Visual and anatomic outcomes of aflibercept treatment in treatment-naive patients with neovascular age-related macular degeneration; real-life data over 24 months.

PURPOSE: The aim of this study is to evaluate the 2-year visual and anatomic results of treatment with intravitreal injections of aflibercept in newly diagnosed, treatment-naive patients with neovascular age-related macular degeneration in routine clinical practice of a tertiary hospital of Southwestern Greece. METHODS: In this retrospective, single-center, non-randomized case-series study we analyzed the records of 32 treatment-naive eyes of 28 patients treated with intravitreal injections of aflibercept. Patients received treatment in the Department of Ophthalmology of the University Hospital of Patras from January 2017 to August 2019. The scheduled treatment regimen included a loading dose of 3 consecutive monthly injections of aflibercept and then injections at 8-week intervals for the next 9 months followed by a treat and extend treatment during the second year. Data such as age, gender, best corrected visual acuity (BCVA) and number of injections were recorded. Spectral domain optical coherence tomography (SD-OCT) findings including presence or absence of fluid and automated central macular thickness measurement at baseline, 12 and 24 months were also recorded. RESULTS: The mean age of the patients (14 male, 14 female) was 78.5±7.73 years. Over a period of 12 months, and after a median number of 6 visits (range 3-10), patients received a median number of 6 intravitreal injections of aflibercept (range 3-8). Twenty eyes completed 2 years of treatment with aflibercept. Over the 2-year period patients conducted a median of 14 visits (range 9-15) and received a median number of 10 IVAs (range 6-13). The median logMAR BCVA at 12 months was significantly better compared to baseline [0.412 (range 0.046-1.097) versus 0.549 (range 0-1.301) respectively; p=0.003] while median logMAR BCVA at 24 months [0.398 (range 0.222-1.097)] did not differ significantly compared to baseline (p=0.295). The central macular thickness at baseline was 398.75±98.16 µm and decreased statistically significantly at 12 (295.81±80.48 µm) and 24 months (289.29±34.25 µm) compared to baseline (p=0.0002 and p=0.002, respectively). At baseline SD-OCT examination subretinal fluid (SRF) was present in 26 eyes (81.25%), intraretinal fluid (IRF) was present in 20 eyes (62.5%) while pigment epithelium detachment (PED) was observed in 28 eyes (87.5%) At 12 months SRF was present in 16 eyes (50%), IRF was present in 10 eyes (31.25%) while PED was observed in 23 eyes (71.88%). At 24 months examination SRF was present in 4 eyes (20%), IRF was present in 10 eyes (50%) while PED was observed in 14 eyes (70%). No serious adverse events occurred during this period. CONCLUSION: Treatment with intravitreal injections of aflibercept in a real life setting resulted in a significant improvement in BCVA at 12 months and in a significant anatomic restoration throughout the 24-month follow-up.

Functional and anatomic results of up to 24 months aflibercept treatment for diabetic macular edema in real-life setting.

PURPOSE: Treatment with intravitreal injections of anti-vascular endothelial growth factors, like aflibercept, has revolutionized the management of diabetic macular edema. The purpose of this study is to evaluate the 2-year results of treatment with aflibercept in newly diagnosed, treatment-naive patients with diabetic macular edema in a real-life setting in a tertiary hospital of Southwestern Greece. METHODS: In this retrospective, real-life, single-center, cohort study the records of diabetic patients were reviewed. In the study we included treatment naive eyes that started treatment with intravitreal injections of aflibercept in the Department of Ophthalmology of the University Hospital of Patras. The scheduled treatment regimen of aflibercept was based on the Summary of Product Characteristics of the product and included a loading dose of 5 monthly aflibercept injections followed by bimonthly treatment until the completion of the first year. During the second year a treat and extend treatment regimen was applied. We recorded data such as age, gender, number of visits and injections, best corrected visual acuity (BCVA) and central macular thickness (CMT) as it was evaluated by a spectral domain optical coherence tomography (SD-OCT). RESULTS: Thirty treatment-naive eyes of 22 patients (14 male, 8 female) received treatment with aflibercept for at least 1 year during the period between January 2017 and August 2019. The mean age of the patients was 68.64±7.35 years. Ninety percent of the patients suffered from type-II diabetes and 9% from type-I. The median time between the diagnosis of diabetic macular edema and initiation of treatment with intravitreal injections of aflibercept was 0.5 months (range 0-3 months). Median baseline logMAR BCVA was 0.398 (range 0.046-1.301). The mean CMT at baseline was 388.0±162.94µm. Over a period of 12 months, and after a mean number of 7.5±2.3 visits, patients received a mean number of 7±1.12 intravitreal injections of aflibercept. Eighteen eyes (60%) received an induction phase with 5 monthly injections according to aflibercept SPC. After 12 months the median BCVA (0.324, range 0.0-1.3) was statistically significantly better compared to baseline (p=0.024) and the CMT (295.67±70.99) was significantly lower compared to baseline (p=0.017). Eighteen eyes (60%) completed 2 years of treatment with aflibercept. Over the 2-year period patients made a mean number of 12.7±3.08 visits and received a mean number of 10.2±1.64 intravitreal injections of aflibercept. The median logMAR BCVA at 2 years (0.301, range 0-0.52) was statistically significantly better compared to baseline (p=0.013) and the CMT (293.53±65.93) was significantly lower compared to baseline (p=0.01). No serious adverse events were recorded during this period. CONCLUSION: Aflibercept resulted in significant functional and anatomic improvement after 12- and 24-month treatment in diabetic macular edema eyes in a real-life setting. The majority of the eyes completed the 2-year treatment regimen of aflibercept.

