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Cem Evereklioglu

Publications and source records attributed to Cem Evereklioglu.

At least 37 records · Page 2Linked to original sources

Managing the symptoms of Behçet's disease.

Behçet's disease (BD) is a chronic, relapsing, systemic inflammatory vasculitis of unknown aetiology with a myriad of immunological and pathological consequences. Patients with BD are clustered along the ancient silk road, extending from Far-East Asia to Turkey. The disease affects both genders of all ages from infants to the elderly. It is a long-term, cyclical disease and such patients may have symptom-free periods of weeks, months or years that are interrupted by exacerbations of varying intensities lasting a few days, weeks or months. Clinical features include oral aphthae, genital ulcers, ocular inflammation, skin lesions, as well as articular, vascular, neurological, pulmonary, gastrointestinal, renal and genitourinary manifestations. The main histopathological finding is a widespread vasculitis of the arteries and veins of any size or thrombophilia according to the site of involvement. BD may start with just one or two small symptoms but other symptoms may gradually appear over the years. Recurrent ocular inflammation, which occurs in approximately 50% of cases, is the major morbidity that may eventually lead to blindness. The treatment of BD is usually symptomatic and palliative. Therefore, the main objectives are to relieve symptoms associated with mucocutaneous lesions and arthritis, to modify the course of the disease, to control inflammatory eye disease, clinically suppress the inflammation and vasculitis, to prevent recurrences and thus, prevent irreversible damage. The choice of treatment is based on the severity of systemic involvement, clinical presentation and the site affected. The preferred treatment modalities are combined drug therapy and include topical therapies as well as systemic corticosteroids, NSAIDs, colchicine, dapsone and immunosuppressive and cytotoxic agents. Such therapies are tailored to the individual patient depending on clinical manifestations. Thalidomide, tacrolimus, IFN-alpha and anti-TNF monoclonal antibody have recently attracted attention as novel therapeutic approaches.

Behcet Syndrome↗

Tc-99m HMPAO brain SPECT in linear nevus sebaceous syndrome.

The authors present a case of linear nevus sebaceous syndrome (LNSS) with atrophy of bilateral frontotemporal areas of the brain, left cerebellum and hippocampus, and bilateral uncal dysplasia demonstrated by magnetic resonance imaging (MRI). Magnetic resonance angiography revealed bilateral internal carotid artery hypoplasia with absence of flow in the anterior and middle cerebral arteries. Tc-99m HMPAO brain SPECT demonstrated more areas of perfusion defects while MRI detected volume loss and gliosis in affected areas. Tc-99m HMPAO brain SPECT may be more useful for revealing absent or decreased perfusion areas of brain lesions than MRI in LNSS.

Brain↗

Comparison of secondary implantation of flexible open-loop anterior chamber and scleral-fixated posterior chamber intraocular lenses.

PURPOSE: To analyze and compare the outcomes and complication rates of secondary implantation of flexible, open-loop, anterior chamber intraocular lenses (AC IOLs) and single-piece, scleral-fixated, posterior chamber IOLs (PC IOLs). SETTING: Departments of Ophthalmology, Gaziantep University Medical Faculty, Research Hospital, Gaziantep, and Inönü University Medical Faculty, Research Hospital, Malatya, Turkey. METHODS: This study comprised 124 eyes of 113 aphakic patients (61 men, 52 women) with insufficient capsule support who had secondary IOL implantation from January 1997 to June 2001. In Group 1 (n = 73 eyes), a flexible, open-loop AC IOL was implanted and in Group 2 (n = 51 eyes), a single-piece, scleral-fixated PC IOL. The mean follow-up was 34 months (range 6 to 53 months) and took place at several different clinical settings. The mean interval between the initial cataract operation and secondary IOL implantation was 63 months (range 6 months to 12 years). The postoperative outcomes, safety, efficacy, and complication rates were analyzed, and the preoperative and postoperative best spectacle-corrected visual acuities (BSCVAs) were compared. RESULTS: The postoperative mean BSCVA was 20/34.8 +/- 45.2 (SD) in Group 1 and 20/32.1 +/- 33.7 in Group 2; the difference was not significant (P =.718). A BSCVA of 20/40 or better was achieved in 62 eyes (84.9%) in Group 1 and 45 eyes (88.2%) in Group 2. A BSCVA of 20/25 or better was achieved in 40 eyes (54.8%) and 33 eyes (64.7%), respectively. The difference between the 2 groups was not significant (P =.472). Complications occurred in 25 eyes (34.2%) in Group 1 and 13 eyes (25.5%) in Group 2 (P >.05). The most frequent complications in Group 1 were early transient corneal edema, intraocular pressure elevation, cystoid macular edema, hyphema, secondary glaucoma, and iris capture or pupil decentration and in Group 2, suture erosion, a tilted or decentered IOL, fibrin reaction, and vitreous prolapse into the anterior chamber. CONCLUSIONS: The AC IOLs and PC IOLs were safe and effective for secondary implantation to correct aphakia. Secondary implantation of the scleral-fixated PC IOL seemed to provide a more favorable outcome and a lower complication rate than the open-loop AC IOL in complicated cataract cases with inadequate capsule and zonular support. As scleral-fixated PC IOL implantation is technically more difficult than AC IOL implantation, the decisive factor in choosing a secondary IOL is surgical experience. Long-term comparison of both techniques is required.

