Ivan Tanev

Ivan Tanev


Research Focus & Metrics

Academic Career Length

11Years (2016-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 May 2016 in Journal of Cataract & Refractive Surgery
Verified
Journal Article
Closed access
Ivan TanevIvan Tanev
Ivan Tanev
VTVesselin Tanev
Vesselin Tanev
AKAnastasios John Kanellopoulos
Anastasios John Kanellopoulos
To evaluate corneal endothelial cell density (ECD) and morphology after cataract surgery using coaxial ultrasound (US) phacoemulsification or a recently introduced coaxial nanosecond laser technique. Department of Ophthalmology, Medical University of Sofia, Sofia, Bulgaria. Prospective cohort study. Coaxial US phacoemulsification was performed in 1 eye (US group) and coaxial nanosecond laser-assisted cataract surgery in the contralateral eye (laser group) of the same patient. Nuclear sclerosis was graded from nuclear opalescence (NO) 3, nuclear color (NC) 3 to NO4, NC4 using the Lens Opacities Classification System III. The central ECD, coefficient of variation (CoV) in cell size (objective measure of polymegethism), and percentage of hexagonal cells (an index of pleomorphism) were evaluated. Eighty-two eyes (41 patients) had uneventful surgery. The mean ECD was 2517 cells/mm(2) ± 137 (SD) preoperatively and 2287 ± 155 cells/mm(2) at 2 years in the US group and 2521 ± 233 cells/mm(2) and 2420 ± 292 cells/mm(2), respectively, in the laser group (both P < .001). The mean CoV was 0.27 ± 2.4 preoperatively and 0.30 ± 2.4 at 2 years in the US group and 0.27 ± 2.8 and 0.27 ± 2.0, respectively, in the laser group (both P < .001). The mean percentage of hexagonal cells was 42.3% ± 3.6% preoperatively and 37.74% ± 3.54% at 2 years in the US group and 42.8% ± 3.2% and 43.00% ± 2.68%, respectively, in the laser group (both P < .001). Nanosecond laser phacoemulsification had advantages over US phacoemulsification in terms of endothelial cell structure preservation. Dr. Kanellopoulos is consultant to Alcon Surgical, Inc., Allergan, Inc., Avedro, Inc., Keramed, Inc., Optovue, Inc., i-Optics Corp., and Carl Zeiss Meditec AG. Neither of the other authors has a financial or proprietary interest in any material or method mentioned.

5 September 2022 in Journal of Personalized Medicine
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Journal Article
Open access
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RKRadina Kirkova
Radina Kirkova
SMSnezhana Murgova
Snezhana Murgova
VKVidin Kirkov
Vidin Kirkov
Ivan TanevIvan Tanev
Ivan Tanev
Background: Age-related macular degeneration (AMD) is a progressive, degenerative disease of the central retina. AMD is subdivided into “dry” (atrophic), “wet” (exudative), and neovascular (nAMD) forms. In recent years, the concepts about nAMD changed with the development of optical coherence tomography–angiography (OCT-A) and intravitreal anti-VEGF treatment. The aim of this study was to define the morphologic type of the neovascular membrane (NVM) before treatment with OCT-A and to register vascular remodeling after treatment with anti-VEGF. We also analyzed the relationship between NVM and visual acuity. Methods: The study was retrospective and included 119 patients with newly diagnosed, treatment-naïve nAMD. All the patients underwent full ophthalmic examination and also fluoresceine angiography and optical coherence tomography–angiography (OCT-A). Results: Based on the collected data, we found repetitive regularities. Conclusion: The analysis of our results could be used as prognostic markers for the evolution of the disease and as a basis for new treatment strategies, depending on the naïve NVM morphologic type.

