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Yıl:2016; Cilt: 53; Sayı: 4>> Özet
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Nöropsikiyatri Arşivi; 2016;53(4):321-327
Dikkat Eksikliği Hiperaktivite Bozukluğu Olan Erkek Çocuklarda Bakır ve Serüloplazminin İşitsel Uyarılmış Potansiyeller Üzerinde Olası Etkileri
Ö Yorbık, C Mutlu, MF Özdağ, A Olgun, G Eryılmaz, S Ayta
Maltepe Üniversitesi, İstanbul
Introduction: The aims of the present study were to investigate the relationship between levels of plasma copper (Cu) and ceruloplasmin (Cp) and amplitudes and latencies of P1, N2, and P3 in the parietal and frontal areas of children with attention deficit hyperactivity disorder (ADHD) as well as to compare these Cu levels and event-related potentials (ERPs) indices in controls. Methods: Boys (n=41) with ADHD were divided into two subgroups according to a median split of plasma Cu and Cp levels, separately. ERP indices from the parietal and frontal regions were recorded in children with ADHD and 24 normal boys (control group) using an auditory oddball paradigm. Results: Parietal P3 latency was significantly longer, and parietal P3 amplitude, frontal P3 amplitude, and frontal N2 amplitudes were smaller in children with ADHD than in controls (all p values <0.017). Parietal P1 and frontal P1 latencies were significantly shorter in the higher Cu group than in the lower Cu group (both p values <0.017). Decreased latency of parietal P1 was dependent on plasma levels of Cu (p<0.05). Frontal N2 and parietal N2 amplitudes were significantly lower in the ADHD group with lower Cp levels than in the ADHD group with higher Cp levels (both p values <0.017). Decreased frontal N2 and parietal N2 amplitudes were dependent on plasma levels of Cp (both p values <0.05). Conclusion: Plasma Cu and Cp levels may have an effect on ERPs in ADHD, thus indicating the existence of effects on information processing. Cu levels may have a negative effect on the neuronal encoding of sound, whereas Cp levels may have a positive effect on the processes of cognitive control, conflict monitoring, and stimulus discrimination in children with ADHD.
Possible Effects of Copper and Ceruloplasmin Levels on Auditory EventPotentials in Boys with Attention Deficit Hyperactivity Disorder
Amaç: Bu çalismanin amaçlari, dikkat eksikligi hiperaktivite bozuklugu (DEHB) olan çocuklarda parietal ve frontal bölgelerde P1, N2 ve P3 amplitüd ve latanslari ile plazma bakir (Cu) ve serüloplazmin (Cp) düzeyleri arasindaki iliskiyi incelemekti. Ayrica, kontrollerdeki bu Cu düzeyleri ve olay-iliskili potansiyel (OIP) endekslerini karsilastirmak amaçlandi. Yöntem: DEHB olan erkekler (n=41), plazma Cu ve Cp düzeylerinin ortanca degerine göre iki alt gruba ayri ayri bölündü. Parietal ve frontal bölgelerden OIP endeksleri, isitsel bir oddball paradigmasi kullanilarak DEHB olan çocuklarda ve 24 normal erkek çocukta (kontrol grubu) kaydedildi. Sonuçlar: DEHB olan çocuklarda kontrollere göre parietal P3 latansi anlamli olarak daha uzun, ve parietal P3 amplitüdü, frontal P3 amplitü- dü ve frontal N2 amplitüdü daha küçük idi (tüm p degerleri <0,017). Daha düsük Cu grubuna göre, daha yüksek Cu grubunda parietal P1 latansi ve frontal P1 latansi anlamli olarak daha kisa idi (her iki p degeri <0,017). Azalmis parietal P1 latansi, plazma Cu düzeyine bagimli idi (p<0,05). Daha yüksek Cp alt grubu ile karsilastirildiginda, daha dü- sük Cp düzeyi olan ADHD grubunda frontal N2 amplitüdü ve parietal N2 amplitüdü anlamli olarak daha düsük idi (her iki p degeri <0,017). Azalmis frontal N2 amplitüdü ve parietal N2 amplitüdü plazma Cp düzeyine bagimli idi (her iki p degeri <0,05). Sonuç: Plazma Cu ve Cp düzeylerinin, bilgi islemleme üzerindeki etkilere isaret ederek DEHB’de OIP’ler üzerinde etkisi olabilir. DEHB’i çocuklarda, Cp düzeylerinin bilissel kontrol, çatisma izlemi ve uyarani ayirt etme süreçlerinde olumlu etkisi olabilirken, Cu düzeylerinin sesin nöronal kodlamasi üzerinde olumsuz bir etkisi olabilir.

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