Adult↗

Nitric oxide and lipid peroxidation are increased and associated with decreased antioxidant enzyme activities in patients with age-related macular degeneration.

BACKGROUND: Nitric oxide (NO), hydroxyl radical (OH*), superoxide anion (O2-) and hydrogen peroxide (H2O2) are free-radicals released in oxidative stress. Superoxide dismutase (SOD), glutathione peroxidase (GSHPx) and catalase (CAT) are antioxidant enzymes, mediating defense against oxidative stress. Excess NO and/or defective antioxidants cause lipid peroxidation, cellular dysfunction and death. Age-related maculopathy (ARM) or degeneration (ARMD) is the leading cause of irreversible blindness in developed countries. The etiology is unclear and the molecular factors contributing this disease remain to be specified. AIMS: This multicenter, double-blind, cross-sectional study aimed to investigate plasma NO and lipid peroxidation levels with relation to antioxidant enzyme activities in erythrocyte and plasma of patients with ARMD compared with healthy control subjects. METHODS: NO, lipid peroxidation (measured as plasma malondialdehyde [MDA] levels) and the catalytic activity of SOD, GSHPx and CAT were measured in a group of 41 patients with maculopathy (19 men, 22 women; 67.12 +/- 3.70 years) and compared with 25 age- and sex-matched healthy control subjects without maculopathy (12 men, 13 women; 68.04 +/- 3.02 years). NO and MDA levels were measured in plasma, CAT in red blood cells (RBCs), and SOD and GSHPx in both plasma and RBCs. Color fundus photographs were used to assess the presence of maculopathy, and the patients were divided into two groups using clinical examination and grading of photographs; early-ARM (n = 22) and late-ARMD (n = 19). RESULTS: All patients with maculopathy had significantly (p < 0.001) higher plasma NO levels over control subjects (mean +/- SD, 48.58 +/- 8.81 vs. 28.22 +/- 3.39 micromol/l). Plasma MDA levels in patients and control subjects were 4.99 +/- 1.00 and 2.16 +/- 0.24 micromol/l, respectively, and the difference was significant (p < 0.001). On the other hand, SOD and GSHPx activities were significantly lower in both RBCs and plasma of patients with maculopathy than in control subjects (RBCs-SOD, 3509.30 +/- 478.22 vs. 5033.30 +/- 363.98 U/g Hb, p < 0.001; plasma-SOD, 560.95 +/- 52.52 vs. 704.76 +/- 24.59 U/g protein, p < 0.001; RBCs-GSHPx, 663.43 +/- 41.74 vs. 748.80 +/- 25.50 U/g Hb, p < 0.001; plasma-GSHPx, 98.26 +/- 15.67 vs. 131.80 +/- 8.73 U/g protein, p < 0.001). RBCs-CAT levels were not different between groups (131.68 +/- 12.89 vs. 133.00 +/- 13.29 k/g Hb, p = 0.811). Late-ARMD patients had significantly lower antioxidant enzyme levels and higher MDA levels when compared with early-ARM patients (for each, p < 0.001). In addition, plasma NO and MDA levels were negatively correlated with SOD and GSHPx activities. CONCLUSIONS: This study demonstrated for the first time that NO, the most abundant free-radical in the body, might be implicated in the pathophysiology of ARMD in association with decreased antioxidant enzymes and increased lipid peroxidation status.

Aged↗

Urinary nitric oxide levels are increased and correlated with plasma concentrations in patients with Behçet's disease: is it a new urinary activity marker?

