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    Mean platelet volume in retinal vein occlusion
    (Verduci Publisher, 2014) Ornek, N.; Ogurel, T.; Ornek, K.; Onaran, Z.
    OBJECTIVE: The exact pathogenic mechanism underlying the thrombotic tendency in retinal vein occlusion (RVO) is still not fully established. We investigated relationship between platelet indices including mean platelet volume (MPV) and platelet count in RVO patients compared to control group. PATIENTS AND METHODS: Forty six patients (19 female, 27 male) diagnosed as RVO were included in the study. Forty-six subjects (26 female, 20 male) served as controls. Patients were evaluated by careful biomicroscopic examination using a fundus contact lens and fluorescein angiography. Blood samples for total blood count with MPV were obtained after overnight fasting from the antecubital vein. RESULTS: The mean platelet volume was 8.11 +/- 1.15 fl in RVO group. It was 8.68 +/- 0.98 fl in controls. When compared, the mean MPV was significantly lower in RVO patients (p < 0.05). The mean platelet volume was also significantly lower in branch retinal vein occlusion group in comparison to controls (7.92 +/- 1.19 fl. versus 8.68 +/- 0.98 fl.) (p < 0.05). CONCLUSIONS: MPV was significantly lower in patients with RVO than control group. MPV does not seem to be a potentially useful biomarker for prediction of RVO.
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    Retinal nerve fiber layer thickness in the acute phase of sildenafil treatment
    (Verduci Publisher, 2015) Ornek, K.; Tuglu, D.; Ogurel, R.; Ornek, N.; Yilmaz, E.; Batislam, E.
    OBJECTIVE: To evaluate the early effect of sildenafil on the retinal nerve fiber layer (RNFL) thickness. PATIENTS AND METHODS: Sixty eyes of 60 patients were enrolled in the study. The patients underwent RNFL analysis by scanning laser polarimetry (Nerve Fiber Analyzer, GDx VCC: 5.3.3; Laser Diagnostic Technologies, San Diego, CA, USA) before and after a single 100 mg dose of sildenafil. Sixty eyes of 60 volunteers of similar age and sex distribution were taken as the control group. The RNFL thickness parameters evaluated included temporal, superior, nasal, inferior, temporal (TSNIT) average, superior average (SA), inferior average (IA), TSNIT standard deviation (SD), and nerve fiber index (NFI). RESULTS: The mean age of the patients was 53,52 +/- 9,26 years. The mean pre- and post-treatment TSNIT, SA, IA, TSNIT SD, and NFI of the patients were 57.46 +/- 4.94 mu versus 56.90 +/- 4.59 microns (mu), 68.93 +/- 6,12 mu versus 67,79 +/- 5,49 mu, 66,71 +/- 7.10 mu versus 66.31 +/- 6.82 mu, 24 +/- 3.86 mu versus 23.40 +/- 4.05 mu, and 16.50 +/- 6.08 mu versus 14.92 +/- 6.76 mu, respectively. There were no statistically significant differences between pre- and post-treatment RNFL thicknesses (p = 0.527, p = 0.281, p = 0.754, p = 0.416, p = 0.185, respectively). CONCLUSIONS: A single 100 mg dose of sildenafil seems to have no unfavorable effect on RNFL thickness in the acute phase of treatment.