced rhizospheric management practices. These substances trigger various molecular processes in plant cells, and can strengthen the plant's tolerance to various kinds of abiotic stresses. HS manifest their effects in cells through genetic, post-transcriptional, and post-translational modifications of signaling entities that trigger different molecular, biochemical, and physiological processes. Understanding of such fundamental mechanisms will provide a better perspective for defining the cues and signaling crosstalk of HS that mediate various metabolic and hormonal networks operating in plant systems. Various regulatory activities and distribution strategies of HS have been discussed in this review.

Episcleral brachytherapy of uveal melanoma: role of intraoperative echographic confirmation.

PURPOSE: To compare the rates of tumour recurrence following episcleral brachytherapy for uveal melanoma before and after implementation of intraoperative echographic confirmation of plaque placement. MATERIALS AND METHODS: All patients with primary single ciliary body or choroidal melanoma treated with iodine-125 or ruthenium-106 plaque brachytherapy between 1 January 2004 and 30 December 2013 were included. Exclusion criteria were patients with previous radiation treatment and patients who received adjuvant transpupillary thermotherapy. Since February 2007, intraoperative echographic confirmation was initiated to ensure that the plaque was centred on the tumour base and/or all tumour margins were covered by the plaque. RESULTS: 252 patients were included in the study. Local tumour control after primary brachytherapy was achieved in 242/252 (96.0%). Of the 10 patients with treatment failure, 8 patients had local recurrence and 2 patients had failure to response. With the incorporation of the intraoperative echographic confirmation for plaque positioning the treatment failure rate decreased from 9.3% (5/54 patients) to 1.5% (3/198 patients). Continuous and categorical univariable predictors of recurrence were analysed for statistical significance. The only statistically significant variable was the intraoperative echographic confirmation (HR: 0.16; p=0.032) for recurrence within the first 24 months. CONCLUSIONS: Intraoperative echographic confirmation of plaque placement during episcleral brachytherapy for choroidal melanoma reduces the risk of early local recurrence.

Extranodal Marginal Zone Lymphoma of Ocular Adnexa: Outcomes following Radiation Therapy.

AIM: The aim of this study was to report outcomes following radiation therapy in patients with biopsy-proven extranodal marginal zone lymphoma of the ocular adnexa and uvea. METHODS: Records from a single institution were retrospectively reviewed from January 1997 to December 2015. The mean follow-up duration was 38 months (range 0-194). Radiation therapy was administered to 77 eyes (60 patients); 57 of the 77 eyes (74%) were treated with radiation only (range 20-36 Gy, median 15 fractions). Radiation cataract, radiation retinopathy, and optic neuropathy assessments were performed on all eyes treated with radiation. RESULTS: 100% of the 47 patients treated with radiation therapy only had local control with an average dose of 26.5 Gy (median 25.2 [range 20-36] Gy; 150-200 cGy per fraction). Four patients lost 2 lines or more of vision after radiation. The most common complication of radiation therapy was cataract formation/progression in 19 eyes (25%). Radiation retinopathy was observed only in 1 patient (1%). CONCLUSION: Our results confirm that radiation therapy (median 25 Gy) for extranodal marginal zone lymphoma of the ocular adnexa is associated with high local control and low risk of visually significant complications.

Atypical Presentation of Ocular Toxoplasmosis: A Case Report of Exudative Retinal Detachment and Choroidal Ischemia.

A 24-year-old healthy male presented with a chief complaint of blurred vision in the right eye for 1-week. Fundus examination indicated right exudative retinal detachment and choroidal ischemia. The patient responded well to anti-toxoplasmosis medications and steroids. Exudative retinal detachment and choroidal ischemia are atypical presentations of ocular toxoplasmosis. However, both conditions responded well to anti.parasitic therapy with steroid.

The outcomes and prognostic factors of vitrectomy in chronic diabetic traction macular detachment.

PURPOSE: To investigate the outcomes of pars plana vitrectomy (PPV) for chronic diabetic traction macular detachment (CTMD). METHODS: Ninety-six eyes that underwent PPV for CTMD of at least 6 months duration were retrospectively analyzed. Retinal reattachment rate, final vision, and prognostic factors for poor visual outcome were the main outcome measures. RESULTS: All eyes had long-standing TMD (median 12, range: 6-70 months). The median postoperative follow-up was 15 (range: 3-65) months. Eighty-seven eyes (90.6%) had their retina and macula reattached after one PPV. At final examination, 84 eyes (87.5%) had stable vision or at least one line improvement, and three had no light perception. Seventeen (17.7%) and 41 (43%) eyes had preoperative visual acuity of ≥20/200 and ≥5/200 as compared to 40 (41.6%; P=0.0005) and 64 (66.7%; P=0.0014) eyes at final follow-up, respectively. Age >50 years (Odds ratio [OR] =5.84, 95% confidence interval [CI] =1.53-22.19, P=0.01), preoperative vision <20/400 (OR =7.012, 95% CI =1.82-26.93, P=0.005), and ischemic macula (OR =14.13, 95% CI =3.61-55.33, P<0.001) were significantly associated with final vision <20/400. CONCLUSION: PPV for CTMD may be beneficial particularly in patients who are relatively younger and have good baseline vision and no macular ischemia.

Uveitis in Behçet disease in a tertiary center over 25 years: the KKESH Uveitis Survey Study Group.

PURPOSE: To describe the features of Behçet-associated uveitis over a 25-year period. DESIGN: Retrospective observational case series. METHODS: A chart review of patients with Behçet-associated uveitis who were evaluated from January 1986 to December 2011 at King Khaled Eye Specialist Hospital, Saudi Arabia. Demographic data, symptoms, type of uveitis, treatment, and complications were evaluated. The main outcome measures were presenting symptoms, types of uveitis, treatment, and complications. RESULTS: There were 132 patients (232 eyes; 102 male [77.3%]) evaluated with age of onset of 36.9 ± 11.4 years. Panuveitis was the most common presentation, affecting 118 patients (89.4%). Episodes were bilateral in 100 patients (75.8%). Baseline best-corrected visual acuity (BCVA) was 20/125 in both eyes. Retinal vasculitis at presentation occurred in 61 eyes (26.3%), occlusive vasculitis in 59 eyes (25.4%), and macular edema in 42 eyes (18.1%). Common therapeutic management included oral corticosteroids in 123 patients (93.2%), intravenous steroid therapy in 35 patients (26.5%), cyclosporine in 98 patients (74.2%), and azathioprine in 65 patients (49.2%). Common anterior segment complications included glaucoma (44 eyes, 19%) and cataracts (34 eyes, 14.7%). The most common posterior segment complication was optic nerve atrophy. Cataract surgery was the most common surgery. At last visit, BCVA was better than 20/50 in 131 eyes (56.5%). CONCLUSIONS: Behçet-associated uveitis predominantly affects young men in Saudi Arabia. Bilateral panuveitis associated with retinal vasculitis was the most common manifestation. More than 50% of patients maintained 20/50 or better BCVA at final follow-up and were primarily managed with oral corticosteroids and other immunosuppressive agents.