Nitric oxide (NO) is a free radical and serves many functions within the kidney. Excess NO causes glomerular injury. Behçet's disease (BD) is a systemic immunoinflammatory vasculitis, affecting every organ in the body including the kidneys (subclinic glomerulonephritis). We investigated the role of urinary total nitrite levels (end product of NO) in BD and evaluated whether urinary concentrations were correlated with its plasma levels or disease activity. Thirty-six consecutive Behçet's patients (19 men, 17 women; 35.9 years), and 20 age- and sex-matched healthy control volunteers (12 men, eight women; 33.2 years) were divided into an active (n = 16) and inactive (n = 20) period. Urinary and serum NO levels ( micromol/mg urinary creatinine) were higher in BD patients (4.1 +/- 0.3) than control subjects (1.7 +/- 0.2; P < 0.001). Serum NO levels in Behçet's patients and control subjects were 51.3 +/- 9.8 and 21.7 +/- 7.3 micromol/L, respectively (P < 0.001). Active patients had higher urinary NO excretion (4.9 +/- 0.3) than inactive patients (3.3 +/- 0.3; P < 0.01). Urinary NO levels were correlated with its serum levels (r2 = 0.69, P < 0.001). Higher urinary NO levels found in BD may be produced by the kidney as a result of an inflammatory stimulation. As excess NO is toxic to the tissues, increased NO levels may play a role in mediating subclinic glomerular injury of such patients. However, we could not determine the exact site(s) of NO synthesis by the kidney, such as the glomeruli, blood vessels and/or the tubular cells. Whatever the source, urinary NO levels may be used as a new activity marker in the diagnosis and follow up of BD by serial measurements.

Adult↗

Effect of gestational nicotine treatment on newborn rat retina: a histopathological and morphometric analysis.

BACKGROUND: Smoking is a significant risk factor in several debilitating and fatal diseases. It has been implicated in bilateral tobacco-toxic and Leber's hereditary optic neuropathies. Although it has been demonstrated that smoking has a cumulative effect on retinal and optic nerve functions and causes diffuse and localised retinal sensitivity decrease in healthy chronic heavy smokers, the affected retinal layer has not been identified and there is no experimental study investigating the effect of nicotine exposure during gestation on the newborn rat retina. PURPOSE: This experimental investigation evaluated histologically the influence in vivo of maternal nicotine treatment during pregnancy on the newborn rat retina. Different dosages of the test compound simulated the range of low, moderate, and heavy smokers in humans. METHODS: Experimentally naive, adult female Wistar-albino rats weighing 200-250 g were mated with adult male rats over 2 days for copulation in the proportion of two females for every male animal. After confirming pregnancy with vaginal smear method, 40 gravid rats (dams) were then randomly assigned into four equal groups (three experimental and one control; n = 10 in each). On day 9 of gestation, groups 1, 2, and 3 experimental dams were treated with intraperitoneal (i.p.) (-)-nicotine tartrate at doses of 0.5, 1, and 2 mg kg body weight-1 day-1, respectively during pregnancy from gestational day 9-21. Group 4 control dams were given i.p. saline solution daily for the same period. After normal delivery, the newborn litters were sacrificed at postnatal day 1 or day 30. The eyes were enucleated for histopathologic and morphometric analysis of the retinas. Nicotine-induced neuronal changes were measured by morphometric analyses on cell counts of ganglion cell layer (linear cell density in number per unit length of retina) and thickness of the various retinal layers. RESULTS: The litters in control group 4, and experimental groups 1 and 2 had normal retinal findings. On the other hand, morphometric analysis of retinal sections in experimental group 3 eyes demonstrated a 20.7% decrease in the number of surviving ganglion cells (40.7 +/- 2.0) compared with controls (51.3 +/- 1.1; p < 0.001). The thickness of whole retina (126.6 +/- 5.4 microm) was also reduced by 13.5% compared with controls (146.3 +/- 4.5 microm; p = 0.007). The main site of retinal atrophy was the inner plexiform layer (30.1 +/- 1.6 microm vs 43.5 +/- 1.3 microm; p < 0.001) with almost no change in the other retinal layers. CONCLUSIONS: Gestational nicotine treatment induces marked changes in the organisation of the developing retina in newborn rats histopathologically. Quantitative morphometric analysis clearly demonstrated that the two most affected structures were the retinal ganglion cells and the inner plexiform layer, both of which are supplied by central retinal artery.