Α molecular epidemiological analysis of adenoviruses from excess conjunctivitis cases.

BACKGROUND: Τo perform a molecular epidemiological analysis of viral conjunctivitis among excess conjunctivitis cases recorded at the University Hospital of Patras, Greece, for the period March to June 2012. METHODS: A structured questionnaire containing demographic and clinical data was developed in order to collect retrospective data on the cases. Eye swab specimens were collected and molecular detection of adenoviruses was performed by nested PCR. Positive results were confirmed by sequencing. To determine the relatedness between the isolated sequences, a phylogenetic analysis was conducted. RESULTS: The epidemiological analysis (including retrospective data) included 231 conjunctivitis cases (47.1% male, and 52.8% female). Based on clinical features 205 of the cases were diagnosed of viral origin (46.3% male and 53.7% female), 4 of bacterial origin (50% male and 50% female) while 22 were undefined conjunctivitis. The outbreak excess cases (included 156 cases) affected all age groups regardless gender predilection. For the positive samples indicated that 29 samples (72.5%) were AdV17, and 5 (12.5%) as AdV54. CONCLUSIONS: Molecular analysis could define the cause of viral conjunctivitis, while epidemiological data contributed to the assessment of the risk factors and underlined possible preventive measures. This study is one of the very few on viral conjunctivitis in Greece. This outbreak underscores the need for a national surveillance system for acute infectious conjunctivitis outbreaks. The epidemiological as well as molecular investigation on HAdV ocular infections is rather absent in Greece, which has no surveillance system for viral conjunctivitis.

University faculty on student motivation to use medical education apps and barriers to their usage.

OBJECTIVE: University teachers, who primarily provide guidance and advice to their students, can play a significant role in educational process transformation. As there is no particular e-learning framework, it is important to understand the factors and variables that may impact both its effective usage and further successful implementation. The current study aims to outline the influence of university faculty, and possible barriers preventing medical students from using apps for learning purposes. SUBJECTS AND METHODS: Α cross-sectional study was conducted with an online survey questionnaire. The population of the study included 1,458 students from all the seven Greek schools of medicine. RESULTS: University faculty (51.7%), followed by fellow students and friends (55.6%), constitute the second most common source of information on adopting apps for medical education. 45.8% of students rated their educational guidance as insufficient/inadequate, 33.0% as moderate, 18.6% as quite good, and only 2.7% as sufficient/complete. University professors have proposed certain apps to 25.5% of students. PubMed (41.7%), Medscape (20.9%), and Complete Anatomy (12.2%) were the leading suggestions. The main barriers to app usage were the lack of knowledge of apps' benefits (28.8%), insufficient updates of their content (21.9%), their cost-effectiveness (19.2%), and financial reasons (16.2%). Most students preferred using free apps (51.4%) and 76.7% preferred universities to cover apps' expenses. CONCLUSIONS: University faculty represent the main source of information regarding the adaptation of medical apps in the educational process. However, students need improved and enhanced guidance. The main barriers are ignorance about apps and financial reasons. The majority prefer free apps and universities to cover their cost.

Medical application usage traits by students in Greece.

