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Yıl:2022; Cilt: 33; Sayı: 2>> Özet
TAM METİN
Türk Psikiyatri Dergisi; 2022;33(2):73-81
Sosyal Anksiyete Bozukluğu Olan Hastalarda Dinlenim Durumu İşlevsel Manyetik Rezonans Görüntüleme Bulgularının İncelenmesi
C Ergül, Ç Ulaşoğlu-Yıldız, E Kurt, A Kıçik, R Tükel
Bismil Devlet Hastanesi, Diyarbakır
Amaç: Sosyal anksiyete bozukluğunun (SAB) nörobiyolojik temeli ile ilgili en öne çıkan bilgiler, işlevsel manyetik rezonans görüntüleme çalışmalarında amigdala, insula, hipokampüs, dorsal anterior singulat korteks gibi korku devresi ve duygu düzenlenmesi ile ilgili bölgelerin aktivitesinde artış; prefrontal korteks aktivitesinde ise değişiklik olduğudur. Bu çalışmada SAB’si olanların dinlenim durumundaki beyin ağlarının işlevsel bağlantısallığının araştırılması amaçlanmıştır. Yöntem: İlaç kullanmayan 21 SAB tanılı hasta ile yaş, cinsiyet, eğitim durumuna göre eşleştirilmiş kontrol grubunu oluşturan 21 sağlıklı katılımcıdan dinlenim durumu işlevsel manyetik rezonans kayıtları alındı. Bağımsız bileşen analizi ile elde edilen dinlenim durumu ağları voksel tabanlı t-testi ile gruplar arasında karşılaştırıldı. Bulgular: SAB’si olanlarda sağlıklı kontrollere göre, dikkat çekerlik ağının anterior bileşeninin (sol orbitofrontal korteks) içrek işlevsel bağlantısallığında azalma, posterior bileşeninin (sol supramarginal girus) içrek işlevsel bağlantısallığında artış saptandı. Sonuç: SAB çalışmalarının çoğunda işlevsel bağlantısallık anksiyete uyandıran görevler sırasında tohum temelli analiz ile değerlendirilmiş, böylece korku devresi ve duygu düzenlenmesi ile ilgili bölgelere odaklanılmıştır. Bu çalışmada ise tüm beyinde bağımsız bileşen analizi yapılarak dikkat çekerlik ağının işlevsel bağlantısallığında bozulma saptanmıştır. Sonuçlarımız dikkat çekerlik ağının SAB’nin nörobiyolojisinde önemli bir rol oynadığını düşündürmektedir.
Evaluation of Resting-State Functional Magnetic Resonance Imaging Findings of Patients with Social Anxiety Disorder
Objective: The most prominent functional magnetic resonance imaging findings about social anxiety disorder are increased activity in emotional regulation areas (amygdala, insula, hippocampus, dorsal anterior cingulate cortex) and fear circuit, and altered activity in prefrontal cortex. This study aims to investigate network abnormalities during resting state. Method: Resting state functional magnetic resonance images of 21 drug-free patients with social anxiety disorder and 21 healthy controls (matched on age, gender, and years of education) were recorded. Resting state functional connectivity networks were obtained with independent component analysis, and were compared by using the voxel based t-test between the two groups. Results: Patients with social anxiety disorder displayed decreased intrinsic functional connectivity in the anterior component of the salience network (left orbitofrontal cortex) and increased intrinsic functional connectivity in the posterior component of the salience network (left supramarginal gyrus). Conclusion: Most of the studies about social anxiety disorder mainly focused on fear circuit and emotional regulation areas by using anxiety provoking tasks or by using seed based analysis of functional connectivity. By applying a whole-brain independent component analysis, we found altered functional connectivity in the salience network, but no significant difference was found in the fear circuit areas. Our results suggest that abnormal connectivity in the salience network might play a crucial role in the neurobiology of social anxiety disorder.

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