Animals↗

Adenosine deaminase enzyme activity is increased and negatively correlates with catalase, superoxide dismutase and glutathione peroxidase in patients with Behçet's disease: original contributions/clinical and laboratory investigations.

AIM: Behçet's disease (BD) is an inflammatory vasculitis with immunologic, endothelial and neutrophil alterations. Adenosine deaminase (AD) is a marker of T-cell activation and is related to the production of reactive oxygen species by neutrophils with the production of NO(*), O(2)(*-), H(2)O(2) and OH(*). We reported increased tumour necrosis factor-alpha, soluble interleukin-2 receptor, interleukin-6, interleukin-8 and NO(*) in active BD. As there is a relation between cytokines, T cells and oxidative stress in inflammatory diseases, this study further evaluated: (1) plasma AD activity and its correlation with acute phase reactants; (2) thiobarbituric acid-reactive substances (TBARS) as an indicator for lipid peroxidation; and (3) antioxidant enzymes superoxide dismutase (SOD), glutathione peroxidase (GSHPx) and catalase in patients with BD. The effect of disease activity and correlations between the measured parameters were explored. METHODS: A total of 35 active (n=17) or inactive (n=18) patients with BD (16 men, 19 women) satisfying International Study Group criteria, and 20 age-matched and sex-matched controls (nine men, 11 women) were included in this cross-sectional case-control study. AD and TBARS were measured in plasma, catalase in red blood cells (RBC), and SOD and GSHPx in both plasma and RBC in both groups. Acute phase reactants (alpha(1)-antitrypsin, alpha(2)-macroglobulin, neutrophils, erythrocyte sedimentation rate) were used to classify patients as active or inactive. RESULTS: Plasma AD (mean+/-standard error of the mean, 36.1+/-0.7 U/l) and TBARS (4.2+/-0.1 nmol/ml) levels were significantly (for each, p<0.001) higher in BD than in controls (24.1+/-0.8 U/l and 1.6+/-0.1 nmol/ml, respectively). RBC catalase activity was significantly (p<0.001) lower in BD than in controls (120.9+/-3.8 versus 160.3+/-4.1 k/g haemoglobin). SOD and GSHPx activities were significantly lower in both plasma and erythrocytes of patients with BD than in controls (plasma SOD, 442.4+/-8.6 versus 636.4+/-9.2 U/ml, p<0.001; RBC SOD, 3719.2+/-66.0 versus 4849.7+/-49.0 U/g haemoglobin, p<0.001; plasma GSHPx, 73.1+/-1.5 versus 90.6+/-2.9 U/ml, p<0.001; RBC GSHPx, 600.7+/-8.0 versus 670.6+/-10.1 U/g haemoglobin, p<0.001). Active BD patients had significantly lower antioxidant enzymes (except RBC catalase) and higher AD and TBARS levels than inactive subjects (for each, p<0.01). When considering all BD patients, a significant positive correlation was present between AD and TBARS (p<0.001) whereas both AD and TBARS were negatively correlated with antioxidant enzymes (for each, p<0.05). CONCLUSIONS: AD and lipid peroxidation are increased and associated with defective antioxidants in BD, suggesting interactions between activated T cells and neutrophil hyperfunction. Measures of pro-oxidative stress and antioxidative defence with AD activity as an indicator of T-cell activation can be considered as significant supportive diagnostic indicators, especially in active disease. In addition, strengthening the antioxidant defence may contribute to treatment modalities.

Acute-Phase Proteins↗

Hammer-chisel technique in endoscopic dacryocystorhinostomy.

We performed a prospective evaluation of endoscopic hammer-chisel dacryocystorhinostomy (DCR) procedures on 62 eyes of 44 patients (40 female and 4 male) with chronic epiphora or dacryocystitis (26 unilateral and 18 bilateral). The technique included chisel removal of bone over the lacrimal sac. The follow-up period was 12 to 54 months (mean, 28 months), and the patients' ages ranged from 17 to 67 years (mean, 35.5 years). The success rate of the consecutive endoscopic hammer-chisel DCR procedures was 87%. During operation, 8 patients had mild mucosal hemorrhage, which did not prevent the successful completion of the operation. Excellent patient tolerance was observed, with minimal morbidity and no major complications. As compared to the external approach, endoscopic hammer-chisel DCR is less traumatic, is less time-consuming, and is practical and cosmetically convenient, with minimal perioperative and postoperative complications. It also allows the simultaneous correction of any intranasal disease. It requires minimal instrumentation and is a relatively easy and fast technique.