OBJECTIVE: Medical applications ("apps") can offer innovative educational capabilities, facilitating the acquisition of learning objectives and enhancing decision making. The present study aims at demonstrating the usage characteristics and relevant perceptions among students in seven medical schools in Greece. MATERIALS AND METHODS: A descriptive cross-sectional study was conducted through an online survey. Popularity, usage patterns and medical student perceptions regarding medical apps were studied. RESULTS: A total of 1,458 undergraduate medical students participated, 99.2% owned a smartphone, 72.8% were aware of medical apps' existence, although only 53.9% used them. Apps awareness was higher in higher-ranked universities. Overall, 46% used 1-3 apps, 7.9% more than four apps. 40.3% stated apps' usage at least 1-3 times a month, followed by 16.0% using them 1-3 times per week. Only 2.5% reported daily usage. Students who used more apps tend to use them more frequently. 77.3% used at least half of the downloaded apps. Awareness of medical apps, number of apps in use and frequency of usage tend to increase in each succeeding year of study. The most popular apps and the main reasons of usage are presented in this study. Current and future perceptions have been investigated. No disparities have been observed between genders. CONCLUSIONS: Overall medical apps usage was relatively low, despite the high percentage of smartphone ownership. Quantitative traits are enhanced across the progression of medical studies. Utilization frequency is higher in those using more apps. Distinct utilization patterns were identified between preclinical and clinical students, possibly depicting particular needs, portraying apps as a special adjunctive educational tool.

Evaluation of intraocular pressure in the first 24hours after micropulse laser trabeculoplasty in eyes with pseudoexfoliation glaucoma.

PURPOSE: To evaluate the immediate 24-hour effect on intraocular pressure (IOP) of a single session of micropulse laser trabeculoplasty (MLT) in patients with pseudoexfoliation glaucoma (PEXG). PATIENTS AND METHODS: In this single-center, one-arm, prospective study, patients with PEXG on prostaglandin analogue monotherapy with inadequate IOP control were treated with 360-degree 532nm MLT. Intraocular pressure was evaluated at 1, 4, 8, 12 and 24hours after MLT. Twenty-three eyes of eighteen patients (10 male, 8 female) were enrolled in the study. RESULTS: The mean age of the patients was 71.83±6.51 years, and the mean IOP prior to MLT was 20.61±1.8mmHg. The mean IOP was reduced by 2.17±3.31mmHg, 2.69±3.85mmHg, 0.87±3.02mmHg, 2.13±2.8mmHg and -0.87±3mmHg at 1, 4, 8 and 24hours after MLT, respectively. At 4 and 12hours after MLT, the mean IOP was statistically significantly lower compared to the pre-MLT IOP (P=0.043 and P=0.021 respectively). No eye experienced an IOP spike≥5mmHg during the first 24hours after MLT. CONCUSION: Treatment with MLT in PEXG eyes did not result in any significant, potentially dangerous IOP spikes during the first 24hours after MLT.

Collagen type IX and HNK-1 epitope in tears of patients with pseudoexfoliation syndrome.

Pseudoexfoliation syndrome (PEX) is an age-related condition, which may cause open-angle glaucoma and has increasing interest since it seems to affect additional human tissues, i.e., cardiovascular tissue, skin, and still lacks elucidated pathogenesis. Collagen type IX and HNK-1 epitope have been considered characteristic constituents of the aqueous humour of PEX patients, since their amounts were increased in PEX aqueous humour compared to normal eyes. Since it has been proposed that the initial manifestations of PEX syndrome occur in conjunctiva, the present study was undertaken to investigate the presence of the same antigens in tears of PEX patients and their possible use as the biochemical markers for early diagnosis. Tears of PEX patients and healthy individuals were subjected to western blotting analysis for various basement membrane components identified in aqueous humour. It was found that collagen type IX and HNK-1 epitope were present in tears, the amount of the former being increased 2.7 times compared to normal (P<0.05), surprisingly high as compared with total protein or lysozyme activity in tears, which were found to be increased in PEX patients about 25% with no statistical differences (P approximately 0.4). The results suggest the possible use of tears' collagen type IX for the diagnosis of PEX syndrome.

Immunization with specific polysaccharide antigen reduces alterations in corneal proteoglycans during experimental slime-producing Staphylococcus epidermidis keratitis.

