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Yıl:2011; Cilt: 22; Sayı: 4>> Özet
TAM METİN
Türk Psikiyatri Dergisi; 2011;22(4):213-221
Şizofreni Hastalarında Beyin Yarıküreleri Arasındaki Bozulmuş Bağlantı Bütünlüğü: Bir Diffüzyon Görüntüleme Çalışması
Ö Kitiş, Ç Eker, B Zengin, DA Akyılmaz, D Yalvaç, Hİ Özdemir, Dİ Haznedaroğlu, MM Bilgi, AS Gönül
Ege Üniv. Tıp Fak., İzmir
Amaç: Şizofrenide iki beyin yarıküresi arasındaki iletişimin bozukluğuna
işaret eden pek çok veri olmasına rağmen, iletişim bozukluğu anatomik
açıdan net olarak gösterilememiştir. Bu çalışmada difüzyon tensor
görüntüleme (DTG) yöntemi kullanılarak iki yarıküreyi birbirine bağlayan
temel yol olan korpus kallosumun yapısal bütünlüğü ve bu bütünlüğü
etkileyen değişkenler araştırılmıştır.
Yöntem: Çalışmaya katılan gönüllülerin tanıları SCID-1 ile değerlendirilmiş
ve hastaların belirti düzeyleri PANSS ile belirlenmiştir. Çalışmaya
katılan 25 şizofreni hastası ile 17 sağlıklı gönüllünün DT görüntüleri
1,5 Tesla gücündeki MR cihazı ile alınmıştır. İki grubun, DT görüntülerinden
elde edilen fraksiyonel anizotropi (FA) değerleri karşılaştırılmıştır.
Bulgular: Hastaların genu bölgelerindeki fraksiyone anizotropi (FA)
değerlerinin kontrollerden düşük olduğu; spleniumda ise iki grup arasında
fark olmadığı saptanmıştır. Ayrıca, splenium FA değerleri ile antipsikotik
ilaç dozları arasında eksi yönde anlamlı ilişki saptanırken;
PANSS skorları için bu ilişki eğilim düzeyinde kalmıştır.
Sonuç: Korpus kallosumun genu bölgesi her iki frontal lobu birbirine
bağlayan en önemli yapıdır. Bu çalışmanın sonuçları ile şizofreni patogenezinde
frontal lobların iletişim bozukluğunu temel alan yaklaşıma koşut
bir kanıt daha elde edilmiştir.
The Disrupted Connection Between Cerebral Hemispheres in Schizophrenia Patients: A Diffusion Tensor Imaging Study
Aim: In schizophrenia, the disruption of the communication between
two brain hemispheres has not been shown clearly in the anatomical
aspect despite other studies with different modalities suggested so. In this
study, the structural integrity and the variables affecting the structural
integrity of the corpus callosum, which is the main connection between
two hemispheres, was investigated via diffusion tensor imaging (DTI).
Methods: The participants were evaluated by SCID-I and symptoms of
the patients were assessed with PANSS. DT images of 25 schizophrenia
patients and 17 healthy volunteers were acquired via 1.5 T MR.
Fractioned Anisotropy (FA) values of two groups, measured on the DT
images, were compared.
Results: It was found that fractioned anisotropy (FA) values were lower
in the genu of the patients than the healthy controls; however, there was
no difference between the FA values of the patients and the controls in
the splenium. Moreover, a significant negative correlation between the
splenium FA values and the antipsychotic medication doses; and a trend
level negative correlation of splenium FA and PANSS scores were found.
Conclusion: Corpus callosum is the most important structure that
connects two frontal lobes. The hypothesis that posits the fundamental
role of the disconnection of frontal lobes in schizophrenia is supported
by the findings of this study.

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