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Yıl:2020; Cilt: 57; Sayı: 2>> Özet
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Nöropsikiyatri Arşivi; 2020;57(2):108-112
Fotosensitif İdiopatik Generalize Epilepsi Hastalarında Vizüel Habitüasyon Defisiti
Dİ Algın, OO Erdinç
Osmangazi University , Eskişehir
Amaç: Bu çalışmada, ışığa duyarlılığı olan ve olmayan idiyopatik generalize epilepsili (IGE) hastalarda kortikal eksitabilite düzeylerini araştırmayı amaçladık. Yöntem: Çalışmaya IGE’li 42 hasta (26 kadın ve 16 erkek, ortalama 30±8 yaş; 18–43 yıl) ve yaşları uyumlu 35 sağlıklı kontrol (15 kadın ve 15 erkek, ortalama yaş 35±3 yıl; 20–45) alındı. Hastaların 18’i fotosensitif IGE (IGE+PS) ve 24’ü non-fotosensitif (IGE-PS) olarak iki grupta değerlendirildi. Patern reversal vizüel evok potansiyel (PR-VEP) tetkiki ile N75-P100 ve P100-N145 inter-pik amplitüdleri ve N75, P100, N145 latansı, 100 yanıt alınarak altı kez ölçüldü. Habituasyonu değerlendirmek için N75-P100 ve P100-N145 pik amplitüdleri lineer regresyon çizgisi eğimi kullanıldı. Bulgular: Üç grup arasında IGE+PS grubunda N75-P100 amplitüdü IGEPS ve kontrollere göre yalnızca ilk blokta düşük amplitüde sahip olup istatiksel olarak anlamlıydı. IGE+PS grubunda, antiepileptik tedavi alan olgularda N75-P100 amplitüdü, anti-epileptik tedavi almayanlara göre anlamlı derecede düşüktü (p=0,035). Sonuç: Bulgularımız IGE+PS hastalarında farklı fotoparoksismal yanıt (PPR) fenotiplerinin IGE’de farklı patofizyolojik mekanizmalarla desteklenebileceğini düşündürmektedir. Aktivasyon öncesi kortikal eksitabilite IGE+PS hastalarına IGE-PS’den veya sağlıklı gönüllülerden daha yüksek olabilir. PR-VEP habitüasyonu, ışığa duyarlılığın altında patofizyolojik mekanizmaları yansıtabilir ve IGE+PS’li hastalarda potansiyel biyomarker olabilir.
Impaired Visual Habituation in Idiopathic Generalized Epilepsy with Photosensitivity Patients
Introduction: In this study, our goal was to analyze further the cortical excitability levels in idiopathic generalized epilepsy (IGE) patients with and without photosensitivity. Methods: Forty-two patients (16 men and 26 women; mean age 30±8 years; range: 18–43 years) with IGE and thirty healthy age-matched control subjects (15 men and 15 women; mean age 35±3 years; range: 20–45 years) were enrolled for the investigation. We investigated the following two groups: 18 subjects with IGE with photosensitivity (IGE+PS), and 24 patients with IGE without photosensitivity (IGE-PS). Pattern reversal and potential inter-peak amplitudes, N75-P100 and P100-N145, as well as the corresponding latencies (N75, P100, and N145) for one hundred responses were measured 6 times. A linear regression slope was used for N75-P100 and P100-N145. Results: Statistical analysis showed difference between groups where the IGE+PS had reduced N75-P100 compared to IGE-PS and controls. In IGE+PS group, the amplitude of N75-P100 was drastically reduced receiving antiepileptic therapy compared to those not receiving any anti-epileptic treatment (p=0.035). Conclusion: These results show that the IGE+PS group has a different photoparoxysmal response phenotype driven by an unknown and distinct molecular mechanism. Pre-activation cortical excitability may be increased in IGE+PS patients compared to the IGE-PS or in healthy group. PR-VEP habituation may project the pathophysiological mechanisms underlying photosensitivity and it may be potential biomarker in patients with IGE+PS.

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