PURPOSE: Staphylococcus epidermidis is a leading cause of bacterial keratitis associated with corneal damage. Corneal integrity is closely associated with matrix macromolecules, such as proteoglycans (PGs) and collagen. The aim of this study was to examine whether active immunization (AI) using a major immunogenic polysaccharide determinant of slime (20-kDa PS) as antigen, and passive immunization (PI) after administration of specific antibodies toward 20-kDa PS affect the distribution of PGs as well as corneal lesions in an experimental model of slime-producing S. epidermidis keratitis. METHODS: For AI, seven rabbits were immunized with 20-kDa PS, whereas for PI, seven rabbits received specific antibodies against 20-kDa PS. Lesions were graded clinically for a 21-day period. Levels of 20-kDa PS antibodies in serum and aqueous humor in both immunization groups were determined by ELISA. The distribution of certain extracellular matrix PGs during corneal healing was analyzed immunohistochemically. RESULTS: Levels of specific anti-20-kDa PS antibodies in serum and aqueous humor obtained after either AI or PI were significantly higher as compared with those in the respective nonimmunized control groups (p<0.001). Clinical grading showed that both AI and PI rabbits had a significantly less corneal damage as compared with infected nontreated rabbits. Immunohistochemical analyses for PGs exhibited significant differences to the wounded regions as compared with noninfected corneal tissue. Accumulation of keratan sulfate PGs and decorin was observed in the corneal stroma of infected rabbits and of heparan sulfate PGs around the new-formed vessels. This phenomenon was significantly reduced in immunized animals in accordance with macroscopically decreased corneal damage observed in these animals. CONCLUSIONS: Results of this study suggest a key role of 20-kDa PS and its antibodies as prophylactic and therapeutic agents in keratitis caused by slime-producing S. epidermidis.

Glutathione and lipid peroxide changes in pseudoexfoliation syndrome.

PURPOSE: To investigate the oxidative status of the aqueous humor of patients with pseudoexfoliation (PEX) syndrome. METHODS: Aqueous humor samples obtained during cataract surgery of patients with PEX syndrome and normal age-matched control subjects were examined for changes in the levels of glutathione (GSH), glutathione disulfide (GSSG), and TBA reactive species (TBARS), products of lipid peroxidation. GSH, GSSG, and TBARS were determined by specific fluorescent assays. RESULTS: Compared to normal controls, PEX syndrome aqueous humor samples showed a decrease of up to 28% of GSH concentration, and GSSG was increased up to 23%. The ratio of GSH/GSSG was 1.7-fold decreased in PEX syndrome samples. TBARS levels were increased by 100% in the PEX aqueous humor samples as compared to the controls. CONCLUSIONS: High levels of GSSG and TBARS indicate high oxidative stress, as well as the decrease in the ratio of GSH/GSSG. Our findings suggest a role for oxidation stress in the pathogenesis and the progression of PEX syndrome.

Alterations in conjunctival cytology and tear film dysfunction in patients with beta-thalassemia.

PURPOSE: Patients with beta-thalassemia (beta-tha) represent a group with lifelong transfusion-dependent anemias. This study aimed to describe the conjunctival changes and tear film parameters in these patients. METHODS: A total of 52 patients (104 eyes) with beta-tha major and 22 normal control subjects (44 eyes) were studied during 1999 through 2000. Tear film break-up time (BUT), Schirmer test, rose Bengal staining, and cytologic evaluation of the conjunctival epithelium were performed in all subjects. The Papanicolaou and May-Grümwald-Giemsa staining procedures were performed on all smears. Patients and control subjects were compared for tear function parameters and conjunctival changes. RESULTS: The BUT, Schirmer test, and rose Bengal staining values were significantly lower (P < 0.001) in beta-tha patients than in control subjects. Keratinized cells were observed in conjunctival samples in 41% of patients, with a decrease in the number of goblet cells per slide in 64% of patients. In 9% of beta-tha patients, there were a slightly greater number of inflammatory cells than in control eyes. CONCLUSION: Ocular surface disorder of these patients was characterized by goblet cell loss and conjunctival squamous metaplasia. Our findings were correlated positively with the variable age. Epithelial damage by toxic reaction and disorder of tear quality and quantity are implicated as important factors in the pathogenesis of the ocular surface disease in beta-tha patients.

Changes in HNK-1 epitope and collagen type IX in the aqueous humour of patients with pseudoexfoliation syndrome.