28 February 2023 in Journal of Personalized Medicine
Verified
Journal Article
Open access
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Ivan TanevIvan Tanev
Ivan Tanev
RKRadina Kirkova
Radina Kirkova
Background: Patients with uveitis have a higher risk of developing glaucoma not only because of the disease by itself, but also because of the ongoing corticosteroid therapy. The pathogenesis of uveitic glaucoma is characterized by a complex of biochemical and cellular processes, as well as morphological changes in the trabecular meshwork. Treatment of secondary chronic glaucoma is challenging and often requires different approaches and solutions. Purpose: To present the “ab interno” procedure of the Schlemm‘s canal (SC) performed with the help of TrabEx+ (MST, Redmond, WA, USA) in postuveitic glaucoma patients. Methods: The observed group included patients with postuveitic secondary glaucoma, which consisted of 12 pseudophakic patients (12 eyes). Patients are with intraocular pressure higher than 25 mmHg and on maximal local therapy. Due to insufficient conservative control on IOP, surgical solutions are needed. We describe a new, minimally invasive surgical procedure–the technique of the operation, the postoperative results and complications. Results: We present the achieved intraocular pressure (on the first day, 2 weeks, 1 month, 6, 8 12 and 18 months). The morphology of the trabecular area was demonstrated by gonioscopy. The effects of the therapy on the glaucoma progression, was evaluated with perimetry and OCT. Discussion: The following procedure is a minimally invasive procedure and provides good control of intraocular pressure. Aqueous veins in the conjunctiva are significantly preserved compared to conventional filtration trabeculectomy. This potentially modulates the physiological outflow pathways by ablating trabeculum strip the cause of increased outflow resistance-the inner wall of the SC. Conclusion: Removal of the inner wall of the SC, using Trabex+ (MST, Redmond, WA, USA), demonstrates promising results in the selected patients with a minimally invasive nature.

29 April 2024 in Diagnostics
Verified
Journal Article
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RKRadina Kirkova
Radina Kirkova
Svetla DinevaSvetla Dineva
Svetla Dineva
ESElisa Stradiotto
Elisa Stradiotto
Ivan TanevIvan Tanev
Ivan Tanev
Alessandra Di MariaAlessandra Di Maria
Alessandra Di Maria
A 77-year-old-man with arterial hypertension, diabetes mellitus type II presented at our clinic for a routine ophthalmological exam. He complained of intermittent double vision. The ophthalmic examination revealed paralysis of III (n. oculomotorius) and VI (n. abducens) cranial nerves with ptosis, deficit in elevation and abduction of the left eye. The patient underwent urgent MRI imaging of the brain/orbits and paranasal sinuses, and urgent neurological assessment. MRI revealed a volume-occupying process, starting from the posterior wall of the left maxillary sinus with perineural diffusion and involvement of the homolateral trigeminal nerve, intracranial spread in the medial cranial fossa and involvement of the cavernous, sphenoidal sinuses and the orbital apex on the left side. Biopsy was performed, and the histology resulted in sinonasal squamous cell carcinoma with intracranial spread.

10 June 2024 in Journal of Biomedical and Clinical Research
Verified
Journal Article
Open access
PDF file
RKRadina Kirkova
Radina Kirkova
SMSnezhana V. Murgova
Snezhana V. Murgova
VKVidin Kirkov
Vidin Kirkov
TDTsvetomir Dimitrov
Tsvetomir Dimitrov
GBGeorgi Balchev
Georgi Balchev
Ivan TanevIvan Tanev
Ivan Tanev
Age-related macular degeneration (AMD) is a degenerative, progressive disease, which destroys the central retina. AMD has two main forms - „dry“ and „wet“ (exudative). In order to make the diagnosis of AMD with CNV, apart from ophthalmoscopy, specialized tests are needed - fluorescein angiography (FA), indocyanine angiography, OCT, OCT-angiography (OCT-A). OCTA is a new and non-invasive technology. Compared to the old, well-known techniques for retinal evaluation, it is very precious because of its high resolution and detailed images – which allow early diagnosis and objective monitoring of the lesions in the future. The aim of this review is to describe the principles of function, features of the device and its application in everyday clinical practice in diagnosing patients with macular pathology. A systematic search of the literature, published in the past decade was identified from PubMed and Ovid databases with reference to the Preferred Reporting items for Systematic Review. AMD is a disease that is increasingly socially important because of the aging population in developed countries. The increasing use of OCT-A nowadays suggests new classification systems. The non-invasiveness, the short examination time and the high informativeness that OCT-A brings in relation to AMD requires a deeper study of the methodology and the development of new classifications to facilitate clinical practice.