Adolescent↗

High dose of caffeine administered to pregnant rats causes histopathological changes in the cornea of newborn pups.

BACKGROUND: Caffeine is frequently used during pregnancy and associated with teratogenic effects, such as low birth weight, hearth and digital defects, cleft palate and abortion with fetal loss. This study investigated histopathologically the effects of caffeine on neonatal rat cornea. MATERIAL/METHODS: Fifty pregnant Wistar-Albino rats (dams) were randomly divided into five groups, one control and four experimental. Between day 9 and 21 of gestation, group 1 dams (control, n=10) were exposed to intraperitoneal (i.p.) SF daily until delivery. Group 2 (n=10), group 3 (n=10) and group 4 (n=10) dams were treated with i.p. caffeine at doses of 25, 50 and 100 mg/kg/d, respectively, for the same period. Group 5 dams were given caffeine in distilled water in a gavage at a dose of 50 mg/kg/d during the same period. After normal delivery, the litters were killed at postnatal day 1 or 30 and the eyes were enucleated for corneal histopathologic investigation. RESULTS: Control and group 1 eyes had normal corneal epithelium, regular stromal fibers, descement membrane and monolayer inner corneal endothelium. The remaining experimental litters demonstrated changes, such as vacuolated endothelial cells with proliferation, hyperchromasia, polymorphism, endothelial cell agenesis, increased stromal mitotic activity and focal increase in corneal thickness with widely separated corneal lamellae in the injured area. These changes occurred most often in the litters treated with high doses of caffeine. CONCLUSIONS: Excessive gestational caffeine intake has been shown histopathologically to have some teratogenic effects on newborn rat cornea.

Animals↗

Use of caffeic acid phenethyl ester to prevent sodium-selenite-induced cataract in rat eyes.

PURPOSE: To investigate whether caffeic acid phenethyl ester (CAPE) prevents sodium-selenite-induced cataract. SETTING: Department of Ophthalmology and Biochemistry, Inonu University Medical Faculty, Turgut Ozal Medical Center, Research Hospital, Malatya, Turkey. METHODS: Sixty Sprague-Dawley rat litters were randomized into 3 groups. In Group 1 (n = 18), sodium selenite (30 nmol/g body weight) was injected subcutaneously on postpartum day 10. In Group 2 (n = 22), subcutaneous CAPE (15 micromol/kg) and sodium selenite (30 nmol/g body weight) were injected on postpartum day 10. The CAPE dose was continued subcutaneously for 3 days after the initial injection. Only subcutaneous saline was injected in Group 3 (control, n = 20). The development of cataract was assessed weekly, and its density was graded by slitlamp biomicroscopy and photography. Removed rat lenses were analyzed for glutathione (GSH) and malondialdehyde (MDA, marker of lipid peroxidation). RESULTS: Group 2 rats had clear lenses or minor cataract. All Group 1 rats developed more severe cataract or complete opacification. The between-group difference was statistically significant (P <.05). All control lenses (Group 3) were clear. The mean GSH level in Group 1 (4.49 micromol/g wet weight +/- 0.93 [SD]) was significantly lower than that in Group 2 (8.63 +/- 0.88 micromol/g wet weight) (P <.05) and controls (10.76 +/- 1.97 micromol/g wet weight) (P <.05). The mean MDA level in Group 1 (8.54 +/- 1.31 nmol/g wet weight) was significantly higher than that in Group 2 (5.23 +/- 0.84 nmol/g wet weight) (P <.05) and controls (4.19 +/- 0.81 nmol/g wet weight) (P <.05). CONCLUSIONS: Caffeic acid phenethyl ester effectively suppressed cataract formation in rats. The protective effect was supported by lower GSH and higher MDA levels in Group 1 than in Group 2, suggesting the antioxidant efficacy of this agent. Since CAPE has no known harmful effect on normal cells, it may be beneficial in clinical use in humans.

Animals↗

Lenticular astigmatism in tilted disc syndrome.