PURPOSE: To investigate alterations in the proteoglycan (PG) and glycosaminoglycan (GAG) content of the aqueous humour in patients with pseudoexfoliation syndrome (PEX). MATERIALS AND METHODS: Aqueous humor samples were obtained during cataract surgery from nineteen patients bearing PEX features and twenty-three age-matched normal controls. Protein and IgG were quantified densitometrically after their electrophoretic separation. Collagen type IX, 3-sulphoglucuronic acid (HNK-1 epitope), biglycan and heparan sulphate proteoglycans were detected in Western and dot blots by using specific monoclonal antibodies (MAbs). The immunochemical analysis was performed in native aqueous humour or after degradation of the glycosaminoglycans with chondroitinases. RESULTS: Degradation of the samples with chondroitinases ABC, AC and B revealed that, in the aqueous humour from PEX eyes, collagen type IX and biglycan had a more dermatan sulphate than did normal eyes. In addition, more HNK-1 epitope was observed in PEX eyes, which after similar enzymatic treatment was found to be located mainly in dermatan sulphate sequences. 3-sulphoglucuronic acid was a constituent of the GAG chains of the collagen type IX. We found that the electrophoretic mobility of the bands of collagen type IX and HNK-1 epitope was exactly the same in the aqueous humour of normal and PEX samples; both migrated as four bands at 120, 113, 92.6 and 56 kDa. The PGs bearing heparan sulphate were found only in normal samples. Other PGs were not detected. CONCLUSIONS: Because no significant difference was observed in the concentration of albumin and IgG in PEX and normal samples, the blood-aqueous barrier was probably not significantly compromised in PEX patients with cataract but without open-angle glaucoma. The results support the hypothesis that the pathogenesis of PEX can be linked to disturbed metabolism of GAGs and PGs.

Levels of specific antibodies towards the major antigenic determinant of slime-producing Staphylococcus epidermidis determined by an enzyme immunoassay and their protective effect in experimental keratitis.

Staphylococcus epidermidis is an important cause of bacterial keratitis. Certain S. epidermidis strains produce an extracellular slime layer rich in an acidic polysaccharide with a molecular size of 20 kDa (20-kDa PS). We have demonstrated that the level of 20-kDa PS-specific antibodies significantly rises after establishment of slime-producing S. epidermidis bacteraemia and, furthermore, that rabbit polyclonal antibodies to 20-kDa PS opsonize cells of slime-producing S. epidermidis to a great degree and promote their clearance by polymorphonuclear cells (Arch. Biochem. Biophys. 342 (1997) 389; J. Pharm. Biomed. Anal. 22 (2000) 1029). The purpose of this study was to examine the protective and therapeutic effects both of active immunization, using 20-kDa PS as antigen, and of passive administration of specific antibodies towards the 20-kDa PS in a rabbit keratitis model. For active immunization, 20 rabbits were subcutaneously immunized with 20-kDa PS, whereas for passive immunization specific polyclonal IgG antibodies against 20-kDa PS were administered to 20 rabbits 1 day before induction of infection. Clinical observations were made weekly for 1 month and levels of 20-kDa PS antibodies in serum and aqueous humor in both immunization groups were determined by an enzyme immunoassay. The levels of specific anti-20-kDa PS IgG in serum and aqueous humor following either active or passive immunization were significantly higher as compared with control groups (P<0.001). Although, actively immunized rabbits showed significantly less corneal damage than control animals, passively immunized ones were significantly better protected as compared with both control and those actively immunized. Obtained results suggest that 20-kDa PS plays crucial role in the pathogenesis of S. epidermidis keratitis and that both types of immunization significantly protect against corneal S. epidermidis pathology and damage.

Bilateral panophthalmitis as the initial presentation of meningococcal meningitis in an infant.

Endophthalmitis is a well-recognized, frequently devastating ophthalmic disease. The colonization of the eye and the subsequent development of endophthalmitis may be exogenous (including postsurgical and post-traumatic infections) or it may be of endogenous origin, representing a metastasis from a focus of infection elsewhere in the body associated with bacteremia (such as meningitis or cellulitis).

Pseudoexfoliation syndrome prevalence in Greek patients with cataract and its association to glaucoma and coronary artery disease.

