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Cutan Ocul Toxicol ; 38(3): 290-293, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31010341


Purpose: Carvone (CVN) is a natural monoterpene found in essential oils of many aromatic plant species. In this study, we investigated the protective effect of CVN against paclitaxel (PTX)-induced retinal and optic nerve cytotoxicity in rats. Methods: Twenty-four male adult Wistar albino rats (250-400 g) were randomized into four equal groups comprising six animals in each. Group 1 (control group) received intraperitoneal (i.p.) saline solution (0.5 mL/200 g) weekly for 4 weeks. Group 2 received i.p. CVN [(S)-(+)- CVN, (5S)-5-Isopropenyl-2-methyl-2-cyclohexen-1-one, C10H14, 25 mg/kg], while Group 3 received i.p. PTX (5 mg/kg) weekly for 4 weeks. Group 4 received i.p. CVN (25 mg/kg) 30 min after i.p. PTX (5 mg/kg) weekly for 4 weeks. At the end of the experimental period, retinal and optic nerve tissues were evaluated histopathologically. Results: All retinal specimens in control and CVN groups were histopathologically normal. In PTX group all eyes (6/6) demonstrated increased retinal vascularity and rosette-like structures in the outer nuclear layer, while in PTX-CVN group all eyes (6/6) demonstrated normal retinal vascularity and absence of rosette-like structures. All optic nerve specimens in control and CVN groups were histopathologically normal. In PTX group all eyes (6/6) demonstrated severe vacuolization and decrease in the number of astrocytes and oligodendrocytes, while 3 eyes (3/6) demonstrated marked single cell necrosis. In PTX-CVN group, 4 eyes (4/6) demonstrated moderate vacuolization while, 2 eyes (2/6) had none. Compared with PTX group, 1 eye (1/6) in PTX-CVN group demonstrated a decrease in numbers of astrocytes and oligodendrocytes while 5 eyes (5/6) were normal. No remarkable single cell necrosis was observed in PTX-CVN group. Conclusions: Our histopathological findings demonstrated the potential protective role of CVN against PTX-induced retinal and optic nerve cytotoxicity. CVN might be a promising molecule in counteracting oxidative stress-based cytotoxicity in the field of retinal and optic nerve disorders.

Antineoplásicos Fitogênicos/efeitos adversos , Monoterpenos Cicloexânicos/uso terapêutico , Nervo Óptico/efeitos dos fármacos , Paclitaxel/efeitos adversos , Substâncias Protetoras/uso terapêutico , Retina/efeitos dos fármacos , Animais , Masculino , Nervo Óptico/patologia , Ratos Wistar , Retina/patologia
Turk J Ophthalmol ; 48(2): 85-88, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-29755822


Large radial tears of donor Descemet membrane (DM) during the preparation of Descemet membrane endothelial keratoplasty (DMEK) grafts can make the trephination stage impossible because of small graft diameter. This results in irregular-edged grafts. In this study, we report two pseudophakic bullous keratopathy patients who underwent DMEK surgery with irregular-edged Descemet membrane (DM) grafts. Main outcome measures were preoperative and postoperative 1-, 3-, and 6-month best corrected visual acuity (BCVA), endothelial cell density (ECD) and central corneal thickness (CCT). Intraoperative and early postoperative complications were also evaluated. Both irregular-edged grafts were successfully implanted into the anterior chamber, unfolded, and attached to the posterior corneal stroma. Patients' BCVA at 6 months was 1.0 (Snellen equivalent: 20/20) and 0.6 (Snellen equivalent: 20/32) respectively. Decrease in ECD at the last visit was 27% and 25%. CCT decreased from 723 µm and 850 µm to 530 µm and 523 µm, respectively. No intraoperative complications occurred except for the large radial Descemet membrane graft tears that developed during donor DM stripping. None of the cases needed a rebubbling procedure postoperatively. We have demonstrated that irregular-edged DM grafts can be successfully implanted for DMEK surgery with good clinical outcomes.

Int Ophthalmol ; 38(5): 2223-2226, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-28942471


PURPOSE: To report two cases with an acute vision loss due to intracapsular hemorrhage (hematoma) after an uncomplicated gonioscopy-assisted transluminal trabeculotomy (GATT) combined with phacoemulsification surgery. METHODS: Case report. RESULTS: Seventy-six-year-old male and 75-year-old female patients with cataract and pseudoexfoliative glaucoma (XFG) uncontrolled with maximum medical therapy both underwent GATT combined with phacoemulsification. Shortly after the surgery, intracapsular hematoma behind the intraocular lens (IOL) were noted in both patients. Hematoma cleared in both of them via IOL extraction-anterior vitrectomy and YAG-laser capsulotomy, respectively. Hematoma cleared in both patients without any surgical complications. CONCLUSIONS: Vision loss due to unclearing intracapsular hematoma might be an early complication of combined GATT and phacoemulsification surgery.

Cegueira/etiologia , Hemorragia Ocular/complicações , Gonioscopia/efeitos adversos , Hematoma/complicações , Facoemulsificação/efeitos adversos , Complicações Pós-Operatórias , Trabeculectomia/efeitos adversos , Idoso , Cegueira/diagnóstico , Catarata , Síndrome de Exfoliação/diagnóstico , Síndrome de Exfoliação/cirurgia , Hemorragia Ocular/diagnóstico , Feminino , Seguimentos , Hematoma/diagnóstico , Humanos , Pressão Intraocular , Cápsula do Cristalino/irrigação sanguínea , Masculino , Remissão Espontânea