PURPOSE: To evaluate whether an abnormal optic disc shape in patients with tilted disc syndrome (TDS) is associated with an abnormal configuration of the crystalline lens measured as lenticular astigmatism. SETTING: Department of Ophthalmology, Inönü University Medical Faculty, Turgut Ozal Medical Center, Malatya, Turkey. METHODS: This cross-sectional masked case-control study comprised 32 eyes of 32 patients with established TDS (13 men, 19 women; mean age 21.31 years +/- 7.05 [SD]) and 20 age- and sex-matched healthy control subjects (8 men, 12 women; mean age 22.65 +/- 7.11 years) with a comparable amount of myopic astigmatism (spherical equivalent) without TDS. The optic disc was morphometrically analyzed by planimetric evaluation of optic disc photographs. The total refractive and keratometric corneal astigmatism was obtained, and lenticular astigmatism was calculated by vector analysis. The Mann-Whitney U test was used for statistical analysis; 1 eye of each patient was evaluated in both groups. A P value less than 0.05 was considered statistically significant. RESULTS: The mean spherical equivalent refraction was comparable in TDS patients (-4.73 +/- 1.12 diopters [D]) and controls (-4.28 +/- 1.29 D) (P =.210). The mean total astigmatism was higher in TDS patients (-2.96 +/- 1.04 D) than in the controls (-2.51 +/- 1.09 D), but the difference was not significant (P =.151). The mean corneal astigmatism was comparable in TDS patients (-2.07 +/- 0.83 D) and controls (-2.28 +/- 0.87 D) (P =.454), but the calculated mean lenticular astigmatism was significantly higher in TDS patients (-1.31 +/- 0.98 D and -0.20 +/- 0.35 D, respectively) (P <.001). Twenty-nine of 32 TDS patients (90.6%) had lenticular astigmatism; in 16 (50%), it was greater than -1.00 D. Lenticular astigmatism was present in 7 controls (35%); in 2 (10%), it was greater than -1.00 D. The mean keratometry was significantly higher in TDS patients (43.84 +/- 1.06 D) than in the controls (42.75 +/- 1.45 D) (P =.011). CONCLUSIONS: Clinically significant lenticular astigmatism was present in TDS patients. If an abnormal optic disc shape is found on ophthalmoscopy, lenticular astigmatism as well as corneal astigmatism should be carefully evaluated to prevent an unsatisfactory refractive outcome, especially in refractive surgery candidates.

Adolescent↗

Urinary adrenomedullin levels are increased and correlated with plasma concentrations in patients with Behçet's syndrome.

BACKGROUND: The objective was to measure urinary adrenomedullin (AM) levels in patients with active or inactive Behçet's syndrome and compare them to levels in healthy control subjects. METHODS: Forty-five consecutive patients with Behçet's syndrome (20 men and 25 women with a mean age of 37.7 +/- 10.8 years) and 20 age- and sex-matched healthy hospital staff volunteers as control subjects (nine men and 11 women with a mean age of 36.2 +/- 10.4 years) were studied. Urinary and plasma AM concentrations were measured by high-performance liquid chromatography. We also investigated whether disease activity correlates with urinary and plasma AM levels. The Mann-Whitney U-test was used in statistical analysis and the values were expressed as mean +/- SD. RESULTS: Urinary excretion of AM (pmol per mg urinary creatinine) in patients with Behçet's syndrome (81.3 +/- 35.1) was significantly higher (P < 0.001) than in control subjects (31.2 +/- 16.1). Plasma AM levels (pmol/L) in patients with Behçet's syndrome and controls were 69.1 +/- 19.2 and 20.7 +/- 11.8, respectively; the difference was significant (P < 0.001). Although active Behçet's syndrome patients (n = 22) had higher urinary AM levels (92.1 +/- 41.1) compared to inactive (n = 23; 70.8 +/- 32.2), the difference was not significant (P > 0.05). Plasma AM levels in active Behçet's syndrome patients (77.5 +/- 21.2) were also higher than in inactive (61.6 +/- 17.3), but the difference was not significant (P > 0.05). CONCLUSION: Urinary AM levels were higher in Behçet's patients than in control subjects. Urinary AM levels were correlated with plasma AM levels. The results suggest that the higher AM levels found in the urine may be produced by the kidney as a result of the stimulation of inflammation during the course of Behçet's syndrome, or may come from plasma, as plasma AM levels were increased. However, the exact sites of AM synthesis by the kidney (e.g. glomeruli, blood vessels and/or tubular cells) could not be determined in this study. Further studies in this respect are necessary.

Adolescent↗

Central corneal thickness is lower in osteogenesis imperfecta and negatively correlates with the presence of blue sclera.