PURPOSE: To investigate the prevalence of glaucoma and coronary artery disease (CAD) in patients with cataract and pseudoexfoliation (PEX) syndrome. METHODS: Cross-sectional study of 2140 consecutive patients with cataract admitted at the University Hospital of Patras, Greece, for cataract surgery. Only patients with senile cataract were included in this study. All patients underwent a complete ophthalmological examination that included slit-lamp evaluation with dilated pupil for PEX material in the anterior segment, intraocular pressure (IOP) measurements, and optic disc cup examination. They also underwent an evaluation for CAD by a cardiologist. CAD was considered present if a patient had a history of myocardial infarction, or ischaemia, or abnormal coronary angiography. The patients were classified into two groups: the PEX and the non-PEX group. RESULTS: One thousand and eighty-eight (50.8%) patients were men and 1052 (49.2%) were women. The overall prevalence of PEX syndrome was found to be 27.9% and it was found to increase with progressing age. Bilateral PEX was more frequent than unilateral PEX, with the percentage of bilateral PEX raising with progressing age. A total of 132 patients (22.1%) in the PEX group exhibited glaucoma, while in the non-PEX group only 2.5% suffered glaucoma. PEX was also found to be positively associated with the risk for CAD among subjects 50 years or older. No association between CAD and glaucoma was found. CONCLUSIONS: PEX syndrome constitutes a major glaucoma risk factor and a CAD risk factor. Patients with PEX should be informed and examined frequently as the risk is present throughout.

Increased aqueous humor basic fibroblast growth factor and hyaluronan levels in relation to the exfoliation syndrome and exfoliative glaucoma.

PURPOSE: To quantify the concentrations of basic fibroblast growth factor (bFGF) and hyaluronan (HA) in the aqueous humor of patients with the exfoliation syndrome (XFS) or exfoliative glaucoma (XFG). METHODS: Aqueous humor bFGF and HA levels were measured in 13 patients with XFS and in 7 patients with XFG. The results were compared with those obtained from 17 healthy controls. RESULTS: Mean bFGF levels were significantly higher in the XFG patients than those in the XFS patients, which in turn were higher than the bFGF levels in the healthy individuals. Aqueous humor HA levels in both patients with the XFS and the XFG were significantly higher compared to the controls. CONCLUSION: We suggest that bFGF plays an important role in the pathogenesis of XFS and XFG, as well as in the synthesis of secreted HA, which may result in connective tissue degradation that affects the ocular anterior segment.

Effects of oral acitretin on contrast sensitivity and tear film function: a prospective study.

The purpose of this prospective study was to investigate the ocular side effects of short-term therapy with oral acitretin (1 mg/kg/day) in 24 patients with severe and recalcitrant dermatoses. Apart from the routine ophthalmological examination, the following tests were performed: break-up time of tear film for the determination of its stability, Schirmer test for the assessment of lacrimal gland function, rose bengal staining for the detection of possible ocular surface damage and contrast sensitivity test for the evaluation of visual function. No statistically significant differences could be found between the pretreatment values of the assessed parameters and those obtained after 1 and 2 months of therapy. It seems reasonable, therefore, to suggest that ocular surface integrity and tear film and visual function are not affected by short-term oral acitretin administration.

Matrix metalloproteinases and their inhibitors in exfoliation syndrome.

The purpose of this study was to determine the expression of metalloproteinases (MMPs) and their tissue inhibitors (TIMPs) in the aqueous humour of patients with exfoliation syndrome (XFS). XFS and control samples were analysed for their MMP content by zymography and for their tissue inhibitors by ELISA. In XFS eyes, an increase for up to 60% in almost all MMPs was observed, as compared to the controls. MMP-2 and MMP-9 were found to predominate. TIMP-1 levels in XFS samples were slightly decreased, while TIMP-2 levels were similar to those of the controls. Our findings suggest that MMPs may be crucial in the progression of XFS, by degrading the abnormal fibrillar matrix components in the anterior segment tissues of XFS eyes. However, the increased levels of MMPs seem not to be able to overcome the overproduction and accumulation of the exfoliative material.

Determination of malondialdehyde by capillary electrophoresis, application to human plasma and relation of its levels with prematurity.

Malondialdehyde (MDA) is considered as the most important marker for monitoring lipid peroxidation, which is strongly associated with the development of serious diseases in adults and premature neonates. In this paper we report a method for determination of free MDA in human plasma using capillary zone electrophoresis. MDA was separated and determined as conjugate with tetrabutylammonium hydrogen sulphate (TBAS). Analysis was performed using 20 mM borare, pH = 9.3, as operating buffer and detection of the MDA-TBAS adduct at 267 nm. The method has a linear range up to 80 microM with a detection limit of 0.2 microM. The method was applied to the analysis of MDA in plasma of healthy adults, normal-gestation infants and of preterm neonates. Plasma proteins were successfully removed following centrifugation through a centricon-3 membrane. Results showed that the method can be easily and accurate applied for the determination of MDA in human plasma and that the level of MDA in pretern neonates is significantly higher (p