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Yıl:2008; Cilt: 19; Sayı: 1>> Özet
TAM METİN
Türk Psikiyatri Dergisi; 2008;19(1):13-18
Obsesif Kompulsif Bozukluk ve Dikkat Eksikliği Hiperaktivite Bozukluğu Olan Çocukların Serebral Kan Akımlarının Karşılaştırılması
P Öner, Ö Öner, A Aysev, Ö Küçük, E İbiş
Atatürk Eğitim ve Araştırma Hastanesi, Çocuk Psikiyatri Bl
Amaç: Hem obsesif kompulsif bozukluk (OKB) hem de dikkat eksikliği hiperaktivite bozukluğunun (DEHB) frontalstriatal
beyin döngülerindeki değişiklikler ile ilişkili olduğu bildirilmiştir. Ayrıca bu bozukluklar sıklıkla da eşhastalanım
göstermektedir. Buna karşın, bu iki bozukluktaki nörobiyolojik bulguları doğrudan karşılaştıran çalışma
bulunmamaktadır. Bu çalışmanın amacı OKB ya da DEHB olan olgularla tek foton bilgisayarlı emisyon tomografisi
(SPECT) ile kortikal kan akımının ölçümüdür.
Yöntem: 13 ilaç kullanmamış OKB olgusu (ortalama yaş ± SD= 10.4 ± 2.8) ve 13 ilaç kullanmamış DEHB olgusu
(yaş 10.5 ± 2.2) çalışmaya dahil edilmiştir. Beyin kan akımı (BKA) tüm olgularda istirahat koşullarında Tc-99mhekzamethilpropileneamin
oksim (Tc99m HMPAO) beyin SPECT ile ölçülmüştür. Bonferroni düzeltmesi ile anlamlılık
p<.006 olarak saptanmıştır.
Bulgular: OKB olgularının sağ prefrontal (p=.003) BKA değerleri DEHB olgularından anlamlı derecede yüksektir.
Diğer beyin bölgelerindeki ölçümlerde farklılık saptanmamıştır. OKB belirtilerinin şiddeti ile BKA arasında ilişki
bulunmamıştır.
Tartışma: Çocuk ve ergen OKB olgularının doğrudan incelendiği çok az sayıdaki çalışmadan birisi olan bu çalışmada
sonuçlar OKB olgularında prefrontal kortekste kan akımında artış olduğunu bildiren önceki çalışmalarla
uyumludur. DEHB olgularında da, önceki literatürle uyumlu olarak, aynı bölgede kan akımında azalma saptanmıştır.
Bu iki bozukluğun patofizyolojisi daha iyi anlaşılabilmesi için her iki bozukluğun bir arada ve tek başına olduğu
durumların karşılaştırıldığı çalışmalar gereklidir.
Comparison of Cerebral Blood Flow in Children with Obsessive Compulsive Disorder and AttentionDeficit Hyperactivity Disorder
Objective: It has been reported that both obsessive-compulsive disorder (OCD) and attention deficit hyperactivity
disorder (ADHD) might be related to impairments in frontal-striatal brain circuits. Besides, these two disorders are
frequently comorbid. However, there are no published studies directly comparing the neurobiological findings in
these two disorders. The objective of the study was to investigate the differences in cortical blood flow between
patients with OCD and ADHD.
Method: Thirteen drug-naive OCD subjects (mean age ± SD: 10.4 ± 2.8), and 13 drug-naive ADHD subjects
(mean age ± SD: 10.5 ± 2.2) were included in the study. Cerebral blood flow (CBF) was evaluated with Tc-99mhexamethylpropyleneamine
oxime (Tc99m HMPAO) brain single photon emission tomography (SPECT) during
standard resting conditions in all cases. P value was set to <.006 after Bonferroni correction.
Results: OCD cases had significantly higher right prefrontal (p=.003) CBF than ADHD cases. There were no
significant CBF differences in other brain regions. OCD symptom severity was not related to CBF.
Discussion: This is one of the very few studies which directly investigated brain imaging in pediatric OCD subjects.
Results are consistent with previous studies reporting increased prefrontal CBF in OCD subjects. We also found
that, consistent with the previous literature, ADHD subjects had lower prefrontal cortex CBF. Studies which
compare subjects with comorbid ADHD and OCD with pure forms of these disorders are necessary to have a better
understanding of similarities and differences of these two disorders.

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