Margarita G. Todorova

Dr. Margarita G. Todorova

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Research Focus & Metrics

Academic Career Length

22Years (2005-Present)

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

Representative Publications

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3 December 2012 in EPMA Journal
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KKKatarzyna Konieczka
Katarzyna Konieczka
AFAndreas J Flammer
Andreas J Flammer
MTMargarita G. Todorova
Margarita G. Todorova
PMPeter Meyer
Peter Meyer
JFJosef Flammer
Josef Flammer
Is the concept of integrative, preventive and personalised medicine applicable to the relationship between retinitis pigmentosa (RP) and ocular blood flow (OBF)? RP encompasses a group of hereditary diseases of the posterior segment of the eye characterised by degeneration, atrophy and finally loss of photoreceptors and retinal pigment epithelium, leading to progressive visual loss. Many different mutations affecting different genes can lead to the clinical picture of RP. Even though the disease has a clear genetic background, there are obviously other factors influencing the manifestation and progression of RP. In this review, we focus on the role of OBF. There is evidence that, in PR patients, OBF is more reduced than one would expect secondary to the retinal atrophy. The main cause of this additional component seems to be primary vascular dysregulation (PVD) syndrome. As PVD syndrome is partly treatable, a vascular evaluation of RP patients is meaningful. Based on the outcome, a targeted individualised, preventive or supportive treatment might be introduced in selected RP patients.

27 November 2014 in Acta Ophthalmologica
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Journal Article
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CTCengiz Türksever
Cengiz Türksever
SOSelim Orgül
Selim Orgül
MTMargarita G. Todorova
Margarita G. Todorova

27 April 2014 in Acta Ophthalmologica
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Journal Article
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CTCengiz Türksever
Cengiz Türksever
CVChristophe Valmaggia
Christophe Valmaggia
SOSelim Orgül
Selim Orgül
DSDaniel F. Schorderet
Daniel F. Schorderet
JFJosef Flammer
Josef Flammer
MTMargarita G. Todorova
Margarita G. Todorova

22 October 2015 in Acta Ophthalmologica
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Journal Article
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MTMargarita G. Todorova
Margarita G. Todorova
CTCengiz Türksever
Cengiz Türksever
ASAndreas Schötzau
Andreas Schötzau
DSDaniel F. Schorderet
Daniel F. Schorderet
CVChristophe Valmaggia
Christophe Valmaggia

25 April 2014 in Klinische Monatsblätter für Augenheilkunde
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Journal Article
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MTMargarita G. Todorova
Margarita G. Todorova
CTC. Türksever
C. Türksever
DSD. F. Schorderet
D. F. Schorderet
CVC. Valmaggia
C. Valmaggia
Purpose: The aim of this study was to evaluate the oxygen saturation in patients with inherited diseases of the retina. Methods: Fundus oximetry images were taken using a retinal vessel analyser (IMEDOS Systems UG, Jena, Germany). Retinal vessel oximetry was performed in 53 eyes of 27 patients suffering from inherited retinal diseases and compared to 22 eyes of 11 healthy controls. The oxygen saturation in all four major retinal arterioles (A-SO2) and venules (V-SO2) were measured and their difference (A − V SO2) was calculated. The data were compared within groups and to controls. Results: Based on V-SO2 values, the rod-cone dystrophy group (66.46 %; SD, ± 5.09) could well be differentiated from controls 54.02 % (SD, ± 3.04), from cone-rod dystrophies 57.56 % (SD, ± 5.66), as well as from inherited maculopathies 58.42% (SD, ± 4.74). The mean A-SO2 in the rod-cone dystrophy group was increased to 98.96 % (SD, ± 6.06, p < 0.014), while in the cone-rod group and in the maculopathy group it was 92.75 % (SD, ± 3.75), respectively 94.44 % (SD ± 4.85), closer to the normal values (92.68 %; SD, ± 3.53, p > 0.05). The A − V SO2 difference, as an indirect indicator for retinal oxygen use, was reduced in the rod-cone patients, however only when the controls were taken into account (p = 0.01). Conclusion: This is to our knowledge the first study which proposes the retinal vessel oximetry to be a sensitive measure for differentiating rod-cone dystrophy patients not only from controls, but also from patients with other inherited retinal dystrophies. Hintergrund: Evaluation der Sauerstoffsättigung bei Patienten mit hereditären Netzhauterkrankungen. Material und Methoden: Es wurden Fundusoxymetrieaufnahmen mittels eines RVA-Geräts (IMEDOS Systems UG, Jena, Germany) durchgeführt. Retinale Oxymetrie (RO) wurde bei Patienten mit hereditären Netzhauterkrankungen (n = 27, 53 Augen) durchgeführt und mit denen von Kontrollprobanden verglichen (n = 11, 22 Augen). Die Sauerstoffsättigung der arteriellen (A-SO2) und venösen (V-SO2) Gefäße sowie deren Differenz (A − V SO2) wurde ausgemessen und innerhalb der Gruppe und mit der Gruppe der Kontrollprobanden verglichen. Ergebnisse: Gemäß der V-SO2-Mittelwerte (± SD) konnten die Stäbchen-Zapfen-Dystrophien (66,46 %, SD ± 5,09) von der Kontrollgruppe (54,02 %, SD ± 3,04), von den Zapfen-Stäbchen-Dystrophien (57,56 %, SD ± 5,66) und von den hereditären Makulopathien (58,42 %, SD ± 4,74) differenziert werden. Die A-SO2 waren bei der Stäbchen-Zapfen-Dystrophie-Gruppe mit 98,96 % (SD ± 6,06, p < 0,014) im Vergleich zu den Kontrollprobanden mit 92,68 % (SD ± 3,53, p > 0,05) erhöht. Andererseits unterscheidet sich die A-SO2 der Zapfen-Stäbchen-Dystrophie-Gruppe mit 92,75 % (SD ± 3,75) und die der Makulopathiegruppe mit 94,44 % (SD ± 4,85) nicht von der der Kontrollgruppe. Einzig die A − V SO2-Differenz war in der Stäbchen-Zapfen-Dystrophie-Gruppe im Vergleich zur Kontrollgruppe reduziert (p = 0,01). Schlussfolgerung: Diese erste Studie zur Sauerstoffsättigung bei Patienten mit hereditären Netzhauterkrankungen zeigt, dass Stäbchen-Zapfen-Dystrophie-Patienten sich sowohl von der Kontrollgruppe als auch von anderen Patienten mit hereditären Netzhauterkrankungen unterscheiden lassen.

23 March 2015 in Acta Ophthalmologica
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LTLisette T. Lopez Torres
Lisette T. Lopez Torres
CTCengiz Türksever
Cengiz Türksever
ASAndreas Schötzau
Andreas Schötzau
SOSelim Orgül
Selim Orgül
MTMargarita G. Todorova
Margarita G. Todorova