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Yıl:1999; Cilt: 36; Sayı: 3>> Özet
Nöropsikiyatri Arşivi; 1999;36(3):128-131
Akut düşük doz moklobemid'in sağlıklı gönüllülerde olaya ilişkin potansiyel yenilik (novelty) P300 bileşenine etkileri
N Ermutlu, T Demiralp, Y Üresin
Kadir Has Üniversitesi Fizyoloji Anabilim Dalı
Amaç: Sekiz sağlıklı gönüllüde geri dönüşlü mono-amin oksidaz inhibitörü (MAO) olan moklobemldin, olaya İlişkin potansiyel geç bileşeni olan yenilik (no­velty) P300'ü üzerine akut etkisi araştırıldı. Yöntem: Kayıtlar kontrol ve moklobemid (150 mg) alımından iki saat sonra olmak üzere ayrı günlerde alındı. Çevresel, hedef ve hedef olmayan seslerden oluşan oddball düzeneği kullanıldı. Deneklerden he­def olmayan ve çevresel sesler arasına rasgele yer­leştirilmiş hedef uyaranları (sesler) içlerinden say­maları istendi. Elektro-okülografi (EOG) ile göz hare­ketleri ve göz kırpmaları nedeniyle ortaya çıkan ar-tefaktlı dilimler off-line ve manuel olarak çıkartıldık­tan sonra yenilik P300 ünün en iyi görüldüğü fron­tal kanallar analiz edildi.
Bulgular: Moklobemid alımı ile yenilik P300 dalga genliği kontrol koşuluna göre anlamlı olarak yüksel­di.
Sonuç: Moklobemid kullanılan düşük dozda, muh­temelen noradrenerjik aktivite artışına bağlı olarak yeni olana dikkatin yönelmesini yansıtan yenilik P300 dalga genliğini yükseltmiştir. Noradrenerjik sistemin, patojenezine katkısı bulunduğu bozukluk­larda ve noradrenerjik sistemi etkileyen ilaçları kul­lanan hastaların izlenmesinde söz konusu girişimsel olmayan olaya-ilişkin potansiyel bileşeninin kulla­nılması yararlı olacaktır.
Effects Of Acute Low Dose Moclobemide On Novelty P300 Event Related Brain Potential Component In Healthy Volunteers
Object: Effects of acute administration of reversible monoamine oxidase inhibitor (MAO) moclobemide (150 mg p.o.) on novelty P300 component of late event-related potential were examined in eight he­althy volunteers.
Method: Records were taken one in the control con­dition and the other after two hours later than moc-lobemid intake on different days. Oddball paradigm was used which was consisted of target, non-target and .environmental sounds. The subjects were asked to count the targets silently which were (interspered) randomly among the non-target and environmental sounds. Artefacts due to eye movements and Win­kings were detected by electro-oculography (EOG). After off-line and manual elimination of those swe­eps, novelty P300 component was analysed in fron­tal channels where it is generally best visualized. Results: Moclobemide induced significant increase in novelty P300 amplitude whern compared with those in the control condition. Conclusion: After the acute intake of moclobemide, the finding of increased amplitude of novelty P300 component of event-related potential which reflects the reorienting of attention to novelty, suggests the probable role of noradrenaline due to the small do­se we used. Novelty P300, which is a component of non invasively obtained event related potentials, could be used in disorders where noradrenalin may have roles in their pathogenesis and in monitoring patients taking drugs with noradrenergic effects.

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