BACKGROUND: Osteogenesis imperfecta (OI) is a rare, autosomal-inherited, connective tissue disorder characterised by bone fractures, deafness and blue sclera. Additional ocular findings are decreased ocular rigidity, myopia, glaucoma, keratoconus, corneal opacity, small corneal diameter and congenital Bowman's layer agenesis. PURPOSE: This cross-sectional, masked, case-control study aimed to assess whether central corneal thickness (CCT) is affected in patients with OI and to focus on the clinical significance of scleral blueness. MATERIALS AND METHODS: Twenty-three children with OI (13 boys, 10 girls) and 15 age-, sex- and refraction-matched healthy control subjects (eight boys, seven girls) were assessed for CCT by ultrasound pachymetry. The CCT was compared between two different patient subgroups (type-I OI with blue sclera, n = 12; type-IV OI without blue sclera, n = 11). Mann-Whitney U-test or analysis of variance was used as indicated and only right eyes of each subject were included in statistical analysis. Results were expressed as mean +/- S.D. and statistical significance was taken as p < 0.05. RESULTS: Mean age and sex distribution was similar between the groups (10.1+/-2.5 vs 9.8+/-1.8 years, p > 0.05). Patients with OI had significantly lower CCT (459.5+/-24.6 microm) than in control subjects (543.6+/-21.4 microm; p < 0.001). The CCT was below 500 microm in 22 of 23 children (95.6%) with OI, 15 of which (65.2%) were below 450 microm. In contrast, CCT was over 500 microm in all eyes in the control group. Type-I OI eyes with blue sclera had significantly (p = 0.005) lower CCT readings (446.5+/-16.3 microm) than type-IV OI eyes without blue sclera (473.6+/-25.0 microm). Mean keratometric values were similar between the groups (44.2+/-1.7 vs 43.8+/-1.6 dioptre, p > 0.05). Mean cycloplegic refraction was similar between the groups (-0.32+/-0.5 vs -0.18+/-0.4 dioptre; p > 0.05), although five of 23 OI patients had myopia, and mean intraocular pressure was lower in OI patients than controls (12.7+/-1.8 mmHg vs 15.6+/-1.9 mmHg; p < 0.001). CONCLUSIONS: The CCT is thinner and negatively correlated with the blueness of the sclera in patients with OI. The CCT readings may therefore be of utmost importance in the diagnosis of OI. An ophthalmologist should be aware of an artificially low intraocular pressure measurement in such patients. In addition, when considering a keratorefractive treatment, CCT must be evaluated carefully to avoid unexpected results or complications. Sturdy protective spectacles should be prescribed to those who are not bed bound. Possible correlation of low CCT with biochemical changes in scleral collagen or systemic parameters awaits further investigation.

Adolescent↗

Increased nitric oxide production in patients with Behçet's disease: is it a new activity marker?

BACKGROUND: The origin of Behçet's disease (BD) is unclear. One of the prominent features of BD is vasculitis and thrombosis as a result of endothelial dysfunction. Because nitric oxide (NO) is synthesized by endothelium, we considered it as an interesting target of investigation in BD. OBJECTIVE: Our purpose was to define the level of NO in the serum of patients with BD and its relation with disease activity. METHODS: As an indicator for NO, serum total nitrite levels (end product of NO) were measured by Griess reaction in 52 consecutive patients with BD and compared with 32 age- and sex-matched healthy staff volunteers. Serum NO levels of active and inactive patients were compared. RESULTS: The overall serum nitrite levels in patients with BD (40.25 +/- 10.51 micromol/L) were significantly higher (P <.001) than those in healthy volunteers (25.09 +/- 5.33 micromol/L). The difference in serum total nitrite levels among patients with active BD (46.74 +/- 10.62 micromol/L) and inactive BD (33.24 +/- 3.73 micromol/L) was significant (P <.001). Significant differences were observed in serum nitrite levels between patients in the inactive period of BD and the control group (P <.001). CONCLUSION: Increased NO production might be responsible for the overall inflammatory process of BD. NO seems to be related to disease activity.

Adult↗

Serum levels of TNF-alpha, sIL-2R, IL-6, and IL-8 are increased and associated with elevated lipid peroxidation in patients with Behçet's disease.

AIM: Behçet's disease (BD) is asystemic immunoinflammatory disorder and the aetiopathogenesis is to be specified. Cytokines play a role in immune response and in many inflammatory diseases. The aim of this case-control study is to investigate serum pro-inflammatory cytokine tumour necrosis factor (TNF)-alpha, interleukin-1beta (IL-1beta), soluble IL-2 receptor (sIL-2R), IL-6, and chemokine IL-8 levels in patients with BD. We also determined the end product of lipid peroxidation (malondialdehyde (MDA)) in BD patients as an index for oxidative stress. METHODS: A total of 37 patients (19 men, 18 women) with BD (active, n = 17; inactive, n = 20) and 20 age-matched and sex-matched healthy control subjects (11 men, nine women) included in this cross-sectional, blinded study. Serum TNF-alpha, IL-1beta, sIL-2R, IL-6 and IL-8 levels were determined by a spectrophotometer technique using the immulite chemiluminescent immunometric assay. Lipid peroxidation was evaluated by Wasowicz et aL The levels of cytokines and lipid peroxidation in the active period were compared with the inactive period of the disease. Results are expressed as mean +/- standard error. RESULTS: IL-1beta levels were below the detection limits of the assay (< 5 pg/ml) in all samples. Mean levels of MDA (8.1+/-0.7 micromol/l), sIL-2R (800+/-38 U/ml), IL-6 (12.6+/-1.1 pg/ml), IL-8 (7.2+/-0.4 pg/ml), and TNF-alpha (7.9+/-0.5 pg/ml) in active BD patients were significantly higher than those in inactive patients (4.3+/-0.5 micromol/l, p < 0.01; 447+/-16 U/ml, p < 0.001; 8.3+/-0.6 pg/ml, p = 0.006; 5.3+/-0.1 pg/ml, p < 0.001; and 5.1 0.2 pg/ml, p < 0.001; respectively) or control subjects (2.1+/-0.2 micromol/l, p < 0.001; 446+/-20 U/ml, p < 0.001; 6.4+/-0.2 pg/ml, p < 0.001; 5.4+/-0.1 pg/ml, p < 0.001; and 4.7+/-0.1 pg/ml, p < 0.001, respectively). On the contrary, only the mean IL-6 level was significantly different between inactive BD and control subjects (p = 0.02). All acute phase reactants were significantly higher in active BD than in inactive period (for each, p < 0.01). CONCLUSIONS: High levels of sIL-2R, IL-6, IL-8 and TNF-alpha indicate the activation of immune system in BD. Serum sIL-2R, IL-6, IL-8 and TNF-alpha seem to be related to disease activity. Increased lipid peroxidation suggests oxidative stress in BD and therefore tissue damage in such patients. Amelioration of clinical manifestations would be envisaged by targeting these cytokines, chemokines and lipid peroxidation with pharmacological agents.

Adult↗

Craniofacial anthropometry in a Turkish population.

OBJECTIVE: To present norms and demonstrate the anthropometric variations in fronto-occipital circumference, inner and outer canthal distances, near and distant [far] anatomical interpupillary distance, canthal index, and circumference-interorbital index across age and sex in urban Turkish subjects. PARTICIPANTS: Three thousand four hundred forty-eight subjects (1852 male, 1596 female) aged 7 to 40 years were included in this study. METHODS: Three age groups were studied: children aged 7 to 15 years, young adults aged 16 to 25 years, and adults aged 26 to 40 years. Mean values for each measured parameter were determined at each age between 7 and 25 years. Subjects were also divided into nine age subgroups to observe the change of each parameter with advancing age. RESULTS: The fronto-occipital circumference and outer canthal distance of males was significantly (p <.001) wider than females in all age groups. The near and distant interpupillary distances of male subjects were, on average, wider than the female subjects with greater differences with advancing age. Across all subjects aged 7 to 40 years, the mean of all measured parameters and calculated indexes of men and boys was significantly different from girls and women (p <.001). The mean for interpupillary distances in our study in both sexes were found to be similar to Arabian, Hong Kong, and British children; larger than those of Chinese, Black, Indian, and Caucasians; and smaller than those of Mexican children and a mixed European population. CONCLUSION: This study clearly shows the anthropometric variation for fronto-occipital circumference, inner canthal distance, outer canthal distance, near and distant interpupillary distance, canthal index, and circumference-interorbital index with age. These developmental data and the normal values of these measurements in healthy subjects are useful for dysmorphologists in the early identification of some craniofacial syndromes, hyper- and hypotelorism, and congenital or posttraumatic telecanthus and of planning surgical intervention. We suggest that the comparison of craniofacial dimensions of a patient must be performed with normal standards specific for age as well as sex and race.

Adolescent↗